What is the proper cam I should be running? I was told at a local Dyno shop that my cam is causing me problems: backfiring on occasion under 2500 rpms I am currently running:
462 210 110 @050 i believe that is the way it reads
472 215
Here is what was done at the Machine Shop:
Line Hone block
Cam
Springs
polich crankshaft
performance valve job? (what ever that is)
resurface heads
match port intake ports
1.6 Compcams rockers
Hi volume oil pump
there is a lot to consider when running the right cam in your engnie. are you using an automatic or manual transmission? whats your rear end gearing if you have an auto? what size is the engine? what is the compression ratio? get back with this info and i'll be able to help out
Hey there, I just got off the phone with Comp Cams and they say it is highly unlikely that the cam would be your problem. I mean, on the grand scale of things, this cam is pretty tame, the stock ECU should be able to use it easily. What they reccomend, and I as well, is checking your rockers. If they were put on too tight, it would cause some of the valves to stay open longer than they should. next you want to check and see if the crank and cam are dialed in correctly or in sync. It isnt likely that the electronic ignition would be misfiring, i havent really heard of a case for that.
if all that fails, they say the cam they would reccomend is something around the same lift, with a 212 duration on the intake and 218 duration on the exhaust, with a 112 lobe seperation angle. Check all this stuff out, then give a shout back to see how you're doing.
Unless the cam lobe(s) went flat (in other words is ruined during break in) or the camshaft is phased completely off (which I doubt) it's not the cam. Check you lash and cut your filter open and look for debris. Otherwise I'd suspect ignition problems, as I have seen 98% of the time on the dyno (my own dyno that is).
If lash was incorrect to begin with that would also be a problem. I would never let an engine off the dyno with a miss like that. We always will resolve prior to taking it off. That's what the dyno is for.
Thats a baby cam, even for a stock LT1, I am with the others here. I think you need to re-check the valve lash...
Also, have you had any programing done??? Is it backfiring out the exhaust or the intake? You might be getting a little bit of reversion in the exhaust caused by the camshaft, which is screweing with the oxigen sensor, and you could be just in need of more/some tuning.
Brian Hobaugh SCCA National Tour June 2014
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