Need detailed information

[shadowboy]

I need detailed information from people more informed than I am.

I need the cam timing (valve open timing, valve close timing, lift, and duration at 0.050") for the following sets of camshafts:

1: Black top D16A1 (88-89 USDM Integra).

2: Brown top ZC, more specifically the 135ps variant (Civic/CRX Si or JDM 3dr Integra GSi or RSi (only for the 135ps variant. i don't care about the 115 or 120ps variants of the brown top, as my cams came out of a 135ps ZC).

3: Black top EF type ZC cams (the common 130ps DOHC ZC).

I have at least one set of each of these camshafts and I would like to get a rough idea which cams to use.

Right now I am leaning towards using a blacktop ZC intake cam and a brown top ZC exhaust cam (for a few reasons).


I already have some of the specs. I have the specs for duration @ 0.050" & lift for black top ZC and black top D16A1 cams. I need the valve open timing for these cams, and all the specs for the 135ps brown top cams.

[JDMEF7]

Cant give you detailed info off the top of my head but what I can tell you which might be useful is you will notice the cams are all marked differntly i.e R1 R2 R3 & R4, as far as I can gather these are the different grinds or versions of the same cam.
All my Black top ZC engines have R3 & R4 cams in them, however I have a set of Brown top regrinds which are R1 inlet & R2 ext. The Brown top cams also are missing the PM7 stamp in the middle but are a straight fit into the black top head. I used Black top ZC skunkworks adjustable gears which also went straight onto the brown top cams.

[shadowboy]

Cant give you detailed info off the top of my head but what I can tell you which might be useful is you will notice the cams are all marked differntly i.e R1 R2 R3 & R4, as far as I can gather these are the different grinds or versions of the same cam.
All my Black top ZC engines have R3 & R4 cams in them, however I have a set of Brown top regrinds which are R1 inlet & R2 ext. The Brown top cams also are missing the PM7 stamp in the middle but are a straight fit into the black top head. I used Black top ZC skunkworks adjustable gears which also went straight onto the brown top cams.


I am not looking for identifying information. I already know what they look like, what stampings are on them, and which ones are which.

I am not asking for compatibility information either. I already know that all 3 of these sets of cams will work fine in a D16A1 head. I also know about the keyway issue with 2g ZC cams on a D16A1 head due to the change in the number of teeth. My question is about the cam timing. ie, when do the valves open, when do they close, how far do they open, and what is the 0.050" duration. I need this information in desktop dyno so I can get a general idea on what I want to do (ie, which mixture of black top / brown top cams I need to use to get the kind of power curve I want).

[JDMEF7]

I am not looking for identifying information. I already know what they look like, what stampings are on them, and which ones are which.

I am not asking for compatibility information either. I already know that all 3 of these sets of cams will work fine in a D16A1 head. I also know about the keyway issue with 2g ZC cams on a D16A1 head due to the change in the number of teeth. My question is about the cam timing. ie, when do the valves open, when do they close, how far do they open, and what is the 0.050" duration. I need this information in desktop dyno so I can get a general idea on what I want to do (ie, which mixture of black top / brown top cams I need to use to get the kind of power curve I want).

And I'm saying you're wasting your time asking for information by engine type, the chances of finding all that info recorded for all four cam profiles in each engine is little to none.

You missed my point I was warning you incase you didn't know to look for the different coded cams, just because they came out of a particular engine wont mean they will be a corresponding spec every time.

For instance we know Brown Top ZC's came out with combinations of R1 and R2 cams there are four possibilites there alone, R1 Inlet and Ext, R2 Inlet and Ext, R1 inlet R2 Ext, R2 inlet R1 ext.

I could give you the specs of a set of black top ZC cams a freind of mine had reprofiled have but it will be of little use to you unless you know what code the cams were to begin with. At the time of profiling the R3 and R4 codes were not known about and weren't recorded so this info is only useful for the cams that were profiled.
The cams are long gone now so the codes cant be checked.
Without knowing what code they were they are useless to use as reference for the info you are after.

This information cost him $240

ZC EF CRX Black top '88 - '91

Dur 240/260
@050" 184/191
Camlift 202/217"
Valvelift 303/325"