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Old 05-22-2007, 10:28 PM
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hi @ how many cc's ya think this dish is?

pontiac 400 piston 030 over. 8 valve reliefs

/IMG/www.hotrodders.com/gallery/data/500/medium/pontiac_400_8_piston.jpg/IMG/

OH CRAP, wha'd i do wrong now? ok, well FYI, this is NOT how to post a pic

let's try this: THANKS CBOY btw! just needed a refresher course.

[img]address of pic here, and[/img] and presto:


Last edited by bullheimer; 05-22-2007 at 10:44 PM.
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Old 05-23-2007, 04:46 AM
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piece of clear plastic sheet roughly 5"x5"....drill a 1/4" hole in the middle....
some rubbing alcohol.....
a 10cc or so syringe from a diabetic buddy...
some bearing grease or Vaseline to "paste" and seal the plastic to the piston top....
draw 10cc of alcohol into the syringe.....
fill the covered piston top with alcohol till there are no air pockets/bubbles

10cc-whats left=dish volume
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Old 05-23-2007, 04:57 AM
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piston

My guess would be 18 to 20 cc's.....but you really need to check it...

Keith
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Old 05-24-2007, 12:12 AM
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any guesses as to how much this shape would kill flame propogation?
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Old 05-24-2007, 06:58 AM
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bullheimer,
your question is way way way to general.......

no one can even "guess" about flame propagation issues without full details of the motor and cylinder head design and layout....chamber shape and plug location and valve angles and compression and every other detail of the motor.....

what are you trying to accomplish?
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Old 05-24-2007, 10:56 AM
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pistons

Man,,, They look like a detonation party waiting for a place to happen to me.....

If you are running a 8.5:1 engine in a light car,,probably no issuse.

If you are going to run it at 10.2:1 in a 4000 lbs car on 87 octane,,,, then you better get ready for a aluminum sacrifice....


Keith
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Old 05-24-2007, 03:14 PM
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okay, with my 72cc heads looking about 9.5 to one in a 3600lb stripped 66 tempest w/400 engine, tranny th350, geared to engine. open chamber heads i believe:

not much quench area
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Old 05-24-2007, 06:02 PM
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With a 4.121" bore and 3.750" stroke, the cylinder is 820 cc's
Chambers 72 cc's
Piston 18 cc's (I agree with Keith)
Gasket 9 cc's
Piston deck height about 8 cc's @ 0.035" below deck.

Total intake 927 cc's divided by compressed 107 cc's equals 8.66:1 static c.r.

I would suppress any ambitions to build it any higher c.r. with the heads you have. Just my opinion.
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Old 05-25-2007, 04:43 AM
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bullheimer,
those pistons are stock FM (pic attached) (or maybe Badger) cast rebuilder pistons for a 400....

they sit .050 in the hole and the valve reliefs total 20-23cc according to this source who measured them:

http://forums.performanceyears.com/f...=390838&page=2

so static CR should end up between 8.0-8.5 depending on the cam

that can be a really nice cruiser motor....the 400 cubes makes 2 tons plus of torque for "push you back in the seat" acceleration....(while burning 87 octane with lots of timing for mpg)

there are hyperutectic flat tops available, approx 6cc reliefs (KB example attached)....roughly $260/set
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Last edited by red65mustang; 05-25-2007 at 04:59 AM.
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Old 05-26-2007, 11:00 AM
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Quote:
Originally Posted by red65mustang
piece of clear plastic sheet roughly 5"x5"....drill a 1/4" hole in the middle....
some rubbing alcohol.....
a 10cc or so syringe from a diabetic buddy...
some bearing grease or Vaseline to "paste" and seal the plastic to the piston top....
draw 10cc of alcohol into the syringe.....
fill the covered piston top with alcohol till there are no air pockets/bubbles

10cc-whats left=dish volume
A old common CD-Rom Disc does a good back yard imitation of a "clear plastic sheet roughly 5"x5"....drill a 1/4" hole in the middle".

Water works fine. you can buy a 100ML glass gaduated cylinder from most good local pharmacys. ($15 to $25)
A 1cc insulin needle (with the needle tip removed for saftey) works good for adding the last few drops.
Use the Vaseline around the valve edge/valve seats when doing the heads.
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