travis91

I am hoping the issue is a lean condition since I didn't change the jetting after swapping the cam. I have jetted the car up several jet sizes and moved the timing back to 36 and will see how she does this weekend at the track. The balancer is accurate and I did verify TDC when installing and degreeing cam. The spark plugs are autolite ar133's. Same plugs and gap as before. After I get this thing running properly with the new cam, then I will get a new converter that is built for the combo from FTI. I need to find out at what rpm the engine falls off before I decide on a gear change. I will let you guys know if the added fuel fixes the issue.

cepx111

Racing this weekend huh?

Where do you live Florida?> :shock: :lol: :lol:

travis91

That's right, Gainesville, FL. Home of the Gators and the Gator Nationals. It is great when the track only closes for one month out of the year. Of course, the downside to that is the fact that you have to rush to do your rebuilds or updates so your not sitting around while other people are having fun.

Tod74

We are supposed to get 8" of snow tomorrow...


P.S.
I hope you get a sunburn.

travis91

I am guessing the guy at the track last weekend running his snowmobile didn't hear about your snow. I guess he is just another snowbird trapped in Florida. If I see him this weekend, I will let him know. Better yet, I will borrow it and come visit. He was running 10.20's at 128 on that sled.

cepx111

:shock: :shock: :shock: Now that's scary fast for a snowmobile!

travis91

The added fuel did not help and may have made it worse. I did verify it is not losing fuel pressure. It did cut the best 60 foot ever though of 1.397 but fell on its face at 100 feet. It feels like it is losing several cylinders. The last run I couldn't even get it to rev up to stahl on the brake at 4000 rpm before it started breaking up. I guess my next move is to change the plugs. I currently have ar133 plugs. I have to run the shortest plug possible because of a header clearance issue. What plugs do you guys use? The car does seem like it has an erratic idle since replacing the cam. I just figured that it was the added duration but now I am not so sure. I guess if the plugs don't fix the issue, I will have to test the msd and coil and see if there is a problem there.

radicalz

I had bad luck with autolites....they are a great replacement for the street but performance wise...not so much....get some NGK's or AC's in might help you with the break up thing...as far as falling on its face @ 100feet...that sounds like a fuel restriction someplace....what is your fuel pressure when @ idle...or when going down the track glance at the fuel pressure gauge and see where it is at...I bet it is falling off about then....

TheYellaBrick

Maybe you are running the float bowls dry, falls on it's face then refills then runs good again.

travis91

It is not a fuel problem. Fuel pressure is 6.25 psi and constant. When I said falling on its face, I mean it starts breaking up to the point where it sounds like your going to lose some parts and is losing power like it is dropping cylinders. Since it is just under 12-1 compression and I am running 110 vp fuel, I know it is not detonation. The reason for using the autolite racing plugs is because they are short and do not have a projected tip. I have 2 plug wires that touch the headers even with these short plugs. I have those two wires wrapped with protective heat shields so they dont melt the boots. The other reason is that with the projected tip plugs, the pistons have a tendency to close the gap on them. I am going to try a hotter plug and new wires and coil to see if that fixes the problem.