Do you have AC and/or power steering? Those belts love to slip and make noise, especially the AC belt.
Engine "chirping" noise
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 877
Likes: 59
From: Minneapolis, MN USA
Engine "chirping" noise
Hi all,
I have a 1970 with the 350/350. It has a Holley 650 DP carb and an Edelbrock Torker intake and a non-stock cam (don't know what it is, previous owner did it). At ~3000 RPM, the engine makes a loud high-pitch "chirping" noise. Is this the noise of the secondaries opening up? Is that common? When I pull the throttle by hand (removed the air cleaner), I don't notice this sound...but when I'm driving, it is very clear. Could there be something wrong, or is this normal?
I have a 1970 with the 350/350. It has a Holley 650 DP carb and an Edelbrock Torker intake and a non-stock cam (don't know what it is, previous owner did it). At ~3000 RPM, the engine makes a loud high-pitch "chirping" noise. Is this the noise of the secondaries opening up? Is that common? When I pull the throttle by hand (removed the air cleaner), I don't notice this sound...but when I'm driving, it is very clear. Could there be something wrong, or is this normal?
Race Director
Joined: Oct 2000
Posts: 12,639
Likes: 3,102
From: Shamong, NJ
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 877
Likes: 59
From: Minneapolis, MN USA
I have power steering, but no A/C. I'm not sure how old the belts are...prolly at least 5 years, but almost no miles in the past 5 years. Would it make sense that it only makes that noise at higher RPMs? When I first started driving it today, it would start making the noise at 2900-3000 RPM...after a little while, it would not start making the noise until ~3500-4000 RPM, don't recall exact number, but it was definitely a higher RPM.
Melting Slicks
Joined: Apr 2009
Posts: 2,632
Likes: 112
From: Great Plains Iowa
Hi all,
I have a 1970 with the 350/350. It has a Holley 650 DP carb and an Edelbrock Torker intake and a non-stock cam (don't know what it is, previous owner did it). At ~3000 RPM, the engine makes a loud high-pitch "chirping" noise. Is this the noise of the secondaries opening up? Is that common? When I pull the throttle by hand (removed the air cleaner), I don't notice this sound...but when I'm driving, it is very clear. Could there be something wrong, or is this normal?
I have a 1970 with the 350/350. It has a Holley 650 DP carb and an Edelbrock Torker intake and a non-stock cam (don't know what it is, previous owner did it). At ~3000 RPM, the engine makes a loud high-pitch "chirping" noise. Is this the noise of the secondaries opening up? Is that common? When I pull the throttle by hand (removed the air cleaner), I don't notice this sound...but when I'm driving, it is very clear. Could there be something wrong, or is this normal?
As you're running a track-racing carburetor your secondaries open up at full throttle regardless of what road speed you're running or how fast you're spinning it. A loud high-pitched "chirping" would indicate a slipping alternator belt.
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 877
Likes: 59
From: Minneapolis, MN USA
Thanks guys - sounds like I should just replace the alternator belt. I'm sure this is an easy task - can anyone point me to a video or good "how to" post on how to do it properly?
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 877
Likes: 59
From: Minneapolis, MN USA
Based on your comments above, I tool a look at my belts and was surprised to see my alternator belt is touching/rubbing on the front of the power steering pump! Could this be part of the issue? But again, I ask why only at higher rpms? I tried to get a picture of it. The first picture is zoomed out to give perspective...the second picture is trying to show closer up:
It appears I can take tension off the alternator belt by loosening one of the alternator mounting bolts and then sliding it along that bracket. But how do I take tension off the power steering pump belt (the one closest to the fan) to replace that?
It appears I can take tension off the alternator belt by loosening one of the alternator mounting bolts and then sliding it along that bracket. But how do I take tension off the power steering pump belt (the one closest to the fan) to replace that?
Last edited by Mpls Funk; Jul 20, 2015 at 10:17 AM.
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