el_ke_veinte

Does someone know what, if any, is the difference beetwen a c32 block (no internals) vs c320 bare block (no internals). I need either a c32 short bare block (no heads) or if the c320 is the same block as the c32 one, a c320 bare block(only with caps) to put c32 internals and heads on it. My last alternative could be installing a iron/steel sleeve on the stock c32 block (stock liner on cyl 5 is scored) and leave the other 5 cylinders liners stock and install new piston rings in all 6 cylinders. Please, anyone with experience give me an advice. Thanks.

wawy

It might be worth a try to check out C32life.com for this information

el_ke_veinte

c32life.com is almost a dead forum. Thanks anyway. Still looking for help.

1qikctr

If only 32 motor has after market over size pistons, you can honed the 5 cyl walls, and add bigger pistons /rings. Have you try any Motor building shops? call around you never know or like you said, add some iron sleeve on the cyl, i have yet to see that kind of work done to the 32 motors. GL.

el_ke_veinte

that 's the problem, my local machine shop says it can be done (installing new iron/steel sleeve), but I have never seen it neither. And on top of that I still haven't find new piston rings.

Over size pistons, if they exist, should be super expensive (being forged) and I don't know if the damage in the liner can be fixed by boring it out ovesize.

Do someone knows what kind of grit the honing machine should have to hone the stock aluminium/silicon cylinders???

el_ke_veinte

Someone knows if the stock aluminium/silicon sleeves on these c32 engines is similar to the metal matrix liners used on honda h22/f20c engines and 2zz toyota/lotus engines?????

Zeppelin

So tell us how your engine went bad as this is probably the first I have ever heard of other than one with the rod through the block which had too much nitrous.

TVT_DESIGN

If you bore out the stock cylinder you will need to reline the walls with the same coating. These motors are similar to Briggs and Stratton or motorcycle motors with their coatings.

You can sleeve the block, but you will need to sleeve all six cylinders, as the stock MB pistons are made to work with that coating. So on top of sleeving you will also need different pistons.

I know because we're in the process of building up a motor and ran into the same problems. This was the only solution that we found.

Yes, the C32 and C320 share the same block.

el_ke_veinte

I buy the car dirt cheap with this problem (6k less than what it cost here in Puerto Rico) so I don't know what happen to it, specially when the car is in mint condition (interior, exterior, suspension, transmition). The problem is that finding a c32 engine in P.R. is next to impossible, so I have to try to fix it. Importing a engine from U.S. will make the car more expensive than buying it at the regular market price, so thats the last option.

el_ke_veinte

So the best option will be finding a used, in good condition c320 short block and swap all the c32 internals to it (pistons, crankshaft, rods, oil pump, balance shaft, etc) with new piston rings and new bearings.

pshek

Is one of the cylinders (cylinder 5) losing compression? Did you have a failure with the piston ring or piston ring land area? Got any pics of the "scored" cylinder wall?

Yeah, C32 and C320 share the same block, just different internals. I think the C350 also shares the same block too.

hooleyboy

are both blocks forged? I think its like 9K for a C32 short block

pshek

Actually, the 350 block might not work. 350 bore is 97mm. 320 bore is 89.9mm.

Zeppelin

A short block comes with crank/rods/pistons so a C32 will cost more than the C320 short block.

el_ke_veinte

Originally when the car was brought, it have damaged cylinder head gasket. When we take off the cylinder head we found some oxidation on the sleeve so we suppose that the car was parked for some time and that the water/coolant that was in the chamber make it rust, but we decide to leave it that way because it was very superficial and don't seems to be a mayor problem. Now we know we were wrong. The car runs very strong with only a small misfire problem. When we take compression we notice that the cylinder was almost dead (50 psi) so we make a leak down test and conclude the problem is those little marks on the cylinders let almost all the compression escape. We still haven't decide what to do with the car, so we still haven't take it apart again.

el_ke_veinte

a new c32 block is very expensive. A used one is still very expensive (and it don't exist in pr). On the other hand a c320 one it's a lot cheaper and if you put the c32 forged internals on it (properly done), it might work very good and cheaper than the other two options.

1qikctr

I have yet to touch m112k motor In&out, if you have the button short block apart already. Take it to a machine shop, from there, they will be able to find the right size pistons& rings... honing... etc.... it should be fine, its not like your boosting BAR+ on this motor. ( YES forged pistons can cost a lot- you have 6 cyls, labor, parts, cost a bit.) keep us posted on your solution.

TVT_DESIGN

I can source you a short block, check it out, and ship it to you.

We can build you a short block from scratch too if you'd like, but it gets expensive. Pistons are about 400.00 a piece, with rings of course.

The weight of the short block isn't all that much, maybe 150 lbs. That shouldn't be too overly expensive to ship.

FrankW

don't you mean the ML350's M112 3.7? you can run 55 forged pistons on them and run schrick cams and with the proper tuning someone made a monster W203 wagon out of it in Taiwan running whipple supercharger.

the C350 already uses the M271. different block.

pshek

Yeah, the bore sizes I quoted were for the C32 and ML350. Forgot to correct the previous post about the C350 block. If you went with a ML350 block, it's still better to use forged pistons and connecting rods from a supercharged M113K motor that will still maintain the proper stroke and compression ratio. Sounds expensive.