Quote:
Originally Posted by Jerry in Shasta
I have a LSH I It pings/detonates at 10 degrees advance light acceleration on 103 octane fuel.
I have soften all the share machining corners an smoothed out the chambers, still pings badly to the point that it is unusable.
It was given to me by a very knowledgeable Model A guy that could make it work either
Any ideas?? Sorry I don't own a boat.
JB
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I see that you have a LSH I.
1. I had a
BRAND NEW early
LSH III that did same thing.
If I pushed it
under load for a
short time after the pinging started, there was a big bang and engine would die until I let up on the gas.
I removed it
SHORTLY AFTER I installed it.
Then a guy offered me $145 more than paid for it 3 months earlier.
At the time I did not know about the sharp edges in chambers.
2. One other place for sharp edges is the spark plug threads if plug reach is too long and the threads extend into combustion chamber they will glow and detonate.
Gaskets with sharp edges also which extend into combustion chambers.
Like if the bore is 0.100 and the wrong gasket is used.
Some early GASKET versions are for standard to .060 and if installed on a 0.100 engine the gasket will extend into chamber.
My friend had a LSH III, with Weber 2 barrel, recently (last 6 to 12 months) which had no problems. Not sure what was done to it make it work before he bought the car.