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 Post subject: Cam Timing Tech Info
PostPosted: Wed Apr 24, 2013 8:19 pm 
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Joined: Tue Sep 02, 2008 9:35 pm
Posts: 791
Car(s): IPRA G180 TX coupe, TURBO TX COUPE
I thought I would post this up as there have been lots of questions regarding cam timing recently.
If any one wants to know more PM me and I will try to help, im not an expert engine builder and I am still learning.

Regards

Morgan
link to an ozgemini topic: http://www.ozgemini.com/forums/non-tech ... p?p=222987

I took some photo's of my cam timing set up on my race car engine.
G180z bored out to 2.0lt 9.7:1 compression ratio, flat top pistons with custom fly cuts (Miltons) Mild Crow cam, Alloy rockers and adjustable cam gear.

-First one is the crank marker on top dead center (locks it in place)
-Cam gear adjusted to the crow specs sheet
-Showing how far the cam has been advanced (about 5 degrees out?????)to get the correct inlet lift at Crank TDC
-Dial guage showing 1.9mm (0.077 thou) lift on inlet valve at Crank TDC (ignore the reading as it was set at 5.0mm then the guage drops to 3.1mm)
-Fly cuts (3mm deep)
-Showing interferance with playdoh (leaving about 1 to 1.5mm gap)

So that's the process I went through to time the cam gear to the crank, as far as I can tell it's right. ---
If I had timed the cam with a standard gear and put it back in to factory specs I would presume that the car would NOT run as well as it should right? which would explain a few gems that make much less power than they should considering the carby and cam combinations that they run.?

Any more info would be appreciated, as this is still my first engine built that I have attempted to do everything with out guess work.


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