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.

 

[delta448]

I don't have much time to work out the math right now, but from what you wrote the Evo pistons sound like a reasonable solution. Is the advertised compression ratio of the Evo pistons 9:1?

 

[CoopsCoupe]

yes, a longer rod would be better with a stroker piston but I would rather stick with a rod that has proven itself. but yeah a 153mil rod would be great but I think I have to go with a piston because I don't see an 153mil rods for a 6-bolt

 

[CoopsCoupe]

I don't have much time to work out the math right now, but from what you wrote the Evo pistons sound like a reasonable solution. Is the advertised compression ratio of the Evo pistons 9:1?

yeah it is advertissed 9:1. I don't know what to math would be to come out with a good comp ratio...... im shooting for 8:1 or just a tad higher

 

[delta448]

Okay, so I had a look at the CR math.

Assuming that the Evo head has the same volume combustion chamber, and if I did the math correctly(which would probably be a miracle), the compression ratio would be around 8.76:1 with the Evo 2.2 pistons and 1.5mm HG. However, I don't know if the Evo head's combustion chamber is the same volume, so I obviously can't quite assume the CR would be the same if those pistons were installed in an engine with a DSM head. That would throw my math right out the window.

 

[CoopsCoupe]

the specs are a little higher than what i was shooting for but what if i went with a 2mm thick head gasket? plus im also worried about machining my eagle rods out 1mm, do you think it would dramatically weaken them?

 

[delta448]

I came up with 8.42:1 with the 2mm HG. As for the rods, I wouldn't expect it to cause them to fail under normal conditions and reasonable power levels, but yes they will lose a little strength.

 

[CoopsCoupe]

for the compression ratio that i want i would need 3.437 cu.in to equal 8:1. we're expecting to push this 4g to about 600whp. im really worried about how the rods would hold with 30lbs on them. plus with the added head gasket thickness ill also be looking at an extra weakness.

 

[Freerevving]

http://www.dsmtuners.com/forums/stroker-tech/265190-considering-2-2-a.html

the 4G37 (1.8L) has 153mm rods... don't know if the bearing journals are the same, but worth looking in to.

TOMEI Connecting Rods

 

[CoopsCoupe]

my evo piston idea went to shame because i forgot about the bushing in my eagle rod it cant be machined and i cant keep enough material on the rod for strength. im workin with somebody as we speak i have the deck height and the ccs of my head so im gonna go all out and make a custom piston. but other suggestions are welcome.

 

[delta448]

Keep us updated.
Let us know what the final engine configuration will be. Also, I'd like to know the piston specs and price when it's all settled.

 

[Freerevving]

I hate being wrong

sorry about the bad info

 

[CoopsCoupe]

Well, Im looking at about 650 w/rings or 700 w/rings. The reason for the price differance is that the quality of the piston and the manufacture. Anyway, I went with a piston company that actually sat down with me on the phone and with no charge spent an hour on the phone. I have all the spec's that i needed and gave him. Not even 10 mins later, he came up with a cost. Including shipping. The Evo would have worked but I believe a thicker head gasket is raising the hand for a problem. Second, the pin can not be made bigger on a 1g eagle rod. I know I could just take the bushing out of a 2g eagle rod and put it in the 1g rod but the material around the rod to keep it strong would be way 2 weak. I guess I just wrote to correct myself to save someone else a headache as I have had for sometime now. Custom piston or Rod is the only way to go for now Until Im done trying to convince that there should be a shelf piston. But with only about 4 of these cranks out for a 1g it is hard to say what will happen. And If a custom rod is to be made I would suggest going longer with 2.3L piston than a stock piston. The rod/crank ratio would be horrid....

 

[Strm Trpr]

Well, Im looking at about 650 w/rings or 700 w/rings. The reason for the price differance is that the quality of the piston and the manufacture. Anyway, I went with a piston company that actually sat down with me on the phone and with no charge spent an hour on the phone. I have all the spec's that i needed and gave him. Not even 10 mins later, he came up with a cost. Including shipping.

So, who did you call, and what is their phone number, or web address...

I am planning a 4G64 longrod stroker with the Eagle 94mm crank, Manley 156mm Conrods, now I just need to get that piston with the wrist pin moved up 3mm...

The Euro and Australian Evo guys run this true 2.2L and they are revving them over 8500rpm.
pi*((8.65cm^2)/4)*9.4cm stroke*4 cylinders = 2209cc's or 2.209L

So, what's that phone number, I'm so eager to get started.

 

[CoopsCoupe]

So...anyway, I got my pistons about a month ago. (sorry for not posting lately). Mad props to MIKE at SLOWBOYRACING, they got me a good piston for a damn good price. The pistons are being static balanced now. The with the crank and rods spun for the best balance. I wouldn't go with a longer rod as a longer rod is more room for failure, where as a -6mm piston has been proven over 800whp so moving the pin -3mm isn't going to hurt anything.

 

[Strm Trpr]

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

Actually, you'd want to use standard 2.3L stroker pistons, the 94mm crank and custom rods that are 153mm long.
Static Balance the entire rotating assembly.
Then spin balance the entire rotating assembly and include a Fluidamp, flywheel of choice, clutch disk and pressure plate to ensure an ultimately balanced set-up.
Deck Height - 229mm
Conrod - 153
Stroker Piston - 29mm
Crank - 94mm/2 - 47mm

So, 229 - (153+29+47) = 0
This is what I'm going to build.
It'll be a 2.16L.
It'll rev much better than a 2.3L stroker and make more torque than the 2.0L.
2.3L rod ratio = 1.5
2.16L rod ratio = 1.63

 

[gman991057]

Hey Strm Trpr, what block are you using? and where are you getting your pistons from?

 

[Strm Trpr]

If the 92.5 - 94 7-bolt blocks have 1g 6-bolt oil squirters in them, and if I can use a 2gb oil pump, then that will be the block I will use for my build.
I want to retain the use of oil squirters because my motor will road race, and any extra lubrication can only help keep temps in check.

I got ahold of Pauter today, and they said they among other high end manufacturers like Carillo, Oliver to name a few can make custom 153mm rods for use with any 2.3L stroker pistons and the Eagle 94mm crank.

Does anyone know if the 1g 7-bolts utilize the 6-bolt type oil squirters?
Does anyone know if I can use a 2gb 7-bolt OEM Front Case/Oil Pump on a 1g 7-bolt block?

Does anyone know if you modify the 2gb 7-bolt block with the new Evo Oil Squirters.

I'm not into the 6-bolt swap thing, and it is actually illegal in California.

 

[Strm Trpr]

Well, according to Magnus, the 1g 7-bolt has oil squirters like the 6-bolt.
Magnus Motorsports - Crankwalk Tech

I would like to find a 92.5 - 94 7-bolt block, throw a 94mm Eagle crank in it with 153mm conrods and 2.3L stroker pistons for a 2.16L with conrod/crank ratio of 1.63.

 

[gman991057]

Bump! for an update!

 

[MyEclipse97]

Bump for update...