UrS4 2.2T Avant project

[Thuppu]

Damper welded in small spots and cooled with compressed air so the rubber don't burn. I did also fill weld the big balance holes on the outer mass, as this damper goes in with an unbalanced crank that isn't the pair for it. The damper has been balanced aftewards at some point.

[Thuppu]

The head I was using in the damaged engine seems to be good to go. I will check the seats in cyl 5 and grind then clean.

[Thuppu]

Was in the garage for a while in the evening, drawing lots of what engine to put together. Decided to build a second ghetto engine, now even ghettoer than the last one. No need for any machining etc. so fast and easy to finish. Good thing with this is also that I can safely experiment with my M112 and K31, get everything working properly and then trow in the properly build stroker engine.




Some texture on the cylinder walls...




Had a crank laying on the shelf that needed some care.










Special damper with an extra pulley. Centered it in the lathe, and will mig weld it at work tomorrow.

[diesel des]

Yes, a nice set of new FSR pistons would be nice. I have a kit of JE's but I would need one new as the piston pin hole is slightly damaged due broken pin. I think it could be possible to order one piston. But then one piston, new ring kit and new piston pinns... We are not far away from a full JE piston kit price wise.

Maybe just now it's time to finally put together the stroker.

Do it!

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[Thuppu]

Yes, a nice set of new FSR pistons would be nice. I have a kit of JE's but I would need one new as the piston pin hole is slightly damaged due broken pin. I think it could be possible to order one piston. But then one piston, new ring kit and new piston pinns... We are not far away from a full JE piston kit price wise.

Maybe just now it's time to finally put together the stroker.

[diesel des]

It's hard for me to see as I'm just using my phone but isn't the damage to the piston just due to the weak (at this power level)stock pistons melting or breaking down? I'm sure the ring land has collapsed and the cylinder was also damaged? Get some fcp forged pistons. I have some for my stroker urq and they seem good size and quality. Not too expensive too.

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[Dima ABY]

Plus on low rpm if pistons have load they tend to twist.Supercharger may colaborate this.
Just the mechanical theory.
Waiting for a next episode of your Urs4 2.2t avant project.Hehehe
Best regards!

[Thuppu]

That could be a potential cause. After all, the piston to bore clearance was on the bigger side(of factory spec) and I did only hand hone the bores when I put together the engine. So for sure they have been oval, and also some taper.

[hammer]

A friend of me has had the same problem. Its not a mapping problem, this happens when clearance pisten to bore is no more correct(oval)

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[Error404]

of course

[Thuppu]

Thanks Alex, I think I also have 3 sets of spare stock pistons.

[Error404]

I have a couple of good sets of stock pistons Thomas

[Thuppu]

It's a standard journal bearing. I did run the stock hx40 twincharged for quite long time without issues.

[quattro-nick]

thomas,maybe is the supercharger the problem for your turbo damage.the compressor wheel might not stand the supercharger pressure.
what type of bearings has the turbo?

[Thuppu]

Have only one drivable car atm, my daily, and my wife likes it. So I have to put together another one quite fast.

Yes, stock pistons.