Don't forget the revving ability, an extra 2000 RPM helps a lot.

 

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Kind of limited to turbo size if you cant rev past 6500rpms

 

that swap that i said is for n/a motors, the piston of a 4g93 is flat and if im not mistaken the piston on a 4g94 isnt. so its more compretion.
i've seen some pretty impresive mirages over here! you can see one of them on youtube putting technica turbo(its a red mirage) and then you tell me what you think!

 

My comment wasnt directed towards you, it was this one 3 posts below yours

 

Are you saying that for a N/A motor you guy's are lowering the compression and picking up HP/TQ? And that mirage does look very good.

 

other way around.

 

He said that they were putting 4g93 piston's (flat top) into the 4g94 which stock has(dome)? That would lower compression. Or did I just read something wrong?

 

I think he means that stock 4G94 pistons are concave.

 

o ok get it thank you.

 

^ yes, if they were domed, they would be well above 10:1.... which would of made a more peppy stock engine

 

so if i turbo up a 4g94 it will be better than swappin in a 4g93t? does anyone happen to know how much swapping a 4g93t into the oz would run me?

 

Im did alil research and i see some 4g63 motors are 1.8 so what yr were they using to fit the pistons in the 2.0 4g64 block? im assuming they sleeved the block to accommodate for the size. Or am i wrong?

 

If they are putting flat top pistons in to lower compression, they are doing it because they are also adding forced induction. You will notice most stock turbo cars run lower compression then most high performance n/a cars. It is easier to tune and run more boost on lower compression (8.5 to 1 for example) then it is at 10:1.

Still, it makes more sense to get aftermarket flat topped pistons designed for the engine already in the car, and then boost it.

 

Some 4G93 are DOHC and turbo, so I can see why someone would put that head on a 4G94 block so you get the benefit of the better breathing head, plus the greater displacement. That is if you live in a country where those parts can be found easy.

 

Make sure you're comparing apples to apples and oranges to oranges.

4G93 were the 1.8L engines that are being referenced in this thread. You are talking about 4G63 which is another ballgame altogether. They were never 1.8L stock at all.

If you mistakenly wrote 63 and meant 93, then I dont know what the PR guys are doing, since the 4G93 pistons are 0.5 mm smaller than the Lancer block. We explored possibilities of hybridizing when I was still 4G93 but it wasn't as easy as it seemed so I abandoned it quickly and just went with forged Lancer pistons in the Mirage block (upped my displacement to about 1.9L).