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08-09-2018, 07:46 PM | #1 |
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Rapping exhaust
Hi guys
When I 1st bought the 52 F1 (all stock v8), it use to rap / backfire through the exhaust, when backing off on gas. I did a tune up about 3 months ago, adjusted timing and it stopped. At the same time I installed a new carb. Tonight it started again, only when coming off the gas. When at idle it seems like the idle is too slow. Now I have (I am guessing) two options: 1) check timing 2) turn carb idle screw up. Which would you go for first?
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08-09-2018, 07:58 PM | #2 |
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Location: Minnesota
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Re: Rapping exhaust
It doesn't matter. I'd start with idle. Then time it.
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08-09-2018, 08:02 PM | #3 |
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Re: Rapping exhaust
Timing affects the idle speed, but idle speed should be correct to time correctly. You might have to re-adjust idle after timing. IMHO
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08-09-2018, 08:13 PM | #4 |
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Re: Rapping exhaust
If you were a teenager in the fifties, you lived for that backfire sound. Don't be an old fogie!
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08-09-2018, 08:15 PM | #5 |
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Re: Rapping exhaust
That's what I was thinking! I had a big engine mustang with very short pipes that would back down and shoot fire out of both sides under the doors. Boy did I think that was cool.
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08-10-2018, 07:48 AM | #6 |
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Re: Rapping exhaust
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08-10-2018, 08:13 AM | #7 | |
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Re: Rapping exhaust
Quote:
Dick. |
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08-11-2018, 12:17 PM | #8 |
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Re: Rapping exhaust
Flathead rapping is a beautiful thing. Why would you want to stop it???
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08-11-2018, 01:09 PM | #9 |
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Re: Rapping exhaust
Simple. My wife doesn’t like it and I’m afraid of her.
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08-11-2018, 08:11 PM | #10 |
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Re: Rapping exhaust
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08-11-2018, 08:34 PM | #11 |
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Re: Rapping exhaust
If you don't like it. Change it.
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08-12-2018, 12:07 AM | #12 |
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Re: Rapping exhaust
i had a 350 chebby that would do the same thing i'm 51 and i still think its kool!
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08-12-2018, 04:36 AM | #13 |
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Re: Rapping exhaust
its just part of real motoring the 3 'Cs' [cams carbs compression] or as we say here NBC [no blo''' computers ] so embrace and enjoy
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08-12-2018, 10:31 AM | #14 |
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Re: Rapping exhaust
Checked points, rotor and distro cap all looked good. Pulled plugs and they all looked a lil sooty. Cleaned, re-gapped and installed. Adjusted fuel mixture and idle is now nice smooth and truck starts and a quick hit of button.
Took for ride was still backfiring out exhaust when de-acceleration. Shut truck off did couple errands and now it’s not backfiring on de-acceleration. Could it be condenser going bad? Could it be Electical?
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08-12-2018, 01:34 PM | #15 |
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Re: Rapping exhaust
Andy, this is a long shot-are the carburetor mounting nuts snug? Sometimes a small vacuum leak will cause a backfire. May want to hook up a vacuum gauge and see what the readings are.
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08-12-2018, 02:29 PM | #16 |
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Re: Rapping exhaust
Steve
Thanks. I just checked and the back carb nut took a qtr turn. I’ll drive it this week and see if this inconsistent back fire returns.
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08-12-2018, 02:42 PM | #17 |
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Re: Rapping exhaust
Even though I never had one I love the sound of the old Chevy 6's with
twice pipes. https://www.youtube.com/watch?v=kVvtPCyo1-M Bob |
08-12-2018, 08:21 PM | #18 |
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Re: Rapping exhaust
I think that I've been on Face Book to much lately...I kept looking for the "like" button on a lot of those comments. Ha Ha....I love the sound of my Flatty rapping too. going to be even better when I'm able to switch over to straight pipes!
Randy |
08-17-2018, 09:55 AM | #19 |
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Re: Rapping exhaust
That back carb nut being a lil loose may have been it. Took truck out few times no popping on deacceleration. Thanks Steve and rest!
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08-17-2018, 10:08 AM | #20 |
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Re: Rapping exhaust
Are you gonna try to lean it out again to see if you can make the rapping come back at will? Jack E/NJ
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