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My motor has a meth injection kit with 2650 Magnuson at around 900whp. It was all driving good for about one month with lots of pulls after the tuning and then blew up.
The engine has been rebuilt one year ago, I just found that the mechanic put a lt1 head gasket into this lt4.
Question is if that will be the cause of the blown.
The only real difference is the color and the LT1 gasket is slightly thinner.. .054 vs .055 is what was published...and the LT1 gasket has fewer layers. Being thinner you'd get a very very small bump in static compression ratio.
That carnage looks like it's from a rod failure or rod bearing failure. Not enough info from the pics to know for sure. In one of the shots it looks like the piston has a hole in it which could be from detonation.
What could be the cause of detonation in this case then? I’m running on 91 plus pure meth. Here are some pics from a good cylinder. It shows there’s some scratches.
Originally Posted by 96GS#007
The only real difference is the color and the LT1 gasket is slightly thinner.. .054 vs .055 is what was published...and the LT1 gasket has fewer layers. Being thinner you'd get a very very small bump in static compression ratio.
That carnage looks like it's from a rod failure or rod bearing failure. Not enough info from the pics to know for sure. In one of the shots it looks like the piston has a hole in it which could be from detonation.
The only real difference is the color and the LT1 gasket is slightly thinner.. .054 vs .055 is what was published...and the LT1 gasket has fewer layers. Being thinner you'd get a very very small bump in static compression ratio.
That carnage looks like it's from a rod failure or rod bearing failure. Not enough info from the pics to know for sure. In one of the shots it looks like the piston has a hole in it which could be from detonation.
I agree. I don't think its from the head gasket, but a rod failure. Do you know how much torque you were making. Anything above 900 and these rods seem to become very unhappy.
It’s about 800 ft-lb on wheel. My mechanic told me it will make no problem with stock rods when he rebuilt the motor but I’m not sure.
Originally Posted by ZMC2001
I agree. I don't think its from the head gasket, but a rod failure. Do you know how much torque you were making. Anything above 900 and these rods seem to become very unhappy.
What could be the cause of detonation in this case then? I’m running on 91 plus pure meth. Here are some pics from a good cylinder. It shows there’s some scratches.
Could be a multitude of things in the tune. Could be a fueling issue, etc. If you have a past dyno run with A/F ratio data, that would be telling.
Scoring on the cylinder wall is from the rings. Many things can cause that too...the gap was incorrect, the pistons were rocking in the bore due to the rods, detonation as mentioned, "all of the above"
Unfortunately when running high hp, "**** happens". Some guys can run years without issues and others...not so much. I've been on both sides of the coin and it sucks when one lets go.
If you're not port injection with the meth you could be getting det because not every cylinder will get equal amounts of meth.
Chris from ECS told me they usually see the rear cylinders running much hotter with dual jet setups spraying from the intake tube.
also thats a lot of power for 91oct pump gas.
I agree and the first thing I thought when I saw the carnage is it was lean. Watch some of the Late Model Racecraft Youtube videos and he says that is why they don't do Meth injection. It is the same as with nitrous, a solenoid malfunctions, one cylinder doesn't get the amount of meth needed and you go lean. Bad things happen when you go lean anytime but with high HP it makes it worse.
Head gasket would not have been a factor, it was still a MLS gasket and the builder probably used it get the piston clearance and compression he wanted.
I broke a valve on a $50,000+ race engine at 7500 rpm when it went lean from something going through the carb and ( we think) and caused 2 cylinders to go lean. Was there peppering on top of the cylinders or plugs? That is usually a tell tale sign
2019 lt4 blown
