[DeTomaso] 8500 RPM with hydrauilic roller lifters!

[Daniel C Jones]

I got a chance to read the PHR article on high RPM hydraulic roller
valvetrain.  It appears to be an advertisement for Crane's link bar
hydraulic roller lifters.  Unfortunately, there was no before and
after with OEM style hydraulic roller lifters so it's difficult to say
how much of the RPM is due to the lifters.  For many years, a friend
of mine ran one of the fastest and highest revving hydraulic roller
normally aspirated 5.0L-based EFI small block Fords.  He was a guinea
pig for Anderson Ford Motorsports in the  development of AFM's high
rev series of hydraulic roller cams.  All of his combinations were
tuned and dyno tested on AFM's Dynojet chassis dyno. If you poke
around Marc's website:

 http://www.the-arnolds.net/Cobra/index.htm
 http://www.the-arnolds.net/Cobra/run184vs201.jpg

you can see the progression of his 1993 Mustang Cobra from street car
to low 9 second drag car.  He started with OEM Ford hydraulic roller
lifters and steel valves then switched to Crane link bars and later to
titanium valves with progessively more cam and stiffer springs.  With
titanium valves, he turned 8800 RPM.  Prior to that I think he was
turning 8200 RPM or so with steel valves and titanium retainers.  I
showed him the PHR article and he thought it was old news but was
surprised that anyone would try it with 5/16" pushrods.  When I was
mocking up the hydraulic roller cam for the 351C dyno mule, I borrowed
a set of marc's old Crane link bar lifters.  After a couple of seasons
of 1/4 miles sprints, they were pretty well hammered and needed to be
replaced.

Dan Jones

On Sat, Jan 4, 2014 at 9:30 PM, Daniel C Jones
<daniel.c.jones2 at gmail.com> wrote:
>> I would love to hear opinions (especially from the illustrious Dan Jones)
>> weighing in on the Feb 2014 Car Craft article claiming the new Crane
>> hydraulic roller lifters will reach 8500 RPM with SS valves, titanium
>> retainers and 5/16 pushrods!
>
> I've not seen that article. I checked for PHR on the grocery magazine
> rack and while they did have the latest issue of Zombies magazine, PHR
> was no where to be found.  If you can scan and forward it, I'll take a
> look.  I did notice on the PHR website that Crane recently signed on
> for contigency money for top place finishers in the Engine Masters
> running their hydraulic roller lifters.
>
> For many years a good friend of mine ran the fastest, highest revving,
> normally aspirated, hydraulic roller, SBF foxbody Mustang.  He's moved
> on to solid roller cams but you can see what it takes to turn 8800 RPM
> (floating at that point) with a hydraulic roller here:
>
>  http://www.the-arnolds.net/Cobra/
>
> Poke around "recent updates".  In short, a tailored ramp rate cam,
> solid roller springs, titanium valves, Crane hydraulic roller lifters,
> etc.  Seats were taking a pounding at that point.
>
> Dan Jones
>
> On Thu, Jan 2, 2014 at 7:27 PM, dave londry <davel at emspace.com> wrote:
>> Nothing to say about the cam,
>> the valves might be OK,
>> nothing to say about the retainers,
>> didn't hear about the spring pressures,
>> the lifters must be magic
>> and the 5/16 pushrods are pure BS if they're made of steel
>> (and not some kind of unobtanium carbide)
>> dave
>>
>>
>> On 01/01/2014 11:47 PM, doug351c wrote:
>>>
>>> I would love to hear opinions (especially from the illustrious Dan Jones)
>>> weighing in on the Feb 2014 Car Craft article claiming the new Crane
>>> hydrauilic roller lifters will reach 8500 RPM with SS valves, titanium
>>> retainers and 5/16 pushrods!
>>>
>>> Doug Braun
>>> blue 73L #5505
>>>
>>>
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