351W dyno rwhp

[blykins]

I've seen 100hp drops from flywheel to rear wheel on Cobras. Sidepipes and drivetrain losses are usually killers.

A good single carb intake and carb package would probably wake that thing up a little bit. It should pull a little higher than 4900, so something is amiss somewhere.

Any signs of valve float at higher rpm? Usually the springs that they put on these heads (especially small heads like a 170) peter out pretty quick.

[Jeff Frigo]

Can this thread be moved to the "Official RWHP Thread" ?

[DAVID GAGNARD]

Not only driveline loss,but don't forget the loss form the water pump/alternator/power steering and anything else belt driven on the front of an engine.........
Years ago, a guy had a 360 Dodge engine on a dyno,this particular dyno didn't have it's own water pump,so the engine had the water pump on it and in this case the alternator also.......when they began making pulls,at about 5000 rpms, it would throw the water pump/alternator belt off everytime, pulleys were not lined up properly.....
On one pull it was noted that there was a 14 hp increase as soon as it hit 5000 rpms and threw the belt!!!!!!!!!!!!!!!!

David

[DAVID GAGNARD]

351W .30 over
Trick flow TW 170 heads
comp cam 508/532lift 222/232dur
dual quad edelbrock 500cfms
MSD ignition on a 6AL
Timing at 34 total advance

Based on the limited info,I'm comparing this engine to another 351-W I know of with very similar specs, dynoed at around 325 HP at the flywheel......assuming your engine makes 325 hp at the crank and it made 280 at the rear wheels, that is a 13% loss,which would be outstanding......
I'd say for what you have,those numbers are in the correct ballpark..
Switching to an air gap dual intake and 600/650 double pumper and a good tune, I'd bet another 20 to 35 hp would be possible....

David