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In the background I am planning the engine side of things. I have done quite a bit of reading over the last year or two and it seems like there are two main areas that don't quite fit;
1. Timing belt covers
2. Intake
So, on to getting myself an engine. Basically there are two real options (third for reference).
1. Timing belt 40V engine from Phaeton (BGH).
2. Timing chain engine from Audi A6 or S4
3. Timing belt 40V engine of the 077 family (ABZ, AYS, the lot)
I am more and more leaning towards a chain engine. Open for inputs on my way of thinking;
- It is quite more compact than the belt engines and no belt cover to interfere
- Only the alternator driven from the regular belt, so open area at the front to mount it to the car (might be able to move the alternator to a position normally taken by the AC compressor?)
- BBK engine from the S4 came in manual gearbox. Due to similarities with the A6 engine (BAT, BNK) I am confident we get it to run a manual. Also flywheel etc well available.
- This engine is much more similar to the later FSI engines. For now I guess these would foul the engine cover with the high pressure pump and I am worried about the electronics side, but at least mechanically it would be close
- Due to the above similarities with FSI engines from say the RS4 and RS5, there are more exhaust manifold / header options to choose from.
Now looking at engine control side, these ones still run the DME 7.1.1. I am guessing (educated guess I hope) I would get the Phaeton engine to run using a 'Euro S6 flash' on the factory DME or swapping out the DME. It'll need retuning back to Phaeton values. For the chain engines I would think that the S4 DME would be the right starting point. I might need to map it back to A6 values if I find that engine instead. In any case, all running DME 7.1.1, so should be able to sort it out.
Now the main concern with the chain engines is... ehh... well.. the chain. But by now I think the problem is so well understood and parts readily available that I could tackle that while the engine is out anyway, if needed. Honestly it doesn't concern me that much as there are still more engines out there on the original chains without issues than the ones that have failed. My daily driver has the dreaded BMW N47 engines, well know for... chain failure. It has now done well past 200k miles and is still going strong. Yearly inspected, no issues so far.
Another good thing, the best bargain seems to be to get the engine with a car around it. Pull what I need, sell other bits which have some demand and scrap metal value for the rest... Cheaper than the engines on Ebay...
Anyway, any reason (other than the chain) to avoid the chain driven engines?
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