Re: IML: Manifold Leak 64 413

["JAY D'ANGELO" <cadij@xxxxxxxxxxx>]

The intake manifold is white on the left side right in the middle.  I use 91 
octane, the timing is set at 10 degrees and the car runs great.  I will have 
to check the vacuum and the other things you mentioned.  I have not noticed 
anything unusual about the exhaust manifolds.  I'll have the mechanic take a 
look next week.

Thanks,

jay

Let's get this right -- the INTAKE manifold was white from heat?

What's your vacuum reading at idle?  What's your initial spark advance?  
What kind of fuel are you using?

Excessive heat in the combustion chambers is generally caused by running 
lean, not enough spark advance and/or octane too low for your engine.  An 
intake manifold leak would contribute to a lean condition in one or more 
adjacent cylinders.

The other thing to look at is your spark plug heat range, but check that by 
reading a set of new plugs after you have addressed the other possibilities.

Lastly, and least likely, your valve timing is off far enough that the 
intake valve is partially open during combustion, allowing the burning 
mixture to expand into the intake.

How are your exhaust manifolds doing?  Glowing red?  Next time you remove 
them (ha ha ha) you may find that the surface where they mate to the heads 
is rough and pitted from excess heat.  This can also be checked by a shop 
that will measure your exhaust gas temps and use infrared to detect hot 
spots under the hood.



Happy motoring,

David

'91 K-Imperial driver
'66 Crown Coupe project
'66 LeBaron dual air and every option known to man

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