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Re: Help! Burned piston
Here are some http://www.cpperformance.com/SearchR...CategoryID=257
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Re: Help! Burned piston
180 degrees is too hot. You should have a 142 degree thermostat and temp should stay close to that at all times. 10 to 1 compression is pretty high for the junk gas we get nowadays. Where did you get those heads? They look like early closed chamber heads from the 1960's.
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Re: Help! Burned piston
Originally Posted by Wobble
I am not racing myself at the moment, but am seriously looking at getting either a UMP Modified or a limited Modified. Both classes are very strong around here.
I was crewing for Dan Sikes and Kyle Anderson on the 54 & 55 TUSA Mod Lites. This year Dan has a UMP Modified and Kyle has a SUPR Late model. The Modifeid has been a real learning experience, especially the rear suspension geometry, we got a 3rd last Saturday at Baytown against some strong competition. Kyle Broke his arm in Dallas so we wont run the late model until May 6th at Baytown. Do you know Gary Watson of Gary Watson Racing? |
Re: Help! Burned piston
1 Attachment(s)
Originally Posted by cstraub
Mark
Do you know Gary Watson of Gary Watson Racing? When I have time I crew on Brandon Berryman's ASCS sprint car and help the Tankersley's when I can. Results http://www.ascsracing.com/results.asp?ID=56979&yr=2006 Gary is definitely a hard charger. |
Re: Help! Burned piston
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Re: Help! Burned piston
PatriYacht:
The heads are gm part number 12363392 I didn't build these motors, I just bought the boat last fall with these motors already in it. If I knew then what I know now, I would have walked away! I think I'm going to scrap the water setup and go with a crossover / bypass with 140 thermo. Wobble: Small world! Dan Sikes has been giving me advice on my boat problems. I'm sure I've met you at the track over the last couple of years. I was #39, first it was an orange dwarf, then a red/white mod lite |
Re: Help! Burned piston
I couldn't find that head in the cross reference but I did find this one.
12363391...96-up...oval...OPEN...Bowtie, Aluminum, Signature Series, fits MKIV, Gen.V, Gen.VI, 110cc chamber If you are using this head or a similar one, your compression would be over 10 to 1 on a 540. Also if this is a 4.5 bore engine, you have the wrong head gaskets. The proper gaskets are 1047 for street or 17048 for marine. |
Re: Help! Burned piston
yep, that's the casting number on these heads. I just pulled the pistons out, they are srp with -3cc dish. That puts the compression somewhere around 10.4... I am thinking about getting a brodix top end kit and maybe some lower compression pistons.. any ideas???
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Re: Help! Burned piston
Is your engine a 540 with a 4.5 bore? Having a too small head gasket hanging in the combustion chamber is a nasty detonation cause. The 1037 is a gasket for a 454.
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Re: Help! Burned piston
actually, it's 4.53 bore. maybe that contributed to the failure?
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