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Rocker arms

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wags

03-10-2003 05:04:47




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I would like some information about custom rocker arms. -Is there a custom rocker arm set that will give valves more lift? -Is this a better way to go for added horse-power then cam-grinding...(pulling in Div. 3)




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Ron

03-10-2003 07:45:42




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 Re: rocker arms in reply to wags, 03-10-2003 05:04:47  
If you are going to go that far, to make horse power....go the next step, and have some serious valve work done, to.... At least have the valves contoured on the port-side, right down to the seating angle... Same, on the port...make sure the seats are NOT sunk...!!! If they are, have them replaced.!! Multi-angle, and blend from the seat angle, to the port, and you will see A great deal of improvement in performance,with or without a cam and rockerarms.... What you are doing, is increasing the flow at .050" lift, as well as the effective opening at ALL valve lifts... Many times, this is more effective than larger valves..!!

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G-MAN

03-10-2003 13:41:20




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 Re: Re: rocker arms in reply to Ron, 03-10-2003 07:45:42  
I agree totally. I've seen more than one guy spend mucho dinero on a killer short block and then throw a set of junk stock heads with a cheap valve job on it and expect to make power. The best money spent on getting performance goes in the head and valvetrain every time.



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G-MAN

03-10-2003 05:27:17




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 Re: rocker arms in reply to wags, 03-10-2003 05:04:47  
Murphy's Motor Service makes billet rocker arms for several different applications - JD, Oliver, Moline, etc. A higher-ratio rocker will open the valve farther and keep it open longer, but it can't change the lobe separation or other properties of the camshaft that a regrind can. If you're running a two-cylinder Deere, I've heard that the cams weren't ground all that accurately to begin with, so I'd consider a regrind. I'd consider a regrind on pretty much any old tractor, because grinding procedures and accuracy have come a long way in the last 50 years. Re-grinding the cam will eliminate that as a possibility for potential problems.

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tim

03-10-2003 10:50:43




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 Re: Re: rocker arms in reply to G-MAN, 03-10-2003 05:27:17  

a reground cam is money well spent in my opinion.just be honest with your cam grinder what rpm you're gonna be running under load.also,be certain to degree your cam to the grinders specs. i have seen a couple of farmall regrinds that were 5-7 degrees late. just my 2 cents.



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