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Posted by john copeman ontario can. on Thursday, January 31, 2008 at 19:44:49 :
In Reply to: Dyno Shop- 'Before', FFPW 230 posted by Chris Case @ San Diego on Thursday, January 31, 2008 at 14:24:07 :
i have dyno hundreds may be even thousands of engines those results are not bad when dyno testing ,we used to put the vehicle on the rollers and in nuetral then drive with the dyno, the power train!this would measure parasitic (sp)or how much power(horse) it takes to drive the rears wheels, turn the u joints roll the gears and bearings in the trans and tranfer cases,differentials, ect this amount of power would be deducted from what the rear wheels can spin the dyno at max speed, other factors that can reduce dyno results are air temperature, barometric pressure and relative humidity ,elevation above sea level also the fan takes power alternator / generater water pump and any other accesories contrubute to draw of power i have seen on some big set ups draw of up 90 to 100 horse power!! air conditioning power steering pumps alternators charging at 90 amps and when a 50 inch clutch fan kicks in wow.. horse power is horse power, but the torque measurement is the biggie alot of manufactures give you the horse power bare bones ie on a test stand that uses no pumps, accesories such as water pumps alternaters or restictive exhaust and are run in a controled eviroment "NEW" engines after that they are rated so i allways figure half at the wheels on stock isnt to shabby
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