Cam Timing, Is this correct?

[db484bhpv8]

Currently checking the cam timing on the newly installed Tornado cam.

Heres the spec



I set TDC with the dead stop method so am happy with that.
The JP timing gear was installed on the zero keyway.
A new dial gauge has been set to the top of the inlet retainer.
I turned the engine clockwise till the dial gauge reached top ie reversal point and set to zero.
The engine was backed off .1 then back clockwise to 0.05 and i recorded 80 degrees ATDC, carried on past the zero to 0.05 again and recorded 148 ATDC. So add the 2 together = 228 dived by 2 = 114

So it seems the timing is out by 4 degrees retarded.

Correct?

[Pumaracing]

Struth. 50 thou either side of full lift?? A couple of thou either side of full lift and split the difference is plenty. Otherwise you seem to be correct.

[db484bhpv8]

Pumaracing said:

Struth. 50 thou either side of full lift?? A couple of thou either side of full lift and split the difference is plenty. Otherwise you seem to be correct.

was checked at 5 thou

[Pumaracing]

0.05" as you stated is 50 thou not 5 thou. 0.005" is 5 thou. Anyway normally at a check measurement of a couple of thou you get 20 or so degrees between the start and end of the degree interval to split.

[db484bhpv8]

Pumaracing said:

0.05" as you stated is 50 thou not 5 thou. 0.005" is 5 thou. Anyway normally at a check measurement of a couple of thou you get 20 or so degrees between the start and end of the degree interval to split.

So i did. Was a typo.

[db484bhpv8]

The JP gear did the trick. Now on the 4 degree advance keyway.
Rechecked and blob on 110 degrees.

Currently setting the pre-loads with my new adjustable push rods.

What pre load is recommended on the crane lifters?

[Pumaracing]

I would only add that most cams run best at 2-3 degrees advanced over the nominal lobe separation angle. So for your 110 degree grind you might want to try 107-108 full lift on the inlet lobe. Only a dyno test will tell of course but 30 years of experience tells me that you get a better spread of low rpm vs high rpm power with that few degrees of advance.