sub7

I volunteer my car for an experiment by transferring a used evo5 engine (fully rebuilt) into my evo7 chassis. The e5 engine specs are:

- 4g64 crank (94mm)
- eagle ESP H-beam Forged conrod
- Wiseco 86mm stroker piston
- 1.5mm metal gasket

Now before the engine goes in, to my surprise we bought the wrong piston or conrod. Not even we test the engine compression, the immediate result after put in the piston can be seen from this pic.

Left is stock 85mm vs right Wiseco 86mm


Closer look at Wiseco piston


So the stock piston proven the crank indeed higher stroke (94mm) but what went wrong here I think could be either piston or conrod. As far I know, the Eagle conrod length is identical with stock conrod. The pic above are taken without 1.5mm gasket, I can't imagine the compression with the gasket in it. It definitely will create extreme low compression bad for street or even race!

Could someone share with me which piston should work in my setup? Is there alternative than buying a new set of piston (since I already bought wiseco 86mm)?

2k4EvoVIII

iTrader: (15)

Im pretty sure that the 4G64 crankshaft is 100mm and NOT 94mm. Of course all my experience with the 4G64 crankshafts are from 7 bolts but i dont think there was a change ever?

EDIT: Also the deck height of the 4G64 block is taller then the 4G63 deck height. The rods are all the same length in both blocks and you make up for it with the piston wrist pin location. On a side note if you still have the 64 Block you could use your 63 crankshaft with some longer rods and destroke to a 2.1 liter with a almost perfectly square engine "High Revs!" This i believe is what you see AMS doing with all there 2.1 destroke builds.

Chris

PVD04

iTrader: (23)

I've been thinking about building a 2.2 engine and there are a couple of options.

One is to get custom pistons made with a custom pin height.

The other option is to use stroker pistons with a longer (153mm) custom rod. Using 9:1 compression ratio stroker pistons with this setup will result in ~8.46:1 compression ratio as a 2.2. A 9.5:1 would end up being ~8.93:1. This would be my preferred option as it creates the best rod/stroke ratio.

Your compression ratio (assuming those are 9:1 stroker pistons) is ~6.7:1. If you get some 153mm rods you will have a rod:stroke ratio of 1.63:1, which is much better than the 1.5:1 rod:stroke ratio of the 2.3L.

-Paul

*Edit - Just realized you listed a 4G64 crank and said it was 94 mm. Which one is it?

sub7

Thanks for the input, the mech claim it's 4g64 but clearly it isn't the case. I'd measure with wiseco piston, it's 4mm before top while 97mm when it's below. I could confirm it's 94mm but wasn't sure where the crank came about. I'll find out more and update.

konstantinosIX

I had the same issue but the gap was only 1.1mm !!!

CO_VR4

iTrader: (83)

The stock 4g64 crank throw is 100mm.

Magnus Motorsports (and probably others) offer other crank throw lengths between the stock 2.0 and the 4g64, along with the appropriate pistons and rod lengths to match the crank that you choose.

94AWDcoupe

iTrader: (125)

I sent you a PM!

sub7

Thanks for PM!

I've been offered an alternative piston from 2jz Toyota turbo piston 86mm that should do the trick. We gonna test the comp tomorrow...