94mm crank Pistons???

[CoopsCoupe]

Im looking at a 94mm Crank, and I would need a piston that has the wriste pin moved up 3mm. Anyone have any idea where to look? I talked to slowboy some time back but they really didn't seem interested. Anyone have any ideas? Maybe I just talked to the wrong person. Any Thoughts???? Thanks ~CLIFF

Does anyone have any suggestions? Im in the middle of my engine, and need a direction to go.

Do NOT Bump Your Threads.

 

[Black95awd]

I have not seen a shelf piston for this application as of yet. Correct me if I'm wrong.

 

[CoopsCoupe]

I know there isn't. Eagle says to have the piston moved up 3mm but no piston manufacture will do it. Im trying to get suggestions on someone taht will. I talked to Slowboy but I don't think they took me seriously....

I mean, the piston is custom, I understand but Im looking for a company that will do pistons.

 

[dsmconvict]

Any piston company will make you custom pistons for the right price.

 

[aaannntt1965]

CUSTOM PISTONS :: Automotive Custom Pistons :: Ross Pistons
try this link. i am sure they can help you with pistons.
look in the second set.

 

[tom04841]

Why not go with the 100mm crank and get the stroker pistons? Most companys stock these now, and you won't have the added expense of a custom piston.

 

[TunaTalon]

Or you could go with a normal stroker piston with the pin moved up 6mm and a 153mm rod.

This would be a little better rod ratio than the stock 150mm rod and make a good compromise between the 2.0L stocker and the 2.3L stroker.

Try Brian Crower for 153mm rods. That is probably the size they use for the 106mm crank.

 

[CoopsCoupe]

Well since I have posted this I have had companies call me at work wanting to help me. Manley will not do custom pistons. Arias will not either. JE is calling me today and Ross is going to help as well. Slowboy jumpd on this and I am also dealing with them. I want the best product for the best price. But I just wanted to thank SBR for jumping in to help where as they left me in the dark. But I don't want a longer rod. You can make more stress points for a longer rod. The higher the pin on the piston the weaker it becomes. I want rods that have proved therselves time and time again. and the pistons I don't want to wild but I am willing to pay for what I want. I don't like the 100mm crank. To much stress on the cylinders... but that is not what I am posting about. Companies are coming through for me and I am very thankful. Thanks for the post and the help. I'll post more as I hear more.

 

[CoopsCoupe]

Well, been working on this for a while now and Still have found no easy answers. Making a piston seems to be the only way out of my hole. Now, I got a post about 153mil rods?? Where are these at? I went to brain Crowers website and I didn't see any of them. So any help would be welcome.....

 

[interex]

You can get stroker pistons for the 94mm crank. I do believe Nick Arias at Atomic Speedware has a set for around $450 or so.

 

[CoopsCoupe]

No, I just looked. They have them for the 2.4, 2.3, and 2.0. I need the pin up 3mil. Im still looking for pistons. I wish someone did make them. It would make my life much easier. Anyone else have any options??

 

[interex]

Call up and ask if he has the 2.2 Stroker pistons. You can even google --> 2.2 Stroker 4g63 - Google Search

 

[CoopsCoupe]

I have but nothing is clear for a 1g.... I will call though... I don't understand why a company would make a crank and there be no pistons to fit them. I have called arias, well, I havn't but I had a machine shop do it and they said they didn't stock it.

 

[interex]

If you google 2.2L Stroker 4g63 you can see 3 companies who do make the pistons off the bat. I remember once before on a site seeing pistons for a 94mm crank. I myself would just move away from that crank and just do a 2.3L stroker and be happy with it or a destroked 2.4L

 

[Freerevving]

The Answer Is Simple... but a good question...

you just use regular stroker pistons with the 4g63 rods

or you can use regular 4g63 pistons with the stroker rods, but I don't recommend this since the rod ratio is not as good.

hopefully you can see the small print

 

[interex]

Using the regular stroker pistons with a 94mm crank will result in much lower compression, you're going to have a 6mm gap there.

 

[delta448]

If you google 2.2L Stroker 4g63 you can see 3 companies who do make the pistons off the bat.

Wow. And I thought Magnus internals were expensive.

I'm surprised there aren't more options for this stroke size. Maybe instead of moving the piston pin or ordering custom oddball length rods, you might try using a 156mm rod, a set of pistons with the stroker pin location and a super thick 3+mm head gasket. I know the SCE is available as thick as 0.093" (2.325mm) right off the shelf, and I'm willing to bet that a custom thickness HG will be much less than one-off rods or pistons. I also like this better than a 150mm rod and using stock pin location because you may as well improve rod ratio if you're still going to have to solve the 3mm discrepancy problem at TDC.

If my math is correct, using a bore size of 85.5mm, buying 8.5:1 CR stroker pistons and using a 2mm thicker than stock headgasket will net you a final compression ratio of 9.3:1. If you can have a professional reshape the combustion chambers a little, taking 2cc's out of the chamber or the piston crown (or combined) should drop CR back down around 8.8:1. This is the cheapest theoretical solution I can think of when designing around the odd 94mm crankshaft.

 

[interex]

If you ask me, that's too much to worry about. Where did you even get a 94mm crank without the option to get the right pistons?

 

[CoopsCoupe]

Straight from Eagle. I wanted it for the best idea... Rev and Torque. Best of both worlds. But they don't offer pistons for it.. Yeah I know y? they don't have an answer. The only way to do it is to use 153 mil rods but I can't find them either. My parts list isn't a cheap list. Thats for sure so it isn't like this is the most expensive investment.. Anyway, I need an answer quick. Im alreay red, actually purple I missed the shot out. SO im trying to reslove this fast. I love the diagram. Thanks man. But im not going wit a smaller rod and Im not usiung a huge head gasket. I need to make up a -3mm and Im lost. Im not cutting 3mil off the top either, timing belt wouldn't work and horrible hg seal..... Any other options or answers? I put what you had in the google search now. This is for a 6-bolt block to....

 

[CoopsCoupe]

Well, thanks to you guys, im on this idea of getting evo PISTONS for a 2.2 form cosworth, which are 33mil comp height. Im looking for 31.81349. So im thinking that I get them. I have my eagles made to fit the evo pin which is a 22mil like a 2g. Get a 1.5 mil head gasket and it will lower the comp ratio from a 9:1 to like a 8.1:1. Not to good with comp ratio math. Anyway, I really wanted a 8:1 ratio. So it works out good on paper. Now Im looking at you guys asking, WHAT DO YOU THINK? The headgasket idea is the key I believe with making the piston ratio what I want. I also am wondering about machining my brand new eagle rods out to fit a 22mil pin. ANy ideas on this, im throughing it on the table................................

 

[CoopsCoupe]

Freereving, a 100nn block is acutally 6mm of movement more. Thats y a 4g64 is 6mm higher. and Stroker pistons are 6mm shorter. Im still 3mm to short from the correct piston to deck clearance.......

 

[CoopsCoupe]

I would be needing a piston with a comp height of= 31.81349mm / 1.2525in = 8.5 ratio( i think.)

 

[delta448]

The only way to do it is to use 153 mil rods but I can't find them either.

You could use custom pistons with only 3mm higher pin location (instead of the 6mm difference in pin location on stroker pistons). But whatever, if I had to pick one or the other I'd probably choose custom longer rods before custom pistons too.

I need to make up a -3mm and Im lost. Im not cutting 3mil off the top either, timing belt wouldn't work and horrible hg seal.....

What if you used a 2.4L block? I understand you don't want to let go of your precious 6-bolt, but I'm pretty sure the extra deck material available and the ability to use 156mm rods might ease your pain a little.

If the deck were machined to only +3mm over a 63 deck height, you'd only be taking 6mm in slack length out of the 2.4 DOHC timing belt, or adding 6mm in tension to the stock 63 belt. Also, you'd know there was plenty of material left for resurfacing, and you'd have a larger bore for more total displacement. Just a thought, I doubt you'll seriously entertain this idea, but you did say "any" other options.

Freerevving: I don't know where you'd go to find 147mm "stroker" rods but; usually for a 2.3L a 100mm crank and a 150mm stock rod length is used, along with pistons with a 6mm higher pin location. Tomei is weird... and expensive.

 

[CoopsCoupe]

I have a girdle and the block is perfect. I have had to dead machined on. I have about 4 blocks so it don't matter what I do.. But I still have all the parts but the pistons. I bought a magnus girdle and everything I need. Im looking for a piston. Read my last post and tel me what you think about the evo pistons....

 

[Freerevving]

and Stroker pistons are 6mm shorter. Im still 3mm to short from the correct piston to deck clearance.......

So they are... hmmm... you can just get some from Tomei... they're only 3mm shorter. Eagle also knows where to get 31.65mm height pistons. Look around they're available. I know Mahle won't do custom... but I know everyone else does and it's usually only $75 more for the set. I would call Wiseco first.

Optimally, you want a longer rod (153mm) with a shorter piston.