high performance driveshafts
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Re: high performance driveshafts (scorp508)
as I said scorp, there are many factors that can contribute to PRE-mature failures. We used to do fatigue testing at PSU all the time where you would tortionally load a member, record the load it took. Use a pin to put a small divot, and do the same test. Readings were 1/2 the prior test.
While these occurances do happen with people ruining these 1/2 shafts, Corky and I ran ours all last year, 100+ passes with our setup and had zero issues, jeb ran his down to 1.3 60' times on the juice, I tend to believe they are ALOT tougher than 300rwhp cars are going to dish out.
When a failure does occure, I can almost assure you there was a root cause which was not fully induced by motor torque alone. There is no way a 300rwhp car alone is going to ruin a defect free 1/2shaft on one of these cars.
I check mine before every race thoughly, and even went as far as painting a straight line on them to detect twisting, and very saw any signs.
Its like everything else, thing tend to get over stated. :yawn:
While these occurances do happen with people ruining these 1/2 shafts, Corky and I ran ours all last year, 100+ passes with our setup and had zero issues, jeb ran his down to 1.3 60' times on the juice, I tend to believe they are ALOT tougher than 300rwhp cars are going to dish out.
When a failure does occure, I can almost assure you there was a root cause which was not fully induced by motor torque alone. There is no way a 300rwhp car alone is going to ruin a defect free 1/2shaft on one of these cars.
I check mine before every race thoughly, and even went as far as painting a straight line on them to detect twisting, and very saw any signs.
Its like everything else, thing tend to get over stated. :yawn:
Pro
Joined: Apr 2003
Posts: 603
Likes: 0
From: Atlanta
Re: high performance driveshafts (vader86)
[QUOTE]
However, if its not smaller in radius than the stocker by the right amount, its not going to free up any HP, if its too big its going to cost a few. There are two components to rotational inertia, mass and radius and you need to reduce the whole quantity to get HP back.
QUOTE]
:iagree:
Yep. Some guys have even "lost" horsepower by switching to larger brakes and/or wheels. Even if the components weigh the same as OE , you can loose power if that weight is spread further away from the center of rotation.
:yesnod:
[Modified by BlackBeast2, 2:12 PM 4/2/2004]
However, if its not smaller in radius than the stocker by the right amount, its not going to free up any HP, if its too big its going to cost a few. There are two components to rotational inertia, mass and radius and you need to reduce the whole quantity to get HP back.
QUOTE]
:iagree:
Yep. Some guys have even "lost" horsepower by switching to larger brakes and/or wheels. Even if the components weigh the same as OE , you can loose power if that weight is spread further away from the center of rotation.
:yesnod:
[Modified by BlackBeast2, 2:12 PM 4/2/2004]
Racer
Joined: Feb 2003
Posts: 440
Likes: 6
From: aumsville oregon
Re: high performance driveshafts (scorp508)
I have twisted three full sets of half shafts with my car being a stick shift. Every time i twisted both at the same time. I think with a auto it must be easier on them .
