Power Problem Solved UPDATE Pics
#1020103
06/25/11 08:38 AM
06/25/11 08:38 AM
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Joined: Jan 2003
Posts: 3,831 N.E. Ohio
6bblFLASH
OP
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OP
master
Joined: Jan 2003
Posts: 3,831
N.E. Ohio
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My 383 with a DLI blower on it is a pig ,so I upgraded the headers and new SS-exhaust with X-pipe. As I was going over everything I found I was only getting a little past 1/2 throttle. So I fixed that and took it out and for the 1st time made a POWER run up the road. It did run MUCH better Did is the key word: rolled into it at 40mph in 3rd. was pulling good--BANG !!! Backfired thru carb. started shaking and knocking. Fuel pressure never dropped below 8-lbs. Coasted home got it to start,knock comes and goes,idles like it has a dead hole. Oil pressure normal but pulses. Pulled valvetrain OK. Next is comp.test. I assume I took a rod bearing or even a piston. Odd thing so far is the oil is clean and there was /is no smoke and the oil/crankcase does`nt smell. Normally when I`ve seen bearings burn you can smell it as soon as you get in the motor. Maybe it pushed a headgasket between cyl.s Not exactly sure why the POP/knock/ miss order of events yet. Any feedback/experiences would be welcomed
Last edited by 6bblFLASH; 06/25/11 12:01 PM.
70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas 9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ! 2013 StickShift Challenge Winner@ Mopar Nationals!
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Re: Power Problem Solved
[Re: SRT440DUSTER]
#1020105
06/25/11 12:02 PM
06/25/11 12:02 PM
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Joined: Jan 2003
Posts: 3,831 N.E. Ohio
6bblFLASH
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OP
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Joined: Jan 2003
Posts: 3,831
N.E. Ohio
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Piston is missing ringland
70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas 9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ! 2013 StickShift Challenge Winner@ Mopar Nationals!
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Re: Power Problem Solved
[Re: 6bblFLASH]
#1020107
06/25/11 12:08 PM
06/25/11 12:08 PM
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Joined: Jan 2003
Posts: 3,831 N.E. Ohio
6bblFLASH
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OP
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Joined: Jan 2003
Posts: 3,831
N.E. Ohio
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It was making 5lbs of boost. Fuel pressure 8lbs. Carb is chinese 950 Holley89jets front/96rear. Using a boost referenced power-valve. Car is quiet and never heard pinging,but that obviously didnt mean squat Oh well back to the drawing board. It had KB- flat-tops and 9.25 cr. Next time it`ll be 8 to 1 and a blower cam.
Last edited by 6bblFLASH; 06/25/11 12:09 PM.
70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas 9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ! 2013 StickShift Challenge Winner@ Mopar Nationals!
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Re: Power Problem Solved
[Re: 6bblFLASH]
#1020108
06/25/11 08:28 PM
06/25/11 08:28 PM
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Joined: Jan 2003
Posts: 28,068 Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,068
Irving, TX
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Do the plugs have little metal flakes on them? It may have been detonation from timing that did you in.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Power Problem Solved
[Re: CW25]
#1020112
06/28/11 10:17 PM
06/28/11 10:17 PM
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Joined: Jun 2008
Posts: 10,847 Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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Quote:
They work fine but make the ring gap bigger and they are more fragile making them more damage prone when you detonate.
Don't agree with you, and I have built hundreds of turbo motors.
Even the manufacture states they are not good for boost applications, why they sell them for the application is beyond me.
Hell, just read an article in Hot Rod where they built a small block chevy with hyperjunk pistons and at 9 psi with 30 degrees of timing and 100 octane fuel laid waste to 6 pistons. No detonation was noted on the dyno and the ring gaps were set loose.
They fully admitted that they went cheap and should have gone with forged.
I'll replete- Stock cast Chrysler 2.2 pistons will take 35 pounds of boost pass after pass without fail.
Been there and done that.
Hyperutectic is good for stock rebuilds or normally aspirated builds at best.
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Re: Power Problem Solved
[Re: gdonovan]
#1020113
06/29/11 12:41 PM
06/29/11 12:41 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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I agree. The only engine I ever hurt was on a sbc with these hyp pistons. It saw 15 psi twice before the piston "shattered". I do have them in my motorcycle, and they have taken 12 psi... But I wouldn't reccomend it.
"use it 'till it breaks, replace as needed"
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