Hey guys ive finished doing my cam install and my car is making a weird noise. After i got done putting it together i cranked the car over about 10 times before starting (hoping to prime the oil pump) I then started the car and oil preasure jumped to 40 psi almost imediately. i heat cycled the springs and then i went for a test drive. while on the drive at about 2500 rpm it started making a ticking noise almost like a sewing machine it would increase and decrease with rpm so i immediately checked my oil preasue and it was at about 45-50 at 2500-3000 rpm so i took it home and at idle the noise goes away and it wont come back till about 2000 rpm. Does this sound like a spun rod bearing or a lifter/valvetrain noise? when i pop the hood and listen to it it does not sound deep or like a knock and the noise is only coming from the drivers side. Any help or suggestions would be appreciated and if anybody has spun a rod bearing what does is sound like? Also i will be draining the oil to look for metal shavings and i am going to pull the valve cover off tomorw to have a looksee

 

Also as far as the install background, I put a new ls6 oil pump on rollmaster timing chain and gears g5x3 on 112 lsa prc platinum duals w/comp hardened locks and 7.4 hardened push rods new seals and gaskets etc...

 

I have read about this before on here. It sounds to me like it is valvetrain noise. I think if you had a rod bearing gone, you would hear it knock, not sound like a sewing machine.

 

Did you verify pushrod length before turning motor over to run??

 

sounds like my car with a exhaust leak off the header

 

The G5X3 on a 112 requires fly-cutting the pistons.

 

If thats the case you have some issues. Are you sure about that LS69TA?

 

the g5x3 on 112 does not require fly cutting the pistons its proven in many cars that it does clear as long as the heads are not milled as far as push rod legnth they are 7.4 which was reccomended to me by lou at lg motorsports

 

Then why did L.G. tell me that I would have to cut mine to be on the safe side? The PTV clearance was too close for comfort. One missed shift and you're done. I sold my G5X3 on a 112 b/c of what they told me. It was going to go in a stock 02 LS1.

 

Thats not exactly true. Spun a rod bearing about a month ago & it sounded just like a bad lifter or a loose rocker arm. It wasnt barely spun either it grinded down the crank .018 so it was trashed.


I would recheck all the rocker arms 1st. Start with the simple stuff 1st, then look for a header leak, then maybe a plug wire arching on the header or off the coil pack. Also everything ive read said the G5x3 will clear stock heads.

 

Hey man try this take the valve covers off and swap the rocker arm closest to the firewall and the one closest to the radiator and swap them with the two rocker arms in the very center of the motor and then work your way out to the edge of the motor and then do this on the other side of the motor.This is a little hard to explain if you need to now more about what I am saying pm me.

 

If I remember right, the G5X3 112 has like .055" PTV or something like that. The 114 lsa clears by a safe margin, but the 112 was too close for comfort. Flycutting the pistons was recommended, so I swapped to a FM-15.

 

https://ls1tech.com/forums/showthrea...light=g5x3+112

 

Fly cutting is an option, but it does clear not by much but it does. I guess thats what I was trying to get at. It is a very good possibility that he is having PtoV clearance issues. I would pull that cam, maybe try a different one to see if the noise is still there. Or worst comes to worst you could always pull the heads to see if the valves are hitting. Thats what happened with my FM13, I spun a rod bearing, causing the piston to rise more than its suppose to resulting with a little contact between the valve & piston. It wasnt much but it made an awfull tapping noise.