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i am looking into a turbo EX project and am in need for stronger rods, i am too cheap to buy the crower ones for 785 bucks!!!! i was wanting to know if anybody has a reliable source of info that would tell about how much the GX rods can handle. i only want about 250 whp. they are of course a direct replacement and are stronger than the gasoline powered civic rods bc of the more powerful combustion cycle. now i know there are tons of people using the GX pistons for all motor bc of the higher compression, it's time to look into the rods now. the GX seems to be a GREAT source for OEM performance parts....thanks Honda!!! FYI they use hardeed valves and springs also.

BTW: you can get the pistons and rods cheap through these guys

hondaautomotiveparts.com/auto/jsp/mws/prddisplay.jsp?inputstate=5&catcgry1=Civic&catcgry 2=1998&catcgry3=4DR+GX+W%2FABS&catcgry4=KA5MT&catc gry5=CRANKSHAFT-PISTON

 
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I'm gonna go out on a limb and say you're on your own with GX parts. Someone, a long time ago made a futile attempt at a high compression gas engine by using the CNG pistons other bits and it failed miserably. I will also say it probably wasn't the best attempt at getting it right either.
I'm thinking you'll have to buy some and have a lab test them if you want to know whether or not they'll handle more power or not.

 
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It is a fact that they are stronger. when honda announced the GX version of the 7th gen they also stated the differences, which stronger rods were stated. i'm not going high compression, so i will not be using the pistons. has anybody used just the GX rods with low comp. pistons. everybody wants to use the pistons, but they dont have them milled down to a reasonable comp., lets say 11:1, thats why their engines fail, and poor tuning of course.

 
Rep Power: 424

Its a fact that they're stronger... whoopdy do. First, thats not what you asked and second I can claim the moon is made of cheese if I want. You can shot peen a set of stock rods and make them stronger, doesn't tell you anything quantitative about it.
You ARE going high compression, what the hell do you think shoving positive pressure into the engine does? If boost didn't raise your effective compression, you wouldn't make any power, you wouldn't have to worry about stronger rods and you wouldn't be fighting high cylinder temps. You wanted to know how much they handle, and i'm telling you, you're going to have to buy a set and have them tested if you want to know just how much they'll be able to take. Honda doesn't publish tech specs like the tensile strength of their rods. I have never seen anyone independently publish that information anywhere. There's either a reason no one's tried it or no ones thought to try it. The GX is quite obscure since its not sold everywhere. Get a set of the OEM gasoline ones, get the CNG ones and have them tested.
If you're more a fan of practical testing, install a set, get a boost controller and pay for some dyno time. Let us know when it blows.
If you're smart enough to do the combustion equations, you should be able to get the work done in a cycle and convert that to mechanical force, and you ought to be able to figure out how much force is exerted on the rods through the combustion of CNG at 12.5:1 vs gasoline at 9.9:1 and should be able to get a theoretical minimum that it must handle to keep the thing in one piece, but at 6800 RPMs, a whole lot more than that is gonna come in. You'll need to model the direction change of the rods and the tension/compression exerted on them to figure out what condition will cause them to fail first.

 
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youre on here to try to make me look retarded when u are. when u replied to me the first time, you said somebody used the pistons when i clearly stated rods in my post. idiot. so if ya want to make yourself look dumb, then you did. CONGRATS! but you did try to answer the rod question in your second post so i guess thanks.

 
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You need to learn to read, then you need to get a clue what you're doing. I blanket covered the whole GX with the statement, you're on your own. There's one attempt that was made... with GX pistons, OTHER BITS and it failed miserably. I don't remember what all was involved, it was tried 2 or 3 years ago. And finally, all the second post did was re-iterate the first one, buy parts, go to the lab, test, post results. Also.... it doesn't mean they'll hold boost. There's high compression (so called "All Motor" rods) and there's turbo rods, both of which are structured differently because of the forces incurred, and you can shape the profile of the rod to show strength where you want it and take away material where you don't need it. N/A rods are never as strong as turbo rods and they're almost always lighter as well. The crower rods are made for turbo apps, and they're made to take more than you can throw at them. Even if its made for 12.5:1, 8.5 psi at 10:1 makes ~12.5:1 effective compression, and that wouldn't get you anywhere near 250 HP, at 9:1 you're up to 13 lbs for 12.5:1 effective. All this is assumed on a theoretical compressor that sized correctly for the engine's airflow. And thats what it MAY HANDLE. The rest of the motor isn't gonna like running 12.5:1.
But thats enough, you think you're so ****in smart, you can figure out the rest of it on your own, assuming you actually know what you're doing.

 
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Hondahoodlum you dumbass you posted the same thing on d-series and i told you it wasnt going to work. The highest you can run for daily driving is 11.2 or so on 93 octane. With nos youll blo ur brains out on a stock block. But hey prove us wrong.

 
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wow man way to make friends here. your the one that isnt listening here. it is explained to you in laymans terms and your still struggling to understand. i think you need to learn more abou thte basics of a motor and how it reacts to boost before you ever try anything like this. your making yourself sound like an idiot with this post. boilermaker is a great guy who contributes a lot to this site. he does know what he is talking abou tyou just cant handle the truth because its not what you want to hear

 
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jesus!! now dkid15 thinks im talking about the pistons too....RODS, RODS,RODS!!! yo dkid why wont the RODS work, they are the same, except stronger. i know boilermaker knows what he is talkin about, i didnt question that. he seems VERY intelligent, the only thing i questioned is the fact that he stated the use of the gx piston....im not using the piston but he did address the rod later on and i thanked him....im not trying to be a jerk! but i might have a short block on the way and i will get the GX RODS and have them shot peened. its a fact these rods are stronger than the a2 rods and shot peening makes them even stronger. i hope this will hold 225whp at least. i guess ill find out. when i do ill let yall knowin the distant future.

 
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basically what they are saying is forget your idea

 
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stock rods are already hold that power. there are several people here that have gotten 225whp+ with a completely stock bottom end.

 
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"Hondahoodlum", everyone is trying to tell you that it will work but you are not going to have guaranteed results. ITS ALL ABOUT THE RISK, do you want to use untested methods and parts. The rods will take the power, just like our stock EX rods, but for a very short amount of time. If you want to risk having your motor fail when you least expect it, OR you want to be a pioneer and prove all of us wrong PLEASE DO. I would like to see how this all turns out.