Re: Stroker piston Guru's....383 Blower Pistons
[Re: Dragula]
#2697569
09/14/19 07:01 PM
09/14/19 07:01 PM
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Joined: Aug 2003
Posts: 43,243 Bend,OR USA
Cab_Burge
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I Win
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Posts: 43,243
Bend,OR USA
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This sounds like all custom parts, rods, pistons and ring package, what stroke, which rod journal size and rod length are you wanting to use? Why use the weak, thin main webbing 383 blocks? Why not use a 400 block to start with?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Stroker piston Guru's....383 Blower Pistons
[Re: Cab_Burge]
#2697571
09/14/19 07:19 PM
09/14/19 07:19 PM
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Joined: May 2004
Posts: 12,401 Taxes & Virus's R-US, NY
Dragula
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This sounds like all custom parts, rods, pistons and ring package, what stroke, which rod journal size and rod length are you wanting to use? Why use the weak, thin main webbing 383 blocks? Why not use a 400 block to start with? I am assuming the pistons will be custom...... 383 block 4.25 stroke x 4.28 bore with a 6.535 rod
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Re: Stroker piston Guru's....383 Blower Pistons
[Re: Dragula]
#2697579
09/14/19 07:35 PM
09/14/19 07:35 PM
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Joined: Aug 2003
Posts: 43,243 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,243
Bend,OR USA
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This sounds like all custom parts, rods, pistons and ring package, what stroke, which rod journal size and rod length are you wanting to use? Why use the weak, thin main webbing 383 blocks? Why not use a 400 block to start with? I am assuming the pistons will be custom...... 383 block 4.25 stroke x 4.28 bore with a 6.535 rod I had two 440 stick shift forged crankshafts offset ground to 3.91 stroke with BB Chevy rod journal sizes with B motor mains, one for my 1969 Dart GTS H code 4 speed car and the other for a 400 block I'll build later. I bought two sets of BB Chevy type 7.100 long forged I beam rods from Speedway for both motors, neither one should make over 550 HP on pump gas, I think My first 400 pump gas 4.250 stroke stroker motor used a set of CAT 6.800 long BB Chevy H beam rods, Dan, Dram, called those pistons hockey pucks They where short and light weight
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Stroker piston Guru's....383 Blower Pistons
[Re: dthemi]
#2697986
09/16/19 09:58 AM
09/16/19 09:58 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
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Romeo MI
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Is this a race motor, gas or alky? This is his street car gas burner.. very nice looking rag top EDIT sorry wrong post.. not sure what it is
Last edited by MR_P_BODY; 09/16/19 10:01 AM.
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Re: Stroker piston Guru's....383 Blower Pistons
[Re: dthemi]
#2698214
09/16/19 08:36 PM
09/16/19 08:36 PM
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Joined: May 2004
Posts: 12,401 Taxes & Virus's R-US, NY
Dragula
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Is this a race motor, gas or alky? It will be raced mainly.....According to The Super Charger Store we will need 9:1 compression and, on pump gas, run 18psi of boost.....using water/meth injection with 2 jets...on set at 4psi and the other at 10psi....it will make north of 1000hp.....I have not seen anyone on here do this yet. They claim they do this all the time. I know of one Mopar that did similar, and it held up...
Last edited by Dragula; 09/16/19 08:39 PM.
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Re: Stroker piston Guru's....383 Blower Pistons
[Re: dthemi]
#2698527
09/17/19 06:10 PM
09/17/19 06:10 PM
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Joined: May 2004
Posts: 12,401 Taxes & Virus's R-US, NY
Dragula
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Cool, Whatever you choose, I'd for sure try to keep the rotating assy weight down. Lots of piston companies seem to recommend really heavy stuff for blown motors. I'd understand it if someone is trying to blow the crank out of the pan. I see near 800 gram pistons with 1" plus pins being sold for modest power apps too often. rotating/recip weight, and bad tunes are responsible for most of the busted stuff I see. Now that is funny you say that.....I just had this discussion with 440Source.....Was going to buy their kit minus the pistons with the light weight crank option and balance everything at our shop....Its 6lbs lighter. I have one in my 400/512. They told me, the heavier crank would be better at surviving 1000hp than the lighter one......I am pretty good at tuning an NA setup, but I have never tuned a blow thru deal, so, If I pony up the $7k for an F2 kit, this will be a first for me....But I am looking forward to doing what it seesm the entire rest of the country has been doing for a decade.
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Re: Stroker piston Guru's....383 Blower Pistons
[Re: Dragula]
#2698566
09/17/19 08:18 PM
09/17/19 08:18 PM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
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New York
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High rotating weight is comparatively harmless (although is does reduce low gear acceleration). Reciprocating weight is what breaks rods (and pulls pins out of piston), especially closing the throttle @ high RPM in the traps in which 14.7 lbs. per square inch of vacuum is added to the piston weight. With a 4.25" piston, that's 208 lbs. each... The tension load on the rods varies directly as the reciprocating weight, but as the square of the RPM: 8,000 is not 14.3% greater than 7,000 (8 ÷ 7) but 30.6% greater (8^2 ÷ 7^2).
W/r/t "they do it all the time": where is the spark set?
Boffin Emeritus
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Re: Stroker piston Guru's....383 Blower Pistons
[Re: dthemi]
#2698771
09/18/19 07:22 PM
09/18/19 07:22 PM
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Joined: May 2004
Posts: 12,401 Taxes & Virus's R-US, NY
Dragula
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Well it could be a grenade, hence a 383 block.....What is the point when the block is only good to 700hp according to most on here anyways? Ain't any of those available if I wanted one....This is more about pushing the limits with what is available vs being totally safe.....And still trying to go faster than I am currently....If we get a good tune and keep it happy, we will see. Not putting a $3500 crank in a $200 block....
First I have to find a piston manufacturer and lock in the stroke we can go with. Called Chris at The Super Charger Store, and he recommended Diamond and then Wiseco.....I will have to call...
Last edited by Dragula; 09/18/19 08:40 PM.
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