SOHC ZC Pistons.

[Apex001]

Well I am ready for my build. And before I decide how much to deck the head and piston combo, I would like to know the actual CR of a sohc ZC. And if anyone knows what pistons are in there. I believe that the sohc ZC does not use the dome pistons like the dohc zc, which pistons does it use or is the block similar to the z6 bottem end? Any input would be great. Thanks!

Build as below.

- JDM SOHC ZC bottom end
- ?? Vitara or ? Pistons
- ITB's or Y8/Teg TB ** ITBs are choice **
- Noszle direct port NOS <-- definately there.
- Z6 ported/polished head
- RS Machine stainless valves/springs and Cam grind to NOS or crazy V-tec spec. ( I gotta talk to RS to figure the best grind depending on setup)

Any thoughts or recommendations would be helpfull.

[fast88]

you are correct the SOHC does not use the DOHC pistons. The SOHC block is basically an A6 block.

- JDM SOHC ZC bottom end
Stock rods for No2? Also if your going to DP no2 what's the minimum shot you can use? Last I chaecked it was 75. What are you going to use?

- ?? Vitara or ? Pistons
vitara pistons are overrated. get some OEM pistons and find the compression # you want using this http://www.knology.net/~jediklc/D.htm

- ITB's or Y8/Teg TB ** ITBs are choice **
Get a Y8 manifold and TB. I can tell already that you will not like ITB's They are "choice" if your road racing. Your haven't listed any kind of ECU control or mods to tune them. I'm also going to take a wild guess that this is your street ride your modding.

- Noszle direct port NOS <-- definately there.[/QUOTE

ummm....expensive but ok. Wouldn't it be easier to just direct port the manifold and use a regular nitrous kit?

[QUOTE]- Z6 ported/polished head
OK

- RS Machine stainless valves/springs and Cam grind to NOS or crazy V-tec spec. ( I gotta talk to RS to figure the best grind depending on setup)

valves and springs are nice, cam okaaaaay......what does crazy VTEC spec mean? (and BTW it is VTEC not V-tec)

Hope you find these thoughts and recommendations helpful

[Apex001]

as far as the block goes, thats the info Im looking for. I did use the calc but I dont think the 'ZC' applies to a sohc engine. I do know that it does not use dome pistons. As far as rods go, Im not to worried, I wont be squeezing everyday. If the blocks seems to be similar as an A6 block then it might be the CR Im looking for. As far as ITB's, since it will be a streetable car I dont mind it much, I dont plan to make a trailer queen out of my hatch. I do have a y8 mani and a teg TB sitting around along with some other stuff I might be putting up for sale in the forum. Not sure what to do as of yet with it. I allready have a setup for NOS and I can use anything from 50 - 125 if I like. I have the jets to tune it. As far as RS goes, like I said depending on my setup I'll talk to RS, they are close friends with our Team so Im sure I can get the perfect grind from them along with springs etc.. And well to be on the technical side its actually V.T.E.C (Variable Valve Timing and Lift Electronic Control) hence forth the V-TEC. :)

[HumanResource]

Well I am ready for my build. And before I decide how much to deck the head and piston combo, I would like to know the actual CR of a sohc ZC. And if anyone knows what pistons are in there. I believe that the sohc ZC does not use the dome pistons like the dohc zc, which pistons does it use or is the block similar to the z6 bottem end? Any input would be great. Thanks!

Build as below.

- JDM SOHC ZC bottom end
- ?? Vitara or ? Pistons
- ITB's or Y8/Teg TB ** ITBs are choice **
- Noszle direct port NOS <-- definately there.
- Z6 ported/polished head
- RS Machine stainless valves/springs and Cam grind to NOS or crazy V-tec spec. ( I gotta talk to RS to figure the best grind depending on setup)

Any thoughts or recommendations would be helpfull.

Raised compression AND Nitrous???
As long as you got DETONATION in a headlock you should be able to squeeze up to 60-65 on stock Fuel system, 75 running rich and some kinda ignition retarding like MSD

[SoHc 4 U]

well your talkin about nitrous on a stock rods....i say ne thing over a 75 shot with ur other mods won't hold... i believe stock d rods only are good for about 200hp correct me if im wrong... get a set of eagle rods with oem pistons (high compression) continued with ur other mods... and get it tuned first before u put a kit to it.... just my opinion tho....

[jozzy]

the jdm sochc zc vtec carries the p28 dish type pistons

[fast88]

And well to be on the technical side its actually V.T.E.C (Variable Valve Timing and Lift Electronic Control) hence forth the V-TEC


Hmmm...Honda doesn't seem to think so. I don't see a hypenated acronym anywhere in any Honda literature. Antenically if you were to hypenate the acronym correctly it would be V-T-EC Its hyphenated where a word or descriptor is left out.


Why you would go with ITBs for a car that is on the streets is beyond me. too each his own. I can guarantee that you'll be here asking us why your car wont idle and has narrow power band. Maybe RS and the mAd KrAzy V-TEC SpeC caM y0! will make it all work out for you.

[Apex001]

well like you said to each there own, I do however take your input and others under consideration. but once again the correct acronym would be vv-t-elc, but we'll just keep it as that. I do tend to road race from time to time for fun. so ITB's would be ok for me. the Y8 mani is there just in case I choose otherwise. and Yo DaT CrAzY MaD aZz GrInD will be the ShIzNik, B! but that will be under the watchfull eye of RS. We'll see how it goes.

[builthatch]

Well I am ready for my build. And before I decide how much to deck the head and piston combo, I would like to know the actual CR of a sohc ZC. And if anyone knows what pistons are in there. I believe that the sohc ZC does not use the dome pistons like the dohc zc, which pistons does it use or is the block similar to the z6 bottem end? Any input would be great. Thanks!

Build as below.

- JDM SOHC ZC bottom end
- ?? Vitara or ? Pistons
- ITB's or Y8/Teg TB ** ITBs are choice **
- Noszle direct port NOS <-- definately there.
- Z6 ported/polished head
- RS Machine stainless valves/springs and Cam grind to NOS or crazy V-tec spec. ( I gotta talk to RS to figure the best grind depending on setup)

Any thoughts or recommendations would be helpfull.
Just some info for everyone, something to file away...
http://a4.cpimg.com/image/D0/93/37613264-cb2b-02000159-.jpg
I am pretty sure those pistons in the sohc vtec ZC are indeed the same as z6. Everything is the same 'cept the ecu and japan's 100 octane and maybe a slightly more aggrresive cam profile- that would account for the extra 5 hp over the US spec z6.

[builthatch]

well like you said to each there own, I do however take your input and others under consideration. but once again the correct acronym would be vv-t-elc, but we'll just keep it as that. I do tend to road race from time to time for fun. so ITB's would be ok for me. the Y8 mani is there just in case I choose otherwise. and Yo DaT CrAzY MaD aZz GrInD will be the ShIzNik, B! but that will be under the watchfull eye of RS. We'll see how it goes.ITB's on a street car are fine if you have the engine management and cam profile to match. Remember, the e30 M3 uses ITB's and has plenty of torque for a 4cyl (175 ft/lbs!)

About spraying on stock rods: if you are using a big-ass profile cam, that means you will have to spin it to make HP, and spinning that thing AND spraying is too much stress for those lil toothpick rods. NA, you can rev to the MOON if you change the rod bolts and shot-peen and/or cryo them. With spraying though, the sudden increase of cylinder pressure with juice will only amplify the stresses of high-rpm use and BOOM!...IMO, of course ; )

[fast88]

well like you said to each there own, I do however take your input and others under consideration. but once again the correct acronym would be vv-t-elc, but we'll just keep it as that. I do tend to road race from time to time for fun. so ITB's would be ok for me. the Y8 mani is there just in case I choose otherwise. and Yo DaT CrAzY MaD aZz GrInD will be the ShIzNik, B! but that will be under the watchfull eye of RS. We'll see how it goes.
HAHAHA

That's cool man at least you can take it and dish it! Some folks can't handle sarcasim. Good luck keep us posted.

[Apex001]

hehe thanks. the itbs are on the way. I'll take a grip of pics and post something on the DIY on CBR ITB setup. :) There will be a EMS prob turboedit on my pm6, with serial connection and stuff. hope it goes well, Im doing this on my own so I'll be chipping cutting and tuning. I have a few peeps I can talk to on tuning but for the most part I like to do the work myself. I'll also do a write up on PM6 chipping and serial connection with tons of pics to help out other EF'ers.

BuiltHatch, thanks for the info on the SOHC ZC. Ive been looking for that type of data for a while. Good looking out!

Hey Fast88, just remember...Sarcasim weeds out the weak! hehe I'll keep you guys posted on the project.

Thanks for the input and info.!

[sohcfreak]

would anybody havepictures of itb's on there sohc...?