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Old 02-08-2000, 06:43 AM
ColMc
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G'day All, new here but wonder if I might find a few new ideas ...

I got a Merc 450 V8..'76 and first of the K Jets and pre pollution.

The problem is a vacuumn advance ping that I don't believe is because of the low octane Super we get nowadays.

Advanced curves are spec.

KJet is right where the engine likes it .

Have compared comp press' with same year engine that didn't ping.

Only thing I don't know is the profile of the crown of the pistons .

I wonder whether the ping is some swirl experiment that was easily sent into detonation..???

I think the engine might be a '75 engine ....the fuel head has a solenoid at the back thats refered to only as '75 models
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Old 02-08-2000, 09:36 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
There are a few things that will cause this. One is engine temp being too high. One is incorrect ignition timing and one is low octane (below 89) in conjunction with the above.

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