jdm92_accorn : 1992 Accord LX

[cb9love]

rocker arms have been on my mind lately, when reading Honda build threads you don't see much about swapping in new rocker arms on builds when swapping in new cams.
If you don't swap your rocker arms do you do anything to recondition them before a cam swap?

[jdm92_accorn]

not sure, that's why im doing a before and after dyno comparison to see if there is anything to be gained from it. i would think there is due to flat spots in the rocker pads over long periods of use. this could effect ramp rates, duration and lift. my question has always been by how much. im waiting on a set as of right now and i plan to use the a6 head that is currently on the a6 in the car currently. im going to adjust the valves, dyno the car, let it cool, swap rockers, adjust the valves and dyno again. i'll be doing 4-5 pulls each to make sure the data is as accurate as possible. after designing my cams a few times now im starting to pay more attention to valvetrain details, lol. i want to build another 250whp f-series, this time with more reliability.

[Lucien]

Damn, i love this thread. It's like information heaven.

Accorn, how much of a restriction do you think an a4 header running to a 2.5" collector-back exhaust would be, over something like a bisi or hytech running to 2.5"?

I just discovered my stock a1 header is cracked. Living in SoCal, i'd like to retain the factory heat shield for subterfuge. So the plan is to pick up an a4 header at the jy this weekend and have a vibrant 2.5" collector welded on.

[mugencivic4dr]

not sure, that's why im doing a before and after dyno comparison to see if there is anything to be gained from it. i would think there is due to flat spots in the rocker pads over long periods of use. this could effect ramp rates, duration and lift. my question has always been by how much. im waiting on a set as of right now and i plan to use the a6 head that is currently on the a6 in the car currently. im going to adjust the valves, dyno the car, let it cool, swap rockers, adjust the valves and dyno again. i'll be doing 4-5 pulls each to make sure the data is as accurate as possible. after designing my cams a few times now im starting to pay more attention to valvetrain details, lol. i want to build another 250whp f-series, this time with more reliability.

thats something i would love to see. i'm currently debating to work on my a6 or go for an H22 SC auto swap. 250whp is a goal that is in mind as well for a daily, thats enough to zoom in and out of daily traffic lol.

[jdm92_accorn]

almost done with testing. will post results in a few.

[jdm92_accorn]

we started today at 10am and just finished about 8pm

first off old rockers vs new


non ported vs ported ( 8888 to 0000 ) f22a6 runners and f22b dohc plenum


stock 62mm s2000 throttle body vs bored and tapered JDM H23A vtec throttle body 70>64mm


my custom web regrind vs bisimoto level 2


what i started with and what we finished with all testin was done with the shop closed up and exhaust venting out through exhaust hoses to keep the climate as controlled as possible. humidity was a steady 34-36% and ambient temp was in the 64-66deg F range. elevation is 33ft above sea level.
the rocker comparison was 3hrs apart, intake manifold comparison was 28mins apart, throttle body comparison was 2-3mins apart, and camshafts were about 5hrs apart, had a boo boo and dropped a bolt down the in the timing cover, lol.


the peak numbers are impressive but the real fun is the across the board power. at 3500rpm there is about 20wtq gain, on average its a 13wtq gain and 14wtq peak gain. the largest whp gain of 17whp is at 5200rpm and peak for peak is about 13whp. 163whp/152wtq before and 176whp/166wtq after. no tuning was done until the camshaft was changed.

just for giggles F22A6 end results vs the last F23A non vtec combo. its funny how from 3600-3700rpm they make about the same power, lol. it must be a bad harmonic rpm for the intake or header.


im done for a little while till all my bottom end parts are here

[InvaderTrax]

So is this Web cam available to anyone? Or is it a secret?

[jdm92_accorn]

i cant give all my secrets away, lol. i got out my measuring tools and degreed in both cams on the new rocker arms when we were swapping things around today.

bisimoto level 2
intake opens ATDC: 4deg
intake closes ABDC: 44deg
exhaust opens BBDC: 41deg
exhaust closes ATDC: 1deg
intake duration: 220deg
intake centerline: 114deg
exhaust duration: 222deg
exhaust centerline: 110deg
overlap -3deg
measure valve lift in/ex: .405"/.392"

my custom web
intake opens ATDC: 2deg
intake closes ABDC: 46deg
exhaust opens BBDC: 44deg
exhaust closes ATDC: 4deg
intake duration: 224deg
intake centerline: 114deg
exhaust duration: 228deg
exhaust centerline: 110deg
overlap: 2deg
measure valve lift in/ex: .430"/.417"


dont ever say i dont give to my fellow cb7 community, lol. i may be trying something a little more radical on the f22a6 later on but for now it's tolerable until the f23 is completed.

[InvaderTrax]

I've not been able to find that Web 148 can on their website. They show a #15/273 and 13/273

[jdm92_accorn]

You have to call about it.

[Lucien]

Holy shit. All the data...it's beautiful.

[djcaz_aom]

Good stuff. This thread is so full of great information.

[sonikaccord]

I might have to take a trip to NC. Do you own a dyno or something cause I know that much time isn't cheap?

[jdm92_accorn]

One of my best friend owns a speed shop, Carolina Dyno.

[InvaderTrax]

Might have to bring mine out there when its done and let someone tune it who really understands these engines