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11-03-2019, 06:31 PM | #1 |
Member
Join Date: Aug 2019
Location: Eden Prairie, MN
Posts: 37
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High-pitch whistle when accelerating
Hey folks...newbie here. My '29 Model A makes a high pitch whistling noise when I am accelerating in 3rd gear. It doesn't ALWAYS happen, and it doesn't have anything to do with speed. It comes in and out as I put pressure on the accelerator, then will fade when I coast. Anyone have this weird thing happen?
Chris |
11-03-2019, 07:33 PM | #2 |
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Join Date: May 2010
Location: Clinton,WA/Whidbey Island
Posts: 4,104
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Re: High-pitch whistle when accelerating
Welcome!! Could be the carbwhistling?
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11-03-2019, 08:01 PM | #3 | |
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Join Date: May 2010
Location: Young Harris, GA
Posts: 1,819
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Re: High-pitch whistle when accelerating
Quote:
I have heard leaking exhaust manifold gaskets whistle, but instead of coming and going with throttle position, they usually get worse with RPM increase. I have heard intake manifold to carb gaskets whistle, but they usually get worse when you are at speed and you take your foot off the throttle (intake manifold vacuum really shoots up). Whistles that get worse with more load on the engine (open throttle more in 3rd gear) are often a head gasket going bad. The high pressure gases squirting out though the gasket make the noise. So I'd say check the head gasket. Check for combustion gases in the coolant. Do a compression test. Good luck.
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Jim Cannon Former MAFCA Technical Director "Have a Model A day!" |
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11-03-2019, 09:13 PM | #4 |
Member
Join Date: Aug 2019
Location: Eden Prairie, MN
Posts: 37
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Re: High-pitch whistle when accelerating
Thanks, guys! Here's the interesting thing. The whistle happens for a while, but then when I get to high speeds they cease. And it definitely happens when I accelerate. Hmmm...
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11-03-2019, 09:30 PM | #5 |
Senior Member
Join Date: May 2010
Location: Hebron, CT
Posts: 432
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Re: High-pitch whistle when accelerating
Try retorquing the head (50-55 #-ft) cold and the 4 exhaust manifold bolts.
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11-04-2019, 07:22 AM | #6 |
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Join Date: May 2010
Location: Gwynn's Island Va
Posts: 1,386
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Re: High-pitch whistle when accelerating
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11-04-2019, 07:47 AM | #7 |
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Join Date: May 2011
Location: Elyria, Ohio
Posts: 756
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Re: High-pitch whistle when accelerating
A friend had this happen when he had a bad gasket between the exhaust manifold and the carb. Easy fix.
Marty |
11-04-2019, 07:49 AM | #8 |
Senior Member
Join Date: May 2011
Location: Elyria, Ohio
Posts: 756
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Re: High-pitch whistle when accelerating
Sorry, that should have been between the INTAKE manifold and the carb.
Marty |
11-04-2019, 11:34 AM | #9 |
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Join Date: Dec 2014
Location: Shawnee, Ok
Posts: 3,471
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Re: High-pitch whistle when accelerating
Can you identify the tune the car is whistling ?
"Please excuse my exhaust " by Fatman Blue and the oyster chokers "I can't intake you anymore" by Ben Dover and the Screamers "Head below my feet" by the Young Eunuchs "Don't eat the carbs" by Fishing with bricks
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Keith Shawnee OK '31 SW 160-B |
11-04-2019, 02:01 PM | #10 |
Member
Join Date: Aug 2019
Location: Eden Prairie, MN
Posts: 37
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Re: High-pitch whistle when accelerating
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11-04-2019, 03:28 PM | #11 |
Senior Member
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Re: High-pitch whistle when accelerating
The book says 45, but that's wrong. Get up to 35 and you should be good.
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11-04-2019, 04:07 PM | #12 |
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Join Date: May 2010
Location: Jordan, MN
Posts: 1,411
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Re: High-pitch whistle when accelerating
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11-04-2019, 09:07 PM | #13 |
Member
Join Date: Aug 2019
Location: Eden Prairie, MN
Posts: 37
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Re: High-pitch whistle when accelerating
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11-05-2019, 02:36 PM | #14 |
Senior Member
Join Date: Mar 2014
Location: Midland Park,N.J.
Posts: 1,108
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Re: High-pitch whistle when accelerating
Might be the police officer behind you,A sense of humor is a necessity when you own a model A,hope you solve the problem.
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