odb2/odb1

[Geastb 0]

What are the differences in the 2 engine types? What do i have to do to make an odb2 into a odb1 engine?

I don't really want to change looms and such like - really after a cheap way of replacing my odb1 engine!

Help!!!!!!!

[binliner 0]

OBD1/2 is the engine management I believe they have different looms... whats wrong with your engine and why not replace it like for like?

[Geastb 0]

Mines smoking and using oil quite badly,, I've managed to source a low mileage odb2 engine but can't seem to find a low mileage odb1 engine. Was thinking of having mine rebuilt but it would probably be cheaper to replace the whole engine.

Not sure what to do really - if anyone has any ideas i'm open to suggestions. I don't mind spending the cash but want to do it right first time as i've been down this road before and ended up spending out twice on the same repairs!

[acf8181 0]

the main differences are that obd2 has an electronic throttle body, and thus a different inlet manifold, and also has single row timing chains. but i think theres a few other bits and bobs on the engine, wiring/sensors as well.

but if you used the inlet, engine loom, and anciliaries from your original engine theres no reason why it wouldn't work in my mind...but i've never had a good look at an obd2.

[Geastb 0]

Anyone know where a low mileage odb1 engine is? I'm getting a headache just thinking about the converstion from b1 to b2!!! lol

[VRmonster 1]

its actualy obd, for on board diagnostics, so that would be d1 and d2. lol. just nitpicking there.

[ Edited Fri Jul 16 2004, 07:16PM ]

[FishWick 21]

Only the run-out 12Vs fitted to the MK4 Golf (mostly American market) had single row chains. All MK3s and Corrados have duplex upper chains.

[acf8181 0]

ok, my mistake...so in that case all the engines are mechanically identical?

so just use your manifold, anciliaries and wiring and bobs your uncle its obd1..easy peasy.

[acf8181 0]

oh just one more q to you kev...in an article i read on vw vortex they said the obd2 engines were single row top chain (but you've cleared up that that is US only), what about the tougher top tensioner blade and bolt with a spring in? are they US only?

the significance is that obd2's top blade should be good for life...so you obd2 boys dont have to worry at 100k like us obd1's.

[VR6Rich 3]

So us OBD2 people dont have to worry then about replacing the chains/tensioners? Just that ive just passed 111k and the engine is a bit chattery and I thought it was coming from the chains. ?!

[ Edited Fri Jul 16 2004, 09:08PM ]

[acf8181 0]

yeah, the upper tensioner blade on this guys was fine at 150k...but all the rest were coming apart (where as they're perfect on mine still).

only way i guess is to set the engine to TDC, whip of the inlet, cam cover, tensioner bolt and upper chain cover. look at the blade, and the other runner you can see. if they're ok, i'd presume the rest are (you're not gonna take the box out just to check) and put it back together (dont' forget to bleed the tensioner bolt down if the piston has come out a bit) and forget about it.

heres the links (which were passed to me by vr6pete, so credit to him for finding them)...

http://forums.vwvortex.com/zerothread?id=1264409

and heres the noise if they're worn... http://www.agthompsonfamily.com/vw/TimingChainNoise.wma

[VR6Rich 3]

I see it lists the VIN numbers that the earlier/later setups were used on. Are these US VIN numbers or are they global? Also, where do I read the VIN in my car? :-)