drap660 Posted November 23, 2010 Report Share Posted November 23, 2010 I built my 10mm cub and noticed the piston to head clearance is at about 49-50thousandths..... I usually like to run in the low 40's but is this acceptable for a cub? Im using the cut domes from FAST and a 12 base gasket. Quote Link to comment Share on other sites More sharing options...
BANSHEE HP Posted November 23, 2010 Report Share Posted November 23, 2010 .050 sounds good to me Quote Link to comment Share on other sites More sharing options...
sheefreak Posted November 23, 2010 Report Share Posted November 23, 2010 Most guys run the cub in that area. .045-.052 ish. You are golden! Quote Link to comment Share on other sites More sharing options...
Wheelman Chassis Posted November 24, 2010 Report Share Posted November 24, 2010 i just built a new 10mm cub and set mine at .055... you will be fine.. Quote Link to comment Share on other sites More sharing options...
stroking Posted November 24, 2010 Report Share Posted November 24, 2010 is .040 to low for a 10mil cub ? Quote Link to comment Share on other sites More sharing options...
BANSHEE HP Posted November 25, 2010 Report Share Posted November 25, 2010 generally yes, but it would depend on a few other things like squish band width, uccr compression,bore size. if its a 68mm bore like said above most ppl are between .047-.055. Quote Link to comment Share on other sites More sharing options...
stroking Posted November 25, 2010 Report Share Posted November 25, 2010 generally yes, but it would depend on a few other things like squish band width, uccr compression,bore size. if its a 68mm bore like said above most ppl are between .047-.055. it was .040 squish,wide squish band,20cc domes,180psi,+12 timing,and 68mm bore Quote Link to comment Share on other sites More sharing options...
alcoholbanshee Posted November 25, 2010 Report Share Posted November 25, 2010 it was .040 squish,wide squish band,20cc domes,180psi,+12 timing,and 68mm bore If this has anything to do with your 10mil Vitos cranks.........I think you may have found one of the contributing factors.............................. Quote Link to comment Share on other sites More sharing options...
stroking Posted November 25, 2010 Report Share Posted November 25, 2010 well i did not build this engine,im rebuilding it for him. when i got it that was how things were setup. Quote Link to comment Share on other sites More sharing options...
alcoholbanshee Posted November 25, 2010 Report Share Posted November 25, 2010 well i did not build this engine,im rebuilding it for him. when i got it that was how things were setup. Thats cool....not pointing fingers, just sayin' Quote Link to comment Share on other sites More sharing options...
J-Madd Posted November 26, 2010 Report Share Posted November 26, 2010 My 10 mil Cub is 0.052" and 210 psi. I think I'm gonna tighten the squish a tad and lower compression before next year. My 78 mm bore Twister is at 0.048" It goes down to 0.042" if you check both sides of the piston at the same time. Flat top piston, though, if that matters. I've ran a 421 Cub at 0.038" and at 0.050" with the same results at the track. Quote Link to comment Share on other sites More sharing options...
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