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drilling holes in piston #1246348
06/06/12 05:42 PM
06/06/12 05:42 PM
Joined: Mar 2003
Posts: 710
Harrisburg Pa. 17112
M
moparmikethree Offline OP
super stock
moparmikethree  Offline OP
super stock
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Joined: Mar 2003
Posts: 710
Harrisburg Pa. 17112
when drilling holes in the top of the pistons at the top ring.(compression pushes the ring out for better sealing) What size drill bit, and do you drill down to the second ring also

Re: drilling holes in piston [Re: moparmikethree] #1246349
06/06/12 05:58 PM
06/06/12 05:58 PM
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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BradH Offline
Taking time off to work on my car
BradH  Offline
Taking time off to work on my car
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
My is to do a Google search on "gas porting pistons" and spend some time looking at the articles & tool links that come up.

Re: drilling holes in piston [Re: BradH] #1246350
06/06/12 07:34 PM
06/06/12 07:34 PM
Joined: Aug 2003
Posts: 12,291
Kent, Wa
340SHORTY Offline
Truck Nut
340SHORTY  Offline
Truck Nut

Joined: Aug 2003
Posts: 12,291
Kent, Wa
Is that procedure even done anymore? I remember it from years ago but nothing in the last few years..


I am truckless..
Re: drilling holes in piston [Re: 340SHORTY] #1246351
06/06/12 07:41 PM
06/06/12 07:41 PM
Joined: Feb 2010
Posts: 2,806
Northern NJ
StukaJU87 Offline
master
StukaJU87  Offline
master

Joined: Feb 2010
Posts: 2,806
Northern NJ
I bought my 440 from a member here and the pic of the block with the heads off shows a hole in the center of each piston.


Scott

1969 Super Bee, 383/4 speed


Re: drilling holes in piston [Re: StukaJU87] #1246352
06/06/12 07:45 PM
06/06/12 07:45 PM
Joined: Feb 2010
Posts: 2,806
Northern NJ
StukaJU87 Offline
master
StukaJU87  Offline
master

Joined: Feb 2010
Posts: 2,806
Northern NJ

7239292-4402pistons.JPG (55 downloads)

Scott

1969 Super Bee, 383/4 speed


Re: drilling holes in piston [Re: StukaJU87] #1246353
06/06/12 08:14 PM
06/06/12 08:14 PM
Joined: Jan 2003
Posts: 19,558
Park Forest, IL
slantzilla Offline
I Live Here
Happy Birthday slantzilla  Offline
I Live Here

Joined: Jan 2003
Posts: 19,558
Park Forest, IL
Quote:

I bought my 440 from a member here and the pic of the block with the heads off shows a hole in the center of each piston.




That is a machining dimple from centering the piston. I would hope it does not go all the way through.

To the OP, if you don't know what you're doing, gas porting is a very quick way to ruin a good set of pistons. Google will be your friend for sure.


"Everybody funny, now you funny too."
Re: drilling holes in piston [Re: slantzilla] #1246354
06/06/12 11:30 PM
06/06/12 11:30 PM
Joined: Jan 2003
Posts: 73,814
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 73,814
U.S.S.A.
Quote:

Quote:

I bought my 440 from a member here and the pic of the block with the heads off shows a hole in the center of each piston.




That is a machining dimple from centering the piston. I would hope it does not go all the way through.

To the OP, if you don't know what you're doing, gas porting is a very quick way to ruin a good set of pistons. Google will be your friend for sure.




what he said

Re: drilling holes in piston [Re: moparmikethree] #1246355
06/07/12 12:27 AM
06/07/12 12:27 AM
Joined: Aug 2003
Posts: 39,049
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
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Joined: Aug 2003
Posts: 39,049
Bend,OR USA
All gas porting, vertical or horizontal, should be done by a competent Hi Po shop or a piston company with the proper equiptment, not a piston vice and drill motor


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: drilling holes in piston [Re: Cab_Burge] #1246356
06/07/12 03:38 PM
06/07/12 03:38 PM
Joined: Jan 2004
Posts: 283
Toronto, ON
ehbody Offline
enthusiast
ehbody  Offline
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Joined: Jan 2004
Posts: 283
Toronto, ON
Stupid question.
But what does "gas porting pistons" do?


Shawn 70 AAR
Re: drilling holes in piston [Re: moparmikethree] #1246357
06/07/12 03:54 PM
06/07/12 03:54 PM
Joined: Feb 2012
Posts: 4,332
Morristown Tn.
7
71birdJ68 Offline
master
71birdJ68  Offline
master
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Joined: Feb 2012
Posts: 4,332
Morristown Tn.
I gas ported a set of motorcycle pistons years ago, but they tell me that the way rings are made today it's not needed. Talk to a motor expert.

Re: drilling holes in piston [Re: ehbody] #1246358
06/07/12 03:57 PM
06/07/12 03:57 PM
Joined: Jan 2003
Posts: 73,814
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 73,814
U.S.S.A.
Quote:

Stupid question.
But what does "gas porting pistons" do?




It puts compression pressure behind the ring forcing it against the piston and the bore for a better ring seal. I have a set of JE pistons that had it done. Only negative thing is once the holes get filled with carbon it's the same as a piston with no holes drilled.







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