engine dyno?
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1st Gear Member
Joined: Nov 2006
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engine dyno?
This mayor may not bea stupid question but I am going to ask anyway. Is there any way AT ALL to measure engine hp (like an engine dyno) without physically taking the engine out of a car?
2nd Gear Member
Joined: Apr 2006
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5th Gear Member
Joined: Mar 2004
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RE: engine dyno?
first off %loss from drivetrain is not really a good estimate. too many factors to control. clutch slippage or converter wear or burnt fluid or tight wheel bearings.
Chassis dyno's are what you are looking for. you put the whole car on the dyno and the rear tires spin rollers to measure the power to the ground which is the only meaningfull hp measurement.
i have seen many engines dyno big numbers on engine dyno's and only mediocre on a chassis dyno because of a sloppy drivetrain. 40% loss is not uncommon if you have a trans that is not the best but seems fine for everyday driving. a good tight trans and loose wheel bearings can give as little as 8% loss.
you never know unless you dyno the engine then have the car chassis dyno'd.
Chassis dyno's are what you are looking for. you put the whole car on the dyno and the rear tires spin rollers to measure the power to the ground which is the only meaningfull hp measurement.
i have seen many engines dyno big numbers on engine dyno's and only mediocre on a chassis dyno because of a sloppy drivetrain. 40% loss is not uncommon if you have a trans that is not the best but seems fine for everyday driving. a good tight trans and loose wheel bearings can give as little as 8% loss.
you never know unless you dyno the engine then have the car chassis dyno'd.
1st Gear Member
Joined: Jan 2007
Posts: 67
From: Juarez, Mexico (El Paso, TX neighborg)
RE: engine dyno?
In addition, i saw on a thread changing the rw pulley for a smaller one (and better design also) will reduce the rwhp loss...
high performance pulleys rulz oncheap engine improvements ha... or a good start for a big one
high performance pulleys rulz oncheap engine improvements ha... or a good start for a big one
Retired MF Moderator
Joined: Aug 2004
Posts: 14,891
RE: engine dyno?
ORIGINAL: cobra232
first off %loss from drivetrain is not really a good estimate. too many factors to control. clutch slippage or converter wear or burnt fluid or tight wheel bearings.
Chassis dyno's are what you are looking for. you put the whole car on the dyno and the rear tires spin rollers to measure the power to the ground which is the only meaningfull hp measurement.
i have seen many engines dyno big numbers on engine dyno's and only mediocre on a chassis dyno because of a sloppy drivetrain. 40% loss is not uncommon if you have a trans that is not the best but seems fine for everyday driving. a good tight trans and loose wheel bearings can give as little as 8% loss.
you never know unless you dyno the engine then have the car chassis dyno'd.
first off %loss from drivetrain is not really a good estimate. too many factors to control. clutch slippage or converter wear or burnt fluid or tight wheel bearings.
Chassis dyno's are what you are looking for. you put the whole car on the dyno and the rear tires spin rollers to measure the power to the ground which is the only meaningfull hp measurement.
i have seen many engines dyno big numbers on engine dyno's and only mediocre on a chassis dyno because of a sloppy drivetrain. 40% loss is not uncommon if you have a trans that is not the best but seems fine for everyday driving. a good tight trans and loose wheel bearings can give as little as 8% loss.
you never know unless you dyno the engine then have the car chassis dyno'd.