Author Topic: 46 oppy big bore pistons  (Read 5981 times)

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Offline flatlanderfornow

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46 oppy big bore pistons
« on: November 28, 2016, 05:03:54 pm »
I need some for a puller, must use stock Briggs
pistons up to .030 over. Listed as no longer available
from Briggs. Funny you can still buy the block.
Todd Potter
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Offline BIG AL 202

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Re: 46 oppy big bore pistons
« Reply #1 on: November 28, 2016, 05:33:51 pm »
THE BIG BORE PISTONS USE PISTONS FROM THE 31ci SINGLES. THAT IS IF YOU DO HAVE A BIG BORE BLOCK. WHAT IS THE BORE SIZE?
ALWAYS VOTE FOR ED!   FONGS BROTHER FROM ANOTHER MOTHER!

Offline flatlanderfornow

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Re: 46 oppy big bore pistons
« Reply #2 on: November 29, 2016, 12:40:24 pm »
3.537 or something like that it is the big bore
463707
Todd Potter
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Offline PJG56

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Re: 46 oppy big bore pistons
« Reply #3 on: November 29, 2016, 01:03:36 pm »
3.537 or something like that it is the big bore
463707

Standard bore size=3.5625
Paul Guptill  (oppy) #238modX
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Offline BIG AL 202

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Re: 46 oppy big bore pistons
« Reply #4 on: November 30, 2016, 10:31:59 am »
THAT'S NOT A BIG BORE BLOCK. IT WILL NEED BORED AND SLEEVED TO BE A BIG BORE. THE BIG BORE IS 3.6 SOMETHING (I don't remember exactly)
ALWAYS VOTE FOR ED!   FONGS BROTHER FROM ANOTHER MOTHER!

Offline flatlanderfornow

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Re: 46 oppy big bore pistons
« Reply #5 on: November 30, 2016, 02:00:08 pm »
What Paul said
3 9/16 bore 31 cube pistons are the same size but appear to be dished
Seems to me that would take the 7:1 compression and make it 
4:1 or something
Todd Potter
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Offline Jeff McKelroy

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Re: 46 oppy big bore pistons
« Reply #6 on: November 30, 2016, 02:32:12 pm »
"3 9/16 bore 31 cube pistons are the same size but appear to be dished"

You are looking at an early 31 piston that was used with the .050" shorter rod for the single cylinder engines. Ignore those pistons. Use P/N 796172 for standard bore with ARC Rods.

Offline flatlanderfornow

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Re: 46 oppy big bore pistons
« Reply #7 on: November 30, 2016, 05:47:54 pm »
thanks
Todd Potter
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Offline PJG56

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Re: 46 oppy big bore pistons
« Reply #8 on: November 30, 2016, 09:45:03 pm »
"3 9/16 bore 31 cube pistons are the same size but appear to be dished"

You are looking at an early 31 piston that was used with the .050" shorter rod for the single cylinder engines. Ignore those pistons. Use P/N 796172 for standard bore with ARC Rods.

Jeff Flatlander is looking for stock oppy pistons
Paul Guptill  (oppy) #238modX
2012 slmra mowstock champion(builder/owner)

2013 slmra mowdified champion(builder/owner)
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2014 ARMA national champion Mod-X(builder/owner)
2014 All American Champion Mod-X/CP(builder/owner)
2014All American Champion FXT (engine builder)
2014 All American 2nd place SP(builder/owner)
2015 All American 2nd place BP (builder/owner)
2016 OutlawTriple Crown FXT Champion (engine builder)

Offline Jeff McKelroy

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Re: 46 oppy big bore pistons
« Reply #9 on: December 01, 2016, 10:48:17 am »
Gotcha.

Offline BIG AL 202

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Re: 46 oppy big bore pistons
« Reply #10 on: December 01, 2016, 04:08:46 pm »
OK MY BAD, STOCK IS 3.4 AND 3.5 IS 31ci. 3.6 IS 33ci. I HAVE YET TO HEAR OF A 3.6 BORE OPPY. I WAS TOLD IT WON'T GO THAT FAR, BUT I DON'T KNOW IF THE BIG BLOCK WILL GO THAT FAR.
JEFF YOU HAVE THAT BIG BLOCK I HAD, WILL IT GO THAT FAR?
ALWAYS VOTE FOR ED!   FONGS BROTHER FROM ANOTHER MOTHER!

Offline Jeff McKelroy

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Re: 46 oppy big bore pistons
« Reply #11 on: December 01, 2016, 07:50:42 pm »
OK MY BAD, STOCK IS 3.4 AND 3.5 IS 31ci. 3.6 IS 33ci. I HAVE YET TO HEAR OF A 3.6 BORE OPPY. I WAS TOLD IT WON'T GO THAT FAR, BUT I DON'T KNOW IF THE BIG BLOCK WILL GO THAT FAR.
JEFF YOU HAVE THAT BIG BLOCK I HAD, WILL IT GO THAT FAR?


Yes, the big block will. However, let's observe the SP engines to see what happens when it's not done with PRECISION.

3.57 = 31, 3.71 = 33.

 

anything