Re: Valve relief pockets as gas ports???
[Re: 540dust]
#189578
01/11/09 11:16 PM
01/11/09 11:16 PM
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Joined: Mar 2006
Posts: 9,910 Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
I know a guy that welded the notches before too, but the hole was thru the bottom not to the ring groove.
The ring groove can be re-dressed ![](/ubbthreads/images/graemlins/thumbs.gif)
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Re: Valve relief pockets as gas ports???
[Re: B G Racing]
#189579
01/11/09 11:28 PM
01/11/09 11:28 PM
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Joined: Jan 2005
Posts: 3,635 Oakland, MI
dizuster
master
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master
Joined: Jan 2005
Posts: 3,635
Oakland, MI
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Quote:
Quote:
I know a guy that welded the notches before too, but the hole was thru the bottom not to the ring groove.
The ring groove can be re-dressed
Really? I called Diamond getting ring grooves re-cut and they told me no way....
I'd be worried about warping the ring land groove. Most good pistons today are so tight to start with, it wouldn't take much...
I'd be getting a new set from whoever screwed them up when they cut them.
I mean come on, cutting a hole in 1 is a mistake, cutting all 8 is a joke...
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Re: Valve relief pockets as gas ports???
[Re: 1976 Aspen]
#189581
01/12/09 12:09 AM
01/12/09 12:09 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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i wouldn't run them. adding radial clearance is one thing, but milling .065 deeper should give you enough room for an .800 lift cam. they look a lot deeper than that. i know it's not what you want to hear but, i think you have 8 new paperweights.
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Re: Valve relief pockets as gas ports???
[Re: B G Racing]
#189583
01/12/09 09:12 AM
01/12/09 09:12 AM
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Joined: Jan 2005
Posts: 3,635 Oakland, MI
dizuster
master
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master
Joined: Jan 2005
Posts: 3,635
Oakland, MI
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Quote:
What's so hard about cutting ring lands?We have re-cut them to go to a thicker ring and have also relocated the ring lands.
That is exactly what Diamond said they would not do. I called them because I was thinking about buying a set of pistons a guy had, but they were metric rings, and I wanted standard 1/16" stuff. I told Diamond I already had the pistons and I wanted to send them back to get the rings re-cut. They said they absolutely would not do that?
Should have bought them and sent them to you!
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Re: Valve relief pockets as gas ports???
[Re: dizuster]
#189584
01/12/09 09:39 AM
01/12/09 09:39 AM
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Joined: Mar 2006
Posts: 9,910 Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
Quote:
What's so hard about cutting ring lands?We have re-cut them to go to a thicker ring and have also relocated the ring lands.
That is exactly what Diamond said they would not do. I called them because I was thinking about buying a set of pistons a guy had, but they were metric rings, and I wanted standard 1/16" stuff. I told Diamond I already had the pistons and I wanted to send them back to get the rings re-cut. They said they absolutely would not do that?
Should have bought them and sent them to you!
Some pistons are not concentric enough to chuck up with out the centering plug left on the top of the piston,once the piston has been machined the stub is knocked off and the top is finished.To re-chuck it can be a pita on some but with a little effort anything can be done. ![](/ubbthreads/images/graemlins/thumbs.gif)
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Re: Valve relief pockets as gas ports???
[Re: 1976 Aspen]
#189586
01/12/09 09:00 PM
01/12/09 09:00 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
I Live Here
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I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Sorry, I would have a serious problem with those slug's,,,,I just hope I am never in the other lane against you. ![](/ubbthreads/images/graemlins/nervous.gif)
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Valve relief pockets as gas ports???
[Re: 1976 Aspen]
#189587
01/12/09 09:11 PM
01/12/09 09:11 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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here's a silly question. it's clearly obvious that one of the holes connects with the ring land. where does the other one go??? it's too far inward to connect to the ring land. it looks like it would just go through the top and come out the bottom of the piston near the pin. in any case i do find it interesting that even with all the people telling you all the bad things that can happen, your still willing to chance trashing a motor.
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Re: Valve relief pockets as gas ports???
[Re: dthemi]
#189589
01/12/09 09:56 PM
01/12/09 09:56 PM
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Joined: Sep 2007
Posts: 238 Roseau, MN
1976 Aspen
OP
enthusiast
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OP
enthusiast
Joined: Sep 2007
Posts: 238
Roseau, MN
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Dartman- It's not like my motor is going to saw itself in half going down the track ![](/ubbthreads/images/graemlins/hammer.gif) DRAM- There is only one little hole. I have .187 in the thinnest spot to make an actual hole in the top of the piston. And no offense to you or anybody else, I've learned to take most information, advice, and opinions with a grain of salt on this board. dthemi- I can understand where you're coming from. I'll keep everybody posted when, or if, it decides to break.
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Re: Valve relief pockets as gas ports???
[Re: 1976 Aspen]
#189590
01/12/09 10:12 PM
01/12/09 10:12 PM
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Anonymous
Unregistered
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Anonymous
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maybe i'm just seeing a reflection or something. it looks like 3 different holes. ![](/ubbthreads/images/graemlins/shruggy.gif)
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Re: Valve relief pockets as gas ports???
[Re: 1976 Aspen]
#189592
01/12/09 10:22 PM
01/12/09 10:22 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
DRAM, you're seeing a reflection. The only hole is on the intake relief furthest to the left. The others are just camera glare. Whatcha think about it now???
what's the depth of the valve pocket and were they shelf stock CP pistons you started with?
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Re: Valve relief pockets as gas ports???
[Re: 1976 Aspen]
#189594
01/12/09 10:29 PM
01/12/09 10:29 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
The pocket depth from the top of the piston to the deepest part of the pocket???
yes, and if you know, how deep were they before they were cut?
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Re: Valve relief pockets as gas ports???
[Re: 1976 Aspen]
#189596
01/13/09 12:43 AM
01/13/09 12:43 AM
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Anonymous
Unregistered
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Anonymous
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i'm not 100% positive but i think their std. smallblock valve reliefs are something like .230 intake and .190 exhaust. being a custom set they might have been deeper than that already. to answer your other question, no, i still wouldn't run them. that's a very large hole. eventually the ring gap will line up with that hole and may actually get stuck there due to the pressure escaping. it's not anything like a normal gas port. good luck with them, i hope it doesn't cost you a motor down the road. no doubt it'll run, for how long is the question.
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