reasons for cracked manifold? - 460 Ford Forum
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post #1 of 23 (permalink) Old 05-19-2011, 12:58 PM Thread Starter
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reasons for cracked manifold?

My left side exhaust manifold (stock cast iron) got a crack down the center of it this morning.

So I guess I'll be buying those fordpowertrain.com headers a little sooner than I had planned....

Just curious as to why this may have happened. Car has 2 1/2" dual exhaust with two rubber-mounted hangers on each pipe; one just ahead of the rear axle, and another at the back just behind the rear bumper. Cherry Bomb glasspacks.

Thanks--

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post #2 of 23 (permalink) Old 05-19-2011, 01:48 PM
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Just time for it to crack, old age.

If you're not living on the edge you're taking up too much space!
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post #3 of 23 (permalink) Old 05-19-2011, 02:17 PM Thread Starter
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I suppose there is no sense in trying to weld it for the time being?

I just dug up my coffee can in the back yard, and it appears the wife has already cleaned it out.

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post #4 of 23 (permalink) Old 05-19-2011, 02:18 PM
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Heating and cooling cycles and cast iron = eventual cracks from metal fatigue.
Rob

Rob Hawes-Anchorage Rod Works-Anchorage, Alaska
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post #5 of 23 (permalink) Old 05-19-2011, 02:28 PM Thread Starter
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Never had a manifold crack before, and when it went this morning, the way that exhaust note changed freaked me out a fair bit.

I was looking at my gauges, looking for blue smoke, looking for an oil slick in my rear view mirror etc etc

It was definitely a "WTF?!?!" moment.

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post #6 of 23 (permalink) Old 05-19-2011, 02:44 PM
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Unless the manifolds are an "irreplaceable" item, replace them. By the time you pay to have them welded or brazed correctly, you've got the price of a new set AND a repaired manifold......metal fatigue...it happens to the whole piece.
Rob

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post #7 of 23 (permalink) Old 05-19-2011, 04:11 PM
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I have a pair of cast iorn I will sell you for $20 for both plus shipping I know you only need 1 but I would like to see both go. Put them on the auction block early last week if you want more info have the numbers there.
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post #8 of 23 (permalink) Old 05-19-2011, 10:23 PM Thread Starter
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Um... yeah.... I'm a frickin' moron.

Manifold is fine. I mustve been cross-eyed today.

What happened is: The asbestos? donut (or whatever-you-call-it) between the manifold and the exhaust pipe just went AWOL. I imagine it got blown out the tailpipe and is lying in a ditch somewhere between my home and work.

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post #9 of 23 (permalink) Old 05-20-2011, 03:22 AM
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LOLOL. Geeeez.....some peoples kids! lol Now see, 'ya coulda' kilt a rabbit or somethin'! Glad it wasn't anything expensive.
Rob

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post #10 of 23 (permalink) Old 05-20-2011, 06:53 AM Thread Starter
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the moderator should delete this post because I am so embarassed.

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post #11 of 23 (permalink) Old 05-20-2011, 09:05 PM
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The Cherry Bomb mufflers probably set up a harmonic vibration that disintegrated the donut.
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post #12 of 23 (permalink) Old 05-21-2011, 08:32 AM
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Correct donut gasket replacement part number= Fel-pro 60201. If you look it up in the catalog, all it gives are 3 different dimensional listings. Don't understand why because there is only 1 size donut gasket for 429/460 manifolds, and it is for the early style like you have. Catalogs are never correct, especially for Ford stuff.

Last edited by 429TORQ; 05-21-2011 at 08:33 AM. Reason: quoted wrong statement
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post #13 of 23 (permalink) Old 05-21-2011, 09:48 AM
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Quote:
Originally Posted by ITSA 91 View Post
The Cherry Bomb mufflers probably set up a harmonic vibration that disintegrated the donut.
Yes, the frequency of resonance of the collector plenum area is equivalent to the tuning frequency of each respective side of the dual exhaust system. The cherry bomb mufflers are inducing a polyphonic reversion wave, further enhancing the self-destruction of the donut gaskets.




p.s. lol
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post #14 of 23 (permalink) Old 05-21-2011, 07:00 PM Thread Starter
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Unreal.

Thanks for the part number. I'll pick some up next week.

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post #15 of 23 (permalink) Old 05-22-2011, 12:14 AM
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Quote:
Originally Posted by 429TORQ View Post
Yes, the frequency of resonance of the collector plenum area is equivalent to the tuning frequency of each respective side of the dual exhaust system. The cherry bomb mufflers are inducing a polyphonic reversion wave, further enhancing the self-destruction of the donut gaskets.




p.s. lol
I said that in a joking manner. Anything is possible, but harmonics contributing to the gasket's failure is almost impossible.
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