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Tractor Pulling Discussion Forum


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iH welker

10-21-2012 13:53:24

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Looking at a engine with 409 cid about what horse would that turn out to be ?

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10-22-2012 16:42:42

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 Re: Horsepower in reply to iH welker, 10-21-2012 13:53:24  
We have a 407 & 409 Murphy's rotating kits with lp heads. They dyno at 130 hp at 620 PTO rpms.

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10-22-2012 14:13:19

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 Re: Horsepower in reply to iH welker, 10-21-2012 13:53:24  
I usually figure about .25 hp per cu in that makes it around 102 for me . you can only go by what you know so that figure is at 540 pto . it will be a lot more when you take it up rpm 20 percent .

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Dirt slinger

10-22-2012 03:24:54

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 Re: Horsepower in reply to iH welker, 10-21-2012 13:53:24  
Mine is over 130. The short block is for sale as soon as my new block is finished. Anyone interested? Will be available soon.

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10-22-2012 20:53:57

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 Re: Horsepower in reply to Dirt slinger, 10-22-2012 03:24:54  
e-mail me at i may be interested in the short block

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Grampas Toy

10-21-2012 19:53:55

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 Re: Horsepower in reply to iH welker, 10-21-2012 13:53:24  
I can't give you an exact h.p. no. but the engine is reliable if the machine work is done well. we are turning 2800 rpm. be ready to provide lots and lots of air and fuel, she's hungry.We were in the money every where we went last summer.

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10-21-2012 18:48:03

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 Re: Horsepower in reply to Cody, 10-21-2012 13:53:24  
wow I would have guessed 120hp, but I am not into farmalls

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north puller

10-21-2012 18:34:52

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 Re: Horsepower in reply to iH welker, 10-21-2012 13:53:24  
4.310" bore and 7" stroke for a farmall 450, with 11:1 compression and a few "add ons".

Would the "add ons" be a cam and roller rockers?

Would this engine happen to use billet rods?

Why don't you ask the guy putting the package together what the power should be.

Then again, engine RPM, carb modifications, and head modifications can have a major impact on an engine when you get that big.

I would guess 90 hp if you keep the carb and head stock.

I believe the seller of the parts has said that his customers have seen better than 110 hp with the right setup.

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10-21-2012 14:19:48

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 Re: Horsepower in reply to DPG, 10-21-2012 13:53:24  
Gonna need a lot more info.... Assuming a IH, H,M,350'450,460,560

Also what is compression, bore and stroke ( I personally think there is more power to gain by stroking than boring)...
What head is being used as some flow better than others, max RPM

That should be able to get some ideas going, maybe even stir the pot a little :wink:

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iH welker

10-21-2012 14:41:52

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 Re: Horsepower in reply to 6pack, 10-21-2012 14:19:48  
Bore 4.310 stroke 7" gas head 11.0 cr and a few more add ons

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iH welker

10-21-2012 14:43:32

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 Re: Horsepower in reply to iH welker, 10-21-2012 14:41:52  
Sorry it's a 450 engine !!!!

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