Sohc Forged pistons - 3000GT/Stealth International Message Center

Ondontii · 09-10-2005, 11:20 PM

Where can I start searching for these. A friend of mine said to just call the places that do the dohc pistons JE, ROSS, Venolia, wiseco.....blah blah and ask them to grind in the sohc valve reliefs instead.

Im very worried about the sohc valve reliefs, because they are cut/formed very deep in the stock caste pistons, and there is very little material left holding the side of the piston in place. I broke off the edge of 5 pistons because there was so little material there.

Anyways, I just want some help because Ive never gone piston shopping before. Im looking for stock bore. Im just going to hone the cylinders, and throw the new pistons in with some total seals using a gapless top ring. Hopefully a low tension oil ring also.

8.0:1 Looking to run 15+ psi on pump gas. Damaged the stock pistons at 9 psi because I had the ignition advanced too far.

Ondontii · 09-12-2005, 06:03 PM

Well, apparently I can get the venolias for $61.50 a piece, just need to mail them my one piston that is still good so they can get the sohc valve reliefs.
Probably need to do some calculations to make sure Im getting the CR I want.
$500 with pins and fit isnt bad. Ross was going to cost $590 just for pistons and nothing else.

Now Im shopping for some totalseals (top gapless). At least these dont have to be custom.

VR-4 0wnz j00 · 09-12-2005, 10:32 PM

Sounds good man. I think your probably the first to do a piston upgrade on the SOHC. Good luck with it!

Ondontii · 09-13-2005, 01:27 AM

Well, I just dont think the sohc pistons would hold up to 400whp enviornment no matter how well I had things tuned.

I know of one guy named "chief" who overbuilt his sohc. Ross pistons, Pauter rods (WHY!!!!??!!!) forged crank. his rev limiter is 6200......not sure what the pauter rods are for.

I believe there is a sohc 3000gt that has forged pistons.......but is N/A.......not sure why in the world he did that. He has all the RPW goodies.
Insane amount of money spent on.........a car that still aint gonna be fast.
http://www.3000gt-sohc.com/

BaDLaTiNo · 09-13-2005, 08:49 AM

Im fully building my SOHC and putting a single turbo on it. Its getting done as we speak.

Ondontii · 09-13-2005, 08:03 PM

im having a real pain with the piston pins. Im going to have my piston shipment stalled not because I will have to take all the pistons out now and take them to a machine shop somehow (walk there????) just so I can mail 1 piston to Venolia.

Super C · 09-13-2005, 08:36 PM

DO NOT SEND THEM ONE FROM YOUR ENGINE!

Go buy a stock piston from the dealership and send them THAT instead. I sent my existing piston from a blown motor to Ross and had them cast to that spec and they all came back a little too small for boost. If your pistons were melted, chances are the 'good' ones are heat shrunk. Safe yourself the hassle of having to rip the engine apart (again) and send them a new OEM piston.

Also, the CP pistons for the 3rd gen eclipses will work. I have those in my setup now.

SUPERTOM · 09-13-2005, 09:43 PM

subscribed!! Havent heard much SOHC talk in a long time

Ondontii · 09-14-2005, 02:29 AM

Quote:

Originally Posted by Super C

DO NOT SEND THEM ONE FROM YOUR ENGINE!

Go buy a stock piston from the dealership and send them THAT instead. I sent my existing piston from a blown motor to Ross and had them cast to that spec and they all came back a little too small for boost. If your pistons were melted, chances are the 'good' ones are heat shrunk. Safe yourself the hassle of having to rip the engine apart (again) and send them a new OEM piston.

Also, the CP pistons for the 3rd gen eclipses will work. I have those in my setup now.

Im sending my piston to Venolia simply because they are a lot cheaper. Anyways I am not reboring the block, I will just hone it out. I am going to get a stock size forged piston. They need a little more clearance anyways.

I didnt melt any pistons. I shattered them from detonation. Im quite sure there was no extreme shrinkage.

I also found today that cylinder #1 ate its rode bearing. Somehow the Crank journal still looks great (bearing wrapped around it and seems to have protected it). I will plastigauge the crank and have the rod resized.

When it comes to building the piston, Im just going to use their own base design for the dohc piston in stock size, and have them cut in the sohc valve reliefs based on the piston I send. Im sure They would rather do that then sit and copy my sohc piston and end up screwing me.

It was good to have some friends show up just as I was pulling my bad bearing/conrod. I was mystified. One of them had recently developed rod knock in his SR20 and he was amazed at how good my crank journals still looked compared to his.
Hopefully my crank is okay and I can get this thing together in a month. Waiting for pistons is going to suck. Might look into a crank scraper or who knows what else.

Learning this stuff is nice, but I really wish I had a beater to drive around.

Super C · 09-14-2005, 11:13 AM

Personally, I still think you should buy a stock one and send them that one, but it's your decision.

I'm not saying they'll cast the piston any larger, but it's safer and more precise with a new one than the in-engine one and to me well worth the extra 60 bucks. I too thought that the 'good' piston would be fine. Oh, and my engine went because of detonation too.

At any rate, good luck and post the results.

09-10-2005, 11:20 PM	#1 (permalink)
Ondontii SOHC you in the FACE Join Date: Feb 2005 Location: Seattle and SaltLake Trader Rating: (0)	Sohc Forged pistons Where can I start searching for these. A friend of mine said to just call the places that do the dohc pistons JE, ROSS, Venolia, wiseco.....blah blah and ask them to grind in the sohc valve reliefs instead. Im very worried about the sohc valve reliefs, because they are cut/formed very deep in the stock caste pistons, and there is very little material left holding the side of the piston in place. I broke off the edge of 5 pistons because there was so little material there. Anyways, I just want some help because Ive never gone piston shopping before. Im looking for stock bore. Im just going to hone the cylinders, and throw the new pistons in with some total seals using a gapless top ring. Hopefully a low tension oil ring also. 8.0:1 Looking to run 15+ psi on pump gas. Damaged the stock pistons at 9 psi because I had the ignition advanced too far. Last edited by Ondontii : 09-10-2005 at 11:26 PM.

09-12-2005, 06:03 PM	#2 (permalink)
Ondontii SOHC you in the FACE Join Date: Feb 2005 Location: Seattle and SaltLake Trader Rating: (0)	Re: Sohc Forged pistons Well, apparently I can get the venolias for $61.50 a piece, just need to mail them my one piston that is still good so they can get the sohc valve reliefs. Probably need to do some calculations to make sure Im getting the CR I want. $500 with pins and fit isnt bad. Ross was going to cost $590 just for pistons and nothing else. Now Im shopping for some totalseals (top gapless). At least these dont have to be custom.

09-12-2005, 10:32 PM	#3 (permalink)
VR-4 0wnz j00 Meglomaniac Join Date: Dec 2003 Location: Charlotte, NC Drives: 94 3000GT Trader Rating: (2)	Re: Sohc Forged pistons Sounds good man. I think your probably the first to do a piston upgrade on the SOHC. Good luck with it! __________________ 1994 Mitsubishi 3000GT Pearl White Base Mods: Intake Southbend Rally Clutch (was Spec Stage II Clutch) Fidanza Lightweight Flywheel 3SX Test Pipe ek2 Downpipe 3SX Front and Rear Poly Motor Mounts Removed Resonator Show: Custom Sub Box by Dedona Kicker Solo Baric S12L7 - Stolen Kenwood 800W Amp - Stolen 18" Motegi FF7's Black with polished lip

09-13-2005, 01:27 AM	#4 (permalink)
Ondontii SOHC you in the FACE Join Date: Feb 2005 Location: Seattle and SaltLake Trader Rating: (0)	Re: Sohc Forged pistons Well, I just dont think the sohc pistons would hold up to 400whp enviornment no matter how well I had things tuned. I know of one guy named "chief" who overbuilt his sohc. Ross pistons, Pauter rods (WHY!!!!??!!!) forged crank. his rev limiter is 6200......not sure what the pauter rods are for. I believe there is a sohc 3000gt that has forged pistons.......but is N/A.......not sure why in the world he did that. He has all the RPW goodies. Insane amount of money spent on.........a car that still aint gonna be fast. http://www.3000gt-sohc.com/

09-13-2005, 08:49 AM	#5 (permalink)
BaDLaTiNo LLaMaCaKeZ User Join Date: May 2004 Location: Miami Drives: 2x 3000GT Trader Rating: (0)	Re: Sohc Forged pistons Im fully building my SOHC and putting a single turbo on it. Its getting done as we speak. __________________ Red 98 3000GT SOHC-T: Putting mod list together. Blue 94 3000GT DOHC: Stock for now

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09-13-2005, 08:03 PM	#6 (permalink)
Ondontii SOHC you in the FACE Join Date: Feb 2005 Location: Seattle and SaltLake Trader Rating: (0)	Re: Sohc Forged pistons im having a real pain with the piston pins. Im going to have my piston shipment stalled not because I will have to take all the pistons out now and take them to a machine shop somehow (walk there????) just so I can mail 1 piston to Venolia.

09-13-2005, 08:36 PM	#7 (permalink)
Super C I'm HISPANIC dammit! Join Date: Aug 2000 Location: Santa Monica Drives: SOHC Monster Trader Rating: (1)	Re: Sohc Forged pistons DO NOT SEND THEM ONE FROM YOUR ENGINE! Go buy a stock piston from the dealership and send them THAT instead. I sent my existing piston from a blown motor to Ross and had them cast to that spec and they all came back a little too small for boost. If your pistons were melted, chances are the 'good' ones are heat shrunk. Safe yourself the hassle of having to rip the engine apart (again) and send them a new OEM piston. Also, the CP pistons for the 3rd gen eclipses will work. I have those in my setup now. __________________ '99 base GT - slightly modified ----------------------------------------- Balanced engine-CP forged pistons @9:1-Pauter rods-Total Seal rings-Clevite bearings-Stage 2 port and polish-3-angle valve job-Quaiffe LSD-Autometer boost guage-3SX dual EGT's-Custom downpipe-Redneck dual exhaust w/Andretti Turbo Muffler-Polished plenum-EGR block off plates-3SX motor mounts(polished)-3SX stage III clutch-Fidanza flywheel-3SX lightened crank pulley-NGK platinums-VR-4 head gaskets-Redline tranny fluids-Kenwood Excelon reciever with mini keg-Alpine 12" sub in a box

09-13-2005, 09:43 PM	#8 (permalink)
SUPERTOM Gas Cyphoner Join Date: Feb 2003 Location: CLAYMONT, DE Drives: 95 BASE SOHC Stealth Trader Rating: (1)	Re: Sohc Forged pistons subscribed!! Havent heard much SOHC talk in a long time __________________ PERFORMANCE:RiPP Headers,Maximal Catback,MSD (6AL Box, Blaster Coil, Wires),3SX Pulley,DOHC TBw/plenum port & coolant bypass,K&N filter w/HomeDepot Performance pipe & Supermac coldair wall, Topline GroundWires, Ek2 Plenum Spacer WEIGHT LOSS:Removed (AC,SRS,crash bars,rearseat,tar, GasTank Shield,extra wires). Race seats,Hawker 12lb.battery. Hollowed trunk/trunklid,replaced random unseen bolts w/zipties, solid motormounts,CF Evo hood, Took a big dump --> SUSPENSION:Ground Control, New KYB's, Front/Rear Strut bars, Dohc rear Anti-sway bar, Irotors brake upgrade

09-14-2005, 11:13 AM	#10 (permalink)
Super C I'm HISPANIC dammit! Join Date: Aug 2000 Location: Santa Monica Drives: SOHC Monster Trader Rating: (1)	Cool... Personally, I still think you should buy a stock one and send them that one, but it's your decision. I'm not saying they'll cast the piston any larger, but it's safer and more precise with a new one than the in-engine one and to me well worth the extra 60 bucks. I too thought that the 'good' piston would be fine. Oh, and my engine went because of detonation too. At any rate, good luck and post the results.