Wierd stuff in cylinder block??

Holly · Post by **Holly** » Sun Jan 15, 06 6:28 pm

I spent today pulling apart one of my little 2.2s, and found something funny in one of the bores ...

3 are fine (just need a hone) but one of them has what looks like a rust band (not a problem since that would come out with the hone, but isn't consistent with the condition elsewhere in the engine) and a 1/2" x 3" patch of tiny holes that correspond with the rust mark (see the photo).

Now do you think it will need

a) just a hone
b) a rebore
c) throwing in the skip

?? Any opinions greatfully recieved!

Alex · Post by **Alex** » Sun Jan 15, 06 6:31 pm

Probably need a bore and hone job mate, looks like water has been sitting on the piston to me, has it been stood a while?

Holly · Post by **Holly** » Sun Jan 15, 06 6:53 pm

It was stood ... I guess this is going to cost more than I had hoped, lol.

Blue · Post by **Blue** » Sun Jan 15, 06 8:41 pm

I'd run a hone up it first and see if that does the trick, but if it still leaves pitting then you will have to bore it otherwise you will get blowby on that cylinder. Do it right and do it once, sometimes what looks like the expensive way is cheaper in the long run. Had to go through this with my 440, 8 good stock bores, 2 with slight water damage, no choice except to +30 it, new pistons and rebalance. Only other option open to you would be to get a liner fitted to that cylinder, might be the cheapest way out if your pistons are reuseable and the other bores are good.

Holly · Post by **Holly** » Sun Jan 15, 06 9:14 pm

Thanks guys

Terry - unfortunately thats not at option as this engine will be getting 18+psi of turbo boost rammed into it, if I get hotspots it'll go with a bang!

Blue - hadn't thought of having it sleeved, is that expensive?

latil · Post by **latil** » Sun Jan 15, 06 9:15 pm

I've run a lot worse than that,10 seconds with the hone ,bit of oil and yer done. Teach you to take the head off,if you'd started it without looking and it ran alright'you'd never have known

Use your money to build a really hot engine on a better block

Holly · Post by **Holly** » Sun Jan 15, 06 9:22 pm

I did start it, cracked up on one turn, ran fine, good compression etc etc. I started out intending to just drop it in as it was (and build another one), but had to pull the head anyway ... just as well it would seem!

TrevD · Post by **TrevD** » Sun Jan 15, 06 10:11 pm

i agree with blue , do it once!! but blue , how come you had 8 good bores and 2 bad , have you got a special V10 440

Blue · Post by **Blue** » Mon Jan 16, 06 2:11 pm

James, sleeving is not cheap but it should be cheaper than a bore, pistons and a rebalance. What I meant Trev is I had 8 unworn, straight usable bores but 2 of them had slight water damage, also the piston from one of those bores had the rings corroded into it so I really had no option.

Dave-R · Post by **Dave-R** » Mon Jan 16, 06 2:26 pm

I have a couple of cylinders with a small patch of etching on the gravity side walls. Due I think to unleaded fuel dripping in at some point??
Occupational hazard with a six pack.

One of them also has very slight water damage. Just a stain really.

Engine doesn't seem to be efected by it. Compression is good.

I just mention it to note that water is not the only thing that can damage bores.

Anonymous · Post by **Anonymous** » Mon Jan 16, 06 3:08 pm

I didnt know that unleaded fuel dripping into the bore could damage it dave. Have you got any idea why that would happen?

Dave-R · Post by **Dave-R** » Mon Jan 16, 06 3:21 pm

No idea. Unless it is slightly corrosive?

I am sure it was not water that caused it. No sign of rust. After curing a drippy carb problem it has never got worse.

Unless anyone has any other ideas?

It would probably all but vanish with a hone but I don't think it is bad enough to warrant the cost and hassle. I wouldn't want to try a DIY hone without a torque plate.

Jon · Post by **Jon** » Mon Jan 16, 06 3:55 pm

Dave B has some big block torque plates.....

Holly · Post by **Holly** » Mon Jan 16, 06 6:00 pm

I'll cross my fingers that a hone will bring it out then ...