ESE's works engine tuner

[aljaxon]

Mota doesnt know who Wobbly is , but you can enter the " correct" duct exit into the input and it wont have any idea what you have done.

i wish i was able to use solidworks. ive only just took the time to learn how to use autocad on a basic level.
i saw this video



around the 2min 30 mark he uses mota8 to do an optimisation of the pipe. dunno if its able to do that with any accuracy or if its just a gimmick. i guess we will find out soon enough. the video maker says engmod2t is far superior in every way to mota8 but he was intrigued by the pipe optimisation feature.

[lodgernz]

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150cc two strokes. Might be time to look at a F4 rule change to allow us two strokers to be able access more modern engines and regain some competitiveness with the fast four stroke guys.

Either that, or stop the 4-stroke cheating.

[wobbly]

Only issue with the 150 class in Asia is that every single fast bike is a KR - but knowing you guys any combination of parts is possibly better.

Im doing a racebike engine project and need a 350YPVS cylinder / piston just to measure up. Anyone got one I could beg/borrow/steal for a day.

[porttiming124]

Hello everyone. I do dyno (snowmobile engine) in my personal garage.
I want to reduce engine noise in the garage because even though I have a big truck muffler outside. I realize that the noise is coming from inside the garage.
So to reduce the noise I thought of making a long silencer for each pipe with a length of approximately 900mm ( I know it's long but it's a brain storm) with an internal diameter of 38mm. Connect directly to the end of each tune pipe. At the exit of this long silence the exhaust would be sucked in by the large 8 inch pipes of the blower. My biggest fear and my question.
Will this long muffler extension with a diameter of 38mm change the tuning in your opinion?
Do you have a better idea?

[F5 Dave]

Either that, or stop the 4-stroke cheating.

I'm told there are lots of rumours of 180 kits. Bizarre if true.

[F5 Dave]

Only issue with the 150 class in Asia is that every single fast bike is a KR - but knowing you guys any combination of parts is possibly better.

Im doing a racebike engine project and need a 350YPVS cylinder / piston just to measure up. Anyone got one I could beg/borrow/steal for a day.

Let's us know how you get on. All I've got is over sized ported barrels with wiseco.

[lodgernz]

I'm told there are lots of rumours of 180 kits. Bizarre if true.

177cc is common (67mm piston), but there are kits from Malaysia up to 210cc. These require moving the cam drive, so can be recognised if you know how.
I'm told that kits can be had for the Yamaha R15 up to 230cc, which are indistinguishable from the stock cylinder..
Certaily not good for the sport, but some people just have to compensate for their lack of talent with lack of integrity.

[speedpro]

It's a decent size industry in places like Malaysia and Taiwan. My Yamaha 125cc scooter is 229cc built with high quality inexpensive parts from Taiwan. They go to over 300cc but that's getting pretty serious with welding and machining.

[Grumph]

177cc is common (67mm piston), but there are kits from Malaysia up to 210cc. These require moving the cam drive, so can be recognised if you know how.
I'm told that kits can be had for the Yamaha R15 up to 230cc, which are indistinguishable from the stock cylinder..
Certaily not good for the sport, but some people just have to compensate for their lack of talent with lack of integrity.

My experience with Formula Fords suggests the cheaters simply move from the rear of the pack to the middle...

If there's enough worry about cheaters, pull a couple of bikes down at random - after warning them it's coming.

[lodgernz]

My experience with Formula Fords suggests the cheaters simply move from the rear of the pack to the middle...

If there's enough worry about cheaters, pull a couple of bikes down at random - after warning them it's coming.

MNZ has bought one of these:


Goes down a 12mm plug hole and logs the bore measurement. Only works for central plugs unfortunately, and the R15 is angled.

[F5 Dave]

They used to file the GP winners top 3 into an aircraft hanger for strip down. Of course there were no fourstroke bikes in that mix back then until one of the sherrifs boys (Chris I imagine) won on a feelthy honda.

[Vannik]

Hello everyone. I do dyno (snowmobile engine) in my personal garage.
I want to reduce engine noise in the garage because even though I have a big truck muffler outside. I realize that the noise is coming from inside the garage.

A large percentage of the noise is generated by the inlet. Way more difficult to silence without creating a restriction. What do you do for intake silencing?

[Pursang]

A large percentage of the noise is generated by the inlet. Way more difficult to silence without creating a restriction. What do you do for intake silencing?

Connect the Inlet to the Exhaust. Won't help with power.....but it will stop the noise!

[porttiming124]

A large percentage of the noise is generated by the inlet. Way more difficult to silence without creating a restriction. What do you do for intake silencing?

Hello Neels.
Before I had nothing in front of the carburetors.
Last week I made myself a lexan box for 3 reasons.
-the noise
-always breathe in fresh air.
-calculate cfm with the air meter.
But I admit that I have doubts about the tuning.

[Haufen]

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150cc two strokes. Might be time to look at a F4 rule change to allow us two strokers to be able access more modern engines and regain some competitiveness with the fast four stroke guys.

I would love to see a typical power curve of those bikes. Has anyone seen something by chance?

And does anyone happen have to a KR150 EngMod Pack file they would share?