Ok so I just rebuilt my engine biggest comp cam and .30 pistons new oil pump and sending unit head totally reworked timing set but now it seems like the thing is loading up on fuel or it has to much back pressure. When I rap out in third the engine wants to bog out and backfire any ideas on what this could be. I'm running 93 octane in it as we'll. please help
Back fire is in the intake or pre-combustion, afterfire is in the exhaust. The diagnosis and fixes differ for the two so the distinction can be important. The afterfire popping is usually an enriched condition.
For some, it is easier to kill the light inside of themselves than it is to fight the darkness all around them.
you also do understand the cam needs to be matched to the valves, lifters, rockers and valve springs, right? it's not like you just take the biggest cam you can find and shove it in the motor. sounds like that's exactly what he did. zero homework, buy some parts and jam it all together....
Lol. Sounds like the guy who threw a huge single plane intake and a double pumper carb and wonders why his car is a huge turd out of the hole.
When I called and spoke to the guys at comp cams I told them that the motor was bored 30 over and that I wanted to change nothing in the head. They told me that the cam they were going to sell me was gonna work fine with the stock head. That's the only reason why I agreed to order the one I did. I have the numbers for lift and duration maybe someone can tell me if it's still good for a stock head or not.
The intake valve is
The exhaust valve is
Lobe separation is
The head had all ew springs put in reground seated and the only things I didn't change were the push rods and the rockers. Other than that the machine shop did all the cleaning up of the head and put it all back together. Other than those two things.
The only cam remotely close is 68-232-4, and that has significantly higher valve lift and requires Mopar Performance valve springs. If you have that cam, you may have actually wrecked components of the valvetrain at this point. Lots of people burn up cams and lifters in no time flat with improper assembly....
Also, was the timing advanced when installing the cam? How did you go about installing the cam position sensor? Was the motor at TDC?
I guess I'm gonna have to get ahold of comp cams and make sure the numbers are right and make sure they sold me the right cam. I timed it as if it were a distributed motor Tdc and then positioned the oil pump as stated in the book and then set the cam position sensor back in with the plug facing the back of the jeep