Stinger Posted May 25, 2006 Report Share Posted May 25, 2006 I've got a shaved stock head (.038" shave) and it gave me 155psi on my stock motor. Now I'm ported and I've only got 140psi. I want to go back to 155 or so. I don't want to run race fuel, just 91 octane pump gas. I believe my current head domes measured 20.5-21cc, it's been a few years though. My elevation is 1600 feet, I do ride at LS as well. Timing is +4 Wiseco Pro-Lites Stock Crank Ported Should I go for 20cc or 19cc domes? According to the chart on Noss' site, it looks lilke 20's may only get me another 8-10psi but 19's may be too much for pump gas. Got any Input? Quote Link to comment Share on other sites More sharing options...
DIRTMAN350 Posted May 25, 2006 Report Share Posted May 25, 2006 PM Dlnoss on here and he can get ya hooked up with the right domes for your mods and elevation. Quote Link to comment Share on other sites More sharing options...
dlnoss Posted May 26, 2006 Report Share Posted May 26, 2006 19's would need more octane. I would try to run 93 octane with the 20cc domes since your timing is advanced. If you get the 20cc domes and take a trip to lower elevations, remember to up the octane for the trip. Quote Link to comment Share on other sites More sharing options...
Animalman294 Posted May 26, 2006 Report Share Posted May 26, 2006 And there you go.......... Quote Link to comment Share on other sites More sharing options...
thegroup Posted May 26, 2006 Report Share Posted May 26, 2006 I've got a shaved stock head (.038" shave) and it gave me 155psi on my stock motor. Quote Link to comment Share on other sites More sharing options...
jury Posted May 26, 2006 Report Share Posted May 26, 2006 im running AV Gas (100 LL oct. with lead, wont hurt 2-strokes) with 18cc's in my Prodesign and no problems yet. im just on the Missouri side so there can be much of a diff in elevation 520932[/snapback] will it not hurt to run straight 100LL?? if not i want to try it out.. Quote Link to comment Share on other sites More sharing options...
RILS Posted May 26, 2006 Report Share Posted May 26, 2006 No it wont hurt i run about 175psi and run straight 111octane.I paid 275 for the 55gal drum the other day just went up it was 250. Quote Link to comment Share on other sites More sharing options...
dawarriorman Posted May 26, 2006 Report Share Posted May 26, 2006 will it not hurt to run straight 100LL?? if not i want to try it out.. 520958[/snapback] I've been running straight 100LL for about 6 months now, and it runs great. Quote Link to comment Share on other sites More sharing options...
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