Detonation? Is there a fix?

tonkota

 
Joined
Sep 28, 2004
Messages
2,130
Location
Spokane, WA
How can I tell if my engine is suffering from detonation? And if it is, how can it be fixed?
 

dgangle

total rice
 
Joined
Nov 24, 2004
Messages
4,002
Location
Heart of Dixie
higher octane fuel and/or adjust the timing. Don't ask me to what unless its a SBC, in that case its 36-38* total advance.
 
Joined
Apr 10, 2004
Messages
1,655
Location
san pancho, ca
If you listen for It, you should be able to hear a motor ping.
Another sign of too much advance is if your motor diesels when you shut it off.
 
Joined
Jul 19, 2004
Messages
880
Location
Olympia, WA
I've had the same problem when I don't use premium unleaded gas. It shouldn't be a problem with a 7.8:1 compression ratio but it is. If I back off the timing, the engine runs hotter so It's definitely a trade off.

I run with the stock timing and with premium gas...just the cost of running a cruiser :) .
 

tonkota

 
Joined
Sep 28, 2004
Messages
2,130
Location
Spokane, WA
I have been running premium. The engine was also pinging with low grade.

So, detonation, is just pre-ignition or ignition at the wrong time. I'm good then.

Thanks.
 
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