Tried a search but could find nothing and I know this has been discussed before. B16 adjustible cam gears are supposed to fit on a DOHC ZC as I understand. What year range B16, there are several different cam gears depending on the year of the engine. Now before the smart remarks start, I have Exospeed Stage 2 regrinds, exospeed recomends adjustible cam gears and adjustible fuel regulator to get the most out of them (dyno tune of course). Any answers to my question anyone?

 

i ordered the srr b series cam gears from perpetualconcepts.com for my zc (i have the exospeed stage 2s also) and they worked perfect. everyone says you'll have problems with the b-series offset or timing marks, but thats not the truth with these. they were fine for me, my motor runs perfect. the timing belt rides right on the inside of the gear, doesnt hang off at all, its flush with the inside, but its not a problem at all. all i had to do was cut a tiny bit off the back timing belt cover (super easy, 5 second fix). i'd run the srr cam gears if i were you, i've had great luck with them and so have a couple of my buddies with ITR swaps and b16 swaps. i think exospeed actually sells srr stuff too. good luck man---ps, how do you like the stage 2 cams? are they in yet?

 

They are in, and I have 300 miles of the 500 mile breakin finished. can't wait to be able to open it up. I know people have had little improvements with cam gears on ZC's but that was generally with stock cams. I still have stock gears in it. Cost vs benifit is only thing that has kept me from buying them so far. I am not sticking something on it I would barely see if it gives me no noticible improvement in performance.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redzcstandardhatch &raquo;</TD></TR><TR><TD CLASS="quote">i ordered the srr b series cam gears from perpetualconcepts.com for my zc (i have the exospeed stage 2s also) and they worked perfect. everyone says you'll have problems with the b-series offset or timing marks, but thats not the truth with these. they were fine for me, my motor runs perfect. the timing belt rides right on the inside of the gear, doesnt hang off at all, its flush with the inside, but its not a problem at all. all i had to do was cut a tiny bit off the back timing belt cover (super easy, 5 second fix). i'd run the srr cam gears if i were you, i've had great luck with them and so have a couple of my buddies with ITR swaps and b16 swaps. i think exospeed actually sells srr stuff too. good luck man---ps, how do you like the stage 2 cams? are they in yet?</TD></TR></TABLE>

You have *****...I'd be worried shitless that they werent the right diameter which would result in a collision

 

You can tell and rough adjust them to stock specs buy stacking a factory gear just below it and lining things up. Diameters are the same index is a tad different but easy to adjust visually like I said. offset is a bit different but not enough to matter. Nothing really needs ***** when you do it that way. Was just confirming which B16 gears fit, I know of at least 3 diferent models from just one manufacturer depending on what year range. WHich ones are right the Del Sole Vtech or what?

 

When I think of it....it simply amazes me that DOHC works with no interfearance.

To my understanding, unless the ratio from the drive pulley to the cam gear is expressible by whole numbers....you'll eventually get an interfearance.

I wonder how accurate they need to be for the engine to be able to run 200 000 miles without any interfearance.

Hmm (thinking outloud):

200000 miles = 320 000 km
@ 100 km/h, the engine spins at say 3400 rpm
dooing 320 000 km would take 3200 hours @ 100km/h
or 652 800 000 revolutions of the motor

Say an offset of 5 degrees is acceptable, that equates to 5/360 of a revolution after 320 000 km

So the engine can take (5/360)/652 800 000 fractions of a revolution offset per revolution

Say the drive pulley has a diameter of 0.20 meters and the cam gear has a diameter of 0.1 meters

The exact ratio is 2:1 then.

But the max tolerable ratio is :
When the drive pulley does 1 turn, the cam gear can do 2 +/- the acceptable tolerance mentionned above turns or 2 +/- (5/360)/652 800 000 revolution.

Since the a 0.10 m radius equates a ratio of 2:1, what radius will equate a ratio
of 2 +/- (5/360)/652 800 000 : 1

Simple cross product (x/0.1)2 +/- (5/360)/652 800 000) /2
x = 0.1 +/- 0.1/2*(5/360)/652 800 000)
x = 0.1 +/- 1.06x10-12


Thats an error of 1 pico meter....dont have me believe they are that precise. Heck metal expansion due to heat would probably cause the radius to incrase more.

WTF???

Assuming they arent that precise, then the engine wouldnt be able to run nearly as long as 3200 hours before timing would become a serious issue. Allmost seems to suggest timing would have to be adjusted every so often.

Does it?

(sorry for thinking outloud)


Modified by Jet Black at 9:46 PM 12/18/2003

 

i had SKUNK2 adj cam gears an they worked fine. the only differnece with b series cam gears is that the timing belt will sit off centered towards the block, it wont sit right in the middle.

 

all b series cam gears are interchangeable, except the old *** prelude, they werent real b-series though. i stacked my srr cam gears on top of the zc ones and they were exactly the same diameter/teeth. they work flawlessly. i wouldnt mess around with something like that, i have too much money into my motor. havent dyno tuned yet, but i will once the ITB's are up and running. right now the gears are advanced 2.5 degrees each to compensate for head milling/thinner head gasket.

 

By offset it is the centerline of the gear surface to the centerline of the center hole where it mounts to the cam, exactly the same as offsets on rims. has nothing to do diameters which are the same on the B16 and the DOHC ZC, the Integra DOHC D16 has different size gears and won't work. Just to clear that part up. Also the timing marks will be offset from the ZC ones. I do undertand your logic about diameter differences, but remember the crank pully makes exactly 2 revolutions per single revolution of cam pulley. these are identical in diameter and tooth pitch of the B series. But since I have no friends with gears laying arounf I could look at I came here to ask.

 

so if they are all interchangeible whay are their 3 different sets of cam gears with different numbers for the Del sole the 99 and up and one other but I'm too lazy to go look for it now. But that answers my question.

 

i have no idea why the del sol has different cam gear numbers, but i know every b-series cam gear i've ever seen is identical, and i've read tons and tons of time that all b-series are the same. the timing marks on my srr's pointed up i believe, i just made magic-marker marks on the sides (horizontal, 90 degrees from the top), it worked perfectly. by offset, i think i mean the same thing as wheels. if i were you i'd buy the srr's, best deal. very easy to figure out how to install them.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by virginia_dude &raquo;</TD></TR><TR><TD CLASS="quote">By offset it is the centerline of the gear surface to the centerline of the center hole where it mounts to the cam, exactly the same as offsets on rims. has nothing to do diameters which are the same on the B16 and the DOHC ZC, the Integra DOHC D16 has different size gears and won't work. Just to clear that part up. Also the timing marks will be offset from the ZC ones. I do undertand your logic about diameter differences, but remember the crank pully makes exactly 2 revolutions per single revolution of cam pulley. these are identical in diameter and tooth pitch of the B series. But since I have no friends with gears laying arounf I could look at I came here to ask.</TD></TR></TABLE>

Well by my logic its impossible to make the gears exact enough to the system to work....there is no such thing as an exact 2:1 ratio due to metal exapanssion etc

But I found the solution..it was obvious and I completely ignored it.

Since the cam gears have a given ratio of teeth compared to the crank...its only the teeth number that counts as they advance the belt and not the actual radius of the gear.

Kinda obvious...but interesting to note why they are toothed

 

I see the point you were trying to make since one pulley is smaller than the other 2 it will expand less, but yes also due to the teeth being the determining issue it works.

 

Eaxclty....but even if metal expansion due to heat werent an issue

You could run into problems due to metal expansion from the "centrifugal force" of the pulley turning (think of dragster wheels how they suddenly increase in diameter when they take off)

You would also have problems in beieng able to achieve an accuracy of 10^-12 m

The teeth are the key.