As some of ya know, im in process of turbocharging my engine. Its lots of work, and me and other memeber of 6GC (Edoardo from Italy), where doing some research on this stuff. Well, there was few talks going on about 4A-GZE pistons, that they could be used in to 7a, to make sure the pistons would be stronger.

Well, Edo, bought Arias 4A pistons, and he is already reasembled his engine, and.... IT NOT GOOD NEWS guys... with 4A pistons compression ratio is not like in 4A 8.5 but it is about 11 in 7a engine... Piston height is the same, but 7A piston top is cuted a bit to lower the compresion ratio, and 4A piston top is flat...

So 4A pistons are no good, exept if you gonna use bigger head gasket or custom rods to lower the CR...

The first problems begins >>

This post has been edited by doGGy: Aug 27, 2004 - 7:03 AM

Uh oh...turboing a 11:1 7A-FE wouldn't be fun. >>

Are the Arias 4A pistons for a 4A-GZE?

-Coomer+Aug 27, 2004 - 2:34 AM

insted of custom head gaskets.. why not use 2 or 3 oem metal gaskets... i seen it done when i was younger... just have to use the blue stuff betten gaskets...

i posted about doing that earlier.......i figured 3 oem gaskets and some high temp gasket sealer would lower the CR a good deal....but what would this do the HP numbers?

ok so doggy what kinda power is edo pushing with the 11:1 ratio non turbo??

jeez everytime i read a post bout turbo-ing the st i get so mad cuz they make it so hard to get some sort of power out of this darn motor lol