cbr itb's on my zc(sweeeeeeeeeettttttttt)

[rhdef7]

I just got my crb600 f4i itb's on my car about a week ago and they are awsome along with the gearing of my zc tranny this car pulls really good!!!!! I just need to get some tuning on it to get the full potential of the motor. when winter sets in then the motor will come out and get built. I'm going to keep it a allmotor high comp. beast!!!!! here is a link www.cardomain.com/ride/2449600/2

[Dweezil]

Swwet, keep it up. What's going in the motor?

[rhdef7]

I'm going to have the bottom end rebuilt new bearings,oil pump,water pump, rings, seals, and have the block decked .010. the top end will get a port and polish job(I want it to flow close to 300 cfm) new stainless steal valves and a 3 angle valve job and I will have it milled like .030 to raise the compression.
stage 2 cam regrinds from exospeed and some adjustable cam gears, maybe some bigger itb's like cbr 1000 or something. Msd ignition system, dc4-1 header, buddy club cat back exaust, and a few more other things I can't remeber right now

[rushi]

Nice job, and good for you if those tiny ITBs make some good power.

300CFM (@28inH2O I suppose) would be almost impossible with D-series head I think. My Z6 head flows ~240CFM intake and ~174CFM exhaust(12mm lift), and that is very good for D-series head. And remember, if you polish your intake ports, you will hurt the flow, fuel economy and emissions with that head; don't do it. Leave port surface just like it is after grinding, or sanding the port with 40...60grit is good also (valve bowls 80...120 grit). I polish my exhaust ports to prevent carbon buildup.

I think cr of 11.5 - 12:1 would be nice, dunno if you can get it high enough with just machining the block/head. How about Crespo Cams stage 4, they look promising.

Keep up the good work, and nice that someone is building high power all-motor DOHC engine. Have you more/better photos of your intake manifold/ITB-setup? Keep us posted.

[rhdef7]

yeah there is a guy in vegas (dh-racing.com) that says that he has had a single cam vtec head flowing 300 cfm before. as for cams I don't want to do to crazy because I live in the middle of no where and my car is a daily driver. I don't want to go any more than 11.5:1 compression with 91 octane(detonation problems) isn't 40 to rough to use for that??? I will get some more pics tonight

[Dweezil]

Search about them before sending anything to them, if I remember they diden't have a great reputation as a machine shop.

[rhdef7]

yeah I know who he is I did sokme trade work for him. He is a good guy but when it comes to getting stuff done and taking care of his prioritys he is not so good at so thats why I will do my head my self. I have an old 91 ls head in my shop right now that has some burnt valves so that will be my practice head so when I do mine I get it right the first time. I 'll have new pics up in a few mins.

[rhdef7]

here are some more pics (hope it works)

[primercrxSi91]

JIS is good

JISengine.com

[AllmotorRex]

kickass man. nice job

[rushi]

Man, you're missing velocity stacks (aka ram pipes), they're absolutely essential for making power! I dunno what size those small ITBs are at the end, but my CBR954rr 42mm ones measured slighly over 47mm and Dellorto DHLA 45 stacks are a perfect fit after cutting of the flange.

Seems you've put stock injectors, why? Again, atleast those 954 injectors are better than stock (they flow more, and are 12-hole disc type = better atomization).

That 300cfm might be possible, but you would need larger valves and propably even larger cylinder bore. Then comes question, what's the point spending $$$$ for head and flow that is ever needed, especially if you're not looking for radical cams? D-series is somewhat power-restricted to ~200hp(that 240CFM is plenty for that), because of bad rod/stroke ratio and undersquare cylinders (not reasonable to rev past 8k, even with built bottom-end). Drag engines are different thing.

My opinion, correct if you can prove me wrong 8)

[4Door Life]

damn man, i need a sound clip for this... ill bet the itb's sound awesome along with the exhaust...

[gimmezell]

damn man, i need a sound clip for this... ill bet the itb's sound awesome along with the exhaust...

I vote for this also. Sound clip please!

[rhdef7]

sorry guys I dont have the stuff to do the sound. plus I have a crappy exaust on it right now so it doesn't sound the best.

the reason I left in stock injectors is because they are low impedence injectors and the bike ones are high impedence injectors it was just easier to plug and play. the car still makes plenty of power with the stock injectors but I do need to get some tuning on the car.

as for flow your right I'm just looking for the right flow to get the air and fuel in and exaust out as fast and effecient as possible. I do need to get velocity stacks for itbut I have to custon make them so I will see what I can do. I used to own a 69 bug with dual 40 idf webers and the stacks make a huge difference.

[rushi]

You can use high-impedance injectors simply by removing and bypassing the resistor box.

This is how I made my stacks;
http://personal.inet.fi/surf/rushi/vstacks1.jpg
all the way to
http://personal.inet.fi/surf/rushi/vstacks6.jpg
Hope this helps.

[rhdef7]

thanks for the how to on stacks are they for dellorto's or webers??? I know I could of bypassed the resister box but I comverted the car to rhd and I wanted to leave as much of the wiring un cut. I know I can clean it up after wards but I wanted to leave the wiring as stock as possible. thanks for all the help I'll keep you guys posted

[rhdef7]

ok guys here is a little update I just got a dc sports header for $100 looks brand new the guy said that he only used it on his car for a few months and it was only on a fully gutted quarter mole car. I also got some cbr954 itb's comming in(pics soon) and I know it's not for the motor but I got a momo gt something racing seat so I'll put that in to.comming in about 3 weeks a buddy club exhaust cat back.

[90JDMED3]

Nice Job..

[rhdef7]

new pics of my 954's there not going on yet I want to get some extentions welded on my flange first so everything will look clean and work the best, enjoy for now.

[Eyal 951]

Nice!

I want ITB's!

[d16z6_eg-6_boi]

those are some nice itb's... keep up the good work.. tell me more about it

[rushi]

Check here for some construction tips; http://rushi.kapsi.fi/pics/d16z6/itb/

My setup is workin good so far, I'm right now gonna install TPS and injector connectors and then fire it up with my new engine 8)
And those velocity stacks are for Dellorto DHLA45.

Oh BTW don't cut/drill/block those original MAP hose niples if you're using speed-density based ECU (=Honda PGM-FI).
I use only TPS, so I don't need accurate load-related MAP. That log is mainly for idlecontrol/brakebooster/fpr. CBR original MAP-lines are good, use them if you have to.

[labatt2k]

check this diy on itb... this thing almost look easy to do
http://honda-tech.com/zerothread?id=1796381

[rhdef7]

yeah I'm useing the stock zc map sensor, my 945's that just came in came with a map sensor also but I think I will still use the zc one. I think I'm going to go with turboedit tuning mainly because I dont have money to convert over to obd1 plus I hear that it is pretty good and easy to tune. and yes rushi I will use the cbr injectors this time.

thanks everyone for the help and support so far!!!!!!

and another question how much should I mill the head to get the compression to sit at about 11:1?????

[Eyal 951]

what block, head and pistons do you have? Its probably gonna take more then milling the head unless you have already swapped pistons.

[superdewey58]

sweet lets see some numbers when its runnin good

[rhdef7]

dohc zc motor stock head dome pistons stock block

[rattmann316]

god damn blurry owns you...i guess its a nice setup

[rhdef7]

sorry I guess i'll have to go and get a better camera

[blue92HB]

I have seen other sites out there but here is one to help figure out the compression ratio's. http://www.knology.net/~jediklc/dcalc.htm If the doesn't work type D series compression calculator into google and go from there.

[commandoBear]

nice work, any bigger pics?

[rhdef7]

thanks blue it looks like I have to mill the head .060 to get it to sit a 11:1 so thats cool.

I put my 954 itb's on last friday and I used the cbr velocity stacks and rushi you were completely right the stacks make a huge difference in power. I'm going to get ready to pull the motor and start the rebuild in a couple of weeks I found a beater car to go to work with. sorry I don't have an pics yet the weather has been pretty crappy lately.

with this set up do you think I can hit 13's in the quarter??

91 hatch gutted back
dohc zc trans
11:1 comp.
stage 3 or 4 cams
port n polish
msd ignition
dc 4-1 header
and some tuning(I was going to go turboedit or should I go obd1 with crome??)
buddy club spec 2 catback

[marcin]

you will see problems with tip in enrichment with turbo edit. Although, you could tune idle and WOT, the part throttle is going to be a mess as well. It seems like the hard way but obd1 is really the way to do it.

just my .02 from experiance. good luck
m.