Question on piston dome volume
Thread Starter
Melting Slicks
Joined: Feb 1999
Posts: 3,078
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Question on piston dome volume
Does anyone know how to read the advertised dome on pistons and convert that to cc's?
I have TRW forged 435 horse 427 pistons which are advertised with a 0.255" dome. Every calculator wants cc's. When they advertise a dome, they couldn't mean "0.255 cubic inch dome volume". I can believe it's 0.255 linear inches tall, but that provides no information about dome volume.
It's supposed to work out to 11:1 compression on 109 cc heads, standard Chevy BB deck height, and standard Felpro head gasket, on a 0.030" overbore according to the machinist. But I'd really like to check his math.
Thanks.
I have TRW forged 435 horse 427 pistons which are advertised with a 0.255" dome. Every calculator wants cc's. When they advertise a dome, they couldn't mean "0.255 cubic inch dome volume". I can believe it's 0.255 linear inches tall, but that provides no information about dome volume.
It's supposed to work out to 11:1 compression on 109 cc heads, standard Chevy BB deck height, and standard Felpro head gasket, on a 0.030" overbore according to the machinist. But I'd really like to check his math.
Thanks.
Drifting
Joined: Dec 1999
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From: Reno nevada
Re: Question on piston dome volume (MoMo)
I have a speed-Pro forged piston cat. It lists: 427 closed chamber stock type .300 dome/pressed pin Same as L72, L71 435/425 hp and L89 435 hp 11.25 C/R w/106.9 cc chamber
So yours with a little less dome and more than 106.9 cc would be right at 11.
So yours with a little less dome and more than 106.9 cc would be right at 11.
Safety Car
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From: Roxbury NJ
Re: Question on piston dome volume (MoMo)
No way you'll figure cc from that .255" height figure. You'll have to find the actual cc info somewhere, or cc them yourself. Unfortunately, the only way I know to cc the dome is to first install them in the engine, then set the piston a measured distance down from the deck, then fill it. Maybe there's another way I've never seen? I'm assuming you don't have the block and pistons handy.
[Modified by Flareside, 2:45 PM 1/30/2002]
[Modified by Flareside, 2:45 PM 1/30/2002]
Team Owner
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Re: Question on piston dome volume (Flareside)
Just like measuring the volume of any irregular shaped object. You place it in water and read off the added graduation lines. So if you could find a big enough cc graduated beaker and only imersed the dome it would tell you the number of cc's
Le Mans Master
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From: delmont pa
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Re: Question on piston dome volume (MoMo)
the volume is std bore 36.3cc, +.030= 35.5cc, + .060= 34.2 cc :chevy any thing else?
[Modified by clem zahrobsky, 1:29 AM 1/31/2002]
[Modified by clem zahrobsky, 1:29 AM 1/31/2002]
Drifting
Joined: Aug 2000
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From: Annapolis MD
Re: Question on piston dome volume (MoMo)
Go to (when it's up ) http://www.nhra.com/tech_specs/engin...ts/CHEV-67.rtf It lists the 435/427 as 36.34 cc dome, 0.35 height
-Greg
-Greg
Safety Car
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From: Roxbury NJ
Re: Question on piston dome volume (gkull)
Just like measuring the volume of any irregular shaped object. You place it in water and read off the added graduation lines. So if you could find a big enough cc graduated beaker and only imersed the dome it would tell you the number of cc's
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Re: Question on piston dome volume (MoMo)
You can duplicate the old head CCing technique with a piece of plasticine modeling clay (the oily stuff.)
Make a frame out of wood lath (paint stirring sticks work pretty good, press the clay in the frame and scree it off perfectly flat with a metal straight edge. Wet the top of the piston and press the dome of the piston into the clay(water will keep the piston from sticking) until the top edge of the piston is level with the top of the clay.
Take a 100 m/l graduated cylinder, fill it too the 100 m/l. use a flat piece of lucite plastic with a hole in it. Lay it on top of your imprint of the piston dome in the clay. Pour the water into the hole until it is completely full.
Look at the amount of water in the cylinder, the amount that you poured out is how much volume the dome displaces in CC's. 1 ML = 1CC.
Make a frame out of wood lath (paint stirring sticks work pretty good, press the clay in the frame and scree it off perfectly flat with a metal straight edge. Wet the top of the piston and press the dome of the piston into the clay(water will keep the piston from sticking) until the top edge of the piston is level with the top of the clay.
Take a 100 m/l graduated cylinder, fill it too the 100 m/l. use a flat piece of lucite plastic with a hole in it. Lay it on top of your imprint of the piston dome in the clay. Pour the water into the hole until it is completely full.
Look at the amount of water in the cylinder, the amount that you poured out is how much volume the dome displaces in CC's. 1 ML = 1CC.
Safety Car
Joined: Dec 1999
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From: Roxbury NJ
Re: Question on piston dome volume (Smokehouse69)
Ok, anybody know a convenient source for a graduated cylinder? Pharmacy? I just got my new SRP pistons today!
-Joe
[Modified by Flareside, 2:31 PM 1/31/2002]
-Joe
[Modified by Flareside, 2:31 PM 1/31/2002]
Race Director
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From: The Top of Utah
Re: Question on piston dome volume (clem zahrobsky)
the volume is std bore 36.3cc, +.030= 35.5cc, + .060= 34.2 cc :chevy any thing else?
There are several good suggestions for measuring the dome volume, here. The height of the dome in the catalog is merely a discription. If the dome volume isn't listed in the back of the book, under "specs", call the manufacturer. They will tell you.
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Re: Question on piston dome volume (Flareside)
Go to any place that sells horse/cow stuff. Now Now.... I meant supplies, not the other!
Feed stores, saddle tach stores etc all have cheap syringes that work great. They are available in many sizes from 25cc to Oh my God size.
Jim
Feed stores, saddle tach stores etc all have cheap syringes that work great. They are available in many sizes from 25cc to Oh my God size.
Jim
Safety Car
Joined: Dec 1999
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From: Roxbury NJ
Re: Question on piston dome volume (427Hotrod)
Go to any place that sells horse/cow stuff. Now Now.... I meant supplies, not the other!
Feed stores, saddle tach stores etc all have cheap syringes that work great. They are available in many sizes from 25cc to Oh my God size.
Jim
Feed stores, saddle tach stores etc all have cheap syringes that work great. They are available in many sizes from 25cc to Oh my God size.
Jim
[Modified by Flareside, 9:45 PM 1/31/2002]
Drifting
Joined: Jul 2001
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Re: Question on piston dome volume (Flareside)
Quote:
"Ok, anybody know a convenient source for a graduated cylinder? Pharmacy? I just got my new SRP pistons today!
-Joe"
Will you mail a pic of those shiney new SRP's?
"Ok, anybody know a convenient source for a graduated cylinder? Pharmacy? I just got my new SRP pistons today!
-Joe"
Will you mail a pic of those shiney new SRP's?
Safety Car
Joined: Dec 1999
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From: Roxbury NJ
Re: Question on piston dome volume (mountainmotor)
Quote:
"Ok, anybody know a convenient source for a graduated cylinder? Pharmacy? I just got my new SRP pistons today!
-Joe"
Will you mail a pic of those shiney new SRP's?
"Ok, anybody know a convenient source for a graduated cylinder? Pharmacy? I just got my new SRP pistons today!
-Joe"
Will you mail a pic of those shiney new SRP's?
-Joe
Team Owner
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Question on piston dome volume (MoMo)
To all of you engine builders put those pistons back in the boxes and send them out to get them thermally coated. Then you won't have to worry about using pump gas and higher compression.
