82 quantum cis to diesel conversion questions

[okquantum]

I have an 82 quantum coupe that is (was) 1.7L cis gas automatic.  I also had an 83 quantum 1.6TD automatic with a basket case of a body, so I saved the engine and tranny.  I've rebuilt the engine and it's ready to install in the coupe!  I've been reading the threads on gas to diesel conversions, but still have a few questions some of you may be able to help me with.

1.  Cooling.   The radiator was broken in the 83, so I saved the two-stage fan setup.  The radiator for CIS did not use an expansion tank, but I did save the one from the 83.  So, should I worry about installing the expansion tank somehow, or just use the rad from the CIS setup.  It has a fill cap on the tank itself.  I noticed that early 1.6D's in rabbits did not use and expansion tank, but I think that was NA engines.  Does the TD have a more demanding load on the cooling system, thus requiring the expansion tank?

2. Fuel Supply.  I'll remove and bypass the high pressure CIS fuel pump, and am considering what to do with the transfer pump inside the tank.  I've read that some have actually used this pump and that is does not interfere with or harm the injection pump.  My mercedes guru advises that I should not use it, just let the IP suck from the tank.  Any opinions?

Other than that, I'll build an exhaust system (3" would be good, yes?) and use the ignition wire to the old coil to switch the solenoid on the IP.  That should do it --- fuel, cooling , and a way to shut the thing off.

One more thing that may interest some of you.  The quantum engine is mounted longditude rather than transverse in a jetta.  I think all quantums sold in North America came with air conditioning, which i've removed, but the alternator is driven by an additional pully on the air conditioning compressor.  It seems I will have to retain at least the compressor housing to be able to drive the alternator.  I can't even drive the alternator directly because the snub engine mount is in the way.  Do the jettas mount the alternator above the water pump somehow?

regards,
art

[rayrayworldwide]

Can't help you with the conversion questions. But I have done an A/C purge conversion before.

I sold my complete a/c setup out of my Quantum on eBay to a guy in Sweden with a business in Texas. As a condition of the sale I would not give up the compressor bracket unless I could get a non-a/c bracket in return. My reasoning being that I could find a non-functioning compressor at the junkyard to act as a 'relay' pulley. The auction winners  Quantum (Santana) did not come with a/c. Thus he shipped me the non-a/c bracket before I shipped out the a/c system. I'm glad I didn't use the compressor as a pulley because of the potential for loss of power. Plus it would mean two MORE belts that may break.

So, the challenge to you is to find this bracket. I think your wrong about there being no non-a/c Quantums in the US. I have seen at least one non-a/c TD Quantum on ebay in the past. I have also seen non-a/c set ups on Audi cars in the junkyard that seemed like they would work. You may want to look at Audi 4000's or 100's.

Here are some pictures of my set up. Hope it helps.

[rayrayworldwide]

After looking at my post, I realized that I should have said that it is actually two brackets needed to replace the one a/c-motor mount bracket. One is the front motor mount which mounts flush against the block. The second is the small one that the alternator is mounted to.

Also, I had to get a pulley with a longer shaft length for the alternator so that the belt would line up.

Good luck!

[veeman]

OKQuantum...

I just parted out a Quantum sedan and it had the overflow bottle on it... I believe it was an 82.  I personally would put it on there if you have access to a radiator with the outlet and the overflow tank (same as the mk1 / mk2's).  The TD's can get a bit warm and I think the expansion tank helps a bit.



For your other swap questions, Have you figured out the fuel filler yet?  The gas fuel filler is going to be more narrow than the diesel one. Some say that you can pop out an insert in the gas filler neck that will allow a diesel nozzle to fit, but since you have access to the "real" part, you could use that.

Does the gas Quantum really have an aux fuel pump?  Never seen one...  There has been some discussions on here where the use of an electric low pressure fuel pump (2-3 psi?) has helped keep the IP full during heavy acceleration and somehow smoothed idle somewhat.  I have no experience with that...what kind of pressure does the aux pump put out?

For the alternator... you can see the setup in the pic posted above... that one definitely had a/c.  The rabbits / golfs /jetta's had the alternator mounted up by the injection pump, but I'm not sure how that'd fit within the quantum engine bay...I think the power steering might cause some issues, but perhaps you could use all the brackets from a Mk2 with power steering and no a/c.  Might be somewhat of a chore to find...

Best of luck!