156 JTS Scrap engine, Can I Rebuild with TS Bottom end? - Alfa Romeo Forum
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156 JTS Scrap engine, Can I Rebuild with TS Bottom end?

Hi,all.

I recently acquired my third Alfa as a non runner project, 156 53 2.0 JTS.

I assumed the cam belt had failed and i may have to repair the head, unfortunately it seems a piston has broken up and been ground into the rest of the engine, beating up the valves and cracking the block in the process.

I now need to rebuild the bottom end and head.

It would be great if i can use a Twin spark bottom end, i was told they are the same but in another thread it states there are differences, can anyone shed more light on this?

Will the pistons hit the injectors if i use the entire TS bottom end? I suppose the answer is probably yes, if i got the same dent machined into the TS pistons would that be ok?

Is the crank sensor ring etc the same?

Any input would be greatly appreciated, let me know if you have any parts i could use.

regards Jim
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The 2.0 TS crank is the same as the JTS crank, so I assume this means the phonic ring is the same...other than that I don't know with 100% certainty. I doubt the pistons would hit the injectors, as they're in the head, but again I'm not knowledgeable enough!

David C is probably the man to ask
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Pistons will hit the injectors, this is something we tested years ago when we started rebuilding engines. You only need to skim a JTS head a little too much (within Twin Spark skimming tolerances) for the pistons to hit the injectors, there is next to no clearance as standard.

If you need any JTS engine parts PM me, I have loads of stuff in stock.
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Originally Posted by Pud237 View Post
Pistons will hit the injectors, this is something we tested years ago when we started rebuilding engines. You only need to skim a JTS head a little too much (within Twin Spark skimming tolerances) for the pistons to hit the injectors, there is next to no clearance as standard.

I now know that the head can be repaired, the damage is limited to the four valves and guides within cylinder number 2, i would like to rebuild the head i have with another bottom end, if i mill the same dent into the pistons of a Twin spark bottom end do you think that will work?
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Change the head, replace the big-end bearings, and you're done!
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Quote:
Originally Posted by themadsparkie View Post
I now know that the head can be repaired, the damage is limited to the four valves and guides within cylinder number 2, i would like to rebuild the head i have with another bottom end, if i mill the same dent into the pistons of a Twin spark bottom end do you think that will work?
Do you have in mind to use 2.0 TS CF2 pistons or 2.0 TS CF3 pistons as they are different?

If you mill the exact same dent into them then presumably it won't hit the injectors, but whether the pistons will be reliable after the milling I don't know. I'm sure the deck height of the 2.0 TS pistons is the same as the JTS or perhaps slightly lower (compression is higher on a 2.0 JTS).

You might want to use a composite 2.0 TS CF2 head gasket set to help give that little bit more clearance. But the whole thing just sounds like a bit of a bodge. If it was me doing it for my own car I would fit new JTS pistons, new rings, new big end bearings & mains, recon the head, recon the injectors and then hopefully it should all be OK.

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