Justpunchit
NAXJA Member #1291
- Location
- Jaffrey, NH
i was just woundering if anyone has found roller rockers for the 4.0 HO i searched and i really didnt find anything... and I've tried all the big names company's and they have nothing. any ideas?
LilRedRover said:if you're putting these on a stroked 4.0 you may see better results than some of these guys are telling you, but they are correct in that more performance mods, you HP will increase exponentially with RRs
5-90 said:Exponentially? No. Tangibly? Certainly.
While the rollerised rockers will serve to reduce parasitic drag at the interfaces between the valve tip and the rocker tip, and should also have a roller bearing to reduce friction at the pivot point, I'd hesitate to call the benefit "exponential." That's the sort of thing you get from forcing an additional two atmospheres into the engine.
Even with the stroker engine, you may or may not notice the fact of the increase, except by the old "butt dyno" readings.
As mentioned, RR's are usually more for engines that run at high RPM, and/or high-endurance engines. I'd like to see roller lifters for us tho - not for the friction reduction, but because they allow the use of more aggressive camshafts - which could seriously improve breathing...
5-90
I'd love to see a picture of that car!.........Hansnosigma said:The Harland Sharps do not require a valve cover spacer. I have them on my triple 45 DCOE Rambler. They were worth every penny on that motor but it turns out ~300 hp, revs fast, was heavily ported,flow benched, big valves and has a custom cut cam.
I would never put them in my Cherokee which I use just for off road. Not worth it on a stump puller.
John
nosigma said:The Harland Sharps do not require a valve cover spacer. I have them on my triple 45 DCOE Rambler. They were worth every penny on that motor but it turns out ~300 hp, revs fast, was heavily ported,flow benched, big valves and has a custom cut cam.
I would never put them in my Cherokee which I use just for off road. Not worth it on a stump puller.
John