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Old 01-10-2013, 04:44 PM
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standard dish vs d dish

For a hot street application, is there much of a difference in a standard dish piston or a reverse dome ( d dish style) piston?

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Old 01-10-2013, 04:56 PM
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Quote:
Originally Posted by 377MONTE View Post
For a hot street application, is there much of a difference in a standard dish piston or a reverse dome ( d dish style) piston?
Reverse dome that matches your heads is best for some appliations.

What is the goal. Is it a blower motor.
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Old 01-10-2013, 05:09 PM
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n/a motor.. for now. maybe throw some nitrous at it later down the road. 383 sbc 10:1. dart iron eagle 200s, 64 cc. am i leaving a lot on the table if i opt for the cheaper standard dish?
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Old 01-10-2013, 05:14 PM
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goal is just a hot street motor. ill drive it around town but take it to the strip from time to time
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Old 01-10-2013, 05:18 PM
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What I try to recommend is a piston that has a sufficient amount of flat area on the crown that it will be able to "squish" the mixture (that would normally be in between the piston crown and the underside of the cylinder head), across the chamber, creating turbulence and homogenizing the air fuel mixture in the chamber to help insure complete combustion of the mix. Building a tight squish (0.035" to 0.045" on a SBC) will also help to prevent detonation and may allow the motor to operate on a lesser grade of fuel than if you didn't have a tight squish.

If a fellow has to use a dish at all to reach the intended static compression ratio on his build, I prefer the "D" shape of the Keith Black pistons. They have a generous flat area on the crown to generate the proper squish at close to TDC. Pistons that have circular dishes generally don't have enough flat area on the piston crown to cause the mixture to "squish" across the chamber.
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Old 01-10-2013, 05:20 PM
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Quote:
Originally Posted by 377MONTE View Post
n/a motor.. for now. maybe throw some nitrous at it later down the road. 383 sbc 10:1. dart iron eagle 200s, 64 cc. am i leaving a lot on the table if i opt for the cheaper standard dish?

Is it zero deck cause you can buy flat tops that sit a little further down in the hole.

But yes a reverse dome is best because you can run a good quench area under the pad. But dish can be used. I think flat tops would be the other option not dish. But not sure of your numbers so can really figure it out.

Fyi rebuilder pistons with 64cc heads will come damn close to your goal. But for nos you will want forged.
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Old 01-10-2013, 05:29 PM
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I would back down a little with iron heads, closer to 9.5:1. Here's a forged piston from KB that will produce a 9.6:1 SCR with 64cc heads.
http://www.kb-silvolite.com/icon/ico...etails&P_id=21
Notice the compression height on these pistons is 1.433", 0.008" taller than most 383 pistons that measure 1.425". This additional compression height will get the piston crown closer to the block deck at TDC and should make it easier to adjust your SCR and squish.
Choose a cam that closes the intake at ~35 degrees ABDC @0.050" tappet lift for a dynamic compression ratio of 8.49:1 that will operate on pump gas.pisto
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Old 01-11-2013, 04:22 AM
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There is a line of Sealed Power pistons w/a smaller diameter, deeper round dish that have a wider squish band that might be a better option than the traditional shallow round dish pistons- especially the ultra weak shallow dish w/45 degree chamfer around the circumference. Both are shown here.

I've not had the time to research this line of pistons fully for application and specs, but I do know the piston shown (H423NP w/10cc dish) has a 1.54" compression height. I'm hoping they also have this dish type in 1.56" CH, and for a 383 SBC stroker, too.

If anyone happens to have this info I'd appreciate a link or the info can be simply added to the wiki (link above).

Thanks, Mark
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