Yamaha KT100

[oppolo]

true, you don't need to be so exactly under 4000 rpm, following the power curve, drawing an immaginary curve under 4000, making it drops, following the power curve of the exiting kf3 for example

[EVO]

You simply won't get data for it because the engines don't run that low, only at idle with no load. If you made numbers up it would not change the driving experience. By Australian rules you will generally run approximately 5500-11000 with a J and 8000-15500 with an S, below that it won't matter what numbers you use because they will only be used to get out of the pits.

OK Nate can you make the .engn? with dyno chart and graphs ArrowJ is getting

[Nathan Dunnett]

Sure, no problem.

[oppolo]

http://www.youtube.com/watch?v=Sb-3UTmDNmc

why he choke? I thought it was needed only for 100cc engines that revs at 20.000 rpm

[Nathan Dunnett]

Because the S runs at over 200 degrees. Choking cools temperatures by up to 20 degrees and also improves engine braking. Some corners I don't even lift off the throttle, I just brake and choke. The J on the other hand only runs at 160-180 and most people don't bother choking.

[oppolo]

Because the S runs at over 200 degrees. Choking cools temperatures by up to 20 degrees and also improves engine braking. Some corners I don't even lift off the throttle, I just brake and choke. The J on the other hand only runs at 160-180 and most people don't bother choking.

ahaaa, thanks so much! 93 celsius.
choke is interesting, it adds some difficult more at the driving, hope these KT100 will be simulated very well.
best wishes and thanks

[Nathan Dunnett]

No, 200 celsius. 

[oppolo]

I didn't know, now I have used google, the temp around the spark plug is over 200 c in a race 2 stroke air cooled engine, thanks again for info

[EVO]

yeah my S overheats in 20 lap race on 100km/hr track. I can feel the power loss. 

[oppolo]

good, so we will use the same drive tecnic as f100, air choke and be carefull to carb

[Matthew McLean]

You simply won't get data for it because the engines don't run that low, only at idle with no load. If you made numbers up it would not change the driving experience. By Australian rules you will generally run approximately 5500-11000 with a J and 8000-15500 with an S, below that it won't matter what numbers you use because they will only be used to get out of the pits.

I race very commonly in the KT100S class in Australia (Clubman Light) and it is not rare at all for drivers to get their engines to 16000. So I would say between 5500 and 15800 naturally, but can get to 16100 with higher gearing. If you happen to get airborne, it should blow at about 17100. Also, if possible of course,  the draft shouldn't give as much as an RPM gain as what the F100 does as it would be totally unrealistic. Draft is usually worth about 200 RPM.

[Praga91]

i agree with Matt. The KT100 S run between 6000 - 15,800. My Kt100 was built to NZ Kartsport Specs, and would sit comfortably on 16,400 in draft and 16,200 without you cant compare a J to a S. J's are like lawn mower engines.

[Nathan Dunnett]

Yeah like I said that was just approximate. All of the five S engines that I've used have only revved to 15300-15500, sometimes less, and yes they were good engines. It depends on the track and how they're built, but I do know some people rev them higher.

[Praga91]

one old one sat at 16,800 quite nicely i miss my air cool F100 though 25,000

[EVO]

Does anyone have any interests on working on the sound?  Jared?