ABF Head

[jacko16v]

they will lower compression yes, but you can also lower it by stacking 2 metal ABF head gaskets.  It does sound a bit dodge but it works and is a nice easy & cheap way to go about it. have a look for posts made by 'toyotec' on clubgti, he has been running boost on his this way for a long time, and he makes good power.  If you want to fit 2e pistons to do it iirc you need to machine them to make valve cutouts?  I think toyo used 2e rods as they're a bit beefy at one point, but not sure if he took them out again after.  When he talks to you you have to work very hard to keep up with what he is saying 

Will have a look into his posts, 2E would be nice as i have a full engine sat in the garage that is no good to me, i know stacking gaskets is a option but i would rather fit pistons if i can. Will be able to get pistons cut for valves not a problem.

Cheers

[DOA]

Out of interest, you mention cams but are they specifically designed for a turboed engine?

[danny_p]

abf cams work well with turbo.    buy forged rods and be done with it

[jacko16v]

Gonna go with the 2E rods on abf pistons and stack 2 head gaskets after speaking to a few people. Will get some pics up soon on progress.

[DarnPB]

Are the 2e pistons designed for turbo use? Its not just how much they lower the compression by, but also how much more heat they can take as well as actual stregnth. A melted piston due to over boosting or wrong piston fitted is not a nice thing to find. Found a few on aircraft piston engines where the wrong piston had been fitted to a turbo charged engine after a top overhaul. Just because they look the same, does not mean that they are the same.

[Diamond Hell]

(he's talking about 2E rods not pistons)

[DarnPB]

That will teach me to read the whole section properly!  :embarassed:
Pistons were mentioned in an earlier reply, didn't see the later post. I'll get my coat!

[jacko16v]

Yeah not fitting the pistons, just the rods with abf pistons. Should work fine.

[DOA]

Same point still stands, abf pistons arent designed for turbocharging but then, using 2 head gaskets isnt a good way of lowering compression either so......... Doubtless itll work if you keep the boost and rev limit down and build everything else properly but for a few hundred extra pounds you could get a much better engine out of the job and run some proper boost levels. Same goes for the rods too but hey.

I asked about the cams as I thought he had mentioned using uprated abf cams which probably wouldnt agree with a turbo conversion, stock ones should though as said.

Out of interest, have you sized a turbo yet and decided on a boost level to use?

[danny_p]

your not really meant to pick a boost pressure,    pick a power output, from that you can work out pritty much your ideal CR and get a good ideal of how much boost is needed at what sort of CFM   so picking turbo should be quite easy.