08-31-2004, 10:44 PM
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CC Member
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Join Date: Mar 2003
Location: Arkadelphia, AR,
AR
Cobra Make, Engine: Kirkham 427 brushed aluminum with Keith Craft 527C.I. all aluminum FE
Posts: 992
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Not Ranked
Couple of other things we pulled the engine at 600, 500, 400 and 300 rpms per second and the readings were within about 5HP and 4ft/lbs torque through out. The reason for pulling engines at different acceleration rates is to see how the engine is affected by slowing down the mass and giving the dyno more time to read. If a engine makes about the same power on a fast pull as it does on a slow pull it will accelerate in first and second gear well. These engines will normally have a lighter bob weight and crankshaft.
The other reason for a fairly good VE is that the engine is still a little lean and this is letting more air through the carburetor, richen it a little more and the VE will go down a little.
The engine was also ran at about 150 to 170 degrees most of the time. If you do a flash cool down like they do at the drag strip you would pick up a little HP/TQ. We did not install any trick oils like Royal Purple which is ussually worth about 5HP up high. Just plane straight forward testing. Thanks Keith
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Keith C
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