bimbleuk
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| posted on 19/12/06 at 08:06 PM |
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4AGE forged pistons
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 £36 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
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ecsjwhi2
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| posted on 19/12/06 at 09:49 PM |
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Have you got a website, contact e-mail or phone number for the supplier, thanks
Cheers
JohnW
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timmy
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| posted on 19/12/06 at 11:05 PM |
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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....
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thomas4age
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| posted on 20/12/06 at 06:51 AM |
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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
If Lucas made guns, Wars wouldn't start either.
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bimbleuk
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| posted on 20/12/06 at 08:40 AM |
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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 £40 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]
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tks
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| posted on 20/12/06 at 08:50 AM |
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mhhh
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
The above comments are always meant to be from the above persons perspective.
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thomas4age
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| posted on 20/12/06 at 08:54 AM |
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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
If Lucas made guns, Wars wouldn't start either.
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bimbleuk
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| posted on 20/12/06 at 11:48 AM |
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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.
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tks
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| posted on 20/12/06 at 12:34 PM |
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nahhh
if the belt breakes and the cam goes slower...the piston goes even fast
how can it be that the piston isn“t touched!!
that would be luck in my vision...
TKs
The above comments are always meant to be from the above persons perspective.
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bimbleuk
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| posted on 20/12/06 at 03:37 PM |
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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
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