I recently got a really good deal on a set of JE pistons and Eagle rods. I've got a rebuilt motor in my talon with 2g pistons because my old block blew a piston ring at high boost. I picked up the rods and pistons and had the machine shop bore out my old block to fit the pistons, 87mm, and now all I need is a crank. I'm planning on running the head I have right now on this new motor. I'm just wondering what size crank I need and what are my options. I looked at the chart but I'm still a little confused. With my block now bored to fit these 87mm pistons, is it possible to make it a 2.3 stroker or is going to be a 2.4? Thanks for the help.

The pistons for a stroker are different from the 2.0L pistons. Stroker pistons have the wrist pin moved up to allow the top of the piston to stay in the cylinder at the top of the stroke.

If you put pistons designed for a 2.0L 88mm stroke in a 4G63 block with a 100mm stroke crank the valves and pistons will collide. Don't do it.

If you want a 2.3L stroker use a 100mm stroke crank, stroker pistons and stock length rods.

Okay. These are the rods and pistons that I have. Are you saying that I can't use these with a stroker crank on my bored out block because I'll crash my valves? Thanks. Eagle Connecting Rod Set - H-Beam - Slowboy Racing Inc. - The performance experts for factory turbocharged vehicles.

Pretty much, if their not stroker pistons they will not work with a 100mm crank. And its not the rods that matter its the pistons. You can use any rod youde like.

Those rods will work fine. I don't know about the pistons because I can't see a part number...

All you need is the crank from a 2.4L, like the G4CS crank. Just make sure it's a 6 bolt crank.

What about if I used what I have with a stock crank?

Then it will work fine. The only reason it wont work on a "stroker" crank is because the increased stroke pushes the piston up higher, hence the reason for the wrist pin being moved up on a stroker piston.

Okay. What will using the stock crank do as far as the displacement? Will I have a 2.4L?

With the stock crank, you will still have 2.0L. The only ways to increase displacement are increasing cylinder bore and increasing stroke. To increase stroke, you would need a non-stock crankshaft with increased stroke. To accommodate the increased stroke, you would need stroker pistons. The ones you have are not stroker pistons, they are 2.0L pistons.

So having my block bored out didn't do anything to the displacement?

a littl bit but nuthing really noticable

2.3= 100mm crank, stroker pistons, std length rod
2.4= 100mm crank, g4cs/4g64 block, std length rods and 87mm pistons for 2.4

Boring the 4G63 has little effect on displacement. See the chart at http://www.dsmtuners.com/forums/str...acement-various-combinations-bore-stroke.html the effect of changing bore and stroke on displacement and peak piston acceleration.

92_talon_awd said:

So having my block bored out didn't do anything to the displacement?

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No... your still a 2.0.... just a 2.009 or something similar, .

Boring is simply where the cylinders are widened & tapered to alleviate any ridging caused from previous wear, not for added displacement.

Nice chart Maurice, mine has more cranks listed, but I do like the piston acceleration numbers on yours.

It would be really interesting to see the peak piston acceleration value that creates sonic choking at the valve on an unported, stock valve sized head (both 1G and 2G port designs) at different boost levels.

Boost levels do not materially change the mach number. Mach is a velocity measurement. As long as stock valves are in use all versions of the 4G63 have the same mach number through the valves at the same volumetric air flow. At any mach number higher boost will have a higher mass flow and more horsepower though. Boost is good.


The below is quoted from http://www.kidzuku.com/StrokeOrNot.pdf :

"But the speed of sound is still the same as in1951. The hemi has an intake valve mach
index of 0.51 at the 4000 RPM where max hp is developed. The 4G63 has the same .51
intake valve mach index at 8000 RPM. When the 4G63 reaches the mach index of .51
it's turning twice as fast as the hemi and with 15 pounds of boost is breathing more than
twice as many pounds of air than the 331 hemi at 4000 RPM. Boost is good."

Click to expand...

The 331 CID hemi was referenced because that's the engine I put in my 1948 Plymouth coupe while in high school. It was a beast but my stroked talon would run circles around it.

Boost levels do not materially change the mach number. Mach is a velocity measurement. As long as stock valves are in use all versions of the 4G63 have the same mach number through the valves at the same volumetric air flow. At any mach number higher boost will have a higher mass flow and more horsepower though. Boost is good.

Click to expand...

Volumetric air flow, right on. Schooled me again Sir.

The below is quoted from http://www.kidzuku.com/StrokeOrNot.pdf :

Click to expand...

I have a bound copy of your excellent paper. Maybe I need to review it again soon...

The 331 CID hemi was referenced because that's the engine I put in my 1948 Plymouth coupe while in high school. It was a beast but my stroked talon would run circles around it.

Click to expand...

I'm jealous, when I was in HS I drove a FWD 1980 1.6L N/A Subaru GLF1600. The spare tire was mounted to the top of the air cleaner.

OP, sorry for off topic posts, hope you don't mind.

I don't mind, I'm learning so it's all good. Looks like I got screwed on these pistons and bored out my old block for nothing, dang.

without doing the math it looks like it maybe a 2.1L

TSIMonsteR said:

No... your still a 2.0.... just a 2.009 or something similar, .

Boring is simply where the cylinders are widened & tapered to alleviate any ridging caused from previous wear, not for added displacement.

Click to expand...

If I'm reading that chart right, it says that with a stroke of 88mm, a bore of 87mm and stock piston position that the displacement will be 2093cc, wouldn't that be like a 2.1L? Just trying to figure this out. Thanks.

Here is a picture of the pistons I have next to a 6 bolt turbo piston, are these stroker pistons?

No those are 2.4 pistons.

So can I use them in my bored out 4g63 block with the eagle rods I have and a 100mm crank to create a 2.4 stroker? I'm getting a lot of conflicting information here, confusing.

That piston is if you were going to build a headgasket eating 2.4L motor. It's basically the 4g64 (normally 2.4L single cam) block with a 4g64 100mm crank, with those 87mm pistons you have there, with a 4g63 head.

If you want a 2.3L you use a 4g63 block, with a 4g64 crank, high wrist pin set piston, stock rod length.

The 4g64 block has a bigger bore (87mm) AND a taller deck to allow for the long stroke without the piston coming out the top of the deck. If you put the 100mm crank in a 4g63 (normally 88mm) you need to make up for the extra 12mm the piston is traveling up. Thus, move the piston wrist pin up 12mm which will bring the top of the piston 12mm down, keeping things square again.

And boring out your block to a 87mm ups your displacement to like a 2.04L or something. Your off a whole decimal point.

So I can't use these pistons in the block I have now, even though the bore is right? The machine shop screwed me, they led me to believe that I could use these rods and pistons with my block bored out and a different crank. No wonder they hooked me up with them so cheap. Guess I'll have to try and get rid of these pistons and get some high wrist pin pistons.
By the way, do 2.4L motors have problems with blowing head gaskets?

I must be getting the displacement wrong also;
I'm calculating (pi/4)(87mm)^2(88mm)(4) = 2092.53cc or roughly 2.1L. Are my calculations wrong? Thanks.