oil mods
Senior User
Joined: Oct 2003
Posts: 126
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From: Portland, CT
Not sure Ihave a recommendation. I would error on the high side as you could starve the system with too small a jet. How small is too small? Not sure I know. I would install the 90 jet and call it good. It is a significant cut back from the original flow.
Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 25
From: Middle Tn.
I've never done it on my 428cj, original owner, and have never had a problem.
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Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
Restricting the feed to the rockers just insures that more oil gets to the crank, where it can of greater benefit.
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Post Fiend
Joined: Apr 2008
Posts: 8,261
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From: Big Sky Country
On a stock FE that will rarely see north of 3,500 rpms i don't feel it's needed, but a lot of guys do it for "peace of mind".
Junior User
Joined: Jul 2010
Posts: 71
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Ok,,, here is the answer to your question.
Most FE's that are raced use high volume oil pumps to supply adequate amounts of oil to keep their engines alive at high rpms. At sustained high rpms, you can pump to much oil into the valve covers that starves the crank, and cam. The two most used fixes for this is a deep oil pan to hold more oil and or restrictors in the heads to reduce the amount of oil going to the valves. Most FE racers do both modifications to keep their engines alive, along with other modifications to the block for better oil flow. As what was said above, for an engine that is not seeing high rpm, the modifications are not needed.
Most FE's that are raced use high volume oil pumps to supply adequate amounts of oil to keep their engines alive at high rpms. At sustained high rpms, you can pump to much oil into the valve covers that starves the crank, and cam. The two most used fixes for this is a deep oil pan to hold more oil and or restrictors in the heads to reduce the amount of oil going to the valves. Most FE racers do both modifications to keep their engines alive, along with other modifications to the block for better oil flow. As what was said above, for an engine that is not seeing high rpm, the modifications are not needed.
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