polo gt engine rebuild

i have done a polo gt conversion in my golf and i think the previous owner must have mistreated the engine pretty bad as its not making the best of noises :/

i did do an aav single point conversion last year and have it sat in my garage all complete on carb ready to go

the problem i have is that the golf is my daily so dont really have the time to rebuild the engine or the skill to do it in a weekend,

will the AAV block and crank fit the GT as im thinking of rebuilding the bottom end of the AAV and when done, putting it in the golf on the GT engine

the obvious thing that i spot straight away is that it has a timing belt tensioner whereas the GT uses the water pump, so obviously the cambelt will be different….i dont exactly want it jumping a tooth after alot of work

i know the flywheel is the same and the gearbox will offer up, but will the head match and what do i do about the cambelt if this sort of thing can be done

I'm assuming its running on the full GT managment yeah? if so yep you can swap the base block over for the GT stuff, just wont be quite so high power. the gt management will all fit and work great with it, what you'll have basically is the same thing as the MK3 Polo 1.3 MPI but with a better ecu map. you could swap the GT cam into it too for a bit more power as well.

what I dont understand is what you say about the cam belt tensioner? the AAV polo has the same tension setup as the gt, that is its all done via the waterpump thats how my gf old 1.3v polo AAV engine was done.

unless later AAV engines differ? but if so the engine itself will swap in still, GT inlet wil bolt to the AAV head fine.  if you want to be 100% positive, buy new GT inlet and exhaust manifold gaskets, then test fit to the AAV head. if they match, yay

cheers!
thats a step in the right direction then, but will the gt rods fit in the aav engine block and on the crank, i was thinking about keeping everything else standarg gt stuff as the head and ancillaries ect,

basically will the aav block match to the gt cylinder head…..so ive only changed the BARE block and fit gt crank, rods, pistons, oil pump etc

as for the tensioning, gt defenantly waterpump tensioned and the aav defenantly has a seperate tensioning roller with the water pump driven from the oppesite side of the belt, using the flat side to drive it rather than the toothed side, so would i have to use the aav cam belt?

cheers for info so far!

oh i see, you want to open the gt and swap the goodies over? if so yeah gt head fits right on the aav block, i had one on mine.
crank & conrods are same on the GT and AAV, am pretty sure block itself is same too and the difference is in the pistons only.

pics of the aav? any idea age of car it came from? in theory you should be able to fit the GT timing belt and bin the separate tensioner. are you 100% sure its an aav though, im 99.9% sure all mk3 polo engines use the same tensioning setup. AVS dont show any other belts, and they're usually spot on:
http://www.vwspares.co.uk/polo_belts.php

ETKA doesnt show this other tensioner either

even more good new then!

im not near the engine at the moment but i bought the engine and gearbox from a bloke who broke cars and he told me it was from a 1994 1.3 mk3 polo and he said it was an aav…i ran it on a carb but was so slow and the carb was so unreliable and so bad on fuel  i went and swapped for a gt

the block defenantly had a tensioning roller and a modern waterpump becuse i changed the belt on it when it was out

so you are saying if its the correcgt aav block i can ebuild the bottom end as an aav and then just put the gt pistons onto the aav rods and bolt head to it?

i shall take photos when i leave work but the seller told me it was a genuine mk3 polo aav 1.3 with only 62k on clock  

thanks again

or are the polo aav pistons the same as the gt pistons??

and also is the gudgeon pin pressed onto the rod through the piston or is it a circlip  :dontknow:

94 is right on the changeover year from mk3 to mk4, so this cvould be the reason for it you actually have a mk4 (6n) polo engine. this certainly will have the later belt setup with the tensioning roller. or the other thing it may have had a replacement engine that the guy wasn't aware of, so just went off the engine code on the build sticker thinking it was original.  if it is a 6n engine then it'll likely be a 1.4 rather than 1.3, which is good news at least.

looking at it theres a good chance the head will still swap over, but internals wont.

another givaway, did it have a power steering pump?

the aav pistons are different to the gt, but the pin and rods/crank all same. so gt pistons will fit aav rods, and pistons + rods fit aav crank etc

im not sure if it had a power steering pump

by looking at it how can i tell if its a 1.0 or a 1.4 as i believe these were both in the 6n….if it is a 1.4, will the gt head fit to it and what will i gain from that…havving a 1.3 fueling a 1.4?? will i need to do any modifications such as head skim to make up the difference or what….and if the cam sprocket has the same amount of teath then ill have to use the aav belt?

will i be better off power wise, rliability etc with the gt 1.3 or with a 1.4 bottom end

surely it would make it an ABF bottom end if it was a 1.4??

you mean ABD the abd was only found on mk3 golf and early seat ibiza, dont think it made it to the polo 6n but i think a very similar variant was fitted, close enough where it matters anyway.

head compatibility and that depends on the age/code of the 6N block, once you know that I can look it up for you.  best bet for now is to find out the engine code then we can work from there

1.4 is always gonna be better than 1.3, more power and torque, reliability will be the same if not better, assuming its been well looked after.

pics, pics and more pics! part numbers off the belt tensioner setup, mounts, brackets and and any other bolt on bits will help me too, block and head numbers probably wont help but post them up anyway. if the head casting matches the gt one then thats a givaway its a block based on the mk3 polo ones at least

http://tinypic.com/r/e8wlmt/7

http://tinypic.com/r/20zcqvc/7

http://tinypic.com/r/11hqmgj/7

http://tinypic.com/r/2uz2bdi/7

http://tinypic.com/r/21j7zmv/7

http://tinypic.com/r/33m8mqh/7

no way thats a MK3 polo engine, for a start look at the engine mount bracket! its a MK4 polo lump. plus it has an alloy rocker cover, a knock sensor, and a bolt on breather unit. the AAV engine had non of these things.

now you need to find the engine code if you can. maybe try to find part numbers from bits on the engine, check that alloy engine mount bracket on the side for starters and the tensioner wheel

hi, ive got a 1.3 polo and was planning on putting my gt engine in, are you saying i can leave the existing 1.3 block in and just swap the head + pistons?

i asked about this on club polo and they just advised me to put the whole gt lump in,

you can fit the gt head if its a later polo engine but it wont gain you much, all the good stuff is in the bottom end. tho you will at least get a nice cam if you only change the head

number on the mount is- 030 199 275….underneath it is AHB 11

a random number on the block is- 80 HBH

i couldnt find any numbers on the block…..will this help or do you want me to find anymore?

part number is 95-00 polo, for engine code AEV, ADX or AEA

so is that a 1.4 or a 1.1 or 1.6 or what??

would the polo gt inlet manifold fit on the mk4 head, as ive decided to rebuild the polo gt engine and need sumthing just to run about with as its my daily

cheers

cant tell you that I'm afraid, not without the proper engine code. all i can say is it definitely isnt a MK3 Polo AAV engine!  if i was you i would buy a new GT inlet manifold gasket to start with, then you can offer it up to the head to see

where abouts is the proper engine code then please

according to elsawin it is on the gearbox end of the block, just above the flywheel