i was able to get a hold of a 2 liter motor equipped with the "rare"1054803200051 cams but haven't had a chance to run it as of yet.
what type of application is best suited for such type of a cam? daily driver, racing, rally or...? what is the lift and duration of the cam? unfortunately, i can't get a hold of the previous owner or the engine builder since it's been awhile back.
Bebji: They are street, daily drivers. These are profiled on my website. Scroll down the "How To" link a bit till you get to cam stuff
ABout the rroad results I posted, ive got the cam timing info:
Timing was 106degrees LC for inlet and 112 LC for exhaust. LSeperation=109.
With the above & engine components, might I suggest:
The exhaust setting is currently the worst damaging factor to performance, but why was it set there? Valve clearance on Paul`s pistons??
Before setting them. First retard the exhaust cam as far as you can using a
.075 thick plastic wire tie between V&P. That is the point where you can feel the tie interfering, but you can still roll the motor through. That is as far
as it can be retarded. That point also should be the setting for the cam if you were to want upper RPM performance more than a good torque curve. (Torque wins races, HP sells cars).
If the exhaust can
clear the valves at (say) 100 degrees, then 102 is enough I would think on the exhaust. Not that you won`t try 100
But don`t say I havent warned you about Valve float at high rpm with clearance at the minimum. The piston is chasing the valve closed. A little float (missed shift or selecting the wrong gear) and you have the repair kiss!
Intakes are not so critical as the valve is following the piston down, but it does not need to be set at the minimum (.050 intake) except where valve cutouts are inadequate.
Intake:, this side you can start at 104 or go to 102 straight off. The less overlap that leaves you happy
is best as torque will be better. I will be traveling & will chech periodically to see if you had good results.
The JK303 is pretty close to my #136 that Ed is playing with on his car (Alfaparticle), except it (the 303) is not as fast lift, and above .350 it has less duration when the valves are flowing best.
What will you use as an exhaust cam? Your C&B 12 mm should be reasonable.
COLOR="Red"]As you move & change cams be sure to check Piston/valve clearance.
Alfaparticle`s testing might be worth an email to him. Ed is very knowledgeable, although he has a spot of difficulty speaking our language.
He types it well however!
Note that I said "our" language. He`s a bit Briddish![/COLOR]