I have a Eric Gorr ported CR 500 cylinder.Exellent job and power gain.One thing i am wondering:When the piston is in midstroke i can see there is access from exhaust ports sides to transfers via pistons sides.I mean through the lightened area which are around piston pins ends.My question is:Does the Wiseco piston cover more exhaust side?Can i get even more power with Wiseco if the transfers are not connected to exhausts momentarily?
CR 500 Wiseco piston
- Thread starter CRmann
- Start date
EricGorr
Super Power AssClown
- Aug 24, 2000
- 708
- 1
Interesting question, yes Wiseco does make full circle pistons with the lightening holes in the inside rather than cast reliefs like the stock piston has. I think that for your model the Pro-Lite has lightening holes from the outside. Does it matter? Yes but more so on a 125cc bike. On the 500 its possible that at some time in the rpm range a compression wave will travel through the minor gap between the ports when they overlap and enter the crankcase via the transfers. But that normally happens on all 2-strokes and the effect varies with the tuning of the engine. Let me put it this way, if it was a big problem the reed petals would get burnt and frayed on the edges.
smokeyhaze
Member
- May 2, 2001
- 28
- 0
Here are some more thoughts on the topic -http://www.macdizzy.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=9&t=000169
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NO HAND
~SPONSOR~
- Jun 21, 2000
- 1,198
- 0
I get some of that. On the left side of the reed cage the petals gets burned so that it separates in two. The rubber on the tip of the cage is burned too. Does that mean that I have to find a piston that doesn't have the relief holes on the outside?? OK I have to admit that's after a whole season runnung the same reeds. I don't expect the reeds to last much longer than that anyway but the cage has some marks too.
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