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Tractor Pulling Discussion Forum

Cubic inches to HP

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diesel puller

01-22-2004 17:13:48

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I was wondering how or if you can figure horsepower from cubic inches.

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Buzzman72

01-24-2004 06:38:44

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Re: Cubic inches to HP in reply to diesel puller, 01-22-2004 17:13:48

There's no magic formula to convert cubic inches to horsepower. Look at it this way: if there was just one formula, how could the '60's Chevy 327's make a different range of horsepowers between 250 and 375? Couldn't be done, if there was just one formula.

Bore, stroke, rod length and angularity, camshaft lift, duration, overlap, lobe separation, rpm, and brake specific fuel curve are just a few of the factors going into figuring the horsepower of a particular engine at a particular rpm with a particular set of components...and sometimes unpredictable things--good AND bad--happen that only show up on the dyno.

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CFM

01-23-2004 19:18:12

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Re: Cubic inches to HP in reply to diesel puller, 01-22-2004 17:13:48

Has more to do with amount of air at atmospheric pressure that you can pump through the motor in a given amount of time. So you have to figure Displacement and RPM's to figure HP. As for an actual formula I can't help you there. Also depends a lot on the heads and proper fuel delivery.

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buickanddeere

01-22-2004 17:34:20

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Re: Cubic inches to HP in reply to diesel puller, 01-22-2004 17:13:48

A rough rule of thumb is. 1/4HP per cu" for a natural aspirated diesel at 1800rpm. 1/3HP per cu" for turbo and 1/2HP per cu" for turbo intercooled. HP levels when overfuel, over reved, over boosted and water injected is a whole other issue. Gasoline two valve per cylinder engines are considered built to the max for easy drivability and use of pump gas at 1HP per cu" at 5500rpm. About 1/2HP per cu" for a plain boring carburated engine and 1/3 HP/cu"for a a plain boring injected emissions engine. Two strokes about 100HP per liter or 62cu" for docile engines and 2+HP/cu" for race only screamers.

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Holy smoke

01-22-2004 19:01:05

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Re: Re: Cubic inches to HP in reply to buickanddeere, 01-22-2004 17:34:20

Does this mean Brad Begamens MMG6 has 750 hp. Heard he has close to 1500 cu. in. in the engine.No wonder nobody pulls against him.

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well...

01-23-2004 14:05:33

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Re: Re: Re: Cubic inches to HP in reply to Holy smoke, 01-22-2004 19:01:05

there where a few people at tunica that thought they could(well it was its twin tractor,Iron Dragon) most weren't close,he full pulled, then Bewleys moline followed him right out the door....in the pull off bewley forgot to turn his fuel pump on...HAHA...wish he woulda remembered it woulda made things interesting

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a puller

01-23-2004 15:25:38

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Re: Re: Re: Re: Cubic inches to HP in reply to well..., 01-23-2004 14:05:33

our A is 360 cubes...and we had 57horse. 360/57 is 6.3 cubes per horsepower....

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buickanddeere

01-23-2004 19:35:47

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Re: Re: Re: Re: Re: Cubic inches to HP in reply to a puller, 01-23-2004 15:25:38

The "A" at 321 cu" running at 1200rpm would be well built to make 73HP. The other post with the 1500HP missed the point. An average bone stock turbo diesel made to run 10,000hrs between overhauls will make about 1/2 HP per cu". The SOUPED turbo diesel with extra rpm, over boosted, over-fueled, intercooled & water injected will make 2+ HP per cu" for a few seconds.

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12 Busch Lites

01-24-2004 18:36:41

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Re: Re: Re: Re: Re: Re: Cubic inches to HP in reply to buickanddeere, 01-23-2004 19:35:47

A super stock 4 turbo set-up makes more than 5 H.P. per cubic inch. A nitro burning dragster makes more than 10 H.P. per cubic inch. A stock Ford 600 takes 4.47 cubic inches to make 1 H.P. A stock WC takes more than 7 cubic inches to make 1 H.P. A '34 J.D. A takes well over 12 cubic inches to make 1 H.P. The most important factors involved here are R.P.M.,C.F.M., and compression.

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plowboy

01-24-2004 16:11:36

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Re: Re: Re: Re: Re: Re: Cubic inches to HP in reply to buickanddeere, 01-23-2004 19:35:47

1/2 hp per cu inch for a stock NA diesel? I sure can't think of any that make that . That would mean a 200 horsepower 4020, 250 hp G1000, 250 hp 5020, etc.

In reality there is far more to it then CID. Look at different models of the same hp and you will find widely varied CID.

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buickanddeere

01-25-2004 20:23:30

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Re: Re: Re: Re: Re: Re: Re: Cubic inches to HP in reply to plowboy, 01-24-2004 16:11:36

Go back to my other post where it said 1/4HP per cu" at 1800rpm for a diesel. 1/2 HP per cu" at 1800rpm for a turbo/intercooled diesel. I did miss the word intercooled on the previous post to make it match the 1st post.

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