Lancia Camshafts Specs

[KOSTAS XENAKOS]

Hello Guy.

You should be the only person that I know right now to give me a correct answer on what I'm looking for.

I'm looking for the specs of the camshafts of Lancia 2.0lt 16 valve and 8 valve Turbo engines, Duration (degrees) and valve lift (mm), for the inlet and outlet camshafts. I looked in every technical book, but no luck...

I hope in your help!


Thank you for your time,

Kostas.

[Guy Croft]

Factory figures:

Int 8v
in cam 8/42
ex cam 42/1
Lift 9.1 in 8.6 ex

Int 16v
in cam 8/35
ex cam 39/0
Lift in 8.6 ex 7.5

The lifts are 'nominal' . For true (valve) lift subtract running clearances of 0.40mm in and 0.45mm ex

The factory timing figures are quote with a WIDE running clearance of 0.8mm which gives the impression that the cam duration is very short eg 8v inlet duration 8+42+190 = 230 deg. Installed and set with 0.4mm running clearance the true duration is going to be nearer 270 deg but I am unable to give you those figures. However that is not overly important. The main thing is to set up the cams properly at their repsective full lift positions (FL) which are easily calculated:

Cam timing figures – what they mean

Typical competition cam example:
Quoted timing 40/80 80/40. These degree figures are crank degrees and mean the following:

Inlet opens 40 crank deg before tdc and closes 80 after bdc
Ex opens 80 crank deg before bdc and closes 40 after tdc
Overlap is sum of 40 + 40 = 80 crank degrees
Duration of both cams is 40 + 80 + 180 = 300 crank deg
Full lift (FL) is at (300/2) – 40 = 110 crank deg.
Thus inlet FL is 110 deg after tdc, ex is full lift 110 deg before tdc.

The duration with actual running clearance can easily be measured with a protractor and dti once the cams are installed and shimmed up.

I hope this is helpful,

GC

[KOSTAS XENAKOS]

Very helpful indeed!!

Using the "wide" running clearance of 0.8mm, brings us closer to the factory cams of 8 valve Integrale engine. It is known that they use "small" camshafts around the 210 and 230 degrees, but no one could figure out the exact numbers, and the 16 valve engine is also close to these numbers as I can see (about 5 degrees difference).

Finding out those things requires knowledge, and you have plenty of it sharing with us.


Thanks again Guy.



Kostas.