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07-18-2012, 11:26 AM | #1 |
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Join Date: May 2010
Location: McPherson, KS
Posts: 197
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Exhaust/Intake leak(s)
I asked this on the HAMB, but since it's about an almost-stock car I haven't received any replies. This 1931 coupe is my daily driver/commuter car, which I put between 500 and 600 miles a month on.
The car has a set of Reds headers and a Weber carb on a cast aluminum intake manifold on the otherwise stock motor. I keep getting exhaust/intake leaks that I can't seem to permanently cure. I've replaced both sets of gaskets and torqued the manifold nuts to 30 ft/lbs and everything's fine for a couple hundred miles or so, but then the leak comes back and I get acceleration/deceleration popping again. Things I've tried: - Permatex copper spray on the gaskets - Switching between the copper vs. steel gaskets Still no joy. My sort-of guess is that the weight of the Weber, cast al intake, and headers is too much for the manifold studs/nuts to hold and that I need to do something to hang more of that weight off the frame... Any advice from someone with a similar setup? |
07-18-2012, 11:46 AM | #2 |
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Location: Crete, Illinois
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Re: Exhaust/Intake leak(s)
The original exhaust and intake, with carb, I'm sure weights more than what you have on there now. It sounds to me like your not tighting them enough. I would re torque several times.
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07-18-2012, 11:49 AM | #3 |
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Join Date: May 2010
Location: McPherson, KS
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Re: Exhaust/Intake leak(s)
Thanks. Do you think I should go higher than 30 ft/lbs? I'm afraid I'm going to pull the studs out if I really crank it (to say 50)
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07-18-2012, 12:09 PM | #4 |
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Join Date: May 2010
Location: So Cal
Posts: 8,766
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Re: Exhaust/Intake leak(s)
You are probably doing it wrong, check out the video that [email protected] posted.
http://www.fordbarn.com/forum/showthread.php?t=77141 Bob |
07-18-2012, 04:10 PM | #5 |
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Join Date: May 2012
Location: Mo. City , Texas
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Re: Exhaust/Intake leak(s)
May need to mill the manifolds to make sure they are flat .
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07-18-2012, 05:28 PM | #6 |
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Location: Crete, Illinois
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Re: Exhaust/Intake leak(s)
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07-18-2012, 10:33 PM | #7 |
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Join Date: Jun 2010
Location: Danvers, Ma.
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Re: Exhaust/Intake leak(s)
Dan, are you using the old style thick, concave manifold washers? Are you certain you're getting an even amount of torque to all points of the manifolds? I may have mis- understood something with the modified set-up you have, I can't quite picture it since I only run stock A's. No big deal.
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07-18-2012, 10:58 PM | #8 |
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Join Date: May 2010
Location: Santee, California
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Re: Exhaust/Intake leak(s)
In my opinion you are not tightening enough. Go the 50 ft lbs. Like ford fixer said, they are the same size studs as the head.
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07-19-2012, 12:46 AM | #9 | |
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Location: FRESNO, CA
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Re: Exhaust/Intake leak(s)
Quote:
When I post that I ALWAYS torque mine to 55 ft lbs, folks come out of he woodwork & YELL at me. After 3 re-torques, mine never leaks & never loosens up!-----But what do I know?? Bill W.
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07-19-2012, 12:51 AM | #10 |
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Location: brentwood, ca
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Re: Exhaust/Intake leak(s)
Try double gaskets and 55 lbs. That is what i have seen used for your setup. Bob
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