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Re: Cast or Forged Pistons [Re: NAS Backyard] #1451982
06/14/13 03:37 PM
06/14/13 03:37 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,007
Bend,OR USA
Cast aluminum pistons will break and disentigrate (SP?) when coming in contact with any foriegn parts, small nuts, washers or spark plug tips or any other hard parts from any source, even detonation Forged pistons will not disentigrate, they will melt and get beat up but they won't end up in the oil pand in little bittie pieces I like and use forged piston on any build I can, I have sent customers away that wanted me to use the hypertutics pistons in there motors instead of forged ones Egge parts are way expensive and not real good quality, I think they buy from the cheapeast supplier


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Cast or Forged Pistons [Re: NAS Backyard] #1451983
06/14/13 04:38 PM
06/14/13 04:38 PM
Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
Chris2581 Offline
master
Chris2581  Offline
master

Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
CAST!! They will work with no problems.I'm using cast in my 440 ..runs 11.30's.


Nautilus Racing-
We use Superformance gaskets and Turbo Action converters/products.
Re: Cast or Forged Pistons [Re: Cab_Burge] #1451984
06/14/13 04:47 PM
06/14/13 04:47 PM
Joined: Apr 2012
Posts: 18,880
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R
RSNOMO Offline
Moparts Torchbearer
RSNOMO  Offline
Moparts Torchbearer
R

Joined: Apr 2012
Posts: 18,880
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I have to chuckle...

Here's a seasoned veteran describing the pitfalls of using cast...

All real, seen it myself...


Then another take...

'Cast will work with no problems'...


I love the internet...

Re: Cast or Forged Pistons [Re: RSNOMO] #1451985
06/14/13 05:25 PM
06/14/13 05:25 PM
Joined: Jan 2003
Posts: 16,376
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dogdays Offline
I Live Here
dogdays  Offline
I Live Here
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Joined: Jan 2003
Posts: 16,376
Literally hundreds of millions of cars have been built with cast pistons. I am sure that tens of thousands have gone down the strip in less than 13 seconds. I have seen some pretty beat up cast pistons that have been dinged by screws, nuts, valves, etc. They generally do NOT disintegrate from this kind of abuse.

Put them in a high rpm motor or run a lot of NOS past them, especially with lean A/F ratios, and they'll come apart. But I have in my collection some very high dollar forged pistons, 2618 alloy, that are pretty melted too.

Face it, for the kind of use this 394 Olds is going to see, almost any piston will get the job done.

Now to the real question, has the OP followed my lead on Doc Frohmader's 394 olds buildup yet? Doc says he took 303 grams out of EACH rod/piston combo. That's 2/3 of a pound out of EACH hole. That is worth considering for any engine.

R.

Re: Cast or Forged Pistons [Re: NAS Backyard] #1451986
06/14/13 05:38 PM
06/14/13 05:38 PM
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
L
Lefty Offline
master
Lefty  Offline
master
L

Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
Quote:

The engine is 394 Oldsmobile




If you want good advice for that motor ask questions on the HAMB

http://www.jalopyjournal.com/forum/forumdisplay.php?f=5

Re: Cast or Forged Pistons [Re: Lefty] #1451987
06/14/13 07:11 PM
06/14/13 07:11 PM
Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
NAS Backyard Offline OP
master
NAS Backyard  Offline OP
master

Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
Yea, I was working my way over to the HAMB but my piston vendor posts over there hehe !
As far going the hybrid route with other parts, my crankshaft is already being drilled for the pilot bearing. I will call the guy in PA. Thanks!
Quote:

Quote:

The engine is 394 Oldsmobile




If you want good advice for that motor ask questions on the HAMB

http://www.jalopyjournal.com/forum/forumdisplay.php?f=5




1970 Challenger Ragtop 426 4 speed 1961 Olds 88 2 dr Sedan 394 4 speed GVOD 1968 Pontiac Firebird 428 4 speed 2000 Ford F-150 2002 HD Roadking 1961 Licence Plate collection 1995 Buick Roadmaster www.nogreenautolaws.com
Re: Cast or Forged Pistons [Re: RSNOMO] #1451988
06/14/13 07:49 PM
06/14/13 07:49 PM
Joined: Jul 2008
Posts: 30,253
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,253
Florida STAYcation
Quote:

I have to chuckle...

'Cast will work with no problems'...







...take it from an Xpert ... if they work on the bEAST-side ... they will work ANYwhere !

Re: Cast or Forged Pistons [Re: dIc dOc Deity !] #1451989
06/15/13 10:24 AM
06/15/13 10:24 AM
Joined: Sep 2003
Posts: 1,465
Carson City, NV
B
babarracuda Offline
pro stock
babarracuda  Offline
pro stock
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Joined: Sep 2003
Posts: 1,465
Carson City, NV
I ran a 13.5:1 SB with KB hyperutectic pistons. No problems if you follow the ring clearance instuctions. I agree with Cab, but this is a street motor that should never see 6K, detonation or any other issues.

Re: Cast or Forged Pistons [Re: RSNOMO] #1451990
06/16/13 09:56 AM
06/16/13 09:56 AM
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383 Offline
Too Many Posts
70Cuda383  Offline
Too Many Posts

Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
Quote:

I have to chuckle...

Here's a seasoned veteran describing the pitfalls of using cast...

All real, seen it myself...


Then another take...

'Cast will work with no problems'...


I love the internet...





how the piston fails really doesn't matter, if your tune is off and you get detonation, bad things happen regardless of cast vs forged, the pounding that the bearings take can force you to have to rebuild the engine, regardless of what happens to the pistons.

hard metal goes down the intake and starts pounding a piston, again, doesn't really matter at that point if you have a forged or cast piston...it's time for an engine rebuild.


I will echo that for the mild build the original poster is looking at building, I don't see much of a reason why he NEEDS forged pistons over cast or hypers.

it's not like he's talking about feeding it 15 psi of boost with meth injection


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