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#21
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Quote:
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"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ |
#22
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If it's at exactly the same rpm I'd bet it some kind of belt flutter or resonance that effectively loosens the belt temporarily. Possibly a pulley ever so slightly out of round or eccentric on it's shaft.
I've always wanted a (pretty expensive) variable strobe light for watching things go wonky when they are moving fast. If it's some kind of resonance problem then changing the tension on the belt should shift the rpm where it happens. I guess the other solution might be the fan clutch doing something unusual at that specific rpm which cause it to dump a big load on the belt (figuratively speaking of course)
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I'm World's Best Hyperbolist !! |
#23
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Hook your timing light to the coil wire, strobe!
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize. 1977 Trans Am W72 400, TH350, 3.23 T Top Everyone you will ever meet knows something you don't. Bill Nye. |
The Following User Says Thank You to TedRamAirII For This Useful Post: | ||
#24
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So, haven't had time to get over to the the shop until last night. Checked pulleys with straight edge and they look pretty good to me. I then removed the fan and fan clutch and tossed the belts back on, lo and behold no squeal.
So I learned my lesson about the SD clutch a while back (due to all the time loudness, not the squeal) and put a HD clutch on my firebird. I may swap that onto my lemans and see if it still squeals. Appreciate all the help!
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1966 Lemans convertible 455/5spd 1968 Firebird convertible 400/4spd Need more Pontiacs! |
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