SORRY

[Terrible1]

Ah

So i'd have to do the main block too. In that case it would be easier just to swap the engines over.

Are you sure, the only part on the 1600 thats the same as an 1800 is the bottom end? I thought that it was just the head and it was restircted to 1597cc simple mod if it was swap the end guess thats too good to be true.....

Good damn VW

[Neaty]

On a 1600 drive this is what i was going to do to mine:

Twin Weber 40's
Highlift cam
Ported Head (or a GTI head if not feasable)
GTI exhasut manifold and down piper

wont be 130 bhp but will be a big difference to the 75 bhp driver engine

[Terrible1]

Sorry Si you posted while i was typing there might be light then.

Put a 1800 (i'm only talking 8v's) on the 1600 main block would fit although without chaning the pistons, crank conrods ect is there going to be that much of a difference?

Does anyone know for sure if you have to change the pistons or are the 1600 block compatible with 1800 head and bottom end. What power am i likely to lose by haveing a 1600 block compared to having full 1800 engine. Could this be made up by twin carbs or would the money i spend on carbs be more useful on changing the block.

[Neaty]

the 1800cc part is the bottom end with the cylinders and pistons, so you would have to get an 1800 bottom end frm a GTI or a 1800 GL or driver!


EDIT (as i realised i was talking rubbish)

If i was you i would leave the bottom end as it is Capacity wise and focus on the head and the carb etc, but get a lightened and balanced crank

[Terrible1]

Neaty:-

Thats excatley what i want to do. I don't understand why i can't replace the 1600 head with an 1800 one as a stright swap. If the bottom end is a 1800 why would the pistons conrdos blah blah blah will be different to that as a normal 1800 with an 1800 head?

[takethefifth]

The block is the same but its the stroke (how much they go up and down) of the pistons that was altered to reduce the cc from 1.8 to 1.6.  Changing the head has no difference on the cubic capacity of your cyclinders.

[Terrible1]

tt5th I get you 

so what advantages, power increases am i likely to get by doing as neaty says an changing the head over and getting the crank lighten and balanced.

[takethefifth]

The head will let it breathe better with the bigger inlet and outlet manifolds, the camshaft more aggressive fuelling and lightened bits will help it spin up faster. So more power and a more responsive drive but i couldn't take a guess at the HP gain. The standard 1.8gti 8v is listed at 112HP so you would be at less than that.

To hit 130hp you would have to do some serious work on the head, add a physco cam shaft, lightened pistons, balanced everything, weber twin chokes and maybe even nitrous!! I'm sure you could plumb a new engine in for less than the cost of doing all that. And plus if you did get it done you would have to uprate the brakes so you could stop again!!

[Terrible1]

tt5th:- Thanks mate 

[rubjonny]

Ok, all the carb 1600 & 1800 heads are exactly the same, so swapping will give you no benefit.  You can however fit a 1.8 GTI cam which will give you a little more HP.

The 1600 block is exactly the same as the 1800 block (it even has 1.8 stamped on it), but the crank, rods and possibly pistons (according to ETKA, but you know how confusing it is!) are different to bring the CC down to 1600.

The 1.8 carb block is exactly the same as the 1.8 GTI block, so it doesn't matter which you go for. Personally I'd get one from an automatic GL as they are less likly to have been owned by a boy racer and thrashed, but the 1.8 lump is pretty much bomb proof anyway

The GTI head has bigger valves so fitting one to your carbed lump will give you a little more HP, but you have to figure out a way to block the injector holes. (one way is to leave the old injectors in) The other issue is that the GTI head will not have the coolant feed for the inlet manifold, so you may suffer from carb icing, and the 2e2 autochoke & waxstat will not function correctly.

You could fit a 2.0 2e block from a MK3 GTI or Passat for a nice boost in torque, paired with a flowed GTI head you can get some decent HP gains too, and even with the std carb head should give you a noticable boost.
You need to do 2 things to make it fit though, you have to block the breather hole off on the front, (I'm not sure where the carb fuel pum would go, there may be another plate?) and then swap the gear from the 2e dizzy onto your carb dizzy, then get an adaptor plate to make it fit in the hole.  Both these items can be pruchased from TSR I believe

Hope this clears things up