OEM Cam Specs?

[Radim]

Been searching but haven't found anything looking for OEM cam specs to compare to aftermarket cams...

 

Sorry if this has been covered i couldn't find the information..

 

(Lift Duration ect...for an L16-18-20b

[datzenmike]

L20B:

 

Lobe lift 0.276"

Lift at valve 0.413"

Duration 248 degrees

 

Everybody measures it differently but here's the valve opening and closing sequence for the L20B cam starting at TDC compression stroke:

at 126 ATDC (or 54 degrees BBDC) exhaust opens.

at 344 degrees (or 16 degrees BTDC) intake opens

at 374 degrees (or 14 degrees ATDC) exhaust closes.

at 592 degrees (or 52 degrees ABDC) intake closes compression stroke continues for another 128 degrees to TDC or a total of 720 degrees or two full turns.

 

Valve overlap (intake and exhaust open together) 30 degrees

 

Naturally the valves only begin to open/close at these points in theory. Actually the valve clearance delays the opening and closes them early

[Radim]

Awesome thanks!

[ggzilla]

Everybody measures it differently

 

Yep. Which means you cannot compare those Nissan specs to specs from another manufacturer.

[Radim]

Hehe yeah, but atleast it gives me an rough idea which is good enough,

 

I was looking at the Isky Stg.1 wondering if it's worth a shot.

[datzenmike]

Many are measured at 0.050" lift.

[banzai510(hainz)]

Isky stag 1 is fine.

 

Remeber you should get new Rockers and buy the lash pads retainers ect.

 

PS just getting a cam and running a stock or Weber down draftcarb is mot going to give huge power results. Best with sidedrafts.

 

olddatsuns.com read there fisrt

[_chiefjt]

What are the specs for a stock z24 cam? Is it the same as the L20B?

[banzai510(hainz)]

webcamshafts.com has some cams

Z motor an L motor are totally different type of head set up

[datzenmike]

Will not interchange but similar specs.