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This months Bike magazine

<div class='quotetop'>QUOTE (basspete @ Feb 6 2008, 08:40 AM) <{POST_SNAPBACK}><div class='quotemain'>So yeah, we will wait and see how 2008 pans out, like yorself, Ive been following it a long time, and look forward to any new season, as long as we get a good yeras racing, I dont really care if a Japanese/Spanish hybrid robot munchkin who cannot overtake wins, an Aussie on a remote (traction) controlled bike wins, or an Italian god like genius wins the title at the end of it.
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It's all racing, isnt it?

Pete
I am with you on the electronics argument, and I reiterate that stoner himself has said he preferred the 990s. I also agree with oxley that bike racing is being ruined by the people in charge who do not understand it.

I do find it ironic that the salvation of 2-strokes is an aussie invention
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, not that I would suggest all you rossiphiles have not been given very good cause by him for being fans of his. The actual orbital engine itself of course never got off the ground.
 
nice one pete 'n' sarto...

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read every "rossi-centric" word and it makes perfect sense to me, 2-strokes were killed before the technology could catch up and that is why i will never forgive honda or the fatcats who decided to go the 4T way.

if 2T engines were still around the motogp paddock today, i have no doubt that there would be all manner of electrikery under the fairings and they would be much more civil than ever, but there would still be a lot of teams able to compete without going to the wall every year to find sponsorship..



p.s. still cant find reference to rossi in the article. can you barry?

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<div class='quotetop'>QUOTE (BigAl @ Feb 6 2008, 01:19 PM) <{POST_SNAPBACK}><div class='quotemain'>read every "rossi-centric" word and it makes perfect sense to me, 2-strokes were killed before the technology could catch up and that is why i will never forgive honda or the fatcats who decided to go the 4T way.

I thought 2-strokes were killed because the technology was becoming too advanced and the 2-strokes had been around for ages and reached the height of their development.
 
thanks for the article
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the desecration of motorcycle racing is underway by people with no vision


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dam must have been reading this forum sums up barry to a T.
 
<div class='quotetop'>QUOTE (sarto @ Feb 6 2008, 11:00 AM) <{POST_SNAPBACK}><div class='quotemain'>Okay, I have just got this after some delays caused by all sorts of technical problems that always occur when you least want them to.
I have had to convert the file to jpeg to host on flickr, so it comes in at a bit under 1MB.
Therefore I will post a link, in case anyone has a slow connection.

http://farm3.static.flickr.com/2034/224641...f2649f137_b.jpg

Haven't even read it myself yet as I posted it as soon as I found I had it.

Let me know if there are any problems.


Cheers

Thanks for postin that Sarto, be interesting to see the comments now folk can read it.
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Pete
 
<div class='quotetop'>QUOTE (BigAl @ Feb 7 2008, 12:19 AM) <{POST_SNAPBACK}><div class='quotemain'>p.s. still cant find reference to rossi in the article. can you barry?

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NO I can't, not any direct reference .... but thats hardly surprising is it .... especially since as I have said right from the beginning that
<div class='quotetop'>QUOTE (BarryMachine @ Feb 4 2008, 02:56 PM) <{POST_SNAPBACK}><div class='quotemain'>Is that the same Mat Oxley who ghost writes Rossi's magazine article for him?? Boy thats bound to be an unbiased read that will be so devoid of spin I will just have to believe everyword
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So I was alluding to Mat Oxley being a "spin doctor"


ok I bothered to read the article ..... since you all insist
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and yes straight away the "spin" starts"

1st paragraph

The "racing is getting boring" line is used .... yes he said its we who are worried about it .... but then says at the end "I can see why" ..... where did the "the racing is getting boring" line come from?
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He then starts on TC
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and how 250's could become the "real fans" ( connoiseurs ) class.


Then theres a lot of "odd" stuff there .... eg.

according to the article follk apparently got bored before, with the 500's, at the time of the MV domination ........
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....... gee who remembers who won on those MV's? ......... who remembers who was in the 250's? ......
so if you do remember Agostini and Hailwood .... makes a bit of a mockery of what he is saying doesn't it?.

And the DI two strokes ....... well they do have a benefit ...... in that a short pulse of air fuel can be sent into the combustion chamber whilst the exhaust port is closed .... and such a small amount fed in that it can be metred to be of a quantity that burns allmost entirely before the exhaust port re-opens ( hence no wasted unburnt gases ) ..... but thats great for making a low power fuel efficient engine. But for real high performance 2 strokes .... to get more power out you have to start raizing quantities of fuel/air put in ...... this translates to a longer time of charging ..... as soon as this charging time goes so long as the exhaust port is opening then it has no benefit over a relatively conventional two stroke ... ..... conventional two strokes have to oversaturate the supply of air/fuel to get the most out of them. The whole reason "the expansion chamber" worked was that it is a device that sonically "bats" the escaping wadted charge back into the combustion chamber .... So to get real high power you would just be using the DI gear to pump huge amounts into the combustion chamber. So why tack on extra gear for that?? A conventional two stroke already has a good pump for large amounts ( the crankcase ) ...... So sadly DI has little benefit in motogp .... but is operable if trying to meter just the right smal amount of air/fuel. So that bit of the article is misleading. Sadly their is no such thing as a high power and fuel efficient 2 stroke, you can have either but you can't have both. Hence why 4 strokes are taking over worldwide.
Hence why motogp thought it wize to follow suit.

Also on the the orbital DI system, to put it into perspective, it has been around since before the internet ...... if it was so great .... why hasn't it taken off?


So .....

if you don't think motogp is boring then the article becomes just more of the same old stuff we heard from the Rossi fans about how boring it was getting because Stoner would not slow down and fight like a man
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if you don't think TC is making it unfair for the "real riders" ...... then the article is just more of the spin to that effect, that we heard from the Rossi fans .... many of whom claimed Rossi had never had a drop of TC in his life
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( but thats ok I figured out why they think that ..... see Rossi never actually touches the ground as he is god hence TC would be useless for him
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) I think some out there even think TC was first used by Stoner and only in 07, or some even say he uses the "most TC"
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But I believe TC has been there for for quite a few years now and all riders have it in one form or another ... and they all must set it up to suit themselves in order to optimise their performance. Its a pretty level playing field in that they all do have it .... but it is also a good development media as they all are competitive with creating a system and setup that most optimises their performance. In all honesty I don't really care if TC is removed if it is a "level playing field" ..... but I do think that it does have some development benefits so I would rather it was explored a bit further at present.

Anyhow it seems you sucked me in
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... well done !! you got me to read it
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but it was just more of the same ......
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The other article was all about the poor old Yamaha, and the tyres, .... this article was about the "boring racing" and the TC .......... now where have I heard all that before
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No more Oxley ..... I'm done with it
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<div class='quotetop'>QUOTE (BarryMachine @ Feb 6 2008, 03:18 PM) <{POST_SNAPBACK}><div class='quotemain'>NO I can't, not any direct reference .... but thats hardly surprising is it .... especially since as I have said right from the beginning that


So I was alluding to Mat Oxley being a "spin doctor"


ok I bothered to read the article ..... since you all insist
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and yes straight away the "spin" starts"

1st paragraph

The "racing is getting boring" line is used .... yes he said its we who are worried about it .... but then says at the end "I can see why" ..... where did the "the racing is getting boring" line come from?
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He then starts on TC
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and how 250's could become the "real fans" ( connoiseurs ) class.


Then theres a lot of "odd" stuff there .... eg.

according to the article follk apparently got bored before, with the 500's, at the time of the MV domination ........
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....... gee who remembers who won on those MV's? ......... who remembers who was in the 250's? ......
so if you do remember Agostini and Hailwood .... makes a bit of a mockery of what he is saying doesn't it?.

And the DI two strokes ....... well they do have a benefit ...... in that a short pulse of air fuel can be sent into the combustion chamber whilst the exhaust port is closed .... and such a small amount fed in that it can be metred to be of a quantity that burns allmost entirely before the exhaust port re-opens ( hence no wasted unburnt gases ) ..... but thats great for making a low power fuel efficient engine. But for real high performance 2 strokes .... to get more power out you have to start raizing quantities of fuel/air put in ...... this translates to a longer time of charging ..... as soon as this charging time goes so long as the exhaust port is opening then it has no benefit over a relatively conventional two stroke ... ..... conventional two strokes have to oversaturate the supply of air/fuel to get the most out of them. The whole reason "the expansion chamber" worked was that it is a device that sonically "bats" the escaping wadted charge back into the combustion chamber .... So to get real high power you would just be using the DI gear to pump huge amounts into the combustion chamber. So why tack on extra gear for that?? A conventional two stroke already has a good pump for large amounts ( the crankcase ) ...... So sadly DI has little benefit in motogp .... but is operable if trying to meter just the right smal amount of air/fuel. So that bit of the article is misleading. Sadly their is no such thing as a high power and fuel efficient 2 stroke, you can have either but you can't have both. Hence why 4 strokes are taking over worldwide.
Hence why motogp thought it wize to follow suit.

Also on the the orbital DI system, to put it into perspective, it has been around since before the internet ...... if it was so great .... why hasn't it taken off?


So .....

if you don't think motogp is boring then the article becomes just more of the same old stuff we heard from the Rossi fans about how boring it was getting because Stoner would not slow down and fight like a man
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if you don't think TC is making it unfair for the "real riders" ...... then the article is just more of the spin to that effect, that we heard from the Rossi fans .... many of whom claimed Rossi had never had a drop of TC in his life
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( but thats ok I figured out why they think that ..... see Rossi never actually touches the ground as he is god hence TC would be useless for him
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) I think some out there even think TC was first used by Stoner and only in 07, or some even say he uses the "most TC"
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But I believe TC has been there for for quite a few years now and all riders have it in one form or another ... and they all must set it up to suit themselves in order to optimise their performance. Its a pretty level playing field in that they all do have it .... but it is also a good development media as they all are competitive with creating a system and setup that most optimises their performance. In all honesty I don't really care if TC is removed if it is a "level playing field" ..... but I do think that it does have some development benefits so I would rather it was explored a bit further at present.

Anyhow it seems you sucked me in
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... well done !! you got me to read it
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but it was just more of the same ......
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The other article was all about the poor old Yamaha, and the tyres, .... this article was about the "boring racing" and the TC .......... now where have I heard all that before
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No more Oxley ..... I'm done with it
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Jeez, are you the most paranoid guy on here or what, nobody else is giving Stoner or Rossi a thought on this thread. But of course were all just fanboys looking for an excuse.....Actually are you Alphabet? Did your caps lock break? Are you Toni Elias? Coz they are the only other folk who could uncover the pro Rossi anti whoever stuff in any post that didnt say "I want to be the mother of (insert this weeks favourite rider's name here) babies.

Sorry pal weve seen all this stuff before. I'ts not big or clever. It's boring.

Pete
 
Thanks with extra Castrol R to basspete and sarto.

Very interesting read, especially about what happened to the old Orbital 2-stoke. Apparently DI 2-strokes are also making it in the marine environment with higher power than the equivalent cc 4 stroke (no ....) but also cleaner emissions and better fuel economy being claimed.

As far as I understand, Honda always hated the stinkwheel and was the manufacturer most instrumental in getting rid of them. I knew that the costs had spiralled since 2002, but didn't realise how much. I wonder why it's costing so much more with 4-strokes - I know they had pretty much stopped development of the 2-stroke towards the end, but still....

On the "replace 250 strokers with 400 4s" front, when both were available new, what type of people chose the 250 strokers over the 400 4s? Or, to put it another way, of the buyers of both types, which were the egotistical risk takers? I agree that a huge proportion of those egotistical risk takers are arseholes, but a small proportion are also bloody good racers.
 
<div class='quotetop'>QUOTE (yamaka46 @ Feb 8 2008, 01:30 AM) <{POST_SNAPBACK}><div class='quotemain'>Very interesting read, especially about what happened to the old Orbital 2-stoke. Apparently DI 2-strokes are also making it in the marine environment with higher power than the equivalent cc 4 stroke (no ....) but also cleaner emissions and better fuel economy being claimed.

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go on show the folks the figures
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So a 400cc marine 2 stroke has higher power than a 400cc 4 stroke ...... thats a pretty dismal thing to claim are you aware
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But to get that power out of a DI marine unit ... show us the fuel figures
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<div class='quotetop'>QUOTE (BarryMachine @ Feb 7 2008, 03:58 PM) <{POST_SNAPBACK}><div class='quotemain'>
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go on show the folks the figures
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....... Google it you lazy slack arse
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<div class='quotetop'>QUOTE (BarryMachine @ Feb 7 2008, 03:58 PM) <{POST_SNAPBACK}><div class='quotemain'>So a 400cc marine 2 stroke has higher power than a 400cc 4 stroke ...... thats a pretty dismal thing to claim are you aware
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hence the "no ...." comment - can't you read unless it's about Stoner being better than Rossi
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<div class='quotetop'>QUOTE (BarryMachine @ Feb 7 2008, 03:58 PM) <{POST_SNAPBACK}><div class='quotemain'>But to get that power out of a DI marine unit ... show us the fuel figures
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What power? No power or fuel figures provided - see your first point.

As I know you won't Google it 'cos it doesn't make Stoner look good or Rossi look bad - here's a link
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Nissan Marine
 
From your link:

"How good is the fuel economy of a TLDI® motor?

With the TLDI® system you achieve a dramatic increase in fuel economy over conventional 2-strokes. The TLDI® system will even provide better fuel economy than a comparable 4-stroke while at trolling and cruising speeds."

thats from your link to the Nissan site .... though I note its not an orbital DI system
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Nonethelss the Nissan site says it all .... works economically for low power, as I said.

I assume the fact that the say just trolling and cruising speeds means when you ask for performance ..... you don't get the economy ..... as I also said and as allways has been understood was the downfall of any Di 2 stroke especially piston ported engines.

Its 2 stroke DI its allways had that problem ..... lots of big ship diesels are DI 2 strokes they work great in plodding on for days on end at good economy

but you never see ships doing wheelies or donuts do you !!
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Have a look on the Orbital site ..... have a look at the animated DI engine .... very very low exhaust port ....... do you know what that means? ..... well thats for "plonker" engines ..... high performance 2 strokes tend to have the exhaust port higher up ..... so you get a catch 22 situation .... not much time to inject enough ( or a well enough timed pulse ) air fuel. So again the DI claim for resurrecting two strokes is a misnoma ..... its spin.

Sadly for 2 strokes too ... when the guy said "we have reached as far as two strokes are going to go" .... this was well known as correct for high performance. There had been years matching the ultimate porting with pipes etc. etc. etc. But one thing was for sure to get performance you blow a bit of gas out the pipe ..... chambers are tuned at a fixed length ... so the gas gets batted back in at a fairly specific RPM .... but not as effectively at any revs away from that hence a rather "bumpy" power delivery of 2 strokes and poor fuel economy away from that power peak. Even very "overlappy" 4 strokes don't waste the fuel a high performance 2 stroke does ...... take off the chamber and they are pathetic in that respect.
 
<div class='quotetop'>QUOTE (BarryMachine @ Feb 7 2008, 04:03 PM) <{POST_SNAPBACK}><div class='quotemain'>blah blah blah
My original point about Marine DI was not about Orbital - two separate sentences if you look. My point was that 2-strokes are selling in the marine environment and they are.

My point had .... all to do with whether they are viable as road/racing bike engines, though IMO if I could get hold of another RG500 (had one in the late 90s and stupidly sold it) I'd do it just for the buzz. No, not the fastest in comparison to an R1 or similar, but stinkwheels were great.
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Only way you could come up with all that tosh about "bumpy power delivery" is if you've never ridden a large cap 2-stroke:lol:
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<div class='quotetop'>QUOTE (yamaka46 @ Feb 8 2008, 03:56 AM) <{POST_SNAPBACK}><div class='quotemain'>Only way you could come up with all that tosh about "bumpy power delivery" is if you've never ridden a large cap 2-stroke:lol:
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haha now you are calling one of the most basic principles in two strokes and their power delivery "tosh"

you are a fruitcake!!


so you think large capacity two strokes had nice smooth power??

Crikey!! my experience with any highly tuned large capacity two stroke was that they hit like a truck!!

You'd be the first to claim they were smooth!! ... but hang on what does "bumpy" mean to you ?... probably your favourite teddy bears name is it
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What a joker!! I've been arguing with a lump of wood here ....no wonder you can't understand a thing I say. Two strokes have smooth power deliver pfft! your a fruitcake mate!

You've just been pulling my leg haven't you! ... what just for the sake of argument is it??
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<div class='quotetop'>QUOTE (BarryMachine @ Feb 7 2008, 05:14 PM) <{POST_SNAPBACK}><div class='quotemain'>haha now you are calling one of the most basic principles in two strokes and their power delivery "tosh"

you are a fruitcake!!


so you think large capacity two strokes had nice smooth power??

Crikey!! my experience with any highly tuned large capacity two stroke was that they hit like a truck!!

You'd be the first to claim they were smooth!! ... but hang on what does "bumpy" mean to you ?... probably your favourite teddy bears name is it
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What a joker!! I've been arguing with a lump of wood here ....no wonder you can't understand a thing I say. Two strokes have smooth power deliver pfft! your a fruitcake mate!
Never said they had smooth power. More like no power.... no power... .... get that front wheel down... warp speed Mister Sulu... power dropping off... change gear.... repeat previous 6 stages.

So, I guess, if you include the gear changes it is indeed bumpy. But the power delivery was "peaky", ie nothing except in one narrow rpm band.

Bumpy implies (to me) several peaks as the power increases with the rpm.
 
<div class='quotetop'>QUOTE (yamaka46 @ Feb 8 2008, 04:22 AM) <{POST_SNAPBACK}><div class='quotemain'>Never said they had smooth power. More like no power.... no power... .... get that front wheel down... warp speed Mister Sulu... power dropping off... change gear.... repeat previous 6 stages.

So, I guess, if you include the gear changes it is indeed bumpy. But the power delivery was "peaky", ie nothing except in one narrow rpm band.

Bumpy implies (to me) several peaks as the power increases with the rpm.

well thats a better post!! at least I can tell straight up what words I used wrong for you!!


and yes some were indeed tuned "bumpy" ( as in a few cusps on the power curve ) not just peaky. This could be achieved on multicylinder two strokes by tuning each pot and pipe to be most effective at differing rpms to the next pot ...but they still tend to be "bumpy" ... I refrained from using peaky because many folk misinterpret that to mean the "peak revs" as opposed to the "peak" in the power curve ( I'am therefore pleased to see you used the word peaky as I thought you wouldn't know what the hell I was talking about ) .

All that aside the best thing that has ever happened to 2 strokes has already happened when expansion chambers were figured out .... Di means bugger all and is really just very old technology being revisited. Its not much different to what old hot bulb diesels ran. Anyway Orbital have all but dropped it too I think and seem to be chasing 4 stroke multi fuel technologies now.
 
<div class='quotetop'>QUOTE (roger-m @ Feb 8 2008, 10:47 AM) <{POST_SNAPBACK}><div class='quotemain'>
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you said it, but we were all thinking it
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more on "confused sexuality" from the two guys who most want to be Uccio
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