Re: Racer brown vrs ultradyne

[tom hecht <baddd65@xxxxxxxxx>]

my question is still this, were you running a 1.5/1.6
ratio set-up?
because if i can pick up 4 tenths by simply switching
sticks, i will do it. 

the racer brown website seems very clear on their
mixed rockers, and i dont have a couple hundred bucks
for additional rockers.

fyi, ultradyne told me because this cam is made for
1.5/1.5 the gain vs. the cost for 1.6 rockers
would not be worth it.

 i do appreciate your view even though i may come off
a little rough sometimes, i can still be taught.

tom
65 satellite




--- Don Dulmage <big-d@xxxxxxxxxxxx> wrote:
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> 
> 
> Ok you asked I will tell you. First ,more lift in an
> iron headed engine does not produce more power. ,
> Usually less. . 
> What makes you so sure, Don? you ask . (I can hear
> what your thinking)
> Well if you have been to my website you know I told
> you I tested everything  first so it is not opinion.
> I have run 23 cams in these motors . 
> I bought an untradyne 613 cam  after i had old
> reliable running strong. Our head flow was in the
> mid 280 for CFM  at 540 lift. We knew that head flow
> did not improve above that and in fact would go
> backwards above those figures  We knew we could port
> the heads so they would sustain lifts to 600 but
> they still wouldnt flow as much air as the real good
> heads did at 540. (Dvorak did a real good "honest"
> test of all heads in the 90s in Chrysler power
> magzine and it is one of the best  i have seen Our
> own tests bore it out exactly )
> So still not sure i ordered the 613 cam as it was
> advertised as the most powerful solid  racing cam
> currently available for the BB mopar (Muscle motors
> ad from the early days. )
> I replaced the racer brown which was running 11.50s
> at the time  in a 4150 lb car. (I am not kidding
> that is fact it weighs that much)
> The car immediately slowed down. I ran shift loops
> at a different track so know one would bother me for
> two days , tried jettting , tried 1/2 inch fuel line
>  and bigger pump. Different timing settting , moved
> the cam etc etc . Could just get the car into the
> 11s with 11.76 being the best on an extremely good
> run with awesome hook.  MPH was also down so I took
> the engine apart to see if all was well. It was. I
> retested the heads on my flow bench and came again
> up against the limited lift abilty of the heads. I
> took another head and ported each intake port
> different including one  bronzed up and holding a
> 2.3 inch valve made from a reworked BB chey
> valve.Still was unalble to get flow above what my
> heads flowed (I still have this test piece by the 
> way.)
> So i contacted  cam manufacturers and asked for a
> cam with similar opening and closing durations as
> the Ultradyne but reduced lift. Lunati was able to
> supply a cam that had exactly the same specs except
> it was 520 lift. This will be the perfect test i
> thought to see if my tests were correct or if i was
> just dreaming. I installled the cam and immeditaely
> the car ran 11.51 and the miles per hour returned .
> The Lunati was an excellant cam but hard on valve
> springs. It ran exactly to the tenth of a second
> what the STX 20  racer brown ran and the racer brown
> was very easy on parts so I eventually reinstalled
> it. 
> Mr Dvorak by the way draws the line at 530 lift
> while I stretch it to 540 . but even if I am an
> idiot he is no fool when it comes to these motors.
> So bottom line is would  a car with a j high lift
> ultradyne or Hughs cam and ported iron heads run
> faster with a STX 20 racer brown or the 520 Lunati
> listed in my book? The answer is YES.  Because the
> cam more suits the design of the iron cly heads. 
> I believe however with after market heads the
> ultradyne would do the job if the heads support flow
> above say 615 to 629 lift. 
> As for the rocker ratios. I would like so see a
> controlled test back to back runs  with 1.5s 1.6s
> and 1.7 on an iron head engine. I suspect the actual
> results would be "dissappointing" to say the least
> however me and Wagar are going to try that this
> summer. to find out for sure because there is
> nothing like actually testing the stuff. I asked my
> cam grinders what they thought and they both said
> "sometimes it works, sometimes it doesnt. There are
> many factors involved "
> We made a set of 1.7s in the seventies and tried
> them on my 440 dart. there was 0 difference  but
> times have a changed and i want to try it again. 
> Having said all that if you love your cam just enjoy
> it and dont worry about what i think.. You car is
> running real strong and that is all that matters. 
> My only intent is to help us all go faster with
> fewer bucks spent.
> Don
> 
>  
> Author of
> Return to Deutschland (True Adventure)
> Old Reliable (Mopar)
> http://stores.ebay.ca/Don-Dulmage-Enterprises
> [Non-text portions of this message have been
> removed]
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