with 322 hp at the rears, its more like 431 hp at the flywheel,
rear wheel horse power is basically what your engine makes in kilo watt,
322 x 1.34 = 431.48hp,
i engine dynoed a 360 sb and it made 426 hp at the flywheel,
then we put it in the car and it made 317 at the rear wheels on a chassis dyno,
Please stop spreading BS.
Losses from engine dyno to RW HP car is NOT a fixed percentage.
Example;
An automatic tranny have greater losses than a stick shift.
Larger rear axels have greater losses....
A belt driven fan, looses more HP the higher the RPM.... hence a screamer will loose more HP than a torque-elephant.
Using an electric fan losses are less, and an engine having serpentine belt gains maybe 4-7 HP over a V-belt.
Tire pressure will effect a reading on a roller-dyno....anyone who has tried to push a car having under inflated tires understands this.
Now, was you engine dynoed with belts at all
? before comparing to RW HP?
What exhaust system was used?
What type of dyno?
Etc, etc...
ESTIMATES range between 10 and 20%, but the smaller the engine, the greater a fan loss of say 30HP will become....in %
Any engine without boost, closing in on 1 RW HP/CID is a VERY strong engine, which translates to say HEMI, wild cam and high RPM, poor idling, and lousy gas milage.
.... and in many cases a non robust engine,... as material fatigue will come into play due to high RPM. ( A dyno mule only )
351c4v71 enjoy your mild 440...
It is hopefully a robust engine that will serve you for many years to come.
Thanks for sharing your specs.
May I ask; What gas milage do you get, and which axle ratio and tire size?
