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Compression

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super puller

10-20-2002 10:13:57




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Just a quick question on compression. I realize that compression raises horsepower, but in the game we are playing does it really help or does it hurt you more when you have higher compression.

My thouhgts are that it hurts more thna it helps becouse on a high horsepower track when you get to the end of you pull and the engine is starting to lose rpms and power there may not be enough momentum to pull the pistons though the compression stroke.


I would just like to know everyone elses thinking on this. and Please be serious.

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A puller

10-21-2002 18:56:08




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 Re: compression in reply to super puller, 10-20-2002 10:13:57  
if you get too much, it deffinately hurts the lug. there is a point that nobody knows, but most believe it's 200psi that you get too much at. A puller



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TimC

10-22-2002 06:59:12




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 Re: Re: compression in reply to A puller, 10-21-2002 18:56:08  
Like Burns said. It would depend on the number of cyls. A six cyl doesnt have to turn nearly as many degrees before another pistons reaches TDC.



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burns

10-21-2002 09:38:09




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 Re: compression in reply to super puller, 10-20-2002 10:13:57  
A little bit depends on what brand of engine and what you call high compression. On a Deere there is 540 degrees of total crankshaft rotation between power strokes. If an engine setup requires a low rpm lug, I would stay away from the excessive high psi/ratios [240<] If you have the engine or weight class that you can maintain the rpm, you can probably get away with the high compression a little easier.

Compression is cheap hp.

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randy hall

10-20-2002 20:27:42




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 Re: compression in reply to super puller, 10-20-2002 10:13:57  
more compression = more horsepower



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Uh

10-22-2002 09:07:12




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 Re: Re: compression in reply to randy hall , 10-20-2002 20:27:42  
More compression may = More HP but. Low compression (5 or 6:1)= High torque



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TimC

10-20-2002 20:04:32




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 Re: compression in reply to super puller, 10-20-2002 10:13:57  
If you can generate over 250 psi you are going to have more wheel speed because you can pull a taller gear provided you are getting it with your stroke and not the bore.

If you are slow gear pulling then you are more likley to spin out unless you are pulling heavy.
If you start loosing rpms then its about over anyway but the box is going to be a lot higher also.

Just my opinion,



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hunter

10-22-2002 19:11:10




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 Re: Re: compression in reply to TimC, 10-20-2002 20:04:32  
What are you guys talking about with 250 psi?
That is better than many diesels is it not?
I can tell you if you have the right horsepower
you do not have to worry about the torque. If you
want torque put a turbo on the engine and work
with it. You are only limited by the proper
turbo - enough cooling - and fuel. You start
with low compression and run to the limit of
the turbo - cooling - fuel. The ideal engineering
wise for a diesel is about 14 to 1 - with a turbo
If you could start the thing - even less would be
desirable. I once had a book on turbocharging
written by engineers that laid it all out.
With a turbo you can actually hold a desired
RPM and continue to put out more & more HP and
continue to put out more & more HP as engine
RPM's decrease. I once had a bunch of 1710 Allisons - they had low compression ratios - but
had a blower & turbo charger and it did not take
too much to get 3,000 hp. Hp was not the problem
"living was" - John Sandberg ran them in p-39's.

best,
bill koob

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TimC

10-23-2002 20:33:48




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 Re: Re: Re: compression in reply to hunter, 10-22-2002 19:11:10  
I havent even considered forced induction. This or at least my discussion was normally asperated only.



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MM U

10-22-2002 10:17:18




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 Re: Re: compression in reply to TimC, 10-20-2002 20:04:32  
It depends on what class you will be in. my MM U has 240 PSI and with the good heads I have and my big crank it pulls down to a certain rpm and just keeps on chugging. tons of torque.... but on large cubes they need decompressed a little to stay together...

so it just depends on what you got.
but if its a farmall all the ones ive seen with high compression havn't done anything.



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