Stock SIZE 4G64 pistons in 4G63

[1G-3G Eclipses]

I have some stock bore (86.5mm) 4G64 pistons.
To put them in my 4G63 I would have to bore the block out .60 over.

Is that too much? Would heat transfer be that big of a problem?
Are the 4G64 pistons any different?
I know I'd have to bore the wrist pin thing out 1mm, but any other problems besides that?

Oh and these are forged pistons. Thats the only reason I'm worrying about using them.

 

[BogusSVO]

whats the wrist pin location in the piston? what rods? what crank do you plan on using?

 

[jdombrow]

there the same, the 4g64 block only gets the extra displacement from the crank, thats why you can make a 4g64 block into a 2.6l stroker with special brian crower crank and rods, the pistons themselves should be the same

Ive talked to slowboy about it, and plan on using 4g64 pistons in my 4g63 stroker also


someone correct me if I'm wrong

 

[4g64fiero]

Stock 4g63 pistons are 84.98 mm for an 85 mm bore.

OP, how about building a destroked 4g64 by using a 4g63 crank?

 

[1G-3G Eclipses]

whats the wrist pin location in the piston? what rods? what crank do you plan on using?

No Idea what the wrist pin location is. That was one of the things I was wondering about since it could potentially cause the pistons to slam into the valves. Hopefullly someone can answer this.
1G Big Rods with less than 50K miles. And same 50K mile crank that I had polished.

Stock 4g63 pistons are 84.98 mm for an 85 mm bore.

OP, how about building a destroked 4g64 by using a 4g63 crank?

Yeah I know they are 85mm. I already posted that.
And how about it? It has nothing to do with my build. Im not using a 4g64 I have a 4G63 that Im JUST wanting to put the pistons from a 64 in.
But thanks for your help anyway.

 

[HIGHPSI4]

You are wrong on the bore. The 4G63 bore is 85mm and the 4G64 has a 86.5mm bore. Yea, just overbore the 4G63 block 0.060". You will have to use a destroke rods for the 4G63 if you use the 4G63 crank (88mm).

 

[tmil1]

"You will have to use a destroke rods for the 4G63 if you use the 4G63 crank (88mm). "

Why? I don't think so.

 

[1G-3G Eclipses]

You are wrong on the bore. The 4G63 bore is 85mm and the 4G64 has a 86.5mm bore. Yea, just overbore the 4G63 block 0.060". You will have to use a destroke rods for the 4G63 if you use the 4G63 crank (88mm).

Who is wrong on the bore? Im pretty sure everyone in the thread said exactly what you said.

And please elaborate as to why I would need to use a different rod.
Since the pistons part number is just a 60 over 4G63 7Bolt piston.

 

[interex]

4g63 and 4g64 pistons are exactly the same, aside from the bore size. Same height, same pin location, same everything.

If you want to make a destroked engine, you should use a 4g64 block and 4g63 crank, and then aftermarket "long rods", with 87mm Wiseco 63/64 pistons. You'll need to bore your cylinders .020.

If you want to use the 4g64 pistons (stock) in your 4g63 then you just need to bore the cylinders .060" which would really not be worth it to me because it's still going to be a 2.0L with 1.5mm bigger pistons.

 

[1G-3G Eclipses]

4g63 and 4g64 pistons are exactly the same, aside from the bore size. Same height, same pin location, same everything.

If you want to make a destroked engine, you should use a 4g64 block and 4g63 crank, and then aftermarket "long rods", with 87mm Wiseco 63/64 pistons. You'll need to bore your cylinders .020.

If you want to use the 4g64 pistons (stock) in your 4g63 then you just need to bore the cylinders .060" which would really not be worth it to me because it's still going to be a 2.0L with 1.5mm bigger pistons.

The part that makes it worth it is the fact they are are forged. and are $200.

Thanks to everyone who helped out in this thread. The old motor will be coming out tomorrow. And the new one going in around wednesday (when the shop finishes it)

 

[interex]

Hey it's your build, hope it goes well for you.

 

[HIGHPSI4]

Interex, over in your other post about building your 4g64 you posted the following:

"Also, I'm still trying to figure it out but I was told by (I believe Joe) at SBR that the Cometic 4g64 gasket will work with the DOHC 4g63 head. The rods on a 4g64 are the same as the 4g63, so you can use the eagle h-beams form the 4g63. I'd recommend buying a 98-99 4g64 block because it uses the split thrust bearing. I paid $175 delivered for my block from Ohio.

I am buying the Wiseco pistons listed here Slowboy Racing, Inc. :: DSM :: Engine :: Pistons :: Wiseco Pistons :: 4G64 (w/ 4G63 Head) :: Wiseco 7 Bolt 4G64 Block w/ 4G63 Head for my engine. They are 9.1:1 but with the cometic or mls head gasket and stock surface height I understand final compression ratio would be 8.8:1 - 8.9:1, but someone please chime in on this.

I also just sold my CP pistons tonight so I'm pretty happy with the turn around here."

You stated the 4G63 and 4G64 rods are the same (which is correct).

Up above you stated the wrist pin location on the 4G63 and 4G64 piston are the same.

The 4G64 deck height is 6mm taller. Either the rods or the wrist pin location must be different. In this case, the wrist pin in the 4G64 pistons are lower than the 4G63. If this guy uses 4G64 pistons in a 4G63 the rod is 6mm too long.

That is why I referred to a shorter rod.

 

[interex]

The 4G64 deck height is 6mm taller. Either the rods or the wrist pin location must be different. In this case, the wrist pin in the 4G64 pistons are lower than the 4G63. If this guy uses 4G64 pistons in a 4G63 the rod is 6mm too long.

That is why I referred to a shorter rod.

You're wrong.

Pin height and rod length are the same, with the 4g64 you're adding 12mm of stroke. 6mm at TDC and 6mm at BDC, the 6mm taller deck takes care of the length issue of the longer stroke. Now if you put a 4g64 crank in a 4g63 with the stock rods and pistons you'll have issues, that is why they make stroker pistons with a different pin height to make the 2.3L stroker.

 

[jimbob_843]

What would the compression be with 8.5:1 pistons with the 63 head be? Would it be 8.5 or would the head make a difference?

 

[SpawnedX]

These can't be used, they aren't forged and are higher compression. Why do people always want to cheap out on the most important components to your car possible?

Only the rods share a part number. Also you can use the 4G64 head gasket, which would be retarded to do, but it will work. Get a Titan SCE for 4G64 w/ 4G63 head.

 

[blizz99]

Bringing this back from the dead,

I have a 7 bolt 4g63 block with a 4g64 crank for my 2.3L stroker. Recently a valve dropped and damaged one of the pistons pretty bad so I have to replace it. The piston is a Wiseco 86.5mm/.060", 9.0:1 cr, 2.3L stroker piston. I was wondering if I would be able to use Wiseco part# K548M86 (here's the link http://www.wiseco.com/Catalogs/SportCompact/MiniMitsu.pdf). It says it's for a 4g64 w/ 4g63 head.

 

[blizz99]

anyone know?

 

[1fastlaser]

I would make sure on the piston. If its for a 4g64 with 4g63 head it is telling me its for the 2.4 block...

 

[blizz99]

I'm deployed so I got my wife calling tomorrow and tell her the exact piston I need. If it's the same one then I'll let you guys know for future info.

 

[viperlp01]

Ya the part number is not on there. You need 4g64 crank in a 4g63. The part number should be on the top of the piston if you have wisecos.

 

[blizz99]

Ya the part number is not on there. You need 4g64 crank in a 4g63. The part number should be on the top of the piston if you have wisecos.

I have a 4g64 crank. There's no number on the top of the piston. I got the block from a friend and they said that the piston was "custom" made by Wiseco. I was just wondering if those could be used since they seem the same. I saw that the part # I posted up didn't paste the whole number, here's the whole number K548M865.

 

[JamiesTSI]

That part number does not appear to be for a stroker application. The only way to use that part number would be to call Wiseco, give them that part number and tell them you need the wrist pin moved up 6 mm.

What I would suggest though is get in contact with the orignal builder to get what specs they told Wiseco for the piston build.