<VV> Crank breakage.

[levair at aol.com]

I have finally broken my first crankshaft in 40 years of track , autocross and drag racing. 

This particular crank has been in a mid engined, Emod car for nearly 10 years. 

  This engine is a 3100 cc that has been Paxton supercharged, turbocharged, and Rootes Supercharged. 

  I believe that the final straw was the change to 15 x 13”  rear wheels, 11.5 wide tires in the softest R 25 A compound. It sure had a lot of grip!!!—Apparently enough to break this old,old crank. 

No it did not have a harmonic balancer—I needed the pulley to drive the blowers.

  The crank broke at the # 6 rod journal.

   I just got around to doing the autopsy; I broke it just before the Corvair  Olympix.

 

 

   On another note, I just finished a weekend in the  CP Stinger at the Solo Divisional Championships at Grissom AFB. 

   Grissom is a huge expanse of very grippy concrete. 

  My  2700cc SCCA legal carbureted  6 tube (Q-jet) , 6= 1, 1 ½” exh, 310 cam, ran perfectly at the 6800 rev limit, the car handled very well and by all reports, I drove fairly well.

   I was hopelessly out of contention. You just can’t compete with CP cars that can put all of their 500 HP down on the high friction long flowing courses. And  the car weighed 1880# after running with a passenger seat and 6 gal of fuel. 

    I had fun, but I just absolutely mu
st have another 100 HP to stay in the game. It’s either a grenade type turbo or getting the Emod car running and switching classes.. 

 

Warren