Engine and Transmission Tech

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

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e.drooy
erik rooy

(2 posts)

Registered:
11/03/2019 03:16PM

Main British Car:


How much do lifters expand when engine running? Yella Terra rockers hitting the covers
Posted by: e.drooy
Date: August 19, 2021 03:04AM

Hi All :)
My name is Erik and Im in the process of building/modifying my MGB V8. And Ive run into a little problem with my new Yella Terra rockers...., the covers dont fit anymore. So the plan is to make a layer between the covers and cylinder head to lift the cover clear of the rockers. The question is how much should i raise the covers to stay clear of the rockers when the engine is running?

Thanks so much for help! Will soon post pictures of the project


mgb260
Jim Nichols
Sequim,WA
(2276 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: How much do lifters expand when engine running? Yella Terra rockers hitting the covers
Posted by: mgb260
Date: August 19, 2021 10:54AM

There are valve cover spacers you can buy on Ebay for that purpose.

[www.ebay.com]



Edited 1 time(s). Last edit at 08/19/2021 10:56AM by mgb260.


roverman
Art Gertz
Winchester, CA.
(3178 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: How much do lifters expand when engine running? Yella Terra rockers hitting the covers
Posted by: roverman
Date: August 19, 2021 07:11PM

OR you can go with 340 Buick = more rocker room and they look different. Art.


e.drooy
erik rooy

(2 posts)

Registered:
11/03/2019 03:16PM

Main British Car:


Re: How much do lifters expand when engine running? Yella Terra rockers hitting the covers
Posted by: e.drooy
Date: August 25, 2021 06:00PM

hmm, the idea is to go for 3D printing, the same as for some other parts... no need to lift the covers more than strictly necessary because the thor manifold is in the way of raising the covers.


RoverP6B
Graham Ware

(10 posts)

Registered:
08/28/2008 09:59PM

Main British Car:


Re: How much do lifters expand when engine running? Yella Terra rockers hitting the covers
Posted by: RoverP6B
Date: December 15, 2021 09:47AM

You can also use Offenhausers valve covers as these are a bit taller than stock, Iím also using Yella Terras. Graham



Edited 1 time(s). Last edit at 12/15/2021 09:48AM by RoverP6B.


Robrover
Rob Thornton
Adelaide, Australia
(20 posts)

Registered:
10/01/2009 11:52PM

Main British Car:
1978 Rover SD1 4.6

Re: How much do lifters expand when engine running? Yella Terra rockers hitting the covers
Posted by: Robrover
Date: January 08, 2022 09:22PM

I fitted a custom metal spacer between my 4.6 block and P6B covers to clear the YT roller rockers. You may also be able to glue two cork rocker cover gaskets together to achieve enough clearance, though the spacer or a taller other make cover is a better option.


rficalora
Rob Ficalora
Willis, TX
(2764 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: How much do lifters expand when engine running? Yella Terra rockers hitting the covers
Posted by: rficalora
Date: January 15, 2022 09:47AM

Hydraulic lifters have a total travel of about 0.200. So, start by measuring the gap between the cover and cylinder head, subtract the gasket thickness, and add 0.200. That plus a few thousands clearance would be the absolute minimum. But, personally, I would want at least 1/4" or more clearance. That way I wouldn't have to worry about differences in gasket thicknesses that might get used over the years.

Also, if your covers aren't baffled, when the rockers are that close, you'll need to consider how to keep oil from getting sucked into your PCV &/or quickly saturating the breather.

For reference, this is a picture of my cover which has about 1/4" clearance to the under side of the cover. They are not baffled.


If you can 3D print, why not just print yourself a few sets of washers at
IMG_15012022_084509_(580_x_435_pixel).jpg



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