AKheathen Posted June 22, 2010 Report Share Posted June 22, 2010 oh, hahq, yah, you should be measuring at the end, by the cyl wall, where it is the tightest. Quote Link to comment Share on other sites More sharing options...
Modified RC Posted June 22, 2010 Report Share Posted June 22, 2010 I like to hold two pieces of solder at the same time same bore both inline w/the wristpin. This will help give you a very accurate reading. +1 to that advice Using 2 pieces of solder will get the closest reading because the piston can not rock to one side, all bearings have a little play in them so use 2 pieces of solder to eliminate the play in the wrist pin bearings to get the closest reading. Quote Link to comment Share on other sites More sharing options...
lt1bird Posted June 22, 2010 Author Report Share Posted June 22, 2010 Ok, that all sounds good! Thanks! Quote Link to comment Share on other sites More sharing options...
sheefreak Posted June 22, 2010 Report Share Posted June 22, 2010 +1 to that advice Using 2 pieces of solder will get the closest reading because the piston can not rock to one side, all bearings have a little play in them so use 2 pieces of solder to eliminate the play in the wrist pin bearings to get the closest reading. Quote Link to comment Share on other sites More sharing options...
bansheeqc Posted June 28, 2010 Report Share Posted June 28, 2010 maybe you have a lil gasket thickness variation, maybe explain a part of the 0,053 vs 0,050 Quote Link to comment Share on other sites More sharing options...
lt1bird Posted June 29, 2010 Author Report Share Posted June 29, 2010 The squish from the left cyl to the right cyl is off a bit. Very wierd. one is .053 and the other is .050...... not sure its worth worrying about. I losened up the cyl bolts, retoqued the cyl with more torque on the .053 side first, then did the other side. That helped a bit but later I did another final torque and it went back to where it was. Im wondering if the .060" base gasket just has more play in it than a normal gasket... might be more sensitive to even torquing on all the cyl nuts.... I think I was hoping that after a few warm up cycles that the gasket would crush down more even. I put a dial indicator down the spark plug hole and measured the distance from the top of the dome to the piston top and both sided were dead nuts the same. kicking PSI in that larger squish cyl is also down a tad by 5psi due to the .003 diffrence.... whats the spec for PSI from cyl to cyl max diffrence? Thanks Quote Link to comment Share on other sites More sharing options...
okbeast Posted June 29, 2010 Report Share Posted June 29, 2010 I've heard 10% difference, but usually it's alot worse from a catastrophic failure or just both sides are worn out. Quote Link to comment Share on other sites More sharing options...
lt1bird Posted June 29, 2010 Author Report Share Posted June 29, 2010 10% is what i saw in the manual as well.... im at about 4% so i guess thats fine in the grand scheam of things. thanks! Quote Link to comment Share on other sites More sharing options...
sheefreak Posted June 30, 2010 Report Share Posted June 30, 2010 I would run it! Quote Link to comment Share on other sites More sharing options...
AKheathen Posted June 30, 2010 Report Share Posted June 30, 2010 Holy crap .060"? I might think about torqueing the cyls down in sequential steps......5-15-22. Even though, 5psi is about the max I would live with, but the rings still need to seat. What's the reason for the thick gasket? Just needed for squish? Quote Link to comment Share on other sites More sharing options...
lt1bird Posted June 30, 2010 Author Report Share Posted June 30, 2010 I filled the deck with epoxy and then did a machine clean up pass on it. the reason for the .060 base gasket was to increase the quish to .050 from .030. I could do custom domes with a .039 gasket but I figured the thicker gasket gets me closer to the correct height for the port timing. I could drop the gasket a bit with a .039 and stack a .012 on top...Im machining some domes now so ill see what the squish ends up at with the new 12 degree squish angle... and 25cc domes to bump the compression up to 150PSI for 93 ocatane use... I agree, im thinking i rushed when I torqued the gasket the first time so it was sightly compressed more on one side( I was trying to figure out how to properly do the trinty cyl as its one compenent. Im thinking I should have started with the center bolts and worked outward in a criss cross pattern. I didnt do it as I was rushed LOL... Im sure after a heat cycle that gasket will get flater LOL Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.