AChotrod

iTrader: (17)

Just wondering if the weight of the Street twin actually causes a HP/TQ loss to the rear tires on the dyno.
Seems ever since I put this clutch in the car has dynoed about 8.5hp/6rwtq less than b4.
Anyone have a clue if this it true. Also what is the weight difference between stock and a Street twin.
Thanks

wrd1972

iTrader: (12)

I dont see that clutch robbing that much power.

AChotrod

iTrader: (17)

lol! ever pick one up? Its quite the massive pc.

AChotrod

iTrader: (17)

Qouted from Billy at Mcleod
The LT street twin with steel flywheel is around 55 lbs. The RST for the LS based motors is around 21.5 lbs minus the flywheel. A single disc application is in the 35-40 lbs range.

Billy M

If your only losing 8.5hp/6rwtq from what the motor is making at the crank, your doing damn good. Most people see allot more loss than that. You will lose more power using a steel flywheel as opposed to a aluminum flywheel due to reciprocating mass is greater with a steel flywheel. Rule of thumb is steel flywheels come in around 28-32 lbs and Aluminum flyweels come in at 10-15 lbs depending how much mill work has been done to the wheel for lighting purposes.

AChotrod

iTrader: (17)

Numbers were RWHP/TQ but what your saying its the clutch. Thats fine since Im gonna spray the car and wanted the best clutch possible. Just was wondering if I should start looking other places for the lost power. I know its like 20 extra pounds on the crank wich lead me to believe thats what was goin on.