Fan belt on BB question
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Joined: Jun 2011
Posts: 61
Likes: 1
From: Louisville KY
Fan belt on BB question
I have a 505 stroker in my 70 with AFR heads and built valvetrain including stud girdles. So that requires tall valve covers and moves my alternator over some requiring a 56" fan belt. No power accessories. Redline is 7400 and that throws off fan belt even with all deep groove pulleys and a .69" x 32 deg belt. Don't want to switch to serpentine. Anybody have an idea on some fix ? A tensionor or ???
Help !
Keith
amg at insightbb.com
Thanks !
Help !
Keith
amg at insightbb.com
Thanks !
1st Gear
Joined: Apr 2013
Posts: 1
Likes: 0
Had the same problem with a 498 in a drag car that is seeing 7500 rpm. I used to throw the alternator belt every pass. After switching to a Moroso 64800 5" dia alternator pulley and a Gates Powerated v belt I haven't thrown a belt. They are green belts that are made for mowers but won't stretch like a normal v belt.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
GM used the captured belt as the upper right diagram shows on the hi performance BB cars. I beleive they used the same setup on the A/Production SCCA cars of the day.
Thread Starter
Advanced
Joined: Jun 2011
Posts: 61
Likes: 1
From: Louisville KY
BB Fan belt
Had the same problem with a 498 in a drag car that is seeing 7500 rpm. I used to throw the alternator belt every pass. After switching to a Moroso 64800 5" dia alternator pulley and a Gates Powerated v belt I haven't thrown a belt. They are green belts that are made for mowers but won't stretch like a normal v belt.
Thanks to everyone for the help !!
Keith
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
You can try those belts with less stretch. But, if that doesn't work, you will likely need 1 or 2 idler wheels on the long {unsupported} run of that belt or some 'guide-shoes' for the backside of the belt in those unsupported areas. For that high RPM stuff, idler wheels would be best.
Le Mans Master
Joined: Nov 2006
Posts: 7,215
Likes: 1
From: Orlando FL
You can try those belts with less stretch. But, if that doesn't work, you will likely need 1 or 2 idler wheels on the long {unsupported} run of that belt or some 'guide-shoes' for the backside of the belt in those unsupported areas. For that high RPM stuff, idler wheels would be best.
or move the alternator to a mid mount that would decrease belt run, my 582 turns 7500 and I don't throw the beltbracket was only about 60 bucks
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