ABF Head

[DOA]

Hmm, interesting point considering the N/A pistons and rods but OK...... Im aware of the procedure for selecting a turbo and that yes, you can do it by selecting a power output but that doesnt necessarily mean the weak links in the chain are going to agree with what you think is a nice power level for your engine. I also understand that a little bit of extra pressure isnt going to kill either the rods or the pistons but that isnt the only problem you face.

[danny_p]

the question is how much power, cant say what'll work till you know what is expected. or if there is a power output in mind can suggest combonations of bits.

the ABF  is quite a tough enigne,   leave the head std for turbo valve seat area is usefull to help keep the valves cool and abf cams are quite well suited to turbo, F all overlap but lots of lift.   the cranckshaft is pitty tough and supriseingly well balanced out the factory.


you can just stack headgakets and it'll take a fair bit of stick but stackign gaskets removes the squicsh zone  and premotes detonation so you'll have to run 97 juice and keep the boost pressures quite low for the compression,   use notched 8 valve pistons the boost pressure can rise in relation to the cr.
the NA pistons can make good power `if you look after them but get it wrong and there will be an epic fail,   feeding the engine boost is placeing a big ask on them and it used up the safty margin  if it starts detonating the heat and pressure will smash them.

the other issue is the bearing shells  ther really want changing for s2 items if you want it to last     

[topher]

All this talk of 2E blocks has sent me crosseyed. Are we saying that a 2E bottom end with a kr or abf head (breather issues aside) leaves you with a low enough CR for F.I? Or do the pistons still need to be notched for valve clearance? Random addition to the mix.. will G60 rods improve matters?

[danny_p]

basicly YES

there are other issues,   you need a 16v intermediate shaft and pully, you allso need 16v cranckshaft pullys for accsesory belt and cam belt.
some combonations seem to let you get away without doing it tho it is tight  so would have to be clayed to make sure.

G60 won't work they are 136mm not 159 mm

the cheepest way to build a 16vt  is a KR block with audi s2 pistons, rods and bearings that's meant to hold 300 ponies reliably without issue 

[topher]

For simplicity sake i think I'll go with my original plan of ABF with stacked gaskets while i'm figuring out how to bolt it all together and get the management set up then go with custom pistons/rods

[DOA]

Lol, im confused. 

If you mean that you will set the management up with stock abf pistons and an extra head gasket you will be basically wasting your time as you will have to do it all over again when you swap to uprated rods and pistons as well as having to do another engine build.

If you go with custom pistons and rods then you dont need to use stacked gaskets, even at the planning stage, you can get almost any compression ratio you want, just tell your piston supplier what you want or buy off the shelf low compression pistons which are readily available and shouldnt need any mods to clear the valves (as long as they are abf ones anyway) and shouldnt cost any more than uprated standard compression ones. Its by far the best, if not the cheepest route as it should allow you to choose what sort of power output you want relatively freely and will let you get the best from the engine straight away.

[topher]

Going completely standalone for the management with omex and digital dash pod.. i can have that wired in and set up so that i know it runs before attacking the engine internals. Further setup/mapping after that stage will be a piece of p!ss

[danny_p]

tweeking the maps  for diffrent pistons ect is easy    fine that most trubo converted cars go in for a few mapping sessions anyway  before things are spot on.  if you map it well and arn't over expectant in the power depeartmernt stock items will do.

the motor i'm working on was built from a 1Z ( yes 1.9 Diesel ).  with 8.5:1  cr