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Originally Posted by gnfanatic
Hey julio, hope all is well. Can you explaint to me if there if alky injection and silent detonation has something in common?? my steel mains were black and #3 main almost distorted. Engine builder told me alky injection can cause silent detonation..
thanks
Ralph
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Ralph.. your Off Topic
No. More than likely he screwed up with bearing clearances creating the issue. This is extremely common when steel mains are used. As they have to be cut to fit.. then lots of massaging. Its very easy to make a mess.
This is why I built mine using the stock mains and a girdle. To try and eliminate machine shop errors. On my motor my mains are at .0019-.0020. Rods are at .002. I used the redrilled cam bearings to push more oil to the bottom. So far so good.. tons of passes.
Now when injecting an extreme amount of alcohol, you can get pre-ignition. Pre-ignition is another form of detonation. On my kit and a Buick.. probably have to run 3 M15 nozzles at full boogie then bounce of the rev limiter for a good amount of time.
Your oil when racing the motor has to be frequently changed. Methanol or not. As the heat and wash down associated with racing will break down the best oil. If the dipstick is not honey colored... change the oil. Waiting for XXX amount of miles will destroy any high boosted motor. Think of it this way, 500 miles=2000 1/4 mile passes. If your not racing the motor, then normal oil change intervals can be observed. Oil is the cheapest maintenance.. and the one most overlooked.
Better check the bearings for patterns after getting it back from the machine shop. You dont want to see any scuffing, and confirm the clearances above. Heat is what kills bearings.. comes from lack of lubrication. If you were not changing the oil on the motor letting it turn black.. and racing it.. then that would have cuased your bearing failure.
Need any advice.. you can always call.. I think you went to an XFI.. if so, I can send you my .gct and it may help you get squared away a lot faster.
Now back on topic please..
