I have an SOHC cam and I'm not sure if it's out of the D16A6 or the SOHC ZC. Does anyone know how to tell them apart? Thanks for the help!

 

http://crxcommunity.com/viewtopic.php?p=65019

 

theres no distinguishing mark or identification on the cam or pulley, unless its the carb version, which has the glaringly obvious fuel pump cam lobe at the end.

you can measure it with a mic or caliper and compare. i dont know what the end to end measurements of the lobe are, as thats not how you measure a cam. but it should be different between A6 and JDM ZC.

 

great, thanks for the info. I know mine isn't carbed because there isn't the fuel pump lobe on it, but I don't have a degree wheel to check my cam. Does anyone have an A6 cam that they can measure with a set of dial calipers or something, out of the head? I just want to know what I've got so I can sell it to somebody who wants/needs it. Thanks for the help!

 

theyre pretty much identical. i wouldnt care if it was a ZC or A6 quite frankly, the differences are so minimal.

 

I know the SOHC ZC carbed cam and the A6 are nearly identical, but the MPFI SOHC ZC is a bit different. Matters to some people. I have a guy interested in it if it is the MPFI ZC, so that's why I'm askin for help on this. Anybody have some measurements of either a A6 cam or an SOHC ZC MPFI cam? I appreciate the help.

 

did you read the chart?


its the carb cam thats different, in exhaust lobe and timing and whatnot. not much, but a lot more different than the zc mpfi cam, which only has the intake lift different. same timing.

get a mic and measure the outer distance of the intake and exhaust lobes. ill measure mine and ill tell you what it is.

 

I have a spare A6 cam I can attempt to measure... do you mean measure the largest part of the lobe diameters?

 

Yeah of course I read the chart. I can see that all three cams have slight differences. They don't matter much to me, but I'm trying to sell this cam and I can't remember which motor it's from. I don't want to sell somebody something and not know what it is for sure. I hate when people do that to me!

So I left my dial indicator at work and I suppose I don't need a degree wheel to check the peak lift. With that measurement I can tell the cams apart, so I'll do that after the holiday.

Fireant: if you can measure your A6 cam with a dial caliper and just measure the fattest part of the cam lobe (intake and exhaust) then I can do the same since I have my dial caliper at home. That way I know for sure which cam it is. Thanks for the help!

Merry Christmas guys!

 

peak lifts above were all measured by a dial caliper mounted on a head. zero'd out to the base circle on the opposite end.

if you can measure that independently, feel free to share and verify our results (which 3 sources have already verified independently, but whatever... some ppl are stilll not convinced.)

 

I trust your results, I believe there is a difference between the cams, it's about the only difference between the motors and since they're stamped differently I'm sure there has to be some difference right?
I just don't have my dial indicator until I go back to work on Monday and I was hoping to know sooner than that. Oh well. I'll just wait and measure it then. Thanks for the help guys. Hope your Christmas was awesome!

 

bump

 

I'm lost. If the cams are so similar, where does the ~10 extra HP come from?

 

Most likely from the difference in exhaust manifolds and/or ecu.

 

3 letters.....JDM!!! haha no seriously if you put 2 cars on a dyno one having a fresh d16a6 and the other with a fresh zc im guessing they would put down very similar numbers and you couldnt feel it, better off just buying an aftermarket cam.

 

yeah it's true, the cams are very similar, but to some people they want a cheap cam that'll get them some power. Most things you do to a D series are small gains unless it's forced induction, so we're all out for just a little bit more.

I'm just trying to figure out what cam i have for sure, that's why I started this thread. No need to debate on if you'd feel it on your butt dynomometer. Thanks for the help guys.

 

I have a SOHC ZC rebuilt to factory specs. I am VERY curious about the numbers it puts down...I really should dyno it.

 

the manifold alone would be a huge improvement.

105-108hp rating of the D16A6 is completely baseless. with simple IHE my d1616 made over 110 on a dynojet, at the wheels. so did other A6's tested that day.

 

So I checked my cam with it installed in the head and the dial indicator on the valve face in the combustion chamber.
I cam up with 9.60 mm of lift. Looking at the numbers on the chart on the crx forum posted above my numbers don't match up at all. They're numbers in the chart are in inches and mine are in mm, but they aren't even close! Anybody have an A6 or ZC mpfi cam they can dial the same way for me?
Please really need the help!