Blown 4-banger

Ok, as some of you might know, I blew my motor. I took it apart last saturday and found that as usual I blew the ring land on cylinder 4. Anywho, I took my head to work today, and were gonna CC the combustion chambers, surface it, possibly throw it on the flow bench, then do a full radius valve job, and port the hell out of it, then maybe throw it back on the flow bench. With all this crazy head work, I want 8.5:1 pistons to go with it, to make the motor more reliable, because 20 psi with 9.5:1 compression is too much (even though after the head work I'll prolly be at like 16 or 17 psi). Bottom line...
I CAN'T FIND ANY 8.5:1 PISTONS!!!!!!!!!! HELP!!!!!

Witt

Contact diamond and get a custom set made, or use a lower compression 2.2 piston rod combo.

Blown 4-banger

How much would it cost for a set of custom diamonds?

sleepercobaltsc

j body performance has some wiseco pistons that are 8.5:1. i was honestly thinking of getting them myself. they are a little bit expensive, but still sheaper than a new motor.

HackAbuse

Screw the Eaton, get a Whipple

Blown 4-banger

The adaptor plates are almost done, we just need to get them CNC machined

victory_red_SS

iTrader: (2)

As posted in another thead try calling the fellow who is involved in my pistons.

Adam Silverthorn

Wiseco Piston Canada

Phone: (519)537-6281 Ext. 4103

Fax: (519)537-8508

asilverthorn@wiseco.com

www.wiseco.com

Archie

I wouldn't change the Rod length, because if you start going shorter, you will lose some of the torque that our motors are known for. Sure you can possibly gain horsepower, but I wouldn't want to turn into a Honda motor.

Hey witt- The 2.2L rods are only tested "safe" to 250hp, I think Blown4 is gonna be goin higher than that.

Don't forget if you can't get all the way down to a 8.5:1 piston, you can use a 8.75 piston and get a slightly thicker head gasket, that can drop CR alittle bit. Maybe .05-.1CR, but it can help. Just make sure it is a high quality gasket.

You are using ARP head studs now right? Cause our head studs are torque to yield, so they must be replaced after each use.

Blown 4-banger

Thanks a lot man! I will definatly shoot him an email!

Thanks a lot man I will definatly shoot him an email!

You don't change the stroke to lower compression. You change the dome or dish of the piston, also if you use a head gasket to lower compression, HELLO DETONATION!!!!

Archie

How does a different head gasket = detonation. It is a common thing used for the Muscle car guys. Although, I haven't done my research on Supercharged motors yet.

HackAbuse

Your car with a ported whipple, make sure you dont send me a sound file, cause i will seriously, no joke, cream my pants.

lsjwannabe

iTrader: (1)

no he was talking about fabbing the plate not porting the blower.

Blown 4-banger

No, a new head gasket with same compression is fine, new head gasket with higher compression is fine, but lowering it with a head gasket messes with the quench and allows detonation.
I'll keep that in mind

Archie

Hmm, in the 400 I rebuilt for my GTO, I lowered the CR from 10.75 to about 10.1 with piston and a slightly thicker head gasket. I never had any problems with detonation, but it might be different with new motors. Although it was only .01 thicker.

Blown 4-banger

Its different with boosted motors, detonation is a lot more touching when you throw boost into the mix.

Cobalt_Supercharged

Call Diamond you bum! I heard that you can get them done for not much more a regularly stocked piston.

Blown 4-banger

Well Wiesco said a set of 4 8.5:1 forged pistons with rings and pins is $775 Canadian... This would mean a lot more if I knew how much that is in USD

HackAbuse

$650-675 if my estimation is right

victory_red_SS

iTrader: (2)

Today that would be $669.744.
When you need to know the exchange rate go here http://www.xe.com/ucc/

Witt

umm, I'm sure he knows I meant 2.2 forged rods. There are a few more off the shelf piston choices available by ditching the 23mm wrist pin.

The only effective quench are on an ecotec contains too much of a gap to actually be effective. Anything over .045" and quench doesn't happen.

DWK5150

Contact diamond like I told ya to do how many months ago.

victory_red_SS

iTrader: (2)

You ca lead a horse to water but...yada, yada, yada

Blown 4-banger

LOL! I didn't think diamond was able to make then, considering they only sell pistons with extremly high compression ratios. I didn't think they would know how to make a 8.5:1 piston

Cobalt_Supercharged

Just cause they don't doesn't mean they can't. All they have to do is shorten the top slightly. Nevermind that concept might be a little too much for a trusted piston company that took the time to be one of the first to make pistons for the LSJ. I mean they can figure out how to make 9.5:1, 10:1 and 10.5:1 but moving the other directions takes an entirely different approach to making pistons.

You should really be looking for rods too. They aren't rated for much more than the pistons.

Red2.4SS/SC

yeah blown you need pistons and rods