[Mk2] [Turbo] 272's again

[slipping clutch]

finally my 272 cams arrived BUT not as described as one cam has some heavy scoring on the journals - there is no chance of getting my cash back so the next question is how can this be repaired?
Apolagies for the poor photographs- camera phone

[calum4492]

my eyes aint the greatest but if they are repairable i imagine they would have 2 be ground back and ud need 2 set clearances

[slipping clutch]

I did think about just spinning them up in a lathe and trying to polish it out with some very fine emery BUT the scoring is to deep and extensive for that on one journal. the perils of buying used I guess but I'm pretty stressed about this at the moment

[dantheman]

Excuse my nievity but whats the problem with running it as it is? The score is radial so its not got an asymmetric profile to it. If its not protruding it wont damage its bearing area. It should still lubricate. Whats the harm in using it like that?

[slipping clutch]

So if I made sure nothing was protruding by spinning it in a lath with fine emery paper I should be able to get away with this? hope so because for the first time in nearly 7 years I'm considering breaking the car and finally getting something up to date and modern that I'm NOT in the least bit tempted to fiddle with.

[Chris]

If you are going to use them, they need repairing correctly. I would not fit them after emery clothing them off or similar.

You would not do it with a scored crank, so why even consider it with the cams!

Unfortunately you have been shafted with them. How come they can't be returned? Paid cash?

[Super_red]

I'd be tempted to use them as they are, the scoring looks to be around the centre so you should still get a bearing seal at the sides, this will make oil pressure and lubricate the cam, it has 4 other bearings on it so its not as critical as a crank.

I would not touch it with emery paper, just use a good cam gloop when fitting.

[Chris]

Yeah.

Fit them. Rattling cams in a high performance engine is not an issue.

What is the worse that can happen? The oil pressure is not held correctly causing more head damage? The oil pressure is not held correctly and the turbo starves of oil? Nice rattly engine? Inconsistant valve clearances?

Go for it

[calum4492]

i agree chris +1

u should take them 2 an engine builder and c what he has 2 say if they are useable or not

[Leakie Tbar]

u should take them 2 an engine builder and c what he has 2 say if they are useable or not

Thats more like it

Don't take anyones word for it on here!! take it to the above there the experts

it is very difficult to see the extent of the scoring don't scrap them on peoples say so they may be repairable!!

[slipping clutch]

I agree with the above comments - even if i did attempt a diy fix on these I would never be happy with them - just waiting for that odd sound or knock and I would immediatly think it was the camshafts.
I'm seeking proffesional help as we speak

[calum4492]

who u taking them 2?

[slipping clutch]

I've gone to an affiliate on here for advice who is speaking to an engineer on my behalf. Also doing a search on Google on the subject I have found a specialist engineering company only 12 miles from me who may or may not be able to help - Christmas shut downs etc. mean I have not had a reply yet.

[calum4492]

gdgd well i hope they can fix them for u bud

[Super_red]

Yeah.

Fit them. Rattling cams in a high performance engine is not an issue.

What is the worse that can happen? The oil pressure is not held correctly causing more head damage? The oil pressure is not held correctly and the turbo starves of oil? Nice rattly engine? Inconsistant valve clearances?

Go for it

Why would they rattle or put the valve cleanrences out if the outer part of the bearing is in tollerance? Just reduces the bearing surface thats all.

To the OP, dont emery paper them, if you cant measure the tolerances then get a Pro to but I would not bother getting them re ground if thats even possible at all on the MR2, isnt the bearing surface machined into the head?

[Chris]

You can tell they are not damaged on the outside from them pics??

You ever worked on old cars with worn cams? They rattle suprisingly enough.

[calum4492]

put a set of damaged cams in an engine and take the risk?
i cant imagine it would last overly long

[Super_red]

You can tell they are not damaged on the outside from them pics??

You ever worked on old cars with worn cams? They rattle suprisingly enough.

You can tell they are? I am advising to check and use if ok, they wont rattle if the journals are within tolerance for the full radius of the cam as long as its both sides of the oil feed.

[Super_red]

put a set of damaged cams in an engine and take the risk?
i cant imagine it would last overly long

depends how long you want it to last, the marks will transfer onto the bearing races in the head so you will not use another set of cams in the head again but they could do 20k without issue, that would be 10 years in my MR2 then at worst a new head when a new set of cams is aquired.

[Chris]

So you would fit them in your fresh built engine ready to push high bhp?