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Kirkham Motorsports

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  #61 (permalink)  
Old 12-30-2017, 11:33 AM
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My worn follower wouldn't come out the top, but I was able to drop it out the bottom once the cam was removed. If you can't removed the cam due to the damaged follower, you may have a bit more of a challenge on your hands.

Paul
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  #62 (permalink)  
Old 12-30-2017, 11:49 AM
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I started the reassembly today, but on unpacking Doug's H+M cam and followers, I discovered that it has shell rather than dumbbell type followers, which obviously means longer pushrods.

My question is, would it be easier and possibly cheaper to buy a new set of dumbbell followers, or do I need to get some custom length pushrods?

I have Dove roller rockers and I've just ordered some new posts, end-supports and spacers from Precision Pumps.

Thanks,
Paul
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  #63 (permalink)  
Old 12-30-2017, 02:28 PM
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Quote:
Originally Posted by FatBoy View Post
Well, I have at last pulled the engine out and stripped the top and bottom ends off. It was obvious that something was amiss with the follower of the missing cam lode because it wouldn't come out through the top of the block like all the rest.
I pulled the cam out and and the problem lobe looked like someone had taken an angle grinder to it and nicely rounded all the edges off. I pushed the corresponding follower out through the bottom and what should have been a very slight convex face was a very defined concave to match the nicely rounded cam.
On the plus side, everything else looks to be in really nice condition and having check a couple of big-ends, they look perfect with absolutely no signs of marking, let alone scoring.
I think I may have dodged a bullet.

Paul
The lifter and the lobe disappear like this from lack of rotation.

Can happen suddenly and failure occurs in a short period.

Gary
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  #64 (permalink)  
Old 12-31-2017, 04:42 PM
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Originally Posted by Dominik View Post
Thanks for that. I've been telling people since years that swapping a cam&lifter from one block in another may lead to premature loss of cam lobes.
Yes + 1.

The lifters are considered used. Swapping a cam to another engine needs new lifters.
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  #65 (permalink)  
Old 12-31-2017, 04:44 PM
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Quote:
Originally Posted by FatBoy View Post
I started the reassembly today, but on unpacking Doug's H+M cam and followers, I discovered that it has shell rather than dumbbell type followers, which obviously means longer pushrods.

My question is, would it be easier and possibly cheaper to buy a new set of dumbbell followers, or do I need to get some custom length pushrods?

I have Dove roller rockers and I've just ordered some new posts, end-supports and spacers from Precision Pumps.

Thanks,
Paul
Can you post a pic?
Never heard of Dumbbell followers.
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  #66 (permalink)  
Old 01-01-2018, 01:47 AM
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Here is a link to the Comp Cams solid "dumbbell" lifter:

https://www.summitracing.com/int/par...5-16/overview/

Based on the advice being given, I should be buying new lifters in any case. In retrospect, it would probably have been easier to buy a new cam and lifters from the outset, rather than buying dcdoug's used items.

I've had a closer look at the other lifters that I took out of the engine and they're worn flat on the cam end, rather than having the necessary convex profile, so they were all on the way out.

Paul
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  #67 (permalink)  
Old 01-01-2018, 02:49 PM
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The link doesn't work Paul.

I've searched Summit for "dumbbell" and I can't find that either.

Gary
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  #68 (permalink)  
Old 01-01-2018, 03:13 PM
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Originally Posted by Gaz64 View Post
I've searched Summit for "dumbbell" and I can't find that either.

Gary
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  #69 (permalink)  
Old 01-02-2018, 02:19 AM
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Dumbbell.. :-)
They have a reduced diameter (neck) from halfway to a quarter up to save weight.
Actually look like a mini dumbbell.
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  #70 (permalink)  
Old 01-02-2018, 03:46 AM
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Update...

I'm now talking to Brent about a custom ground cam rather than using Doug's old cam, so I think I'll be going down that route instead.

Anyone want a Holman + Moody cam and followers?

Paul
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  #71 (permalink)  
Old 01-02-2018, 03:50 AM
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Quote:
Originally Posted by Dominik View Post
Dumbbell.. :-)
They have a reduced diameter (neck) from halfway to a quarter up to save weight.
Actually look like a mini dumbbell.
They appear to be the standard/original type for FE's although most of the suppliers now seem to sell the lighter hollow shell type and use longer pushrods.

If I were starting from scratch, I'd probably go down the shell route, but as my top-end has been setup for the dumb-bell type, I'll stick with those.

Paul
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  #72 (permalink)  
Old 01-02-2018, 03:56 PM
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Yes Paul, I thought that's what we are talking about here, wasted at the middle.

Looks like a dumbbell, just never heard referenced in that manner.

Lightweight solid lifters makes more sense for me, .

Gary

Last edited by Gaz64; 01-02-2018 at 04:00 PM..
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