Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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castlesid
Kevin Jackson
Sidcup UK
(361 posts)

Registered:
11/18/2007 10:38AM

Main British Car:
1975 MGB GT Rover V8 4.35L

Lifter noise
Posted by: castlesid
Date: March 01, 2009 07:45AM

On a newly built Rover 4.35 engine which has a Crower 50232 cam and crane Hi-Rev lifters i'm experiencing bleed down of the lifters if the engine isn't started for a week or two.

The preload was set at 25 thou to allow for bedding in the engine with the anticipation the it would close up slightly after the cam and valve train components had settled down, the recommended minimum preload being 20 thou.

The question is basically is this the norm for Hi rev lifters, the lifters do quieten down within approx 20 seconds of starting so am I just being paranoid as ususal.

kevin.


NixVegaGT
Nicolas Wiederhold
Minneapolis, MN
(659 posts)

Registered:
10/16/2007 05:30AM

Main British Car:
'73 Vega GT 4.9L Rover/Buick Stroker

authors avatar
Re: Lifter noise
Posted by: NixVegaGT
Date: March 10, 2009 09:41AM

The same thing used to happen with my hi-rev lifters in another type engine. It did cause more ware on the cam but I didn't really break the cam in correctly either. I didn't really answer your question.

Anybody else?


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Lifter noise
Posted by: BlownMGB-V8
Date: March 10, 2009 10:04AM

High rev lifters are just normal lifters with a sloppy internal bore. So yes, they will bleed down. You may lessen the effect by going to the maximum preload.

Jim
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castlesid
Kevin Jackson
Sidcup UK
(361 posts)

Registered:
11/18/2007 10:38AM

Main British Car:
1975 MGB GT Rover V8 4.35L

Re: Lifter noise
Posted by: castlesid
Date: March 10, 2009 08:02PM

Thanks Nick & Jim,

Sounds like there's nothing much to worry about then.

Kevin.


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