Re: was broken in after all, knocking was lowering

Posted by buickanddeere on August 13, 2006 at 21:16:10 from (209.240.120.216):

In Reply to: Re: was broken in after all, knocking was lowering posted by Hal/WA on August 13, 2006 at 18:15:55:

As for cooler? Well burning 87 octane and 93 octane in a open burner etc. There is virtually no difference in the btu's or the flame temp.
Now inside an engine is an altogether different kettle of fish. If detonation/knocking/pinging is occuring. Then yes along with the pressure spikes of 2,3 even 4 times higher than normal combustion pressure. Combustion chamber temps are also increased along the shock wave front.
So yes in a round about way. A engine knocking on 87 octane does see higher temps then the same engine not knocking on a higher octane fuel. No if the engine doesn't knock on 87 octane. Then the combustion temps will be identical running on 97 or 94 octane fuel.
Tonight with an air temp of 60F rather than 90F of a few days ago. The mileage was improved a wee bit.
I think I'll install a bypass pipe at the throttle body so engine coolant isn't heating the assembly to 195F.

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