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Author Topic:   Pinion angle
Hans olsson
Gearhead

Posts: 622
From: Sweden
Registered: Apr 2000

posted 02-03-2001 12:58 PM     Click Here to See the Profile for Hans olsson   Click Here to Email Hans olsson     Edit/Delete Message   Reply w/Quote
Hey its me again! Whats the big deal about pinion angle,how much is right and what happens when you change it ? Our car has a best of 1.59s 60 foot and 11.92 et . We use a C4 trans and calvert style bars.Hans

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-71 351c Mustang E/SA 11.92-110 mph, more to come!!

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Moneymaker
Administrator

Posts: 25883
From: Lyons, IL, USA
Registered: May 99

posted 02-03-2001 01:02 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Hello again Hans. I will send you a detailed e-mail about possibly racing in the USA this year later today. Pinion angle is critical so as not to have any "binding" in the u-joints of the drive shaft. This leads to less rolling resistance. Most automatic drag cars like 1.5 to 3 degrees.

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Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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TomP
Gearhead

Posts: 5761
From: Delta BC Canada
Registered: Dec 99

posted 02-03-2001 01:43 PM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
Hans

even tho my car has welded-on Thunderbolt style traction bars that can't allow pinion angle change,i still have the pinion tipped down a couple degrees... it plants the tires harder and tries to lift the back end to straighten it.

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Hans olsson
Gearhead

Posts: 622
From: Sweden
Registered: Apr 2000

posted 04-22-2001 01:13 PM     Click Here to See the Profile for Hans olsson   Click Here to Email Hans olsson     Edit/Delete Message   Reply w/Quote
At last, i measured the angle to 1.5 deg. Could we benefit from 3 deg pinion angle,or is the change to small to notice? I assume that i should measure the difference in angle between the driveshaft and the pinion. Hans

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-71 351c Mustang E/SA 11.92-110 mph.
-87 volvo daily driver.

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Moneymaker
Administrator

Posts: 25883
From: Lyons, IL, USA
Registered: May 99

posted 04-23-2001 05:53 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Yes Hans, you can benifit dramatically in your 60 foot times by changing it to 3 degrees or better.

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Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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Rustang
Gearhead

Posts: 733
From: Clarion PA
Registered: Nov 2000

posted 04-23-2001 10:34 PM     Click Here to See the Profile for Rustang   Click Here to Email Rustang     Edit/Delete Message   Reply w/Quote
I've never fully understood the mechanics of pinion angle. Does having the pinion angle down have some effect on leverage(lift) on the body? I've heard racer's claim more pinion angle provides a harder hit off the line.
Or is it simply a matter of having a more efficient transfer of power thru the dshaft assembly when the pinion is close to zero when torque is applied? I've never seen a complete explanation on why this works!

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