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Tractor Pulling Discussion Forum

cranking pressure in psi

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SUPER MTA PULLE

11-04-2005 10:39:58




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Anybody know the manufacturers compression specs on an M or Super M?Different heads High altitude or Firecrater pistons?Also 450 gas.I and T gives lots of c. r. but nothing for checking. Thank you.




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champspa

11-04-2005 13:58:29




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 Re: cranking pressure in psi in reply to SUPER MTA PULLER, 11-04-2005 10:39:58  
my 450 281cu makes 210 psi at ? hp



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champspa

11-04-2005 14:01:26




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 Re: cranking pressure in psi in reply to champspa, 11-04-2005 13:58:29  
forgot to say Webers tractor page has all the compression information under the tune-up page



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SUPER MTA PULLER

11-08-2005 10:55:38




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 Re: cranking pressure in psi in reply to champspa, 11-04-2005 14:01:26  
Do you have an adress? I found several sites but not that one.IF everything else is stock which I doubt you probably have between 60 and 65 hp @ that pressure. Thanks Chad for the rael world figures below.



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ChadS

11-04-2005 11:45:07




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 Re: cranking pressure in psi in reply to SUPER MTA PULLER, 11-04-2005 10:39:58  
They can vary so much from part to part. Ive tested a few tractors before bulding bigger engines for them, and wrote down what they had for parts for refference, Hope this helps, not book specs, but from actual tractors,,,,

My Super M, has 4-1/8th bore firecrater pistons, 8574 head, makes 170 psi at 63 hp
A 450 that had a 281, with flat top pistons, 450 gas head, made 130 psi made 57 hp
A M, with 4 inch stepped head pistons, 8060 head made 145psi, at 55-56 hp.

Id say if the Ms had flattop pistons, with the 8060 head, they would be around 115 -120 psi, wit the low compression head, they could be anywhere from 75-110 psi. Hope this helps a little, like I said, not from the book, but from actual tractors I took these readings from. ChadS

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B Barenie

11-07-2005 16:59:42




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 Re: cranking pressure in psi in reply to ChadS, 11-04-2005 11:45:07  
had a super m 8060d head 4.125 pistons 125-135 cranking pressure, put dome piston's in (used), 450 gass head ! 158-162 c.p. !


I TOTALLY AGREE WITH CHAD'S STATEMENTS !!

FIRST TIME EVER !



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