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Tractor Pulling Discussion Forum

oliver77headbuildup

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frankinct

03-22-2006 03:26:19

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i had my machineshop install slightly larger super 77 valves, i was wondering what what valve springs i can use?cam grinder wanted a stronger spring than oliver offers.the stock springs will not work.i need more spring pressure. any help appreciated.thks.

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Hitt Motorsports

03-23-2006 07:18:20

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Re: oliver77headbuildup in reply to frankinct, 03-22-2006 03:26:19

Hello,

Valve spring forces are really driven by three basic criteria: valvetrain inertia (weight effects of the valves, retainers, rockers, etc.), engine RPM, and cam profiles. Usually if you spec out a spring to cover the first two, the third will take care of itself. So, heavy valves and high RPM require more seat force, and vice versa.

The stock Oliver springs are about 40lb seat force and 80 to 90 lbs open force at .400 lift. This is too low even for stock + 20% RPM's. At a minimum for any RPM or engine combination, I do not go lower than 90lbs seat force. I now use a common dual spring on all of my Oliver heads (stock RPM to 6000RPM)---I run 130lbs seat force and about 310lbs open at .600 lift. For a mushroom tappet arrangement like the Olivers, do not go above 350lbs. or you will severely lower the life of your cam. If you need more help or need springs/retainers, etc. give me a call. 651-251-3857.

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Joshin Around

03-22-2006 05:45:13

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Re: oliver77headbuildup in reply to frankinct, 03-22-2006 03:26:19

Well you prolly wont be as lucky as I was. I was at a local "junk" auction when I saw a bunch of Racing Parts came thru the door. The last item that they sold was a box of used valve springs. I bought the box for 2 dollars, and took them home with me. They were the Triple coil valve springs so they were way to strong to put in a tractor. I removed the inner coil and took them to work with me and tested them on a valve spring press. Amazing enough out of 16 valves 12 of them matched I think about 95 psi seat pressure with the inner coil removed. Something you better watch out with is your lifters. It is a farm tractor they wernt made to run alot of valve seat pressure. If you crank up the seat pressure that makes the lifters and the cam work almost twice as hard. Once you put these heavier valve springs in be sure to keep a check on your lifters because they will dish out, if they dish out to much they will eat up your cam and since you just had it worked on dont waste your money.

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Custom King

03-22-2006 16:33:52

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Re: oliver77headbuildup in reply to Joshin Around, 03-22-2006 05:45:13

So what kind of spring pressure should you run in a large cube , big carb running 4000 - 4500 rpms? 100, 200 , 300 psi. ?

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Joshin Around

03-23-2006 06:44:59

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Re: oliver77headbuildup in reply to Custom King, 03-22-2006 16:33:52

I have been running the 95 psi seat pressure valves in a M Farmall for about 2 years and I check the lifters Religiously. I cant see any wear on them yet but I bet the tractor aint been ran 2 hours since I put the heavy springs in.

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