Cam Identification revisited...

[Guest Anonymous]

I've got a cam I've had for years.

Bought it when I was a dumbass kid.

It doesn't appear to be a regrind.

The guy who sold it to me said it was BMW.

It's got a '4' stamped on the gear flange.

The two front journals are oversize.

It's got a number in the casting that's really rough, but it looks like:

8 118 081 00 032 or

B 119 081 00 032

The person who correctly identifies this cam first receives a genuine, limited edition 'you're cool, man' from yours truly.

-g

[Guest Anonymous]

Cams are in the number group 11 31 0 631 xxx range.

Sorry,

John N

[Guest Anonymous]

...got an AE2 cast between cylinders 1 and 2. The A and E are capitalized and underlined. The 2 has no underline.

The other numbers are cast between 3 and 4.

Still stumped.

-g

[Guest Anonymous]

I forgot to mention that the total lift measures out to approximately .3295 on one lobe and .3155 on the other by my meager measurement methods.

-g

[Guest Anonymous]

It appears to have a near zero lift duration of 218-219.

What's the stock rocker ratio?

What's the lift work out to?

Does shrick, for instance, measure duration at zero or 0.050?

I feel like Radio Shack.

"You've got questions, and frankly, so do we."

-g

[Guest Anonymous]

Been there, done that!

I have the back-in-the-day published specs + have measured these from my own collection.

You almost measured the lobe lift correctly, but you are way off on your method for duration.

This cam lift is 0.320" for intake & exhaust, so you were kinda close when you said: "approximately .3295 on one lobe and .3155 on the other by my meager measurement methods".

But the advertised duration for this cam is found with 0.011" clearance between the cam lobe & rocker pad, NOT at zero or 0.050" and NOT at stock running clearance.

Note that I said the measuring clearance is taken at the cam lobe-to-rocker pad, NOT the normal valve stem tip-to-rocker eccentric.

Please tell me the size of the fist & second journals, the base circle, and try the duration check again. (Hint: It's a very round number)

Then I recommend you package it real nice & ship it too me for "test" purposes! ;q)

// John

[Guest Anonymous]

He said it had a #4 stamped on it, but the lift mentioned does not match that cam.

An original #4 has .340" of cam lift & 324 degrees duration the way BMW measures it.

// John

[Guest Anonymous]

Did you run this in one of your cars?

What was it like?

How'd you have it set up?

I'm gonna run this thing.

-g

[Guest Anonymous]

Thanks! I'm stoked!

The casting of yours is much clearer than mine, but yes. That's it!

Any and all information I can get on this thing would be really appreciated.

So, what would the advertised lift be?

I'll go measure the dimensions you asked for in a bit here.

Write me off-list if you like at mcglener@aol.com.

Heh. I bought this thing in '89 for a hundred bucks.

-g

[Guest Anonymous]

Hey John,

You asked for size of first and second journals and base circle.

The first (at the flange) measures at 1.7685 inches (44.9199 mm).

The second (middle) measures at 1.7300 inches (43.9420 mm).

I don't think I can measure the base circle accurately, but by spanning a lobe with some calipers and turning the cam while looking for minimum dimension, I can measure down to 1.054 inches (26.7716 mm). I don't have the equipment to measure true minimum radius, so hopefully my crude method helps make some sense.

I tried the duration a bunch of times yesterday, but again, I just don't have the equipment to do it right.

Do you know who makes this thing? What's that AE2 between 1 and 2?

-g