blowit Posted April 28, 2010 Report Share Posted April 28, 2010 I will take a port height measurment and check squish 2 morrow. If you could check back in on me that would be great Did you want fries with that?? JK, yeah, I will check back later. Back to work now... Quote Link to comment Share on other sites More sharing options...
PassionRE Posted April 29, 2010 Report Share Posted April 29, 2010 Have you checked your compression with a gauge? If your running a .020" base gasket with 795 series pistons on a 4 mill crank with 23cc total volume domes(flat plate) your pushing over 200 psi. The plugs coming loose is detonation, so is the pattern shown on the picture you posted. The oring condition is caused by extreme overheating...they are made of Viton and can stand alot of abuse...more investigation may be needed...Jim Quote Link to comment Share on other sites More sharing options...
robert0762 Posted April 29, 2010 Author Report Share Posted April 29, 2010 (edited) Have you checked your compression with a gauge? If your running a .020" base gasket with 795 series pistons on a 4 mill crank with 23cc total volume domes(flat plate) your pushing over 200 psi. The plugs coming loose is detonation, so is the pattern shown on the picture you posted. The oring condition is caused by extreme overheating...they are made of Viton and can stand alot of abuse...more investigation may be needed...Jim Def not 23 cc total volume cause i ran a half tank of 93 octane through it and this is all that happened . So they have to be 23 cc corrected. I think I pinched the ring a lil on assembly. Edited April 29, 2010 by robert0762 Quote Link to comment Share on other sites More sharing options...
robert0762 Posted April 29, 2010 Author Report Share Posted April 29, 2010 You are probably all loaded up and you are getting non-atomized fuel up in the head. Yes, caster coats things very well. Expect to see things a little gummier. I am betting you are fine. oring it and run it. A good idea to test comp and squish though. If you give the exhaust port height, that will help determine if your comp is where it should be. B Ex port is 28 mm below deck Quote Link to comment Share on other sites More sharing options...
blowit Posted April 29, 2010 Report Share Posted April 29, 2010 Ex port is 28 mm below deck Sounds good. Get that comp reading and report back. After looking at the pics again, I agree with Jim, there does look like signs of detonation on the exhaust side of the piston and dome. The orings still look pinched and not fried, at least in the pics. That comp reading should sure shed some light on the situation. Remember to do it correctly though. Plenty of posts here on that. B 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.