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Kirkham Motorsports

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  #21 (permalink)  
Old 01-07-2019, 12:55 PM
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Gary,

Should have been clear, that the car was running in 1st thru 5th, (first thought was a trans failure). We have drive to the rear-end and only to the Left wheel.

Mark.
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  #22 (permalink)  
Old 01-07-2019, 04:12 PM
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Originally Posted by Moto One View Post
Gary,

Should have been clear, that the car was running in 1st thru 5th, (first thought was a trans failure). We have drive to the rear-end and only to the Left wheel.

Mark.
So that's on a hoist isn't it, and yet no drive on the ground?

What diff assembly do you have in this?

Gary
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  #23 (permalink)  
Old 01-08-2019, 03:16 PM
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Gary, it has a ZF unit that is the same as the late model IRS Camaro, 0012 (our car) is only a year old this coming June.
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  #24 (permalink)  
Old 01-08-2019, 10:23 PM
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So while the left rear was turning on the hoist, was it positive drive, or just rolling along with the tailshaft?

Are both rear axles intact, since everything external to the diff is an easy visual diagnosis?

How much power are you putting through this diff?

Gary

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  #25 (permalink)  
Old 01-09-2019, 05:49 AM
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Gary,

Good questions. I have seen a car up on jag stands where a wheel was spinning due to the inertia of the driveshaft spinning, and you could stop the wheel by just touching she sidewalk with your hand.

Jim
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  #26 (permalink)  
Old 01-09-2019, 07:46 AM
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Jim and Gary, When up in the air, only the left turns, right is motionless and can freely turned in both direction will the left is turning.
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  #27 (permalink)  
Old 01-10-2019, 05:32 AM
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Jim and Gary, When up in the air, only the left turns, right is motionless and can freely turned in both direction will the left is turning.
Can you stop the left wheel while the tailshaft is spinning, engine running?

This has to be a broken diff.

Gary
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  #28 (permalink)  
Old 01-10-2019, 05:45 AM
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Originally Posted by Gaz64 View Post
Can you stop the left wheel while the tailshaft is spinning, engine running?

This has to be a broken diff.

Gary
Different style rear end, but that is exactly what my Jag rear did when I snapped the stub axle. It broke inside the carrier right where the axle entered the LSD unit. I even drove the car a few miles as the LSD unit was tight enough to allow me to run on just the one side as long as you didn't give it too much gas and eased out the clutch. When I put it on the lift, it did exactly as Moto One is describing.
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  #29 (permalink)  
Old 01-10-2019, 07:10 AM
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Why haven't you taken the cover off and just look what's going on? That's what I would do
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  #30 (permalink)  
Old 01-10-2019, 08:47 AM
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Why haven't you taken the cover off and just look what's going on? That's what I would do
Nope, that's against the rules. You have to diagnose the problem through purely non-invasive methods. Just like figuring out what's wrong with your valve train but without removing the valve covers. It's way more fun that way and you're less likely to have a spider gear or broken tip of a stub axle fall out on your toe.
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  #31 (permalink)  
Old 01-10-2019, 09:08 AM
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We have never had an issue with one of the ZF diffs and have people with MKIII (427 type) chassis putting 700HP and more through them. Very possibly a defective unit as the FIA Moto One is working on likely much less HP and torque.
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  #32 (permalink)  
Old 01-11-2019, 08:22 AM
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Mark IV, I'll have you know we have plenty of power, Ok maybe it's only adequate. We are in the 450/400 range 363 Ford Racing, with 8 stack injection. Plenty enough. :-)

Mark.
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Old 01-11-2019, 09:47 AM
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Its been 2 weeks------------next race is in 20 minutes
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