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Honda makes forged 12.5:1 Compression pistons for our cars!!!

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Old Nov 19, 2002
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Honda makes forged 12.5:1 Compression pistons for our cars!!!

Civic GX Specs

Yup..on their natural gas model.... same bore..same stroke..12.5:1 compression!!!
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Old Nov 19, 2002
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you're gonna have to do more to that engine than just puttin those pistons on...
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Old Nov 19, 2002
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I doubt it..we have domed heads..the pistons are the same..just domed..they should fit no problem..but they may not leave enoughclwarance for an aftermarket cam..
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Old Nov 19, 2002
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He was referring to building up our bottom end, which I agree on, you'd prolly need a new crank and rods at the very least. Can't just up compression that much without building up the rest of the motor.
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Old Nov 19, 2002
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will someone please figure this out
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Old Nov 19, 2002
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sure you can..the OEM rods aren't that weak.. it's not under any boost so it's not a problem...the GX uses the same rods and crank as we do. heads a re a little different ..but cumbustion chambers are the same
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Old Nov 19, 2002
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Ok, so say we put these in our cars, what kind of gains are we talking about here?? I have a LX so my compression is pretty low, so what would the gains be?? and would they be worth it??

~nick~
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Old Nov 19, 2002
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well... rough estimate..about 11-13 HP and about 10 ft.lbs of torque right through the power band
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Old Nov 19, 2002
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stupid question, is high or low compression better for turbo/n20[IMG]i/expressions/face-icon-small-confused.gif[/IMG]
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Old Nov 19, 2002
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Hmmm, interesting... I'm thinkin that you'll need some high octane to run that compression. What octane do ya think would work? 92-93??
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Old Nov 19, 2002
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yeah, i have that same guestion too, cause i am almost finished with my turbo kit and want to know if this would be beneficial to me
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Old Nov 19, 2002
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in a perfect world, high compression and boost is most optimal but, since we have to deal with alot of variables, low compression and boost is most reliable and practical.
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Old Nov 19, 2002
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[hr]Originally posted by: CrazyCakes
stupid question, is high or low compression better for turbo/n20[IMG]i/expressions/face-icon-small-confused.gif[/IMG][hr]
I believe low compression is better for forced induction. somewhere in the 8-9:1 range is good. 12.5:1 is for going N/A.
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Old Nov 19, 2002
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if you're going to boost your car or run N2O lower compression is better.or keep the stock compression but get forged pistons for proper heat dissipation..

the 12.5:1 pistons might not be too beneficial, Ignition may have to be retarded to run them properly in which case gains may not be beneficial...11.5:1 is about the highest one can go without some serious ECU programming...

I can get 4 pistons made for $1400CAD at 11:5:1 compression... $800 fr the pistons $600 for the CNC program to make them. After their made it's only $800CAD ($500us) for the pistons as long as you have the job number (CNC program)
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Old Nov 19, 2002
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FI=lower compression NA=higher compression
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Old Nov 19, 2002
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also what the hizell is honda thinkin these days, that 2003 gx is not only natural gas powered but it has SULEV....next thing you know there wont be any emmsions at all.
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Old Nov 19, 2002
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[hr]Originally posted by: C2i0v0i1c
also what the hizell is honda thinkin these days, that 2003 gx is not only natural gas powered but it has SULEV....next thing you know there wont be any emmsions at all.[hr]
lol - far be it from a company being environmentally smart about their engineering

Wish there was some balance between the two - high performance, and low emissions - and I mean like ***** out 400 monster block power, but still won't create smog...oh well...gotta tip the scales to some degree right?
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Old Nov 19, 2002
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well honda makes a 240 HP 2.0L ULEV [IMG]i/expressions/face-icon-small-smile.gif[/IMG].. imagine if they used that technology to make a 3.0L V6
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Old Nov 19, 2002
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the s2k is ulev? really?
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Old Nov 19, 2002
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Yup S2k is ULEV. [IMG]i/expressions/face-icon-small-smile.gif[/IMG]

Changing the pistons works IF the head/block on the GX car is the exact same as the head/block on the 7th gen civic.

No, you don't need new rods or crank, as the rods and crank on your cars are forged and can probably take quite a bit of HP before ever having to change them. [IMG]i/expressions/face-icon-small-smile.gif[/IMG]

But there are many more clearances to measure, like piston to wall, piston to valve, etc, etc. So it may be more than just changing the pistons.
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Old Nov 19, 2002
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I called Honda in NY for this..the Blocks, Rods, cranks, combustion chambers and valves are all the same...the GX's have different cams and completely different injectors..the Pistons would fit no problem..but the compression is too high to be streetable..and without new cams, fuel map, Ignition system..it would probbaly hinder power...if their swapped in while retaining the stock ECU..Ignition will be retarded and power will be lost..
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Old Nov 19, 2002
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[hr]Originally posted by: TwilightX
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[hr]Originally posted by: C2i0v0i1c
also what the hizell is honda thinkin these days, that 2003 gx is not only natural gas powered but it has SULEV....next thing you know there wont be any emmsions at all.[hr]
lol - far be it from a company being environmentally smart about their engineering

Wish there was some balance between the two - high performance, and low emissions - and I mean like ***** out 400 monster block power, but still won't create smog...oh well...gotta tip the scales to some degree right? [hr]
how about the next NSX? it's supposed to be a hybrid. with the electric boost for added performance. and get 50% better fuel economy than all of its' competitors. about 400hp with the electric motor if i remember correctly.
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