has anyone really modified a NA diesel?

[2mAn]

i only ask because soon i want to upgrade the exhaust on mine with a TT setup (either 2" or 2.25")... but im the kind of guy who also wants to dumb the toilet bowl manifold in favor of something like a dual outlet + TT downpipe combo or even a full on 8v header. in addition i have an extra diesel head (from my 79 rabbit) that id like to port out and install with a mk2 intake manifold. id like to throw a cam in too, but does anyone make a cam for a NA diesel? and i want to do this all at the same time....

is this just a waste of time?

FYI my car is an 84 jetta coupe with an NA diesel. it has 274k and its still going. motor wise its all stock but i have the "Super" Injection Pump from Giles at Superior Fuel

[Darkness_is_spreading]

Well  IMO it is a nice thing to put  2.5 In  pipe with muffler,  and you could Port and Polish the head but I would take the time to PP a Turbo Diesel Head.  I would jsut save up for a TD motor,  prepare your car for the motor IE  2.5" exhaust system,  cold air intake,  make prep the car for intercooler,   but keep it NA for now get good milleage and then do the T swap.  

If you want to cam the TD motor  there is some one on the form with Cams for the TD motor, and get an intercooler.  

You could pull more power out of the NA with PP and do some pump mods,   but  are limited without a turbo.

[burn_your_money]

Is your 79 head with 11mm studs? If soit won't work on your 84. Just something to keep in mind.

If I was going to invest money into an engine I'd get a 1.9 head with a 1.6TD bottom end and go from there. There's just so much more potential.

BTW, how did the new pump feel?

[2mAn]

Is your 79 head with 11mm studs? If soit won't work on your 84. Just something to keep in mind.

If I was going to invest money into an engine I'd get a 1.9 head with a 1.6TD bottom end and go from there. There's just so much more potential.

BTW, how did the new pump feel?

im not sure about the studs on the head, i probably wont be able to use it. im just gonna have to save up for a TD motor i think, but luckily i found a shop close by that actually does stuff with vw diesels so im sure he will have something to help.

the pump iS SUPER!! made a BIG difference, these motors have really impressed me, i picked up my coupe a lil over a year ago with 250k on it, completely stock, i got some suspension, then i needed a pump so i paid a lil extra for the Super pump and im so glad i did. this engine has 274k+ and its taken a lot of right foot from me and just keeps going!!

[2mAn]

can i turn up the fuel screw on my super pump? i havent touched it at all since i got it, and its travel was a lot less than the original pump was turned up to.

[RabbitJockey]

yeah you can turn it up, it's addicting, worse than crack haha.  well atleast worse than cigarrettes, and the better you get that thing to breathe ie exhaust intake etc the more fuel you can add and the more power you'll get. i'd get an egt and then turn her up, and you can get get the cheaper ones too that are kind like a hose clamp with a needle since you won't have boost pressure behind it.  and with that you can add lots of fuel, i bet you will be able to make it smoke like crazy unlike any of our tds could since there would be alot less back pressure

[scopefrfd]

The A1 diesel toilet bowl exhaust mani on a rabbit is a very good mani, it's the downpipe dia that's too small, have a muffler shop replace the tiny tube with some 2.25...The gasser rabbits and the A2 toilet bowl manis are a joke..choke the heck out of the engine.

You can get a N/A to make td numbers.  first get some 1.7D pistons.  A 1.7d makes around 59hp stock, add a free flowing exhaust, port the head, bump the timing, gov mod, and you'll be pretty happy without the turbo hassel.  A good exhaust is normally good for 10%...so just the pistons and an exhaust is very close to stock td #'s and already better than an eco-diesel.  port and polish and pump mods and the 70-80hp range should be attainable and with less weight and heat.

One problem is the 1.7d pistons require a 1,9 HG.  the 1.6 HG the bore is too small.  

And for you turbo freaks   the 1.7D pistons have the cutout in the skirt for turbo apps, plus they're coated from the factory...ummhh yummy.  I have a set they're an 80mm bore.

[tdi4by]

How far can you bore a 1.6TD? mine has stock pistons now it is marked on the pistons 78.6 or 76.8mm I think. I will check when I get home. I have the head off and the bore has a pit in it from sitting in a junkyard with moisture........

[RabbitJockey]

the diesels can take a deep cut

[burn_your_money]

The problem might be finding pistons. A 1.9TD is just a bored/stroked 1.6TD if that gives you any ideas

For 1.6TD
Original is 76.48
1st over 76.73
2nd over 76.98
3rd over 77.48

[scopefrfd]

I have some 79.5mm  1,7's made for the 1.6 block

[rabbid79]

Where can I get some of these 80 mm pistons?

[v8volvo]

My injection pump is starting to give up the ghost and I need a new one...are you happy with the Giles pump? How much did it cost, and are they safe for biodiesel/veggie oil? What difference did it make exactly in how the engine ran--more low-end torque, more revs, ?? Last question--do you know if he's able to supply the pumps that have the fast-idle linked to the cold-start lever? That's an upgrade I'd like to make to my Rabbit.

Thanks--
George

[scopefrfd]

I'm get then from the fatherland

[lesharoturbo]

Sillly question, but if the 1.9n is a bored/stoked 1.6, why not use the 1.9 pistons and bore the 1.6?

What size are the 1.9 pistons?  They may have to be bushed or are they taller than the 1.6?


Bernie