anyone tryed hotrockers

[David & Cheryl Haggard]

   Supposedly, Dyno2000 automagically takes the lift into consideration as
it affects overall duration, but not sure how it does that. I have, though,
entered in some real-life engines with real-life head flow data, and seen
how it predicts the changes with different rocker ratios. Seems to be pretty
accurate. Once your lift is already optimum for the heads' flow, though,
little is to be gained at either low or high end by varying the rocker
ratio, unless the cam is very stock or very radical (from what I have seen).
   From what I saw on the Hotrockers website, they looked to me like they
are still a friction-fulcrum design. Roller tips, but the fulcrum is
friction. From that I wonder if they can give any advantage over a rull
roller rocker's friction reduction.
   Interesting to look at, and fore SOME engines, certainly something to
consider.

Dave

> -----Original Message-----
> From: owner-gmecm at diy-efi.org
> [mailto:owner-gmecm at diy-efi.org]On Behalf
> Of Eric Bryant
> Sent: Thursday, June 21, 2001 1:54 PM
> To: 'gmecm at diy-efi.org'
> Subject: RE: anyone tryed hotrockers
>
>
> Seeing as how higher-ratio rockers also change the duration
> (especially as
> measured at lower numbers, like 0.002" or 0.006"), maybe that
> needs to be
> included in the changes that you're inputing into Desktop
> Dyno.  I can't
> tell you how to calculate those changes, though.
>
> Seems to me that such a system would be of limited use.  I'm
> not sure why
> one wouldn't want to run the higher ratio all the time, since
> it doesn't
> really affect velocity in an adverse fashion.  I'm with you -
> I'd rather
> sink the money into other parts.
>
> Kinda a neat idea, though.
>
> Eric Bryant
> mailto:bryante at ghsp.com <mailto:bryante at ghsp.com>
> http://www.novagate.com/~bryante <http://www.novagate.com/~bryante>
>
> -----Original Message-----
> From: David & Cheryl Haggard [mailto:david at newcovenant.com]
> Sent: Wednesday, June 20, 2001 3:44 PM
> To: gmecm at diy-efi.org
> Subject: RE: anyone tryed hotrockers
>
>
>     Nuttin' wrong with being a newbie. We all were once. I
> think I still am.
>     I'd like to see Jim McFarland's article on this, before I passed
> judgment. However, running some quick Dyno2000 sims on my
> build doesn't look
> promising. But the Hotrockers website does throw the caveat that your
> engine's heads must be such that they will respond to higher
> lift. The flow
> tests on my heads indicate that for my power range and
> camshaft, more or
> less lift gives minimal return.
>     Articles in Car Craft, Hot Rod, and others confirm this.
> Not all engines
> respond dramatically to changes of rocker ratio. Others do. Until the
> Hotrockers maker comes up with some sort of guide to help you
> tell ahead of
> time whether they will help your engine or not, I'd sink my
> 930 bucks into
> other parts.
>
> Dave Haggard
>    1988 Formula Firebird
>    305 2 X 2-bbl CFI (under construction)
>    http://www.newcovenant.com/firebird/
> <http://www.newcovenant.com/firebird/>
>
>
> -----Original Message-----
> From: owner-gmecm at diy-efi.org
[mailto:owner-gmecm at diy-efi.org]On Behalf Of
HitManSmurf at aol.com
Sent: Monday, June 18, 2001 10:55 PM
To: gmecm at diy-efi.org
Subject: anyone tryed hotrockers


Click here: HOTROCKER! <http://www.hotrocker.com/>  there somewhat like v v
t but uses pushrods i think
it looks like a great idea .hate to be a newbie but just want to contribute

   the hitman

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