1.8GTI motor in Mk1?

**hiho** · 29-03-2010, 12:58 PM

Hello all,

I'm after some pointers for fitting a 1.8GTI Cab motor in a Mk1. No, I havent gone off diesels, me and James (hessiethecrab) will be instaling this motor in his Mk 1. We have the manifolds, fuel injection system, ignition, oil cooler, radiator, gearbox and gearbox mount.

What we dont have is a fuel return line, drive shafts or any idea how to get the fuel injection working.

We would probably prefer to replace the fuel injection with a carburettor. What would be reccommended for this motor/car combo? WHat else do we need for this installation?

Cheers everyone!

Matt

**dubai gti** · 29-03-2010, 07:26 PM

Best to either go for a twin-weber set-up or what I run..a single 44IDF Weber and Oval Ramflo filter.....which is still pretty thirsty, but sounds great

**Peter Jones** · 29-03-2010, 08:29 PM

It'll pretty much bolt straight in. Is it a K-Jet or EFI motor? There's a few differences in what you have to block up depending on which you've got.

There's a bit of info in my Ziggy thread which was a GLD to Cabrio 1800 conversion. There's also a few other bits and pieces kicking about the place.

Keep asking questions and I'll hunt down the photos and posts for you.

Ziggy's thread. http://www.vwwatercooled.org.au/newf...ad.php?t=38301

My wreck to racecar thread's got a lot of info in it too along those lines (Link's in my sig below)

Easiest choice of carb for a daily is a twin barrel progressive like a Weber DGV,DGAV DCD etc on a Passat TS manifold. All you need to feed it is one fuel line and an electric pump, a Facet monoblock unit or similar should do the trick.

Bigger carbs need more fuel, if you go up to single or double sidedraughts then a Carter rotary vane pump is the answer.

Grab a couple of shots of you new motor and your destination engine bay and we'll be able to see what's going on a point you in the right direction.

Pete

**Peter Jones** · 29-03-2010, 08:30 PM

Oh, forgot to mention that to put an 1800 into a MK1 you need a GLD top radiator hose. The bottom one is the same.

Pete

**Jarred** · 29-03-2010, 09:04 PM

if you have all the Kjet injection gear, it's not too hard to put it into the diesel (since it was meant to be in a mk 1 after all)

so don't rule it out straight away. I'd only install the Kjet if I knew the system was in good working order before hand though.

**jayjay** · 29-03-2010, 10:30 PM

Originally Posted by Jarred

if you have all the Kjet injection gear, it's not too hard to put it into the diesel (since it was meant to be in a mk 1 after all)

so don't rule it out straight away. I'd only install the Kjet if I knew the system was in good working order before hand though.

make sure you actually have every single bit of k-jet gear too though.

otherwise ---> up the creek no paddle

**hiho** · 30-03-2010, 10:42 AM

Thanks everyone!

Its a K-jet motor with the injectors in the head (i think). I'll take some pics tonight.

Its going into an LS, so theres no return line. Other than installing a diesel tank and lines, are there any other workarounds here for the k-jet?

As for carburettor choices, will the standard 1.6L carby work? The desired outcome is a stronger, more reliable and fuel efficient car that doesnt wuss out on hills. With Weber carbs, does anyone have experience with jetting etc?

Cheers,

Matt

**hiho** · 31-03-2010, 01:39 PM

The motor is a JN, a low compression 1.8. Why would this motor need a fancy oil to air oil cooler?

**Oneofthegreats** · 03-04-2010, 10:30 PM

Originally Posted by hiho

The motor is a JN, a low compression 1.8. Why would this motor need a fancy oil to air oil cooler?

I don't think there is any real need to run any oil cooler.

I don't even run one in my turbo'd setup..

If K-Jet conversion's are "not too hard", everyone would be doing it.

If you've got some good tools & can read & understand working component & wiring diagrams, you're half way there.

I'd suggest hainvg a look through both Pete J carby'd conversion & my own K-jet conversion.

I'm sure there is plenty of helpful info & pics.

If in doubt just ask.

http://www.vwwatercooled.org.au/newf...ad.php?t=38088

This is the very simplified wiring diagram I made for the K-Jet electrical system quite some time ago

It doesn't have the TCI switch in there for electronic ignition, but I can draw that up if need be.

The fuel pump relay is also a ignition triggered setup. Meaning, if the engine stalls, the fuel pump will stop.

You can also just wire in a normal relay if need be & run straight off ignition power as I had to once I fitted the MSD ignition setup.

So as soon as you turn the ignition on, the fuel pump runs & if the engine stalls it will continue running. Not very safe, but a normal relay is also alot cheaper than a $100+ proper ignition triggered relay!

Hope this help's.