Alan,
If you measure duration @ .050 lift at the valve, duration figures do change
just as total lift at the valve changes. Duration @ 0 lift (essentially
duration at the cam)
does remain the same. Sorry for the confusion.....
Frank
> -----Original Message-----
> From: Mok, Alan (SPB Brentwood) [SMTP:AMok@spbank.com]
> Sent: Thursday, October 15, 1998 7:54 AM
> To: dakota-truck@buffnet.net
> Subject: DML: RE: Re: RE: rocker arms --ATTN. Frank Holloway
>
> I suspect that the increase ratio of the rocker arms will make the
> valves open/close faster (ramp rate?) and open further given the same
> cam. The valves will still be completely open or shut at the same time
> regardless.
>
> Alan
>
>
> '98 Dakota R/T (Headers, FABM & waiting for Shift kit)
> '89 Mustang GT (347, Griggs, S-trim...)
> Ducati 916 (someday)
>
>
>
> -----Original Message-----
> From: Tim [mailto:magnum318@bewellnet.com]
> Sent: Tuesday, October 13, 1998 11:17 AM
> To: dakota-truck@buffnet.net
> Subject: DML: Re: RE: rocker arms --ATTN. Frank
> Holloway
>
>
> From: Tim Roller>magnum318@mail.bwn.net
> wed.11:08pm
>
> >>Frank--you mentioned that 1.7's gave more lift and
> duration. I understand
> the lift, BUT more duration? How is that possible--the
> cam grind determines
> what the duration is --Does the rocker change offset to
> the cam and make
> the valves hold open longer ? That's a new one on me,
> from all the engines I
> used to rebuild--that Would save a lot of money and time
> from changing out
> the cams to wilder grinds.
>
> -----Original Message-----
> From: Holloway,Frank T <Frank.T.Holloway@KP.ORG>
> To: 'dakota-truck@buffnet.net'
> <dakota-truck@buffnet.net>
> Date: Wednesday, October 14, 1998 9:48 AM
> Subject: DML: RE: rocker arms
>
>
> >Bill,
> >Factory rocker arm ratio is 1.6 I use the Crane roller
> rockers and I am
> >happy with them. If you want a higher ratio, Try
> Crower, they have a 1.7
> >(easier way to get
> >more lift and duration with the factory cam)....
> > Frank
> >
> >> -----Original Message-----
> >> From: William Blount Arthur
> [SMTP:m990198@nadn.navy.mil]
> >> Sent: Tuesday, October 13, 1998 9:56 PM
> >> To: dakota mailing list
> >> Subject: DML: rocker arms
> >>
> >> Do any of ya'll know what the stock rocker ratio is?
> Also, why wouldnt
> >> any roller rockers work on our trucks, we dont have
> shaft rockers as far
> >> as I know. If any of you have replaced the rocker
> arms with rollerized
> >> ones, do you like it and is it worth the $? Thanks.
> >>
> >> Bill
> >> '97 SS/T
> >
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