800's vs 990's

lHave a read of this link to get the principles of Hondas Active Radical
engine.

http://www.motorcycle.com/mo/mchonda/exp2_tech.html

Ok, this doesnt quite match a 4 stroke on emisions, but surely, there
is more to being environmentally sound than one area?

I have always found it a bit bizzare that it was the US who turned
against 2 strokes in the 70s, while being one of the worlds largest
industrial polluters and having an active space programme. That surely
isnt good for the environment, never mind the huge cars that are used
everywhere!

Its quite telling that the EXP2 had almost equal performance to the NXR
820, with less than half the capacity. And the NXRs were made to win the
Dakar, not to test new environmentally sound technology.


The other thing I dont like about the abandonment of 2 strokes is, the
new high performance high revving fourstrokes used in motocross. Any of
the guys I know with crossers have told me horror stories of expensive
mechanical failures happenning regularly. So to make a motocrosser
capable of beating a 2 stroke they have to be not only twice the
capacity, but they appear to be in a pretty fragile state of tune.

I know running any race bike is an expense, but, with less parts to go
wrong, and modern 2 stroke oils, a 2 stroke appears to me to be the
favourable option.

Oh yeah, and if the EXP2 aint enough, Honda also used the technology in
the CRM250 AR. Widely reckoned to be one of the best trail bikes ever.

The Australian built Orbital engine was another example of an efficient 2 stroke engine, they used it in a Ford fiesta, but thats all I know about it.

Ducati built there sales on WSK success which is a production based discipline, and have only been in GP for a short time and as yet dont have a road going four cylinder.

Ferrari is a different thing all together, they have always been a builder of niche sports cars, and are hardly the most common thing on the road.

I stand by what I say, GP and F1 are prototype based racing, and the vehicles bear no resemblence to road going vehicles of the same name.

Pete

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^^im with you pete. i think strokers rock,i also think they will return in the future, one of the advantages ofa 2 stroke against a 4 stroke is the lack of internal friction the downside is the porting,in the old days they used a shnuls loop to lession the effect of the intake and exaust ports being open at the same time.
direct injection tecknolagy does excist to make an efficiant 2 stroke but there just out of fashion at the moment.

I found this link on two strokes, interesting:
http://www.motorcycledaily.com/02may01twostrokemystery.html

<div class='quotetop'>QUOTE (roger-m @ May 1 2007, 04:52 AM) <{POST_SNAPBACK}><div class='quotemain'>^^im with you pete. i think strokers rock,i also think they will return in the future, one of the advantages ofa 2 stroke against a 4 stroke is the lack of internal friction the downside is the porting,in the old days they used a shnuls loop to lession the effect of the intake and exaust ports being open at the same time.
direct injection tecknolagy does excist to make an efficiant 2 stroke but there just out of fashion at the moment.

Face it, they ain't comin back. The worlds gotta go green now man, and even though a bike is nothing compared to a coal power plant, greenies don't discriminate.

It's not all bad though Rog, I'm here to support you and all other helpless two stroke addicts. You just need to get over the buzz and welcome the roar!

And in answer to the original question, whatever produces close racing is good, so I like the 800s. We've allready seen some good stuff, glimpses of potential. As a toy, though, you gotta have the biggest, badest, fastest, four-strokest monster out there, it's gotta be a 990 for me.

<div class='quotetop'>QUOTE (richo @ May 1 2007, 05:14 AM) <{POST_SNAPBACK}><div class='quotemain'>It's not all bad though Rog, I'm here to support you and all other helpless two stroke addicts. You just need to get over the buzz and welcome the roar!
cheers mate, it's good to have you back posting again, hope your studdys are going well.

back on to the strokers, never say never.
there are a few downsides, but i believe they will come back one day, people said diesel cars were dirty noisey things and no one wanted one,about 50% of cars in the uk are now diesel because they are now quiet and clean.

yeah, but they cleaned the fuel up as well as the engine. The main advantages in a two stroke comes from its simplicity. To make it more green/efficient/whatever, you gotta add stuff on, reducing the simplicity and taking away the engine's main advantage

Hmmm, in Trials and Motocross news, KTM are behind a push to bring back 2 strokes (backed by FIM) due to the cost and unreliability of high performance 4 stroke crossers. A lot of folks are saying that the 4 strokes are killing grass roots MX due to the cost. I also heard that dealers are not keen to take 4 stroke crossers back in PX due to the expensive engine failures.....they dont want to sell a timebomb on and be liable for it....

Pete