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Thread: Cam lift and rocker ratio on 3.5l EFI

  1. 14th October 2013, 12:00 PM #1
    Jazzman
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    Cam lift and rocker ratio on 3.5l EFI

    Can anyone tell me what the cam lift and rocker ratio is in a standard 3.5l EFI rover V8?
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  2. 14th October 2013, 12:49 PM #2
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    cdbanks
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    Standard valve lift is 9.9mm/.390in and the ratio is 1.6:1

    EDIT:Just saw another article which has the ratio at 1.5:1 so now i am not sure. Better wait for one of the gurus to come in with the correct numbers.
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  3. 14th October 2013, 09:15 PM #3
    Jazzman
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    Is 9.9mm the cam lift or the valve lift?

    Quote Originally Posted by cdbanks View Post
    Standard valve lift is 9.9mm/.390in and the ratio is 1.6:1

    EDIT:Just saw another article which has the ratio at 1.5:1 so now i am not sure. Better wait for one of the gurus to come in with the correct numbers.
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  4. 14th October 2013, 10:07 PM #4
    Hoges
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    The Buick 215/Rover motor has a standard rocker ratio of 1.6:1 and as CDBanks righly points out a standard valve lift of 9.9mm. Thus the actual cam lobe "lift" exerted on the hydraulic lifters/tappets -> pushrods is 9.9/1.6 =6.16mm.
    ps Not a guru :-) just had to read a lot to sort out lifter preload for replacement standard cam etc after heads were skimmed following a blown head gasket.... ended up having to shim the rocker posts 16 thou each...

    you can get all the info if you read the extracts of Des Hammill's excellent reference work "How to Power Tune Rover V8 Engines for Road and Track". http://booklens.com/des-hammill/how-...road-and-track
    cheers
    MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
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  5. 15th October 2013, 07:36 PM #5
    Jazzman
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    Thank you very much. Curious then that I have 8mm lift on my values. Anyway it is obviously not warm out and has probably been replaced before.

    I'm just going to put my car back together and hope for the best.

    Quote Originally Posted by Hoges View Post
    The Buick 215/Rover motor has a standard rocker ratio of 1.6:1 and as CDBanks righly points out a standard valve lift of 9.9mm. Thus the actual cam lobe "lift" exerted on the hydraulic lifters/tappets -> pushrods is 9.9/1.6 =6.16mm.
    ps Not a guru :-) just had to read a lot to sort out lifter preload for replacement standard cam etc after heads were skimmed following a blown head gasket.... ended up having to shim the rocker posts 16 thou each...

    you can get all the info if you read the extracts of Des Hammill's excellent reference work "How to Power Tune Rover V8 Engines for Road and Track". How to Power Tune Rover V8 Engines for Road and Track - Des Hammill - ebook
    cheers
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