wat color wire is it?

i just noticed this tread, good luck with everything man

Just a note... shaving down your head will increase compression.... Milling off a few thousandths off your head is an easy and cheap effective way to increase compression withought going to a more domed piston and worrying about your valves nailing the piston (which is bad)...

Since you are increasing the compression of your motor, you will need to take somwhat the route of the turbo guys. To not eat holes throught those nice new pistons if yours you should get some sort of fuel management, because if you run lean and starve the engine it can get very ugly. Only bummer is you will alway have to drive with octane boost while turbo kids can just lower the boost.

yeah, i'm with that other guy, good luck with all this. i'll check back to see how it all goes

oh i meant shaving the head of the piston... a lil more so the compression would drop from 12.5 to 12. but thats still high... i will see about lowering it to the porsche 959's 11:7. at least that is lower and wont knock on premium

Chrissy,

the porsche 959 (not leagal in the us) had a compression (off-boost_ of 8.3:1

with boost, it operated at an effective compression of 13.2:1

as for porting and polishing, it's honestly not worth the money unless you REALLY want everything that engine has to give you.

on a fully built d17a (all motor or turbo) expect to see no more then a 5hp gain, and be warned that if done wrong will hurt your torque. the reason for this is simple, YES you need to flow more air, but if the passages are TOO smooth and there's no turbulence, it hinders the atomization of your fuel. porting and polishing is a fine art, or even "VOODOO" to do it right by hand you need a flow bench, or, if you have the money and can find someone who has the machine, there is a machine that uses crushed up walnut shells and forces them thru the head, like a cross between a flow bench and a sandblaster... PM me if you need more info on that...

a 3 angle or multi-angle vavle job will help flow the air into the cylinder, but it will do more than just that, it will also position the air in the cylinder better for more thourough combustion. this process is ratrher genaric and there's little in the way of "art" with it. you should see gains of 1-3ft-lbs and 2-6hp

with regard to shaving your pistons... make sure it's done right and the compression is VERY simliar in all the cylinders... too far off and you are more likely to blow a head gasket because of uneven force/pressure

good luck! i'm eager to see some turbo smashing numbers!!!!

umm.... how does that work.... shaving down means that you are removing material... if you look at the other thread about the high compression pistons, you can see that the gx pistons have more material than the standard ex pistons...

so if the pistons take up less volume, then why would you have a higher compression?!?!?!?

Intresting.

try and get it down to 11.7 and see how it runs, but i really think you need a fuel managment sytem.

Well, another way fix the knocking is watering injection. Its actualy a cheaper way of cooling your engine down. What your realy doing by running rich is dumping more fuel to cool the engine down. But your still going to need so kind of fuel mang. system.

Look up the the spearco no turbo water injector.

would a block gurad help in this case?

I was refering to milling the head down, which i though she was talkign about because when you usally shave/mill your head. Milling the head decrease the dome of the cylinder head bumping up compression since there is less area. She didn't specify that she was shaving the pistons down.

Hmm..very interesting. You should have started with a compression of 12:1 or less.

why didnt you deal with the rest of the engine internals at the same time. It would have been safer for your engine that way. I highly recomend some time of fuel managment system and usiong the ocatne boosters isnt really sloving the knockiong problem its still there. Its a temporary fix to a permanent problem.

Ack...i have never seen such a messy post....of mis information....i think there was only two decent posts in this whole thread.....



first make sure you know what the cel is on for...i dont know if you need a scan tool with the new 01+ civics or not but here is a chart for the codes
http://www.clubsi.com/error_codes.shtml

find out how to pull the codes using the mil (malfunction indicator lamp).
if you dont need a dealer scan tool.

2nd dont guess at your comp. ratio go do a search on how to guestimate it...its pointless to say you may have 12.1 when you honestly have no idea.....

here is a general idea..you can find most of the information you need from the dealer or a factory manual.

http://www.nateswaterart.com/vw/calculating_cr/

3rd...yes you will prolly need an afc and to possibly change the current fuel system to one like the previous generation that has a fuel return with regulator...

you can then go to someone with a dyno and a wideband o2 sensor and tune your car slightly witht he afc...your still going to be lacking in the ignition area...no idea there...i only started to drive an 02 civic about 2 weeks ago....

if you gona knock on me and talk **** on me... i have had experiance with b20 vtec with toda c's and itbs as well as a built 2k itr with 12:1 comp and toda c's both running hondata stage 2 and pushing 200+..i dont claim to know all but i know when theres way to much false information......

here is just a sample of the untuned b20vtec, 12:1, stock b16 head, toda c's full toda valve train and custom itbs.

http://home.comcast.net/~b.meihack/itb1.avi

Dam, nice intake setup. Haven't seen one like that in a while. Now thats the best way to go na. What would setup like that run? I'm thinking in $1000 range

BTW, If an octane booster says it raises octane by 8 points, what it means is it will raise the octane rating from 91 to 91.8. So i'd reccomend going w/ 100 octane gas from 76 or sunoco or something. You should be able to run the GX pistons on that. I would also recommend a plug upgrade (a colder plug)

By shaving the pistons' heads, you are destroying the dome design, making it less efficient. All you will end up doing is reducing your bang/ buck ratio!!

yeah you can even get 117 octane from union 76,
but it is like 35 bucks for 5 gallons!
I'd like to know you 1/4 mile times and when you get it
dynoed, let me know?? k?

yeah wheres the dyno this post has been sitting around for a wile..with a **** ton of bad information....at the least get an afc...and run 93....

Um, she already removed the pistons. It was too much of a hassle.

yah the only hassle was miss information and not listening...you can run 12.5:1 on normal 92-93 octane pump gas, all she would have had to do is change out the fuel system style to one with a regulator and a return line and get an afc... ack...way mor ehasle envolved in removing the pistons than actually doing what was needed...if they were actually installed...

loss of words of the bas information on this baord...ack

Amen, Brother!
If you have major problems like these, asking a bunch of guys on a car forum is the last place to get good info. Props to the ones that know what they're talking about, but honestly, most don't.
My point: Ask an experienced engine builder that HAS BUILT small import engines...and not your average ford/chevy wrench turner.

Will you marry me Chrissy...jj...

No really, will you!? lol....

Keep up the great work!

dont wanna pick on what seems to be everyones obsession, but i think this thread could have benefited if you knew what you were talking about

hey.. someone had to try it...

and again.....i didnt know that she had taken them out...but it prolly is very good that she did.....

oh and she is pregnant..and having bad morning sickness....that is why she hasnt been on here in a long while......

but i will say, she had the "*****" to do this....too bad she had horrible info from this forum......

like was said before....i dont ask for any major info from this site...just tid bits here and there, that if anyone had any type of skills at all they could do it, i just ask and see if someone has done it before.....cause if they have, they will know the best and quickest way to get it done...(Y)

I'll say that I don't think my .02 cents was bad info. Water injection would have helped if not stopped the her ping problem. She could have stayed with it or used it tell she found somthing better.

Some people may call water injection band aid. You can't deny that it works!

yeah it may work, and in this situation its band aid, but it would not be the proper thing to do...for the money it would take to get a water injection system up and running you could have done the proper fuel system...also water injection is mainly based for turbo/super charger motors, Its kinda a pointless thing to do when its not running right in the first place... and you would need to solve the issue for a constant time period where as water injection would probably be used to help cope with heat soak, and extremely hot period where you ripping on the car.