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Author Topic:   Pinion Angle Clarification
afret
Gearhead

Posts: 180
From: Lancaster, CA
Registered: Feb 2003

posted 03-10-2003 05:09 PM     Click Here to See the Profile for afret   Click Here to Email afret     Edit/Delete Message   Reply w/Quote
I recall reading an earlier thread where Alex stated that an auto car worked well with about 2-3 negative degrees on the pinion. This is relative to the angle of the trans output shaft, right? If my output shaft is pointed 3 degrees down, then my pinion should be at 0 degrees or 1 degree up. Is this right? Don't you want the 2 close to parallel under power? Thanks.

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 03-10-2003 10:18 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Yes, you've got the idea.

But the angle depends on the type traction bar and the spacing you leave between the snubber and the leaf spring. I use a negative 5* angl on the '66 with loose slappers.

SteveW

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afret
Gearhead

Posts: 180
From: Lancaster, CA
Registered: Feb 2003

posted 03-11-2003 12:30 PM     Click Here to See the Profile for afret   Click Here to Email afret     Edit/Delete Message   Reply w/Quote
Thanks Steve. I have Caltracs so I figure 2-3 negative should work ok.

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 03-11-2003 11:26 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
You're welcome,

What you don't want to happen is for the pinion angle to rise above 0* under acceleration. You want the pinion to climb the ring gear and not go over the top.

SteveW

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