[joshfrisco]

.







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







.

 

[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.

 

[Mickey]

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]

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]

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

 

[silverstang]

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

 

[david01130]

OP: what are you trying to do?

 

[trill gear head]

I really ****ing 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]

OP: what are you trying to do?

researching on forged rotating assembly.





:rockon

 

[Mickey]

researching on forged rotating assembly.





:rockon

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

 

[joshfrisco]

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.