How Variations in Pistion Size Change Affect Performance?

Techniq · April 14th, 2010, 09:09 PM

Just curious because I ran across someone who has 9cc pistons which seemed to me rather on the small side. So how would the difference in sizes change performance, particularly when dealing with boost? If my question seems to be a little to vague, ask I'll try my best to clarify.

DickH · April 14th, 2010, 09:15 PM

Different sizes are for different compression. You should try to get as much compression as you can pull off safely for whatever you are trying to do with your car.

Techniq · April 14th, 2010, 09:21 PM

So , my guess, the bigger the piston the lower the CR? He was running the 9cc Piston, Twin turbos on a New Edge Mach 1. Made a little over 500 rwhp @ 10 #'s but when he tried to up the boost he ran into a few problems, mainly on the upper end.

SWEET2KSTANG · April 14th, 2010, 10:24 PM

-xxcc is a dished piston, if no - then you are looking at a domed piston. more dish=lower compression. i bet he has -9cc dished piston, especially on boost.

Techniq · April 14th, 2010, 11:33 PM

Originally Posted by SWEET2KSTANG

-xxcc is a dished piston, if no - then you are looking at a domed piston. more dish=lower compression. i bet he has -9cc dished piston, especially on boost.

oh.... im still a bit lost. I'm just curious because I myself am running 21.1cc Dished Pistions. But what I'm getting from you the figure is more like -21.1cc?

SWEET2KSTANG · April 15th, 2010, 12:04 AM

correct. a +xxcc piston is domed and raises compression.

Techniq · April 15th, 2010, 12:58 AM

Thanks for clarifying. Feels good to learn something new.

iheartrwd · April 15th, 2010, 07:12 PM

Originally Posted by Techniq

Thanks for clarifying. Feels good to learn something new.

+1

April 14th, 2010, 09:09 PM	#1
Techniq Regular 2004 Mustang Mach 1 Will Run After Build! Join Date: Nov 2008 Location: Belleview, FL Posts: 364 iTrader: 0 reviews	How Variations in Pistion Size Change Affect Performance? Just curious because I ran across someone who has 9cc pistons which seemed to me rather on the small side. So how would the difference in sizes change performance, particularly when dealing with boost? If my question seems to be a little to vague, ask I'll try my best to clarify. __________________ 5.0L Cast Iron block/Forged internals-Melling Oil Pump w/Billet Gears-BBK Twin 65mm Throttle Body-BBK Longtube Headers-BBK O/R "x" Pipe- Maganflow Cats-B&M Sport Short Throw-Eibach Drag-Launch Springs-And Some More...Hope to run new set-up soon.

April 14th, 2010, 09:15 PM	#2
DickH MM Fanatic 2003 gt 5.4 32v on the way Join Date: May 2007 Location: Omaha Posts: 4,188 iTrader: 2 reviews	Different sizes are for different compression. You should try to get as much compression as you can pull off safely for whatever you are trying to do with your car. __________________ 2003 Mustang gt - usual mods - slowly working on 5.4 swap 2004 srt4 - Stock DD/winter beater Click here for your tuning needs Before asking a gearing related question click THIS link and enjoy all your saved time.

April 14th, 2010, 09:21 PM	#3
Techniq Regular 2004 Mustang Mach 1 Will Run After Build! Join Date: Nov 2008 Location: Belleview, FL Posts: 364 iTrader: 0 reviews	So , my guess, the bigger the piston the lower the CR? He was running the 9cc Piston, Twin turbos on a New Edge Mach 1. Made a little over 500 rwhp @ 10 #'s but when he tried to up the boost he ran into a few problems, mainly on the upper end. __________________ 5.0L Cast Iron block/Forged internals-Melling Oil Pump w/Billet Gears-BBK Twin 65mm Throttle Body-BBK Longtube Headers-BBK O/R "x" Pipe- Maganflow Cats-B&M Sport Short Throw-Eibach Drag-Launch Springs-And Some More...Hope to run new set-up soon.

April 14th, 2010, 10:24 PM	#4
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,540 iTrader: 8 reviews	-xxcc is a dished piston, if no - then you are looking at a domed piston. more dish=lower compression. i bet he has -9cc dished piston, especially on boost. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

April 15th, 2010, 12:04 AM	#6
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,540 iTrader: 8 reviews	correct. a +xxcc piston is domed and raises compression. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

April 15th, 2010, 12:58 AM	#7
Techniq Regular 2004 Mustang Mach 1 Will Run After Build! Join Date: Nov 2008 Location: Belleview, FL Posts: 364 iTrader: 0 reviews	Thanks for clarifying. Feels good to learn something new. __________________ 5.0L Cast Iron block/Forged internals-Melling Oil Pump w/Billet Gears-BBK Twin 65mm Throttle Body-BBK Longtube Headers-BBK O/R "x" Pipe- Maganflow Cats-B&M Sport Short Throw-Eibach Drag-Launch Springs-And Some More...Hope to run new set-up soon.

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