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Author
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Topic: Pinion Angle ・ Splitting Hairs
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jeffstar
Gearhead Posts: 161
From: Toronto, Ontario, Canada
Registered: Feb 2003
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posted 05-31-2006 11:57 PM
 
I am preparing to adjust the pinion angle on my mostly street driven 65 Mustang (leaf spring). If I understand the various articles I have read, it seems this will be an exercise in compromise. Can the experts please either confirm or correct the following:- For optimal high-speed freeway use, the pinion angle should be < 3 degrees (nose down W.R.T. the driveshaft angle) - For optimal drag race use, the pinion angle should be 5-7 degrees (nose down W.R.T. the driveshaft angle) - Angles of > 3 degrees should be avoided for street use, because they will likely cause a noticeable vibration at some freeway speed.
If I set the pinion angle to say 3 degrees (nose down W.R.T. the driveshaft angle), what effect will the missing 2-4 degrees (from optimum) have on drag strip performance???
- Is this mostly an efficiency issue, i.e. minimal angle possible yields least losses. If this is so, any idea how what kind of losses (%) occur when you have a 2-4 degree error?
Or - Is this mostly a traction issue, If this is so, how does pinion angle effect traction?
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65 Mustang fastback
Stroked 351W, G-Force 5spd
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Darryl Eichenlaub
Gearhead Posts: 124
From: Buckley,Wa.
Registered: Dec 2005
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posted 06-01-2006 09:39 AM
I'm no expert but I play one on the internet. I think this exercise has more to do with driveline life and vibration. What the pinion angle should be is what the angle the motor and tranny is. Measure the output shaft of the tranny. If it's 3 degrees down then the axle should be 3 degrees up. You can try and give a couple degrees for axle wrap (pre load) if no traction devises are being used.------------------
Darryl Eichenlaub
1965 Mustang Coupe restomod 289,c4,body and interior mods.
1956 F-100 460,c6,9" major body mods, on going project.
1967 Mustang Fastback, father/son project 5.0,5spd,9".
1975 F250 4x4 Highboy 390,4spd,35",custom paint.
2002 Mustang v6,5spd, daughters college ride.
2001 Ford Escape, Wifes grocery getter.
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