Turbo piston question

[silver_82]

Which would be better. Both are about the same weight, both are about the same price. The engine is a 383 with brodix track one heads, E-85 blow through carb. 254* @.050 IN 260* @.050 EX .670 lift, 113 LSA. Borg warner S480 turbo 18lbs (Big single T6 turbo)

Option #1: Keith Black premium FORGED line. 2618 alloy Part num is IC734 It's a steped dish piston. I know their hyper pistons are JUNK but I have no experience with their forged. 9.6: 1

Option #2: Wiseco Forged 4032 alloy. Part Number is PT009h3. 9.3:1 I have always been told that 2618 alloy is best, But again I have no experience with 4032.

If anybody has some experience with either piston please chime in, or if anybody has done some reasearch please type away.

[ZR1BLAZER]

both pistons are fine. i personally would go with the weisco pistons. but they are both strong. even keith black cast and hyper pistons are strong. at 18psi i would be nevous with any piston with 9.3 or 9.6 comp but you mention E85 so your safe with either piston.

[silver_82]

The end compression ratio will be 10:1, I'm waiting to mill the heads until I pick the pistons. This motor combo should make an honest 1000 hp at 18 psi with 26* total timing. I've had an extra 383 race engine I bought years ago with a bad cam and 2 bad lifters, I got a killer deal on it and I just got a killer deal on a turbo set-up so. . . . . . guess it's gonna be turbo'd next year, The only expensive parts will be a csu carb and a neal chance converter.


I have had bad experience with kieth black hyper pistons breaking off ring lands, and they were gapped extra wide as recomended. seems to be a common issue with them. I want to give their forged line a try but I'm unsure about their reputation.

[ZR1BLAZER]

man 10.1 with 18 psi even with E85 is a dangerous set up. do some more reasearch before you go that high.

[silver_82]

I've talked to a few pro turbo builders and they say 10:1 on a blowthrough E-85 build was light, they were trying to convince me to go higher like 11:1. They also said that 26* timing was a bit low as well, I was told peak power would be around 28-30*

I thought the exact same thing as you but all of them seemed to keep telling me the exact same thing. Kevin at CSU carbs has done a bunch of similar builds without issues, Steve morris helped me pick the compression and the cam based on the head flow and vehicle specs. I talked to "Wild Bill Devine" from bullseye turbo as well. All of them had basically the same suggestions on the build.

I also looked on turbo forums, and there are a bunch similar builds that have had some great suceess.

I know on gasoline this setup would be a big no-no, I would need around 8.0:1

[ZR1BLAZER]

I've talked to a few pro turbo builders and they say 10:1 on a blowthrough E-85 build was light, they were trying to convince me to go higher like 11:1. They also said that 26* timing was a bit low as well, I was told peak power would be around 28-30*

I thought the exact same thing as you but all of them seemed to keep telling me the exact same thing. Kevin at CSU carbs has done a bunch of similar builds without issues, Steve morris helped me pick the compression and the cam based on the head flow and vehicle specs. I talked to "Wild Bill Devine" from bullseye turbo as well. All of them had basically the same suggestions on the build.

I also looked on turbo forums, and there are a bunch similar builds that have had some great suceess.

I know on gasoline this setup would be a big no-no, I would need around 8.0:1
cool. im not to familiar with the limitations of E85. myself im running just gasoline. so my build is 8.5 with a max boost of 14psi and 18 degrees total timing. with that kind of power i would just step up to some good SRP pistons or go with the wiseco pistons.

[silver_82]

I'm unfamiliar with the limitations of E-85 as well. Trust me this is going to be a big learning experience for me, as I have never built a turbo motor. I have every intention to sneak up on the power slowly by adding boost a little bit at a time, and timing a little at a time.

I currently have a n2o E-85 engine and the one and only time it showed me it's forgiving properties was when I accidently shut the fuel pump OFF immediatly before the launch and I sprayed it. It ran for 2-3 seconds before the engine shut off. I pulled off the track and turned on the fuel pump & cranked it over, it fired without hesitation. I made 2 back to back 9 sec passes immediatly after. Checked the compression when I got home and all holes were the same as when I first broke the motor in. 215psi-210psi
I was prob just real lucky

I may not even run 18psi, boost is just a direct relationship to the restriction in airflow through an engine. The heads I have flow pretty well for 23* and the cam is healthy as well so it's hard for me to guess what boost level will be achieved.

It all depends on what the truck will handle, if it'll run the number on a low boost setting then I'll leave it low boost. I'm guess-timating on the boost it will take to do the job.

[Tunedports1002]

Damnt I might just have to switch to e85 to try and keep up

[rayL]

2618 is a stronger alloy than 4032. All your nitrous/blower/turbo pistons should be 2618. 4032 is a lighter alloy more used in NA applications. How much are you planning on spending on pistons. I can get you a hook up on diamonds. PM me your details and ill get a quote.

[rayL]

[QUOTE=silver_82;163845]
I currently have a n2o E-85 engine and the one and only time it showed me it's forgiving properties was when I accidently shut the fuel pump OFF immediatly before the launch and I sprayed it. It ran for 2-3 seconds before the engine shut off. I pulled off the track and turned on the fuel pump & cranked it over, it fired without hesitation. I made 2 back to back 9 sec passes immediatly after. Checked the compression when I got home and all holes were the same as when I first broke the motor in. 215psi-210psi
I was prob just real lucky

QUOTE]

kinda kills all them to lean on nitrous will kill ya junk theories dont it!! That happens alot and the reasoning i think it doesnt hurt anything is cause.....nitrous isnt flammable so no fuel no fire. The lil bit the carb supplies is burned faster and it runs out before any real heat can be generated.