Hatchg

Just got a jdm b18c long block from a very trustworthy and reputable supplier (hmotorsonline). He gave me the choice of a motor with manual cams or auto cams, with auto cams having a less aggressive lift profile for lower rpm. I chose manual, but my question is: how would you tell the difference beetween the two without actually measuring the cam lobe. Is there a certain stamp on the head or something?

thewrai6th

The part # would be stamped on the cam, not the head. But I do not think Honda cams are stamped with part #. You may have to identify them visually like this:
https://honda-tech.com/forums/acura-...hafts-1220152/
If you feel like pulling them out and posting a pic, someone can probably identify them for you.

Hatchg

Yea, i can't actually take them out of the head or it voids the warantee. I can take the valve cover off and turn the crank to rotate the cams to see it, unless the number is under a cap or something. Do you know where the number would be on the camshaft?

PHAT-INTEGRA

Why does cams matter if it's auto or manual? Please do explain because I love some one explain this to me

Hatchg

This is only what i was told by my motor importor. I am not claiming to know for a fact. Honda made a jdm specific SiR model crx or something, dont quote me on the model. But it used a b18c gsr with an auto transmission. Honda used cams with a less aggressive lift profile on these motors and the redline is 7000 instead of 8000. Other than that I believe there is no difference

thewrai6th

Previous post is correct, as far as I know. There was a SirG (GSR) auto in JDM.
As far as the differences, it will be lift, degree and duration of the lobes on the cam. You'd have to get out the micrometer to check the specifics.

wunfstgsr

Yep have to pull the cam cap off and check the end ive never seen anything on indentifying Auto GSR cams, but wouldnt be hard to swap them out for usdm gsr cams if there not but they will void your warranty but i wouldnt worrie about it they should of sent the correct engine you paid for.

PHAT-INTEGRA

I know there was a SIR-G Automatic in Japan. Japan and USDM Cams will have different specs. There is VTEC and Non-VTEC cams but never heard of auto/manual cams.

You take a LS/RS/GS/SE manual and a LS/RS/GS/SE Automatic will they have the same cams? yes it will have the same spec cams it does not matter if it's auto or manual there all Non-VTEC cams.

Then you take a JDM SIR-G manual and JDM SIR-G Automatic they use the same Engine spec (same cams spec). The only different is the ECU and Transmission.

thewrai6th

My guess would be different power band/ECU, redline is 7000 for the JDM auto?
As far as USDM models, you are correct, they are the same part #.

tony_2018

You have to pull cams to identify.

tony_2018

Ooooohhh...there does seem to be multiple camshafts for both intake and exhaust. This is interesting.

tony_2018

So for documentation sake

Manual b18c



Automatic b18c

thewrai6th

Interesting find, where did you pull those part #s from?

Hatchg

so you seem to know the answer to your own question than so why ask? Your popcorn eating emoji tells me you were looking to start drama. thats what i hate about these forums, but hey, do what makes you happy

wunfstgsr

http://asia.vtec.net/beystock/integra/art2/index.html

tony_2018

Good stuff here

Japanese cars online catalogs

tony_2018

Damn...the automatic totally robbed the gsr of some power.

tony_2018

Its called debate/discussion. No need to get your panties in a bunch.

Hatchg

ohhhh, i must have miss read said persons intentions. My apologies sir.

wunfstgsr

​​​​​​​Yes the transmission and accsesories and ecu is the major diffrence, i do beleive reading someone measured the cam lobes and they were the same as manual.

PHAT-INTEGRA

You need to read the thread carefully before judging some one. I want to know where the OP online store told him there is auto and manual cams. I been in the Honda games for a long time (I'm in my 40s). This is the first time I have ever heard automatic and manual cams. I hate to see a buyer (OP) get shafted. That's like some one telling a female you need headlight washer fluid.


Just to make you all happy. I'm running a JDM CTR cams with ITR piston in my fully built GS/VTEC Automatic (JDM SIR-G) on a chip JDM P30 ECU tune on Neptune.

I have built a B20/VTEC (GSR head) on Hondata. I also have built a 454 on supercharge w/blower in my old Nova with a 4speed manual and a 502 for my cousin El Camino.

wunfstgsr

​​​​​​​

Hatchg

impressive. to answer your question, hmotorsonline sold me the motor and told me of this difference beetween the cams. Actually a few other motor importers that sell b18c gsr's put the word AUTO in the description when listing a motor for sale if it is from an automatic model. You will find this if you look for gsr motors on ebay. You are 100% correct in that there is usually no difference in the motor if its auto or manual, but Why would they feel the need to list it is auto if there is no difference in the motor. I am not claiming to know for fact but each importer that i asked claimed that the auto version has different lift duration. I am sure you know very much and no ones judging anyone. You learn more everyday and therefore you never know it all. Keep an open mind

tony_2018

I think the only remedy is to do a b20/vtec, LOL.

Hatchg

You are correct, just clarified with steve from hmotorsonline. I ordered a gsr head(specifically asked for one from an auto model) to use for my leftover b18b, since i will be replacing cams anyway. I will post pics of measurments when i get a chance, but they are the same size cam lobes.