1.7s require mopar covers, or knock the oil baffles out of your
stock covers. I have pricing on those, as well as 1.7s... email
directly if you are interested.
Sam '00 RT
> -----Original Message-----
> From: owner-dakota-truck@buffnet.net
> [mailto:owner-dakota-truck@buffnet.net]On Behalf Of Matt Schroeder
> Sent: Wednesday, August 02, 2000 9:03 AM
> To: dakota-truck@buffnet.net
> Subject: DML: Re: Roller Rockers
>
>
> Harland Sharps website claims that their "...unique Friction Free
> Design has
> shown average performance gains of 15 to 40 horsepower." Maybe so.
>
> The higher number ratio opens the valves quicker and slightly
> farther making
> your stock cam act like a more performance oriented cam.
>
> I believe in the 2000 engines that the factory ratios were
> already 1.6 so to
> go up you'd need 1.7's
>
> Basically the fulcrum point gets moved closer to the push rod end of the
> rocker making the valve tip end of the rocker move quicker and
> farther than
> before.
>
> It works to help any engine, not just supercharged engines. The needle
> bearings in the fulcrum also help some in saving wasted
> mechanical power and
> some manufacturers claim it lowers oil temperatures as well.
>
> It also keeps your valve system more dimensionally consistent in it's
> operation from valve to valve allowing the engine to operate more like it
> was designed to. Add that to the fact that the rollers and
> fulcrum bearings
> don't rob as much power as standard rockers and it could add up to a
> significant number of horsepower gains.
>
> Stock valve trains are the limiting factor in higher revving engines, due
> mainly to valve float from insufficient valve spring pressures and
> mechanical inefficiencies, and therefore roller rockers are almost always
> used, but your application won't likely have that problem.
>
> Another thought from some is the roller lifters themselves will limit your
> rpm capabilities to around 6250 simply because they are so heavy.
> They add
> a lot of inertia to the up and down opening and closing of the
> valves making
> valve accuracy a tough thing to come by.
>
> You can keep the same lifters and everything else if you like.
>
> One thing you should check is whether or not your valve covers still work
> with the new rocker arm setup. The others on this list would know that
> answer.
>
> Matt Schroeder
>
> ----- Original Message -----
> From: "Ronald Wong" <ron-wong@home.com>
> To: <dakota-truck@buffnet.net>
> Sent: Wednesday, August 02, 2000 9:19 AM
> Subject: DML: Roller Rockers
>
>
> > What are my advantages to changing my roller rockers? Is it more for
> those
> > that are opting for SC's? Performance gains? 1.5 is stock so I see in
> > MOPAR parts book that 1.6 is the option. Someone, please
> explain how this
> > ratio works....Bernd? Is there other parts that should be
> changed because
> > of this change? e.g., lifters? Cost vs gains? Thanks all.
> >
> > Ron
> > 00 SLT QC 4X2 5.9 3.55 LSD
> >
> >
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