egizzle8

I am curious on how to keep the rocker arm locked to keep vtec constantly ingaged. I was thinking of running a toggle switch but I don't want to forget it on and end up burning it up. Any suggestions? Yeah your probably wondering stupid newb or why the hell do you wanna run on constant vtec? Well my lil project is to use a hx head but run it on a chipped p06(nonvtec) and with it on constant vtecand the rockers constantly locked so I won't have to worry about the vtec-e setup or vtec at all and just keep it on the running on 4 valves all the time and on the primary lobe which is where the power and the 2nd intake valve to open. The solenoid usually activates roughly around 3k and then it's both intake valves open and then runs on 4 valves instead of 3. Any suggestions? This is what happens when I sit and think about things too long and have too much time on my hands and a steady supply of sohc engines to work with! God I love these engines!

Combustion Contraption

bump, that idea might just actually go....

RedlinedVTEC

I'll save my breath and tell you to do a search. I've seen several posts asking the same question.

egizzle8

Dude you ain't saving anything. I've read the majority of the useable HX posts here and still interested in this. Telling someone to search just means you don't know. Plus the search won't work with typing in "HX" being the word is too small. "Words 2 characters and shorter are not indexed" Now I'm just asking after properly searching "d16y5" and looking through all the useable posts made. How can I safely permanently lock the rockers together so all 4 valves will open instead of just the 3 and then not have to use that useless secondary lobe besides a toggle switch? If all else fails I may just use a switch but I don't wanna really go down that route. I haven't received my head yet to see it inside but how do DOHC vtec heads use things like the vtec killer cams and eliminate the vtec mechanism? The only problem I see with running on strictly on the primary lobe and never seeing that secondary lobe is driving under 3k before vtec would hit but how would the car run under on the primary lobe? Would it still bog cause with other ideas before people still wanted to run or were running a vtec setup and using the secondary lobe on the cam to start out with.


Modified by egizzle6 at 12:01 PM 12/12/2004

drdisco69

My guess would be to machine a pin that fits in the holes where the vtec pins slide, and is long enough to lock everything together. You'll have to take everything apart and measure and install them, but if you've got a bunch of those motors, it should be no problem.

Disclaimer: I know as much about D series as I know about what you had for lunch yesterday, but I assume the HX heads are the same as all the other vtec heads in the way they engage vtec.

NightmareApex

a blind shot in the dark, but you mentioned the b-series vtec killer cams, which are used with a remapped ecu, so u could umber/hondata a ecu to allow u to run v-tec all the time.

drdisco69

You could just set the vtec activation point to like 16 rpm...

RedlinedVTEC

VTEC killer cams come with new rocker arms.

egizzle8

how unreliable would I make it if I welded the locking pin in place for the rocker arms to make stay so to say " constant vtec" but really since nothing is being activated and a nonvtec ecu is being used it's really being turned into a non vtec setup.

ReV LiMiT

due to curiosity, when i had my (d16z6) sohc vtec in my old 88 crx si i took a power wire from the battery and the vtec wire from the soleniod and touched them together.

first i was thinking about using a toggle switch and only use vtec when i wanted to race, but i then i also started to think about constant vtec so i tried it out...and once again, the ******* motor stalled.

with the toggle switch, the lowest vtec worked was about 2500-3000 rpm without the car bogging.

besides why would u want vtec all the time? dont u like the way vtec feels when it kicks in at a higher rpm? and youd even save gas like that too...

MugenRacerX

vtec lobes on all the time would **** you for low end power and toda already has the design in the vtec killers,you get a real good idea of the vtec killer in the one best motoring video battle at 10krpm driftking said it had no tq below 6k wich was not idea for the roadcourse,might be niice on the dragstrip tho.

v4lu3s

i have done that with a race engine by placing small washers in the rocker arms to farce the pins to lock the rockers together.

hxtasy

if you run a toggle, i dont think it would be a good idea becuase, one,
i would think it were bad to run vtec at low rpm (low oil pressure)

once it is locked it proly wont come out, but with some throttle tapping abuse maybe.
that and on my b16, vtec doesnt work until the engine is almost normal temperature, and you have to be rolling at least 10 mph for it to work, to prevent no load revving,
which i guess would be bad since the honda engineers made it this way.

another thing is, it would be nice to have some low end torq, which i belive you would definatly gain with the different cam settings (b16 not vtec-i or whatever musical valve selector siht), so you wouldnt have to down shift as much, but the way i see it on my car, and i have not really been with other vtec cars, but you hit vtec at 4800 in mine, rev out first to 8200 drop second, and you are at about 6200, so you are still in vtec up til fith gear, so it would only help you to spin wheels more in first gear.
and that is a little advantage compared to getting a **** load more gas milage.

another thing if you cut yoru solenoid wire it will throw a code make sure you put a load resistor on it so the computer still sees the solenoid being there and workign properly (22 ohm load)

if i wanted to lock it, i would go about hammering the pin in and welding it there. as it doesnt hold that much force, onces its seated in there.

good luck

egizzle8

I think alot of you are thinking along the lines of a normal vtec head and it's operations. I'm planning on using a HX(vtec-e) and it using a p06(nonvtec) ecu. I wouldn't need a vtec ecu since it would have all the rocker arms locked anyway and I wouldn't need a vtec ecu and strictly tune the car off it's primary lobe which actually is bigger than the y8 cam. Now it's just how the car would run just on that lobe under the usual activation point. I may just weld the piston in place to lock all the arms together and go from there.

v4lu3s

we had thought abotu welding hte piston into place, or the rocker arms togethr, but decided goign with a small washer in place to force the pistons out would be better since ti was reversible.
we also chose to use a non vtec ecu though it was a pr4 in our case, rechipped, since we dont plan an seeing anything below 5 k rpm at any time with the engine we put the washers in.

egizzle8

I thought this was interesting from a similiar thread I made on sohchonda.com and a educated response I recieved along with nice pics

"As you can see there isn't a lobe for the one valve on the rocker arm. Honda found that with this head (in my mind) that useing a roller rocker would keep down wear with only using one lobe on the cam as a driver for both valves. On 3 lobe Vtec cams the LMA and the VTEC lobes are not used until 4500-5500 to 7200-8K (depedning on the set-up) Thus not enough to create a lot of wear. Locking VTEC in on HX is easy just move the pin over and use a spacer pin and remove the spring in the assembley. Yes the HX uses a sping in the assemble as well as oil pressure to move the pin. So be careful with doing this. One gain that I found while owning the HX was to put in an EX ECU, switch to 4-wire O2 and it broke the tires loose at 3200 where the first cross over point was. Just an idea.

Another problem that you are going to run into...The cam has less wear and less roating mass. Thus makes it ideal for high RPMs. The HX loves nitrous due to the cam profile. I have no idea what and the reason behind honda's alienated HX head but the cam is good, look at the profile numbers on it. I still have my cam if you want it...I'm willing to part with it pending you send me a stocker back if you want Wil @ Exospeed to grind one for you. So finding a cam is going to be very hard. But if are up to the venture I know 2 places that will help make one/grind one. I sold the custom one I had. It kept up with EX and SIs no problems. This would be a very dangerious set-up that would get amazing gas milage. The ECU would have to be completely custom. Running an EX base re-tuned and re-worked for this set-up. Vtec cross over would have to around 3300-3500 from one valve to two valve. The HX head would infact have to be signifetly ported. A LOT.

Lobe Height
HX...
IN Prime...1.5129"
IN Sec......1.2674"
EX............1.5269"
(hmm nice turbo cam if both valves opened)
EX...(D16Y8)
In Prime....1.4479"
IN Sec.......1.4592"
IN Mid.......1.5068"
EX.............1.4964"
Spring heights free standing
HX
IN...2.22
EX...2.28
EX (D16Y8)
IN...2.28
EX...2.31

Rocker arm specs I can't find my notes on disks or written ones...If I remember correctly it was something around (in 1.67 ex 1.9) I can't remember exactly. This truely was an intresting head to play with...I might re-visit it here some time and have it running again after the turbo car gets built. I liked the 45mpg untuned with 40psi of fuel.