jonnienumberfive
Scoot Member
just found this 1970 2 cylinder 2 stroke yamaha in a barn,been there since 1980
Posts: 87
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Post by jonnienumberfive on Jun 10, 2012 19:40:21 GMT -5
I have read many times,rollers or sliders determine the "constant engine speed"..this being said I also hear lighter = more rpm BUT you loose top speed...this I can't understand,as rpm will determine top speed..all else being left alone..I'm hoping someone here can enlighten me...  |
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katastroff
Scoot Member
Dont F*%$ With Me, I'm a Dad!!!
Posts: 67
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Post by katastroff on Jun 10, 2012 20:02:52 GMT -5
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jonnienumberfive
Scoot Member
just found this 1970 2 cylinder 2 stroke yamaha in a barn,been there since 1980
Posts: 87
|
Post by jonnienumberfive on Jun 10, 2012 20:27:36 GMT -5
thanks,but not quite enough technical info....anyone else??
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Post by 90GTVert on Jun 10, 2012 20:34:43 GMT -5
The problem with light rollers and losing speed is that speed requires not only RPM, but power. You can slip the engine to a high RPM through use of various components, but that doesn't mean it's making power there. For best results, you really need to keep the engine where it makes good power.
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jonnienumberfive
Scoot Member
just found this 1970 2 cylinder 2 stroke yamaha in a barn,been there since 1980
Posts: 87
|
Post by jonnienumberfive on Jun 10, 2012 21:20:14 GMT -5
thanks..so what the rollers are doing is keeping the engine in the "power band"..depending on what if any mods the rollers try to maintain the correct rpm ...
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Post by 90GTVert on Jun 10, 2012 22:15:34 GMT -5
Right. The more you can stay within the powerband, the quicker and faster you'll be. That's why some aftermarket variators and torque drivers can really make a difference in performance. They are designed in ways that keep RPM more steady than the stock stuff so you can tune to stay much closer to peak output more.
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