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Stroker pistons, AKA "hockey pucks"
#1009801
06/09/11 01:38 AM
06/09/11 01:38 AM
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Joined: Aug 2003
Posts: 43,902
Bend,OR USA
Cab_Burge
OP
I Win
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OP
I Win
Joined: Aug 2003
Posts: 43,902
Bend,OR USA
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I'm in the middle of assembling my next low deck stroker motor, 505 C.I.bracket motor. It is a 400 block I bought several years ago from AndyF  It will have a 4.25 stroke Ohio Crankshaft CO. crank, bore is 4.350, 6.700 CAT forged steel H beam rods with BB chevy sizes on both ends and a set of custom Diamond pistons that should end up around 12.5 to 1 comp. ratio depending on which cylinder heads I use and the CC of the chambers. I thought I would post the pictures and some information on them, this is the first high compression bracket motor I've built from scratch since I moved to Oregon back in 2005. The pistons are not a max effort class pistons, but there not a shelf piston either    They weigh 722.25 grams with the rings,spacers, retainers and wrist pins. The pins are the standard .990 pins as far as I know, not the real good stuff like the ultra lightweight tool steel short rascals that are avialble from Diamond, maybe next time  The piston in the rear is a 1970 TRW 383 +.060 Magnum stock replacement piston. BTW, I remember why I don't like dual spiral locks on stroker pistons for low decks using long rods  Enjoy 
Last edited by Cab_Burge; 06/09/11 01:40 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Stroker pistons, AKA "hockey pucks"
[Re: Cab_Burge]
#1009802
06/09/11 05:28 AM
06/09/11 05:28 AM
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Joined: Dec 2009
Posts: 21,195
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,195
in a cattle trailer down by th...
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They look purty. 
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Stroker pistons, AKA "hockey pucks"
[Re: Guitar Jones]
#1009803
06/09/11 07:08 AM
06/09/11 07:08 AM
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Joined: Oct 2008
Posts: 492
South Jersey, NJ
DragDart360
mopar
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mopar
Joined: Oct 2008
Posts: 492
South Jersey, NJ
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Sounds like a sweet build Cab. I'd guess it will run pretty sweet too.
70 Dart Swinger, 2850 lbs
SB 408, Bullet roller 264/268 @50 .636 SSDS stage 2 Edelbrock heads, 1 7/8 Headmans, 1050 dominator by Dom, 9.867 @ 133
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Re: Stroker pistons, AKA "hockey pucks"
[Re: supercomp]
#1009808
06/09/11 11:08 PM
06/09/11 11:08 PM
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Joined: Aug 2003
Posts: 1,314
Charlotte, NC
LSP
pro stock
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pro stock
Joined: Aug 2003
Posts: 1,314
Charlotte, NC
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Quote:
I hope your going to run a vacuum pump with those rings.Quote:
Why is that?
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Re: Stroker pistons, AKA "hockey pucks"
[Re: supercomp]
#1009809
06/09/11 11:57 PM
06/09/11 11:57 PM
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Joined: Aug 2003
Posts: 43,902
Bend,OR USA
Cab_Burge
OP
I Win
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OP
I Win
Joined: Aug 2003
Posts: 43,902
Bend,OR USA
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Quote:
If you have to cut the block deck to square it up you'll have a positive deck height. I hope your going to run a vacuum pump with those rings.
The deck hieght is -.009 on one number 1 and right at +.003 on number 6  That was doing a quick check to see what it ended up at, I will check all 8 tomorrow  I wasn't planning on running a vacume pump on this motor due to being told that these rings are the stock ring sizes used in the new car motors like the LS1, 3rd. gen Hemi and the modular Ford V8  Diamond furnished the rings with the pistons, I told the rep I work with that I wanted a standard tension oil ring, not a low tension oil ring The oil rings are tiny and they don't seem to have a lot of tension when moving them around in the piston ringlands with my fingers I guess I'll see  BTW, are you or have you used this size rings in a motor and if so what where your results?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Stroker pistons, AKA "hockey pucks"
[Re: Cab_Burge]
#1009813
06/10/11 12:51 PM
06/10/11 12:51 PM
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Joined: Jan 2003
Posts: 2,697
Renton Wa
topfueldart
master
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master
Joined: Jan 2003
Posts: 2,697
Renton Wa
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Quote:
Quote:
how much hp are expecting out of this one Cab?
At least 400  It depends on which heads, intake, carb and the dyno More than anyone in Florida can make with the same parts
11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.
9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.
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Re: Stroker pistons, AKA "hockey pucks"
[Re: supercomp]
#1009814
06/10/11 12:56 PM
06/10/11 12:56 PM
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Joined: Aug 2006
Posts: 610
long time lurker, short time p...
PorkyPig
mopar
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mopar
Joined: Aug 2006
Posts: 610
long time lurker, short time p...
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Quote:
They will have less wall tension and less contact. With crank case pressure instead of vacuum it will make the rings job harder. Pressure makes it harder for rings to stay seated against bottom of ring groove. Yes we've used them with good success, but with a pump. JMO
Are you saying this about any 1.5 mm, 1.5 mm, 3.0 mm ring pack? I'm asking because Mahle sells a bunch of PowerPack replacement pistons with this same pack and these are intended to be pistons for street cars that I wouldn't expect to be using a vacuum pump.
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Re: Stroker pistons, AKA "hockey pucks"
[Re: Cab_Burge]
#1009815
06/10/11 01:12 PM
06/10/11 01:12 PM
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Joined: Nov 2004
Posts: 2,825
Sk. Canada
RemCharger
master
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master
Joined: Nov 2004
Posts: 2,825
Sk. Canada
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Quote:
Quote:
how much hp are expecting out of this one Cab?
At least 400 It depends on which heads, intake, carb and the dyno More than anyone in Florida can make with the same parts
Makes perfect sense. If you can get it up to 550, you should be able to make mid 9s.
You go balls to the wall, make 650 horse, you're staring at low 8s 
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Re: Stroker pistons, AKA "hockey pucks"
[Re: Cab_Burge]
#1009817
06/10/11 02:04 PM
06/10/11 02:04 PM
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Joined: Jan 2003
Posts: 16,941
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,941
NC
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Quote:
I opted for 1.5 MM compression rings,both 1st and 2nd and 3.0 MM oil rings This is the first time I'm going to be using these smaller rings, I hope there is some power as well as and good sealing with them
IMO, the 1.5mm isn't that small. 1.5/25.4=0.0591" which is close to the typical 1/16"=0.0625. Small to me would be the 0.043" rings.
The oil ring is smaller than the typical 3/16"=0.1875", 3.00/25.4=0.1181"
Quote:
The piston information sheet shows the compression hieght as 1.150
OK. I run the shorter rod, 6.535 long and use 1.300-1.320" CH pistons. These leave room for the rings.
Out of curiousity, how far is the top ring from the top of the piston (not the dome)?
And how long is the skirt from the top of the piston?
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Re: Stroker pistons, AKA "hockey pucks"
[Re: 440Jim]
#1009818
06/10/11 02:15 PM
06/10/11 02:15 PM
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Joined: Jan 2003
Posts: 2,936
Finalnd, Perkele
jyrki
master
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master
Joined: Jan 2003
Posts: 2,936
Finalnd, Perkele
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Off the shelf Mahle pistons have 1.5/1.5/3mm rings, no problem. Donät remeber the weight, bit they were in thh "eagle 4.5" stroker kit" for a 440. I remeper hte pistons were under 600 grams each, shich in my opinion was great for an off ahlef piston. Coated too. Personally I don't like the oil ring in the pin hole, have had problems with that once, nut that was in a street engine. Something got to the ring roove and locked the oil ring.
Plynouth VIP '67 TT IC EFI
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Re: Stroker pistons, AKA "hockey pucks"
[Re: Cab_Burge]
#1009819
06/10/11 03:49 PM
06/10/11 03:49 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Quote:
how much hp are expecting out of this one Cab?
At least 400 It depends on which heads, intake, carb and the dyno More than anyone in Florida can make with the same parts
thats what I am talking about. you are the man Cab  good luck with the build . the pistons look nice. I will be ordering a light weight set soon.
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Re: Stroker pistons, AKA "hockey pucks"
[Re: 440Jim]
#1009820
06/10/11 04:19 PM
06/10/11 04:19 PM
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Joined: Aug 2003
Posts: 43,902
Bend,OR USA
Cab_Burge
OP
I Win
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OP
I Win
Joined: Aug 2003
Posts: 43,902
Bend,OR USA
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Quote:
Quote:
Out of curiousity, how far is the top ring from the top of the piston (not the dome)?And how long is the skirt from the top of the piston?
I was going to measure and post the length of the skirts and forgot to  The pistons and rods are in the block now, sorry I would guess around 2.500 skirt length from the deck to the bottom based on measuring one of my old ross pistons for my pump gas 512 motor, they measure 2.550, they also have a 22 cc dish, the rings on them are .190 from the deck to the top of the top ringland, which has a 1/16 top and 2nd ring.The Ross pistons weighed 556 grams without pins, rings and oil ring spacer, the Diamonds weigh 521 grams bare with the dome  The Diamond wrist pins are thicker, longer and heavier than the Ross wrist pins, the Ross pins are tapered and the Diamonds are not :shruggy Next time I will step up to a tool steel lightweight race wrist pins IHTHs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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