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New piston question??? #608284
02/08/10 09:52 PM
02/08/10 09:52 PM
Joined: Aug 2009
Posts: 2,036
Mooresburg, Tn
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'72CudaRacer Offline OP
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'72CudaRacer  Offline OP
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Joined: Aug 2009
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Mooresburg, Tn
I have a new set of Ross dome pistons .030 440.
They have a "ridge" between the valve reliefs. I hope you cansee it in this picture.
Q: Do I need to remove this ridge? What about the other "sharp" edges on the dome and around the plug relief? Should they be masseged or run as is?
I just realized that in 20 some years of racing, this is the FIRST set of NEW pistons that I'VE ever had! Always bought someone else's hand-me-downs.

5792154-Pistons010.JPG (88 downloads)
Re: New piston question??? [Re: '72CudaRacer] #608285
02/08/10 09:54 PM
02/08/10 09:54 PM
Joined: Aug 2009
Posts: 2,036
Mooresburg, Tn
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'72CudaRacer Offline OP
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Mooresburg, Tn
Another angle

5792163-Pistons012.JPG (80 downloads)
Re: New piston question??? [Re: '72CudaRacer] #608286
02/08/10 09:58 PM
02/08/10 09:58 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
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Posts: 43,007
Bend,OR USA
Quote:

I have a new set of Ross dome pistons .030 440.
They have a "ridge" between the valve reliefs. I hope you cansee it in this picture.
Q: Do I need to remove this ridge? What about the other "sharp" edges on the dome and around the plug relief? Should they be masseged or run as is?
I just realized that in 20 some years of racing, this is the FIRST set of NEW pistons that I'VE ever had! Always bought someone else's hand-me-downs.


I try not to run any sharp angles in the comustion chamber, take the sharp edge off with a small knife, don't take a bunch off, just round the edge off so it won't cut you or feel sharp


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: New piston question??? [Re: '72CudaRacer] #608287
02/08/10 10:10 PM
02/08/10 10:10 PM
Joined: Oct 2006
Posts: 527
alaska,usa
9
9secondsatellite Offline
mopar
9secondsatellite  Offline
mopar
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Posts: 527
alaska,usa
they haven't been balanced yet i take it. are you going to coat them? i would round out the edges but nothing radical. don't need to remove the ridge but just smooth it with some very fine stuff.

Re: New piston question??? [Re: Cab_Burge] #608288
02/08/10 10:14 PM
02/08/10 10:14 PM
Joined: Aug 2009
Posts: 2,036
Mooresburg, Tn
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'72CudaRacer Offline OP
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'72CudaRacer  Offline OP
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Mooresburg, Tn



I try not to run any sharp angles in the comustion chamber, take the sharp edge off with a small knife, don't take a bunch off, just round the edge off so it won't cut you or feel sharp



I was thinking That I'd use very fine sand paper to just "knock off" the edge. Any thoughts about that?

Re: New piston question??? [Re: 9secondsatellite] #608289
02/08/10 10:17 PM
02/08/10 10:17 PM
Joined: Aug 2009
Posts: 2,036
Mooresburg, Tn
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'72CudaRacer Offline OP
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Mooresburg, Tn
Quote:

they haven't been balanced yet i take it. are you going to coat them? i would round out the edges but nothing radical. don't need to remove the ridge but just smooth it with some very fine stuff.



No, not balanced yet. Planing to do that sat. Coat them with what?

Re: New piston question??? [Re: '72CudaRacer] #608290
02/08/10 10:30 PM
02/08/10 10:30 PM
Joined: Oct 2006
Posts: 527
alaska,usa
9
9secondsatellite Offline
mopar
9secondsatellite  Offline
mopar
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Joined: Oct 2006
Posts: 527
alaska,usa
heat barrier coating is what i was refering to. probably not necessary.

Re: New piston question??? [Re: 9secondsatellite] #608291
02/08/10 10:32 PM
02/08/10 10:32 PM
Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer Offline
master
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Rock Springs

Yep
Nock the sharp edges down how ever you can.


[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
Re: New piston question??? [Re: Bob_Coomer] #608292
02/08/10 10:42 PM
02/08/10 10:42 PM
Joined: Aug 2009
Posts: 2,036
Mooresburg, Tn
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'72CudaRacer Offline OP
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Mooresburg, Tn
Thats what I was thinking, but wanted to make sure. What about the edges of the piston crown. (if it was a flat top, the top edge)? Leave it alone, or smooth it also?
Thanks guys, Brian

Re: New piston question??? [Re: 9secondsatellite] #608293
02/08/10 11:52 PM
02/08/10 11:52 PM
Joined: May 2004
Posts: 1,031
South Jersey
kruger Offline
Yours Too!
kruger  Offline
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Posts: 1,031
South Jersey
Quote:

i would round out the edges but nothing radical. don't need to remove the ridge but just smooth it with some very fine stuff.





I have those same pistons.Just take a dremmel with a fine roll and just radius the sharp edges around the dome.Then polish them up.

As stated above,nothing radical.Just imagine making a sharp right turn at a lite.

5792424-RossDome.jpg (51 downloads)






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