conneroutlaw

I agree with you also. Last year i blew a head gasket and the rpimary reason was that i should of had arp studs in it. After my mechanic opened the engine, he changed things and put better parts in it so that my engine was built exactly like a high performance 502 out the mecr doors and it would handel the stress of the super charger. He rebuilt the engine the way they should of did it from the begining when the super charger was installed. He said the one reason it went as quick as it did (head gasket), was becasue of the lack of arp studs. He changed and fixed it the way it should be. i am going to run it for alittle and see how things go. The original engine was not stock and the new and improved engine is what it is supposed to be when you put a super charger on it

thanks for your imput

jj

articfriends

iTrader: (1)

I answered this in the GD forum BUT I will tell you this, at 8 psi of boost you DID NOT blow/lift a head gasket from NOT having arp studs, the stocks ones are not THAT weak, especially with iron heads. This "sputtering" you are refering to that went away with increased fuel pressure sounds more like un-controlled detonation from leaning out due to lack of fuel caused by your old parts not being up to task. I hope someone is gong to be in your boat with a scanner/laptop reading knock and a AFR O2 gauge in your exhaust with knowledge and skill to retune your ecu when you get this out on the water or the very same thing may happen again, Smitty

obnoxus

Do you have A/F guage and EGT gauges??

gsxr1216

IMO you should have dynoed that motor when it was out of the boat, then you would have gotten some very valuable information about what the motor needs to be in tune, RPM's, ETC, it would have been $$$ very well spent.

Running a boosted engine and have it sputtering at WOT usually leads to bad things REALLY quick. if i was going to guess it was lean before you blew the head gasket and thats why the gasket went before. you could have shut the engine off right as it was sputtering and done a plug check to see if it was lean or rich.

when they pulled your motor apart how did all of the main bearings look in it? that could also give you an idea of its state of tune before blowing a gasket, how did the pistons look, any signs of detonation? I hope you have a fuel pressure gauge on your dash, and a way to read A/F ratio, or at least a way to be able to data log fuel pressure and A/F or you are going to end up with some very expensive ashtrays in a very short time.

I'm not trying to be mean here, but from reading your past posts of the issues you keep having with this boat, and hearing about your mechanic i think you both are in over your heads on this, i would really search for someone with proven experience on procharged marine engines and get that boat to them ASAP and have them tune it and get it running properly for you or you can end up another several $k deep into putting it back together again. once they get that boat all tuned for you it will be a very fun boat for you. its kinda like the old saying, pay me now or pay me later, but it usually costs a lot more later!

good luck man and i hope you have a good summer!