turbo SBC's... was RE: Thanks for the EFI! (off topic)

[elcamino73]

--- Original Message -----
From: "Mark S. Riley" <turbotuneusltd at triad.rr.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, December 17, 2001 9:34 AM
Subject: Re: turbo SBC's... was RE: Thanks for the EFI! (off topic)


> They were legal. Rollers never have been in the "CUP" series. Problem with
> mushroom lifter camshafts are that they don't last very long. If you put
an
> aggressive grind that will need valve spring to maintain control, then
> lifter and lobe life is very much shortened over "Normal" flat tappet cam
> grinds. Also the bottom of the block "must" be spotfaced to prevent one
> point of the lifter touching a casting tit or bump which breaks the foot
off
> the lifter. Perhaps lifter float cause you were trying to run the lightest
> springs to cut down on drag and wear. Then the driver does something
bright
> like turn it 9600 on a restart. Also they have to be shimmed front to rear
> against cam walk cause the opposite lobe will lift the wrong valve with
very
> little aft to fore movement. Used to see pallets of Crane, Competion Cams,
> Cam Dynamics, Reed, and Crower Cams mushrooms at some of the local "CUP"
> shops. They couldn't run a cam and lifter but once. Wouldn't make two
races.
> I use to buy the used cams and lifters and  run them in short track
engines.
> Valve action with a mushroom can be more radical than a roller ever
dreamed
> about. They just don't last long because of the loading. Oh, the lobes are
> thinner to help with the "crosslift problem" because of the big foot. The
> "CUP" stuff was cut for a 1" foot lifter. When Nascar outlawed the
mushroom,
> they all went to the ford lifter size, .850" I think. Precisioneering in
> Asheville, NC does most of the lifter boring and registering for the
teams.
> They have a factory type lifter boring machine.
> Duh, that's probably more than anyone would want to know about that "old"
> stuff. later, Mark

Sounds like exactly what I don't need more aggravation and maintiance.

> ----- Original Message -----
> From: "Shannen Durphey" <shannen at grolen.com>
> To: <diy_efi at diy-efi.org>
> Sent: Tuesday, December 15, 1998 10:44 PM
> Subject: Re: turbo SBC's... was RE: Thanks for the EFI! (off topic)
>
>
> > Greg Hermann wrote:
> >
> > > Don't know if they are still doing it for a "cheat", but I know some
> NASCAR
> > > guys were running mushrooms for a while. Rollers were against the
rules,
> > > and the tech check was to stick something down the pushrod hole to see
> if
> > > the lifters would rotate. Mushrooms rotate ! :-)
> > >
> > Last engine I saw had Ferd lifters.  It's been a few years.
> >
> > Mebbe them lifters is like the gauges, they is either open or close and
> nothing
> > in between. ; )
> > Shannen
> >
> > ----- End of forwarded message from owner-diy_efi at diy-efi.org -----
>
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