wakaranai

According to the Helms manual (STD=DX in this manual), both the intake and exhaust lobes are the same height...

I have always heard that the "Si" cam is more aggressive and that supposedly, the ZC one is even more aggressive.

Here is what Helms says:




So whats the deal? Have people been swapping out their b2 cam in vain?

BiG ChOr!Zo

iTrader: (1)

i say you re-scan that document...its so blurry that my eyes are spinning in circles

wakaranai

lol. I didn't scan this as I don't have a physical/tanglible Helms manual. I found this scan online. Although I do have a pdf version of the manual.

Nevertheless, here is what the chart reads:

Intake:

std m/t a/t and Si 36.603
HF 43.349

Exhaust:

std m/t and Si 36.747
a/t std 36.750
HF 37.567

es.roadster

they would be a big difference. you're in SF?
i have a sohc zc cam for you.
come by and pick it up if you wish. i'm trying to get rid of all my crap

Clipsed

iTrader: (2)

Yes, we all knew this, the one that is different is the ZC cam.

dr_latino999

I did not know this, I'm going to have to update my brain now.

freeagent

so would a zc cam fit in just about any single non vtec?
and the a6 isnt any differnt at all?

wakaranai

Oh, so people WERE aware that the a6 and b2 cam is identical?
Man, there are so many people who have replaced their b2 cam for an a6 cam for absolutely no reason and f'd up their timing lol

I have also read that the zc cam and the a6 cam is the same. Some people who measured them said they were very slightly different and others said they were identical??

Anyone have actual data?

BiG ChOr!Zo

iTrader: (1)

http://www.norcalcrx.org/tyson/SOHC_Cam.html

wakaranai

Exactly what I was looking for. Thanks.


So that being said, all of the people over the years who have swapped out their b2 cams for a6 cams have done so in vain right?

es.roadster

wakaranai, are you interested?
free a6 motor with a sohc zc camshaft.
i sure as hell noticed a difference.

my set up was, stock head/block d16a6.
-sohc zc camshaft
-96 d16y8 intake manifold (also have if you're interested..)
-cheapo megan header
-2 1/2" injen intake w/hks mushroom filter

so i've ran my car through a couple of butt dynos,
bone stock d16a6 with intake and header felt nice. kept up with my friends intake and header 94 gsr.

then i swapped out the a6 intake manifold with the y8 intake manifold. felt like it was more free flowing and had a little more topend.

then finally, grabbed a sohc zc cam. after this. it felt like my current setup ( b18a1 with gsr tranny ). and i'm serious. it was just a different motor so to speak.

also, my car is obd1 (90 civic std) i was using a p06 ecu..

**forgot to add, i had a 90 crx si tranny

wakaranai

PM'd

Tyson

i dont think youve necessarily found proof.

the part numbers are different.
14111-PM6-A10
14111-PM5-A50

to me that means they clearly are not the same.

as for the service manual, well that doesnt give much description really. what if timing is different? duration?

as for my zc cam comparison, ive proven that they are physically different by one aspect alone. and thats all i need to "prove" they are different. to prove they are the same, youd have to measure them completely in all aspects.

but really? who cares... its all a stock cam.

btw, who said the SOHC ZC cam is the same as the A6? no one with any credibility is saying that from what i've read.

dacrxguy

could this be because of smog issues legaly you cant put pm6 parts in pm5 (heads, manifolds, blocks)

89s1

They are different, they've been measured out and its been proven they are different....

wakaranai

Well, a lot of part #'s are different while the parts are identical.

I'm glad I asked this question because I just realized I had a total brain fart. You are right, cam lobe height is only one of many elements to this equation.

Well at least iI finally confirmed that the zc cam (s) are not the same as the a6 cam. I had not seen any concrete information till now.

Thanks

Clipsed

iTrader: (2)

exhaust lobes are what differ in terms of duration. rofl, I laugh at the n00bies.

Tyson

like what?

wakaranai

One thing in particular that comes to mind is axles.

Tyson

si and dx axles are different..... the damper is on the si.

next?

DCRB

idk if i did the swap in vein or what not, but i sure noticed a difference.

my set up was:
d15b1 mpfi swapped, z6 intake mani with ls tb, injen intake pipe to stock air box with paper filter si cam with y8 cam gear, ebay header, 2.5" s2 test pipe to a 2.5" obx-r legit catback, si trans... **** SMASHED hella quick, butt dyno would throw me in my seat pretty well. bounced it off the rev limiter all the time with out trying, broke loose all the time dry or wet, and kept up with my buddy's b20vtec em1 up hill in third till he cracked vtec and i was trying to wrap out gears before i set ignition timing.

back on topic, my friend showed me his std cam, and there is a visual difference in lobe height compared to a b2/si cam.

wakaranai

I was/am unaware of this. But, thanks for the distinction. I will look this up.

Perhaps, I exaggerated a bit. I was thinking more about interchangeability, which is irrelevant.

Rotors? *grasping at straws