1G EP4604 Cams?

[4gfun]

You must be logged in to view this image or video.

You must be logged in to view this image or video.

I did some searching around on here and google, but found nothing definitive.

I'd like to know what cams these are.

Searching yielded Brian Crowers, Crowers and specifically not BC, and Comp Cams.

Searching also yielded that I should see etching by either turning the cams or the cam ends.

I really would like to know which to do, rather than do more work than needed, One cam has D1 engraved in it, and the other has D2 engraved in it. C1 & C2 were also found on the cams. Also CWC and F4.

Thoughts?

Thanks!

 

[BogusSVO]

The EP number is the cam blank, the same one is used by several cam manufactures.

http://www.dsmtuners.com/threads/camshaft-identification-information.435135/

Also some cam grinders etch on the front face of the cam, so you would have to drop the timing belt and remove the cam gear.

 

[4gfun]

The EP number is the cam blank, the same one is used by several cam manufactures.

http://www.dsmtuners.com/threads/camshaft-identification-information.435135/

Also some cam grinders etch on the front face of the cam, so you would have to drop the timing belt and remove the cam gear.

Looks like this is what is happening here, not willing to drop the timing belt YET.

The cams do say CWC on them, doesn't that mean something? Could I measure the lobes and find out that way?

I found this as well:

http://www.dsmtalk.com/forums/showthread.php?t=171331

Thanks!

 

[streetraceboi]

They should have some actual etching in them. If not....they just might be some clean stock cams..

 

[4gfun]

They should have some actual etching in them. If not....they just might be some clean stock cams..

The etching might be by the cam gears. There is no way that these can be stock with CWC on them. At least, that is what I *think*.

 

[Canadian_CD9A]

The numbers share commonality with Web Cams, mic them and you'll know.

 

[BogusSVO]

http://www.dsmtuners.com/threads/how-to-figure-a-camshafts-lift.450028/#post153121578

Web is a regrinder like delta

 

[4gfun]

Thanks, will come back and let you know.

 

[Tiki2777]

Thanks, will come back and let you know.

Those are all the markings my old comp 101200 cams had on them, but of course they also had etched into them the comp serial number.

 

[4gfun]

http://www.dsmtuners.com/threads/how-to-figure-a-camshafts-lift.450028/#post153121578

Web is a regrinder like delta

Bogus....I did the math but notice that manufacturers list lift as "gross lift" instead of "net lift". Is there some compensation factor?

Example:

http://www.crower.com/media/pdf/2008b/105-108.pdf

 

[BogusSVO]

Divide by the rocker ratio. 1.7 or 1.73 depending on the cam manufacture.

So take the Stage 4 PN 64415-2 cam, intake

With a gross lift of .425

.425 /1.7=.250 net lift

 

[4gfun]

Thanks. Your link makes it seem that the final calculation is for gross lift not net lift.

The numbers in that link are commensurate with what seem to be typical cam numbers.

Did you mean to say gross lift at the end of your writeup?

I did the math on the cams that I have using your instructions and the numbers came out to be VERY close to the GROSS numbers specified for most cams in general with no further math required.

 

[BogusSVO]

Yes I apparently selected the incorrect word that led to your confusion. Sorry for that.

 

[4gfun]

Yes I apparently selected the incorrect word that led to your confusion. Sorry for that.

That's ok. Less math!

Well I used a Harbor Freight Micrometer and got the following measurements based upon 1.7 RR:

.3961 inch lift for the intake cam

.3689 inch lift for the exhaust cam.

I am not an engine expert, but I am a "google" expert and everything that I have found leads me to believe that these are Crower Cams.

Original owner advises 272/272 cams, but these numbers fall a little short. (A little hard to get GREAT measurements with the cams still installed).

Looking at the lift for the intake cam and the Crower specs that I attached, the cam could be a 272. I can't say very much for the exhaust cam though. Could some wear be involved?

The car is pretty lopey at idle.

Crower has the URL to this thread. I am awaiting an email back from them.

 

[1990TSIAWDTALON]

Attached is a BC Cams profile for comparisom.

 

[4gfun]

Attached is a BC Cams profile for comparisom.

Thanks....totally different lift, so I can rule that out.

 

[BogusSVO]

One more place to check for an etching is on the "collar" just behind the #1 cam cap.

Also, You do realize That Brian Crower and BC is the same company?

 

[4gfun]

One more place to check for an etching is on the "collar" just behind the #1 cam cap.

Also, You do realize That Brian Crower and BC is the same company?

Thanks for that. My understanding is that Brian Crower and BC is the same company, but Crower is not the same company as Brian Crower or BC.

 

[BogusSVO]

But the owners of Crower and BC are family. But correct, they are 2 seperate companies.

 

[4gfun]

But the owners of Crower and BC are family. But correct, they are 2 seperate companies.

Some falling out seems to have taken place. I can't wait to try your suggestion out!