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.903" vs .904" lifter?
Posted: August 7th, 2009, 4:33 pm
by SilverXJ
I talked with Lunati and they said that the .903" lifters would work fine in the 4.0L, which takes a .904" lifter. However, now I have advice not to use a .903" lifter. According to the FSM lifter tolerance is .904"-.9045", lifter bore .9055" to .9065", and lifter to bore clearance at .001" to .0025".
So, would you advise using a .903" lifter or not?
Re: .903" vs .904" lifter?
Posted: August 7th, 2009, 5:12 pm
by Flash
Why are you considering these lifters?
what is, interesting about them? or is this the latest idea on getting more oil on the cam?
Re: .903" vs .904" lifter?
Posted: August 7th, 2009, 6:53 pm
by SilverXJ
http://www.lunatipower.com/ProductGroup ... d=28&pid=2
They are the microtrol lifters. It was hard to find a company that has a lifter made in the US. Lunati's lifters and they have better oil control, and can afford less preload than others.
Re: .903" vs .904" lifter?
Posted: August 8th, 2009, 4:51 am
by dwg86
Racer Brown sells Stanadyne lifters. They are made in the USA. They are around $60.00 for a set.
Re: .903" vs .904" lifter?
Posted: August 8th, 2009, 1:58 pm
by SilverXJ
oh yeah.. I already have these lifters and trying to figure out if i can use them or not.
Re: .903" vs .904" lifter?
Posted: August 9th, 2009, 3:56 pm
by amcinstaller
if you have custom length pushrods, why couldnt you use these?
Re: .903" vs .904" lifter?
Posted: August 9th, 2009, 5:02 pm
by SilverXJ
Its the diameter, not the height of the lifters.
Re: .903" vs .904" lifter?
Posted: August 17th, 2009, 7:01 pm
by SilverXJ
I just measured the lunati lifters to be .9036" to .9038", which is the same as a set of engine tech lifters and a set of compcam lifters.
Re: .903" vs .904" lifter?
Posted: August 17th, 2009, 8:56 pm
by gradon
Use them already!
Re: .903" vs .904" lifter?
Posted: August 17th, 2009, 9:40 pm
by SilverXJ
LOL.. as soon as I get the cam.
Re: .903" vs .904" lifter?
Posted: August 19th, 2009, 6:12 pm
by SilverXJ
Here is something interesting. I compared a Lunati, a Crower Cam Saver, an OEM, a Comp Cams and an Engine Tech. All measured .9036" to .9038" except the OEM and Crower. They measured .9044" to .9045"
Re: .903" vs .904" lifter?
Posted: August 19th, 2009, 8:13 pm
by Muad'Dib
very interesting...
I would think it all depends on what diameter the bore is in the block...
To big of a clearance could cause what? Lower oil pressure?
Re: .903" vs .904" lifter?
Posted: August 19th, 2009, 8:31 pm
by SilverXJ
Given the same bore diameter a smaller lifter will be able to wobble more, but I don't know if that has any effect. Lower oil pressure perhaps. I have ran several of these lifters in the same block and noticed no real oil pressure difference. Even with the Crower Cam savers and their flat spot I noticed no real oil pressure change. I'm not really certain that the size makes that much of a difference considering the majority are of the smaller size and the most commonly used.