Robots are the replacements for Policemen

Robots = Traffic Lights

Honestly it would help alot if we knew the lift & duration on this camshaft. It would save alot of confusion & guess work.

"This means that the inlet valve opens 30 degrees of crankshaft rotation before TDC, then closes 72 degrees after BDC"


Incorrect !!!!!!!!!!!!!

the intake opens at 30 degrees before TDC.

the exhaust opens at 70 degrees before BDC.

Sorry Datsik but you are incorrect on this one.

Camshafts are often known by the inlet component of their nominal timing (valve on seat to valve on seat). This is also often called the advertised duration.

A much more accurate form of timing is timing at either 1 mm or 1.25mm (0.040" or 0.050")lift. In this figure the valve is off the seat a set distance that can be measured accurately.

It is just easier to refer to cams as 30/70 or 35/75 etc. These 30/70 numbers mean the inlet opens 30 degrees before TDC and inlet shuts 70 degrees afer BDC. The numbers refer to the nominal inlet duration, with the exhaust timing being similar but maybe retarded 5 degrees.

So a 30/70 cam has a nominal 280 degrees duration and a 35/75 cam a nominal 290 degrees duration.
These would have approx 235 and 245 degrees duration at 0.040" lift.

As there is no standard for cam grinders to use they tend to invent their own lift measurement standards to remove timing lift comparisons.

One thing most cam grinders will not quote is the maximum rate of lift change (accelleration) per cam rotation degree. This is the most important consideration in cam design for a competition engine, and also where the maximum rate changes occur.

Haha, okay, in south-africa we talk diffrently.
Cable.T i know. But i'l only be able 2 give it on wednesday . Guess work... i Can ask you though : Should a Mild cam kill one's Idle'ing ? The Engine starts to idle fine at 900 rpm. And then It sounds like its flooding it'selt till it spits and flutters to 'death'

Yeh Feral, I think you're right!!!!
As I was typing it in....it didn't make any sense to me as it doesn't really give any usefull information about the cam......My information comes from a magazine..

quote : ".......has reached top dead centre(30/70 cam - means 30 for intake, 70 for exhaust) the inlet valve begins to open......." unquote

The article is confusing because in it (apart from the quoted words), the inlet opens at 30 BTC, closes at 70ABDC, the exhaust opens at 70 BBDC and closes at 30 ATDC!!!!

Thats why I figure that the 70 is referring to the exhaust side.

Quote:Sound like a choke problem, or some other problem with the carburetor. If it runs fine for a few seconds, then it's almost certainly not the camshaft. Did it run the same way with the old cam? If not, maybe the mechanic did not connect up the hoses the same way, there could be a vacuum leak.

Okay great. I think i should start Checking for Vacuum leaks and diffrent Choke Size's, But this Can't be because the cam's timing is out with a Tooth or 2 on the Pully Gear ?

if the cams timing is out, then the car would be hard to start in the first place and not run well at idle at all. if it runs fine but then starts to die, i too would to say that its the carby.

Okay, I changed my 36/36 dcd 7, for a 32/36 dgav. Problem Solved Kind-of. Guess it was vacuum leakage. So in theory the cam with the carb and manifold won't do ALL that ?