ORIGINAL: enjoymentboy

That's a nice site. Thanks for the link. If anyone has a problem getting it to work there is a comma at the end of the posted link that shouldn't be there. Try this instead. www.affordablenitrotech.com

I don't like to knife edge the crankshaft intake. Most people will tell you that it doesn't change the intake timign but my experience tells me that's not the case. I have tried this on some junked cranks and compared them before and after with a degree wheel and a stock crankcase. I found that in general (and this is only a generality not a given) that doing this opens the timing about 2° - 3°. Not much but it will affect the engine operation. Maybe good. Maybe bad but there was a change. I confirmed this was NOT due to removign any material from the outer edge by putting red marker on the edges of the intake port and grinfing and sanding until they were nice and sharpe with some of the red still just sowing. The over all opening size was not changed but the hole was made bigger as the walls were thinned. I hope that was clear.

Think of it this way you have a hole that is 10mm wide with each wall being 2mm thick giving a total width of 14mm. If you thin the edges on each side by 1mm you now have a 14mm overall width but the hole is now 12mm wide with means that each side will open 1mm sooner.

Enjoymentboy