If you've got an NA 4AGE and you want to go turbo or supercharged then get a set of these pistons from Toyota direct. Forged and ceramic coated 8.9:1 pistons from the 4AGZE engine (factory supercharged engine but getting rarer).

At Ģ36 each they are a bargain and there was less than 1/2g weight difference (inc. supplied gudgeon pin) between them.
Only downer for me is I've got 3 inlet valves so for safety I'm getting a valve recess cut for the middle inlet valve. They've allegedly been fitted without but I want to be sure.

They aren't polished like an after market piston but they are more shiney than my camera makes then out to be.


GZE pistons - side


GZE pistons - bottom

Have you got a website, contact e-mail or phone number for the supplier, thanks

Cheers
JohnW

Does this mean you're going to supercharge a 20V?

If not, you might find those pistons don't give you enough compression.

I would be very interested in hearing how it goes....

Oh goodie that would sure be nice!

When the flycut is done and working, you're going to be a lot cheaper than the paradise racing Ross piston set at 500quid

are those from the toy dealers?

grtz Thomas

ps if only my gearbox and live axle would hold up

As for suppliers just speak to Tony or Tim at Fensport. They took about a week to come over from Japan. The price does fluctuate a bit for them but they shouldn't go above Ģ40 each exc. postage (from Fensport). I believe they just use standard 4AGE rings unless you want to invest in some gapless chromoly rings!

Timmy - Yes I'm supercharging. I was going to decompress with a 1.6mm multilayer gasket on standard pistons. Now I'm more likely to use these pistons with a 0.8mm gasket to get around 9-9.5:1 compression. The pistons are much stronger and the thinner gasket should also be less likely to fail.

[Edited on 20/12/06 by bimbleuk]

but if you go to touch it, it will loose its ceramic coating??

also the thickness will differ... and agan the weight difference.

also the mockup can be difficult!!

Wy not try or measure??

Tks

if the question is

do the stock4agze pistons fir the 20v engine, the awnser seems Yes.
But you've then created a nice interferance engine, do the extra flycut and you're out of trouble when the belt goes(which it'll probably never do anyway).
getting the pistons coated after machiening isn't that expensive so an option.

the denmark boys pull 430+hp from a 16V on these pistons so they should hold out pretty long before BANG

grtz Thomas

I wasn't too worried about the small exposed area after machining. The crown thickness around the middle of the piston will be untouched which is far more important for resisting the increased combustion pressures. Anyway the guy I'm using for the machine work is a bit of a guru on car/bike engine building so if hes says it needs a cut and it'll be OK I'll defer to his greater experience (also he's does this on the side so the cost is negligible).

I did accurately measure CR with the standard pistons so I can chuck some putty in there and see how close everything gets.

if the belt breakes and the cam goes slower...the piston goes even fast

how can it be that the piston isnīt touched!!

that would be luck in my vision...

TKs

Ahh well the standard Toyota 4AGE design is "safe" and I know this because a cam belt snapped on my Mk1 MR2 supercharger and all I did to fix it was put a new belt on!

My Striker timing belt jumped two teeth recently when self tensioner went too slack. 20V 4AGE and again no contact just a re-ajustment on the tensioner.

So I'd rather have some margin even if it just allows me to move the timing on the dyno safely.

Justin