PistonHeads.com Forum

Cam regrind

Author
Discussion

Arnold Cunningham

Original Poster:

737 posts

174 months

Wednesday 6th September
quotequote all
Due to a ballsup on my part, I've managed to damage a lobe on the cam for my tall deck mk IV BBC motor - hydraulic roller cam with morel lifters.

I've given it a polish with 2000 and the mark is still there. As it's a roller cam, I suspect it'll be ok if I run it, but I'm not really in the mood for chancing, so I'd rather have it cleaned up properly.

Can anyone recommend a company in the south that could do this? Alsop could do it I guess, are there any others?

Boosted LS1

16,340 posts

181 months

Wednesday 6th September
quotequote all
Is it just a witness mark or can you see damage? If you can't see or feel and damage I'd have thought it would be just fine.

Arnold Cunningham

Original Poster:

737 posts

174 months

Wednesday 6th September
quotequote all
I can "just" feel it. It's a depression rather than raised, and with a straight edge can just detect it. So its probably a couple of tenths at most.

When assembling it late one evening managed to put one roller pair in reversed. Dumb arse move trying to work late at night long after I should've called it a day. Cranked it over 1 cycle before I spotted it - mark left. Doh!

The roller is fine, harder material. Very slight visible mark on it, but completely undetectable with fingernail etc.

stevieturbo

12,581 posts

168 months

Wednesday 6th September
quotequote all
Are you sure it wasnt like that before ?

Seems odd one crank would cause any damage ?

Any pics ?

Boosted LS1

16,340 posts

181 months

Wednesday 6th September
quotequote all
Fitting a roller the wrong way round shouldn't cause a problem. Like Stevie suggests have you got pics? I suspect the 'damage' was always there if indeed it's damage.
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Mignon

214 posts

10 months

Thursday 7th September
quotequote all
I'm not sure what you think 2000 grit w&d paper is going to do to a chill cast or induction hardened cam lobe other than very mildly annoy it but I can assure you this is not the answer. Nor is any hope of someone being able to regrind or otherwise fix this with some sort of machine. To grind or regrind a cam lobe you need the original master cam profile to follow or on more modern CNC machinery the full digital lobe profile. If you want to do something constructive then take a 1" wide strip of 180 grit with some lubricant like thin oil or paraffin and strop the lobe by hand until the mark goes away. It may take a while. A good way of stropping both cam and crank journals is to use a length of old cam belt as a backing for the w&d paper.

Arnold Cunningham

Original Poster:

737 posts

174 months

Thursday 7th September
quotequote all
Thanks. So, back to the original question, is there someone who has the right kit to be able to advise and/or help?

Arnold Cunningham

Original Poster:

737 posts

174 months

Thursday 7th September
quotequote all
@mignon. You've gotta be David Baker with that level of grumpiness? wink
Welcome back.

227bhp

5,358 posts

49 months

Thursday 7th September
quotequote all
Arnold Cunningham said:
@mignon. You've gotta be David Baker with that level of stroppiness? wink
EFA.

Boosted LS1

16,340 posts

181 months

Thursday 7th September
quotequote all
Nope your both wrong, ya gits. I'm Baker the bread maker..

Boosted LS1

16,340 posts

181 months

Thursday 7th September
quotequote all
Arnold Cunningham said:
@mignon. You've gotta be David Baker with that level of grumpiness? wink
Welcome back.
I read your earlier post when you posted it and was waiting for the beating to arrive but nothing happened. I was quite disappointed as there could have been some entertainment ;-) .

stevieturbo

12,581 posts

168 months

Thursday 7th September
quotequote all
Arnold Cunningham said:
@mignon. You've gotta be David Baker with that level of grumpiness? wink
Welcome back.
Or that level of fact stating ?

And answering the question which seems to have been overlooked given the post that followed ?

Boosted LS1

16,340 posts

181 months

Thursday 7th September
quotequote all
And hence why I was expecting the bread makers blistering reply, lol. The advice had already been given.

Arnold Cunningham

Original Poster:

737 posts

174 months

Friday 8th September
quotequote all
Thanks all. Much appreciated as always.

Arnold Cunningham

Original Poster:

737 posts

174 months

Friday 8th September
quotequote all
I notice the other chap that posted deleted his post. Where'd he go?

Boosted LS1

16,340 posts

181 months

Friday 8th September
quotequote all
^ Who do you mean?

Arnold Cunningham

Original Poster:

737 posts

174 months

Friday 8th September
quotequote all
I didn't catch his name, but he posted a pic of his tall deck motor with iron heads, roller lifters and part of an std-> tall deck intake spacer on the block.

Boosted LS1

16,340 posts

181 months

Friday 8th September
quotequote all
Ah, I think I missed that.

Arnold Cunningham

Original Poster:

737 posts

174 months

Friday 8th September
quotequote all
You keep changing the pictures! smile

What was the spec?

Arnold Cunningham

Original Poster:

737 posts

174 months

Friday 8th September
quotequote all
Interesting. What's it in?