kliped Posted June 8, 2009 Report Share Posted June 8, 2009 (edited) how much compression can i run before the stock crank gives out? i currently have 18cc domes but i was starting to look at 15cc domes. my current set up is listed below, right now i am running straight cam2 (110) and mixing 40:1 with klutz super techniplate also if i switch to 15cc domes will cam2 race gas be enough or will have have to switch to alky or meth stock jugs bored .040 over mild/aggressive port work cool head with 18cc domes toomey t5s vitos power pistons timing set at +5 the trinity 2in1 carb with a 38mm flat slide keihin running cam 2(110 octane) at a 38:1-40:1 mixture with klutz oil also 2 steps colder plugs stock gearing i am right around 800ft elevation btw my current compression is 165psi Edited June 8, 2009 by kliped Quote Link to comment Share on other sites More sharing options...
shanYE west Posted June 8, 2009 Report Share Posted June 8, 2009 Whats your compression now with the 18cc domes? and why do you want to go to 15cc domes? 15cc dome would put you ruffly around 210 psi at 1000ft... Quote Link to comment Share on other sites More sharing options...
kliped Posted June 8, 2009 Author Report Share Posted June 8, 2009 Whats your compression now with the 18cc domes? and why do you want to go to 15cc domes? 15cc dome would put you ruffly around 210 psi at 1000ft... just went and checked my compression again, its at 165. i just want to get a little more power out of it the cheapest way possible and domes are only 50 dollars lol Quote Link to comment Share on other sites More sharing options...
T_Shee Posted June 8, 2009 Report Share Posted June 8, 2009 just went and checked my compression again, its at 165. i just want to get a little more power out of it the cheapest way possible and domes are only 50 dollars lol im no expert but that seems kinda low for 18cc domes Quote Link to comment Share on other sites More sharing options...
kliped Posted June 8, 2009 Author Report Share Posted June 8, 2009 (edited) im no expert but that seems kinda low for 18cc domes idk, the people at vitos performance told me that sounds about right but then again, i am using an auto zone special compression tester.... Edited June 8, 2009 by kliped Quote Link to comment Share on other sites More sharing options...
shee4speed Posted June 9, 2009 Report Share Posted June 9, 2009 here scroll to the bottom to see the chart.Of course you are ported so it'll be a little off. Quote Link to comment Share on other sites More sharing options...
black sunshine Posted June 9, 2009 Report Share Posted June 9, 2009 Sounds like your tester is fucked, or you need a top-end. It's nice to have a base-line when you get a fresh top-end, take a comp. reading with a known good comp tester. You should REALLY have your crank trued and welded if your going to satisfy your compression fetish! :laugh: Quote Link to comment Share on other sites More sharing options...
dajogejr Posted June 9, 2009 Report Share Posted June 9, 2009 Stocker will hold just about anything you can throw at it once welded and trued properly. 15cc domes is asking for trouble...at your elevation. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted June 9, 2009 Report Share Posted June 9, 2009 Yea like dajo said 15cc domes are made for the people in the 6000 ft elevation category. Not for ultimate performance at or near sea level. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted June 9, 2009 Report Share Posted June 9, 2009 15cc domes at or near sea level will hurt performance AND shorten engine life. With that much compression, the motor will be fighting itself at higher RPMs....it might be able to rev out, but it won't pull much past the midrange RPMs.... Quote Link to comment Share on other sites More sharing options...
kliped Posted June 9, 2009 Author Report Share Posted June 9, 2009 hey thanks for your help guys, i never really thought about the compression being to high and killing my top end. can you guys recommend anything thats cheap to do to get a little more power out of it? im at +5 degrees of timing right now, i dont really want to go to much more, maybe another degree or two. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted June 9, 2009 Report Share Posted June 9, 2009 Ditch the single carb setup... That large a carb on that small an engine is hurting it. Get more aggressive porting, get a better top end pipe like a CPI. Quote Link to comment Share on other sites More sharing options...
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