Mixing plugs ? - Team Camaro Tech
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post #1 of 3 (permalink) Old Mar 12th, 10, 02:49 PM Thread Starter
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Peter
 
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Mixing plugs ?

I always have 2 plugs running richer than the rest. They fuel up after a long idle periods but clear after a decent blast. The question is it acceptable to run hotter plugs on just these cylinders only ?
Can you mix heat ranges on a engine ? Any down side ??

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post #2 of 3 (permalink) Old Mar 12th, 10, 02:55 PM
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John
 
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Wink Re: Mixing plugs ?

Yes, we used to tune some engines with different ranges as needed.
BUT, there may be a reason those two cylinders are 'richer' also
Are they #5 & 7 ???

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post #3 of 3 (permalink) Old Mar 12th, 10, 08:20 PM
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Steps
 
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Re: Mixing plugs ?

Like john above..
If it is 5 and 7 look at your HT lead condition these are prone to cross fire if too close together and in bad condition

If it is the cnr pots, in partucular the front cnrs, this is normal as the longer runners cause the issue...and it usually happens because you are using a heat range low as possible..which is the correct thing to do.

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