J06CVPI02 Posted June 17, 2020 Report Share Posted June 17, 2020 I have a 2001 banshee hot rods 4 mil stroker with 5 mm longer rod. fmf fattys and silencers. Nos racing cool Style head vfroce 3 reeds stock ported cylinders 65 mm bore Wisco 295 long rod series pistons. (just a clean up job on the intake and exhaust ports. And the same on the cross ports. Like a stage one.) my domes are 4 mil cut 20cc stock carbs +5 degrees timing jetting is as follows mains 340 pilots 25 (2 turns out) needle 2nd from top. im using castor 927 two stroke oil at a 32:1 ratio with 93 pump and c16 vp race fuel which is 107 octane 50/50 (So if I use 2.5 gallons 93 I use 2.5 gallons vp) Riding in temps between 70 and 90 degrees at sea level. I noticed my bike was running hot. too hot the last few weeks. slowly (very slowly) Lost coolant from the Overflow reservoir. Over a period of about 3/4 weeks it went from the full line to dry. 2 days ago, (Sunday) I was out riding and at wot I got bog and suddenly engine didn’t wanna stay running. Noticed coolant seeping through the left stud on the cool head. I wasn’t using acorn nuts and Crush washers. I was using flange nuts. Took the head off and the left piston is destroyed and wet with coolant.. so is the dome. It’s pitted. Right Piston was fine and so is the dome. but the wrist pins are locked into both pistons. Having a difficult time getting em out I’m assuming from the heat. what do you guys suggest I do when I put this back together? Lower my timing? Use a different size base gasket? (For squish reasons) Etc I ordered new pistons and I’m gonna attempt to have my dome repaired. my cylinders walls are smoother than a baby’s behind. So I lucked out There. What do you guys suggest I do To make sure this doesn’t blow up again? Quote Link to comment Share on other sites More sharing options...
the boris Posted June 17, 2020 Report Share Posted June 17, 2020 Maybe too much compression caused detonation. What was your compression? Sent from my VOG-L29 using Tapatalk Quote Link to comment Share on other sites More sharing options...
the boris Posted June 17, 2020 Report Share Posted June 17, 2020 Also 5 degrees advance with 20cc domes Is pushing it at pump gas. Sent from my VOG-L29 using Tapatalk Quote Link to comment Share on other sites More sharing options...
J06CVPI02 Posted June 17, 2020 Author Report Share Posted June 17, 2020 10 minutes ago, the boris said: Maybe too much compression caused detonation. What was your compression? Sent from my VOG-L29 using Tapatalk I don’t know what my compression was because I never checked it. Ugh 😑 Quote Link to comment Share on other sites More sharing options...
J06CVPI02 Posted June 17, 2020 Author Report Share Posted June 17, 2020 9 minutes ago, the boris said: Also 5 degrees advance with 20cc domes Is pushing it at pump gas. Sent from my VOG-L29 using Tapatalk So what do you think I should go down to? +4 or +3 degrees? Quote Link to comment Share on other sites More sharing options...
the boris Posted June 17, 2020 Report Share Posted June 17, 2020 I'm not very experienced but I'm running 21cc domes on standard engine with 4 degrees timing advance and pushing out 135psi of compression.I was advised by members here to leave it at 4 degrees as it would cause predeto if I go more.Sent from my VOG-L29 using Tapatalk Quote Link to comment Share on other sites More sharing options...
J06CVPI02 Posted June 17, 2020 Author Report Share Posted June 17, 2020 I had another question to. Can I use a .12 base gasket? or would my squish be to tight? and if I use non stroker domes, do I need a spacer plate? I ask About the non-stroker domes just in case I can’t get My pitted dome fixed or he can’t or doesn’t want to fix it. I have an extra set of domes that ran on pump gas no problem that were off my old set up which was a wisco crank stock rod length. Quote Link to comment Share on other sites More sharing options...
J06CVPI02 Posted June 17, 2020 Author Report Share Posted June 17, 2020 2 minutes ago, the boris said: I'm not very experienced but I'm running 21cc domes on standard engine with 4 degrees timing advance and pushing out 135psi of compression. I was advised by members here to leave it at 4 degrees as it would cause predeto if I go more. Sent from my VOG-L29 using Tapatalk Ima go down to +3 Quote Link to comment Share on other sites More sharing options...
ginger Posted June 17, 2020 Report Share Posted June 17, 2020 10 hours ago, the boris said: Also 5 degrees advance with 20cc domes Is pushing it at pump gas. Sent from my VOG-L29 using Tapatalk its not just pump its mixed 50/50 with race gas. octane isnt the problem, the pitting and stuff is from a melt down or detination from a head leak, My guess is that you have a air leak somewhere and it sucked air on that cylinder causing it to melt down, Quote Link to comment Share on other sites More sharing options...
SandSlingerOR Posted June 18, 2020 Report Share Posted June 18, 2020 Make sure you do a proper leak down test to rule out a air leak after assembling everything. Quote Link to comment Share on other sites More sharing options...
J06CVPI02 Posted June 18, 2020 Author Report Share Posted June 18, 2020 Ok. My porting guy is suggesting I get a entirely new crank and bore over my cylinders again. There already at 65 mm. He Said crank is shot. And he Said that the piston was hitting the dome. I don’t know. Crank looks fine to me. Quote Link to comment Share on other sites More sharing options...
ginger Posted June 19, 2020 Report Share Posted June 19, 2020 if your that worried that things arent right, send it to a vendor here. most of them all they do is banshees, so everything will be perfect when you put it back in. Quote Link to comment Share on other sites More sharing options...
registered user Posted July 16, 2020 Report Share Posted July 16, 2020 (edited) On 6/16/2020 at 7:51 PM, J06CVPI02 said: What do you guys suggest I do To make sure this doesn’t blow up again? Edited July 16, 2020 by registered user Quote Link to comment Share on other sites More sharing options...
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