turboing an N/A motor?

[iggi]

hey everybody,

In my quest for a diesel I've come across a '89 Golf  that I'm pretty sure was originally a N/A motor that's been converted to turbo.  
Is this a good idea or a bad idea?
Am I better off waiting for a factory built turbo car, or is making your own an ok way to go?

Thanks!

[web]

Pretty much depends on how (well) it was done...

If they dropped in a whole engine + gearbox, not much can go wrong, really.

[iggi]

uh no..
N/A block, head and tranny.  They installed turbo and stuff from a wrecked TD.  Not sure yet if they replaced the IP.

[Northboundtrain]

N/A engines do not have oil squirters or turbo pistons.  I'm not the expert and have no direct experience with this, but the consensus on this forum is that the n/a engine cannot deal very well with the extra heat generated by turbo charging.

[iggi]

Thanks for the feedback.  That's what I suspected but wasn't sure.

[fspGTD]

IMO, turbochargers are great things to have on a diesel.  Whether there are piston squirters or not, turbochargers properly set up work very well on these IDI Diesels.

The TD block, with its piston-cooling oil jets, will be able to safely run more combustion chamber temperature than a non-TD block with all other factors held equal.  This is particularly important with a small restrictive turbo and exhaust, and/or without an intercooler.

With unrestrictive turbo and efficient intercooler, I find it hard to see a need for piston cooling oil jets.  With factory 1.6lTD turbo and >80% efficient intercooler, I find that EGTs are several hundreds of degrees below factory 1.6lTD temperatures even with fueling levels far beyond the smoke limit.

[jtanguay]

it would be nice to have water injection for non TD blocks though.   Inject the water on the exhaust stroke as the valve is being opened.  The extra steam would help boost as well as cool the piston

one tough setup though

[Justin]

when i get around to rebuilding a NA 1.6 i plan on adding oil squirters coming either from the main bearing oil gallies or on the connecting rods (being drilled into the connecting rods pointing to the piston and feeding from the rod journal)

and then i will be adding a turbo charger, i will need to aquire a LDA device for my injection pump

i now it has been done and i figure why not

later
justin

[chrissev]

uh no..
N/A block, head and tranny.  They installed turbo and stuff from a wrecked TD.  Not sure yet if they replaced the IP.

If they didn't replace the IP then you have an eco diesel.  All the turbo will do is pressurize the intake, and there will be minimal if any extra power created.  I can't see it causing any problems.  You will have  a very efficient engine that will probably get quite a bit over 50mpg consistently.  With the turbo pump you are supposed to get less mpg but if that is true then the non turbos must be wickedly fuel efficient because I can get 52mpg out of my 1.6 turbo diesel.  

As far as extra stress on the engine is being talked about, most people talk about the oil squirters under the pistons which cool the pistons.  The turbo increases the amount of air in the cylinders, to which more fuel is added, creating a bigger bang and more downward force on the piston, and also more heat.  I guess you could also cool the pistons from above through intercooled air coming in the intake.  Intercooled air is heavier though (more air molecules) so perhaps that would make more heat from increased amounts of air being compressed.  It is an interesting idea.  

My experience with VW is they generally don't do anything unless they have to, so running a turbo with a turbo pump on an N/A engine is definately experimental.  Personally I wouldn't do it except with an old beater engine that I didn't care about.  Definately would not do it on a fresh rebuilt N/A engine.

[Patrick]

http://www.vwdiesel.net/phpBB/viewtopic.php?t=1694

'nuff said.