North American Turbocoupe Organization



Forged vs. Cast
lmp320 Offline
Junior Member
#1
okay gearheads, i am in the midst of a complete rebuild of a non intercooled 2.3. i am about to buy the pistons i need, and my question is, is there any advantage to having forged over cast iron, or vice versa. basically, which is best?
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Dan E Offline
Posting Freak
#2
In a turbo application you should only use the forged pistons ! The cast pistons will not hold up and you will be replacing them, the head and maybe even the block...

They must also be dished pistons in order to maintain the 8:1 compression ratio. Flat tops would bump the compression ratio to 9:1.

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Dan Eaves
88TC 5spd, Crower 5.5" Sportsman Rods, Short Wiseco Pistons bored .030" Over, Ported Head with Polished Combustion Chambers, Gutted & Polished Upper, Ported & Polished Lower, Polished T/B, Ported E6, SVO T3 .63AR Turbo, Bosch Bypass Valve, 3" DP w/No Cat, 2 1/2" DynoMax single cat back w/DynoMax Super Turbo Muffler, RR Cam, K&N in Fenderwell, Gillis Boost Valve, Centerforce I Clutch, Removed A/C, Polished Wheels, Polished Valve Cover, Polished Crank and W/P Pulleys, Walbro 255LPH HP Pump, Kirban Adj FPR, and the DAMN Heater Core is new too !

NATO MEMBER (Vice Chairman...if it's a vice...I deal with it)
Dan Eaves
88TC 5spd Vermillion Red, Polished...everything...
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**PathogeN** Offline
Member
#3
Email me sometime to see what happens to a non forged piston subjected to my foot on the floor and 18 pounds of boost (didn't know I got F'ed when motor was built). DO NOT do this.
88 Turbo Coupe (White)
88 Psudo Coupe (Silver LX)
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Noname
Guest
#4
Soon after buying my '83 it blew a piston coming up the hill. Tore it down and found that someone had put "Pinto" pistons in it. I used TRW forged pistons & it's got well over 200k on the shortblock, although it's time to do it again......another project on my "list".

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Dave
'83TC
'85TC
'87TC
'90SC

[This message has been edited by TRBOBRDS (edited 03-27-2002).]
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BJL Offline
Moderator
#5
what woudl ahppen if you used 9:1 compression psitons?
woud it blow the motor?
i think that it owudl help lkow end poiwer, but wil it blow the head off the block?

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Brian J Larkin
1988 Turbo Coupe 5spd, dark blue and shining like a peice of polished glass.
http://crazydriver358.5u.com
Brian J Larkin
88TC 320k miles
T3, FMIC ,3in stinger exhaust, gillis,
255 walbro, afpr, 5spd swap,spec clutch, sn95 5 lug,.
89 Cougar XR7 3.8SC Auto
95 Ranger Splash 3.0 auto
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Chris Ruhl Offline
Member
#6
You could use a flat top piston to get a 9:1 compression ratio, but I would do some porting work to the head and also add new larger valves, new valve springs, seats, seals, and guides. From working around high performance engines, you could also run an aluminum piston. Whatever is the case, just make sure that your upper half of the engine will hold up from your lower half.
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