[Mk2] [Turbo] 272's again

[Steve Horrocks]

Or the damage on the cam will pick up on the head journal, transfer ally award down the oil feed, block that one up, poss pass onto next oil feed, then, due to running dry, friction weld the cam in position, snap it, hold valves open, make contact with pistons (high lift cam, non OE pistons???)

Again, not that it "will" happen, just that it "could". And I know which chance I'd take. It may last 20k miles. It may last 200.


2p

[Chris]

I'd fit them...

[ashley]

You could simply get the journals turned down slightly to take out the marks, but then you'd need to line bore the head and caps....cheaper to buy a new set of cams...

I'd get a professional engineer to check em out, see how much they would need taking off to clean them up and take it from there...I reckon you'll end up binning the cams though

[Slarty]

You could simply get the journals turned down slightly to take out the marks, but then you'd need to line bore the head and caps....cheaper to buy a new set of cams...

I'd get a professional engineer to check em out, see how much they would need taking off to clean them up and take it from there...I reckon you'll end up binning the cams though

You wouldn't be able to line bore the cam journals as that specific one would need to be bored over size and having the damage removed from the cam bearing would make it undersize. The only conceivable way that it could be done would be to grind the damage off the cam bearing and have the matching bearing journal in the head machined oversize and fit bearing shells to bring it to the correct size.

It'd be cheaper to throw the cams away and get a new pair.

As for using them as is, it's a very grey area. "If" the damage is below the bearing surface and doesn't cover too large a percentage of the surface, you "might" get away with it. From a manufacturing point of view, they'd be scraped in a heartbeat and I tend to lean towards that too....

[ashley]

The machine shop would simply plain down the flat mating faces where the caps bolt to the head (so some off the caps, and some off the head), then they can line bore to a smaller than stock diameter to match the machined cam shaft journals

EDIT: sommit like this:



Yes- I am bored!!

[slipping clutch]

Having taken yet another look at these cams in the hope that "there not as bad as I thought" I have to say they are in fairness I should say that the seller has been in contact with me and whilst stating that "I didnt look at them I just sold them on" has said that he may partially refund the cost to cover repair.
Also I have taken a few more pictures and notice they say to66 on them - I would expect somwhere on them for it to state 272 - been looking on various sites for this but cannot find anyhing to confirm or dispute this.
You can actually see on the cam where something has come out of the oil feed hole and spun around in the bearing.
I will edit and post up more pictures just as soon as I get them onto photobucket - why does it always take ages for me to get the pics on there? is it my anti virus (Mcaffe) slowing things down?
Thanks for all the input guys much appreciated - just to state finally though that these cams will NOT be going in my motor unless they are repaired proffesionally.



.photobucket.com/albums/h117/slippingclutch/007.jpg[/

*Please note - just found out the to65 and to66 are the correct numbers for hks 272's *

[slipping clutch]

little picture update - I think I was a little optamistic thinking I could polish these marks out

[ashley]

Yeah- that scratch in the first picture looks pretty deep mate

[bobhatton]

The bearings will need to be welded, then reground to the right size and the cam heat treated.

I am sure that will cost more than a new cam.

Return them and get your money back

[Steve Horrocks]

The machine shop would simply plain down the flat mating faces where the caps bolt to the head (so some off the caps, and some off the head), then they can line bore to a smaller than stock diameter to match the machined cam shaft journals

EDIT: sommit like this:

Image Replaced With URL For Quote http://i354.photobucket.com/albums/r420 ... ournal.jpg

Yes- I am bored!!

It's a nice idea, but that would only lower the cam cap, it won't raise the head part to meet the bottom.

[ashley]

Agreed- you'd need to reshim the whole thing, possibly with lower than standard spec shims, but it would work

[Leakie Tbar]

Sell them to me

[DaveB19]

If you sell them you'll have the buyer coming back to you for his money back. I wouldnt use them, end up causing for damage to the rest of your engine. If you cant get your money back, buy another binned pair and make a decorative table sell that on ebay!!!!