OHV - Springs

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Model T Ford Forum: Forum 2013: OHV - Springs
Top of pagePrevious messageNext messageBottom of page Link to this message  By Ricks - Surf City on Sunday, July 07, 2013 - 05:29 pm:

While I have the Fronty R head off, I'm replacing the valves with new big block Chevy valves and guides. I know I'm weaker, but the springs seem a lot more stiff than they need to be for an engine I rarely spin over 4,000 rpm. Add to that the 3:2 lifter ratio, and that has to be hard on the cam.

What would be a good spring force?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ken Kopsky, Lytle TX on Sunday, July 07, 2013 - 06:16 pm:

What is it now and what is the installed spring height? Lift ratio doesn't factor in. The spring is to close the valve. You need more than stock to close those big Chebby valves. Especially at higher rpms.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ricks - Surf City on Sunday, July 07, 2013 - 06:57 pm:

Free height = 2.3"
Installed = 2"
~.015 wire, OD 1.375

I'm thinking of the load on the cam compared to stock springs and 1:1 lift. I don't want to be worried about lack of ZDDP. . . :-)

Yeh, the valves are big: 1.875" intake and exhaust, so they almost kiss in the middle of the chamber. That also means a set of BBC exhaust valves will do for the whole head.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Roar Sand on Sunday, July 07, 2013 - 07:55 pm:

Ricks,
Those "retainers" look suspiciously like "Rotocaps" or "Rotocoils". Are you running positive rotation devices?
Just curious.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Frank Harris from Long Beach & Big Bear on Monday, July 08, 2013 - 12:42 am:

60 pounds when compressed on your set-up, not on the bench


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jerome Hoffman, Hays KS on Monday, July 08, 2013 - 08:10 am:

Out of my new springs I get 42lbs at an installed height of 2". Sold my extra set last year. If interested I can get you the name and number of who has new ones. J


Top of pagePrevious messageNext messageBottom of page Link to this message  By kep on Tuesday, July 09, 2013 - 04:35 am:

Would the camshaft break from flexing?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Roger Karlsson, southern Sweden on Tuesday, July 09, 2013 - 05:04 am:

No, The problem with unnecessary strong valve springs would be the extra wear on the cam lobes from the lifters. Maybe ZDDP in the oil would be more important with an overhead setup, otherwise usually not needed in a standard T.


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