Re: IML: Manifold Leak 64 413

[James carter <zatoichi1964@xxxxxxxxxxxxx>]

i had that problem. there is a flap in heat riser on mine that rusted shut. kind of like a choke on the carb. this causes the manifold to develop cracks. better than warping the head.

 

 

 

James

JAY D'ANGELO <cadij@xxxxxxxxxxx> wrote:

> 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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