Difference in piston heads..?

joshfrisco · September 17th, 2009, 01:14 AM

.

anyone know what the difference between Dished and Flat Top pistons?

.

silverstang · September 17th, 2009, 02:09 AM

they are exactly what they sound like. A dish piston actually has a small dish to it. A "flat top" piston actually is just that, a flat top on it. It is all used for compression ratios mostly. The deeper the dish, the less the compression. Flat tops will yield a higher compression ratio. Stock pistons IIRC are 6.5cc dish, which produces a 9.8.1 compression ratio with our cylinder heads. If you are building a supercharged/turbo motor, you want a lower compression than a naturally aspirated motor.

There are OTHER things that help determine compression ratios. The cylinder head also plays a big role in it. A 50cc cylinder head will have a higher compression than a 60cc head. The combustion chamber is made up of the cylinder head and piston area......(both play a role in compression ratios).

Pistons will also sometimes (ALOT of times with modular motors) have valve reliefs cut into the tops of them. These are provisions cut out of the top of the piston for extra valve clearance.

Mickey · September 17th, 2009, 02:12 AM

The actual "head" you are thinking about IS the piston

the rod that connects the piston to the crank is the rod...not part of the piston

Mickey · September 17th, 2009, 02:13 AM

Originally Posted by silverstang

they are exactly what they sound like. A dish piston actually has a small dish to it. A "flat top" piston actually is just that, a flat top on it. It is all used for compression ratios mostly. The deeper the dish, the less the compression. Flat tops will yield a higher compression ratio. Stock pistons IIRC are 6.5cc dish, which produces a 9.8.1 compression ratio with our cylinder heads. If you are building a supercharged/turbo motor, you want a lower compression than a naturally aspirated motor.

There are OTHER things that help determine compression ratios. The cylinder head also plays a big role in it. A 50cc cylinder head will have a higher compression than a 60cc head. The combustion chamber is made up of the cylinder head and piston area......(both play a role in compression ratios).

Pistons will also sometimes (ALOT of times with modular motors) have valve reliefs cut into the tops of them. These are provisions cut out of the top of the piston for extra valve clearance.

repped

07stanggt · September 17th, 2009, 06:02 PM

I really fucking hate that it tells me I have to spread some love when I try to rep some people

silverstang · September 17th, 2009, 11:39 PM

^Well if you wouldn't spread so much love to the same men all the time, it would let you!

david01130 · September 18th, 2009, 01:57 AM

OP: what are you trying to do?

trill gear head · September 18th, 2009, 02:30 AM

Originally Posted by 07stanggt

I really fucking hate that it tells me I have to spread some love when I try to rep some people

Done. I repped him for ya.

joshfrisco · September 18th, 2009, 01:48 PM

Originally Posted by david01130

OP: what are you trying to do?

researching on forged rotating assembly.

Mickey · September 18th, 2009, 08:20 PM

Originally Posted by joshfrisco

researching on forged rotating assembly.

He meant what you trying to do with the car...goals? plans? etc

joshfrisco · September 18th, 2009, 08:38 PM

Originally Posted by Mickey

He meant what you trying to do with the car...goals? plans? etc

plan on twin screwed Kenne Bell in the near future. just want to have confident rods and pistons for it. I'm thinkin about forged internals before charging it.

September 17th, 2009, 01:14 AM	#1
joshfrisco Newbie '08 Vapor GT Join Date: Jul 2009 Location: - Bay Area Posts: 34	Difference in piston heads..? . anyone know what the difference between Dished and Flat Top pistons? . __________________ VAPOR GT CREW MEMBER #01

September 17th, 2009, 02:09 AM	#2
silverstang Hardcore Enthusiast 2007 Mustang GT 11.70 Join Date: Mar 2008 Location: Buna, Texas Posts: 2,547	they are exactly what they sound like. A dish piston actually has a small dish to it. A "flat top" piston actually is just that, a flat top on it. It is all used for compression ratios mostly. The deeper the dish, the less the compression. Flat tops will yield a higher compression ratio. Stock pistons IIRC are 6.5cc dish, which produces a 9.8.1 compression ratio with our cylinder heads. If you are building a supercharged/turbo motor, you want a lower compression than a naturally aspirated motor. There are OTHER things that help determine compression ratios. The cylinder head also plays a big role in it. A 50cc cylinder head will have a higher compression than a 60cc head. The combustion chamber is made up of the cylinder head and piston area......(both play a role in compression ratios). Pistons will also sometimes (ALOT of times with modular motors) have valve reliefs cut into the tops of them. These are provisions cut out of the top of the piston for extra valve clearance. __________________ 11.80@118 11.70@114 Bassani Crew Member #3

September 17th, 2009, 02:12 AM	#3
Mickey I Post Entirely Way Too Much Join Date: Nov 2007 Posts: 6,171	The actual "head" you are thinking about IS the piston the rod that connects the piston to the crank is the rod...not part of the piston __________________ 488rwhp @ 6.9psi

September 17th, 2009, 11:39 PM	#6
silverstang Hardcore Enthusiast 2007 Mustang GT 11.70 Join Date: Mar 2008 Location: Buna, Texas Posts: 2,547	^Well if you wouldn't spread so much love to the same men all the time, it would let you! __________________ 11.80@118 11.70@114 Bassani Crew Member #3

September 18th, 2009, 01:57 AM	#7
david01130 Regular 2006 Saleen SC 35.643@65 Join Date: Dec 2008 Location: San Diego/Los Gatos Posts: 311	OP: what are you trying to do? __________________ www.ponyforums.com

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September 17th, 2009, 06:02 PM	#5
07stanggt I Post Entirely Way Too Much 2007 GT Join Date: Mar 2007 Location: Ellicott City, MD Posts: 11,946	I really fucking hate that it tells me I have to spread some love when I try to rep some people

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