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Original Message

octane may be the culprit

By Greg Westphall - 08/05/2005 12:48:04 PM; IP 12.158.13.35

If your engine is nearly stock (camshaft, compression ratio, cast iron cylinder heads, etc) it will have a tendency to run on (diesel) if your octane level sinks to low. On a hot engine, the cylinder pressure alone coupled with a hot spot in the combustion chamber causes the engine to run on after the ignition is turned off. If this has never happened to you in the past and you haven't changed anything, more than likely, you got a bad tank of gas with low octane in it. It will have a tendency to ignite easier under those conditions. In the later 70's cars were equyipped with anti dieseling solenoids which closed the carb throttle plate completely to avoid this problem due to the lower octane of the fuel being supplied.
Hope this helps,
Greg

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Collapse <a href=../ForumFE/reply.aspx?ID=25458&Reply=25458><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor25458" onclick="return false;">Engine Runs On ...</a> -- <font color=#0000ff>John, <i>08/03/2005</i></font><script type="text/javascript">
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Engine Runs On ... -- John, 08/03/2005

Collapse <a href=../ForumFE/reply.aspx?ID=25462&Reply=25458><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor25462" onclick="return false;">Another Clue ...</a> -- <font color=#0000ff>John, <i>08/03/2005</i></font><script type="text/javascript">
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Another Clue ... -- John, 08/03/2005

RE: Another Clue ... -- walt, 08/05/2005

Collapse <a href=../ForumFE/reply.aspx?ID=25463&Reply=25458><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor25463" onclick="return false;">I'd consider scoping the engine & bay for operating temps. [n/m]</a> -- <font color=#0000ff>Mr F, <i>08/04/2005</i></font><script type="text/javascript">
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I'd consider scoping the engine & bay for operating temps. [n/m] -- Mr F, 08/04/2005

Collapse <b>octane may be the culprit</b> -- <font color=#0000ff>Greg Westphall, <i>08/05/2005</i></font>

octane may be the culprit -- Greg Westphall, 08/05/2005

Collapse <a href=../ForumFE/reply.aspx?ID=25487&Reply=25458><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor25487" onclick="return false;">RE: octane may be the culprit</a> -- <font color=#0000ff>John, <i>08/05/2005</i></font><script type="text/javascript">
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RE: octane may be the culprit -- John, 08/05/2005

RE: octane may be the culprit -- walt, 08/05/2005

RE: Engine Runs On ... -- Dano, 08/05/2005