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914World.com _ 914World Garage _ Cam

Posted by: trojanhorsepower Nov 12 2003, 10:05 AM

Hi guys and gals

Can any body tell me what cam this is i.e. performance stock. I have read the Weber thread and the stock number don't seem to match the numbers that I have. I could not find a web page for eagle cams, and CB did not list this item #.

It does not really matter since I am stuck with this cam, but it might help me tune the motor (if it ever runs!).

Thanks again

-Pete

Attached image(s)

Posted by: 2teeners Nov 12 2003, 10:09 AM

I bought one similar at cbperformance.com looks like their version of the stock cam

here's all their cams for type iv's

http://www.cbperformance.com/catalog.asp?ProductID=69

I'm wondering, though if it's a carb stock cam. i recall the fi cam has very little overlap (5degrees or so) anybody confirm or deny this?

Posted by: 2teeners Nov 12 2003, 08:27 PM

pulled this from the pelican site archives. your cam seems much more agressive than this stock spec calls out. Slightly less duration than a webcam 73 but less lift.

"
Haynes says that the stock cam specs are as follows:
intake open @ 12 deg btdc
closes @ 42 abdc for duration of 234 deg
exh open @43 bbdc
closes @ 4 atdc for duration of 227 deg

valve lift is .385"

Posted by: trojanhorsepower Nov 13 2003, 08:26 PM

CRAP!

How bad is that going to screw with my stock FI??

-Pete

Posted by: Aaron Cox Nov 13 2003, 08:37 PM

sounds like a carb cam

Posted by: trojanhorsepower Nov 13 2003, 08:49 PM

Shit I hope not!

I know that the PO bought it with the intention of putting the factory FI back on, so unless some one sold him the completely wrong cam (very possible) it should be atleast an FI cam.

But who knows. I guess I will just have to wait till I try to fire it up.

-Pete

Posted by: 2teeners Nov 14 2003, 03:21 AM

Well, if the webcam 73 is a hotter FI cam, and this is milder than that, It can't be too bad.

I bought the hotter carb cam, but have decided not to build that motor. I wish I'd have bought one like yours for my plans involving FI.

Posted by: trojanhorsepower Nov 14 2003, 09:06 PM

That's a big relief!
Thanks for all your effort 2teener.

-Pete

Posted by: DuckRyder Nov 14 2003, 10:09 PM

Its right there on CB's webpage: 2199 =

2199 Stock duration & lift T-2 and 914 camshaft. Fits all VW and Porsche 1700, 1800, & 2 liter engines, exact replacement for factory cam. $99.95

Sounds like it should work fine.

Posted by: DuckRyder Nov 14 2003, 10:14 PM

P.S.

That is about the lamest cam card I ever saw. Crane would close its doors before it turned something that abstract out.

God only knows what it is speced at: .006, .004. .050, mm, inches, anyone got a crystal ball to read their mind?

One could assume the specs are at the indicated lash, but it does not actually say that.

GFL degreeing it.

Posted by: 2teeners Nov 15 2003, 10:36 AM

i went in to order a cam and was stumped by all this, so i did a little further research to find the answer, and here's what I found.

from a post here-

I emailed Web Cam recently and asked them for the specs on their replacement for the stock 914 camshaft and they replied:

"These are the specs on the stock cam:

.302 @ the cam on the intake ( 7.67 mm)
.283 @ the cam on the exhaust ( 7.19 mm)

Duration @ .050 intake is 210°
Duration @ .050 intake is 206°

Intake opens -3°
Intake closes 33°

exhaust opens 31°
exhaust closes -5° "

You also have to consider the rocker arm ratio.---

I found another post which said Porsche specs are measured at .040, not .050. That's what the Haynes manual calls out, so the numbers are different, but in line.

the yellow card from your pic calls out duration which is measured at 0 lift, so that could align as well.

so we're dealing with three different ways of cam measurement, that's where the confusion comes in.

It would appear you have close to a regular fi cam. and the hotter webcam 73 for comparison is out at 224deg. duration.

I feel better now.