HttpWayne
NAXJA Forum User
- Location
- Auburndale, FL
Yeah, what he said. RR's are supposed to be quieter. You might want to recheck your valve lash adjustments.
After some ponderance I have decided I'll probably never use RR's on the Jeep. The idea of the stamped steels flexing means they will absorb more shock in the valve train and produce less wear and tear on the cam and lifters in the long run. I just watched a video where they Dyno'd RR's that were 1.6 vs the stock 1.5 on a Chevy engine. They made 17hp and 2.5 Tq abot 6000 RPM on a 425 HP motor. Just not worth the money for small gains that add rigidity to the valve train and potentially reduce components' life time. I'm not concerned about valve tips. That's easier to work on than pulling the head to get the cam and lifters out. Parts will eventually dry up for the 4.0. In my search I am already seeing a lot less options out there, but Comp Cams will probably always have you covered since they don't just stock them and wait for them to go out of style, they're custom grinding mine and the cost of the cam was cheaper than just about everywhere, except the OEM on RA.
After some ponderance I have decided I'll probably never use RR's on the Jeep. The idea of the stamped steels flexing means they will absorb more shock in the valve train and produce less wear and tear on the cam and lifters in the long run. I just watched a video where they Dyno'd RR's that were 1.6 vs the stock 1.5 on a Chevy engine. They made 17hp and 2.5 Tq abot 6000 RPM on a 425 HP motor. Just not worth the money for small gains that add rigidity to the valve train and potentially reduce components' life time. I'm not concerned about valve tips. That's easier to work on than pulling the head to get the cam and lifters out. Parts will eventually dry up for the 4.0. In my search I am already seeing a lot less options out there, but Comp Cams will probably always have you covered since they don't just stock them and wait for them to go out of style, they're custom grinding mine and the cost of the cam was cheaper than just about everywhere, except the OEM on RA.