[TPR] Carb and fuel pump

Sun Dec 8 11:49:01 PST 2013

Hi all,
I already sent Asa some info . . . 

It would seem, for whatever reason, he is not getting enough air and/ or fuel.  ????  I run HUGE fuel lines (compared to recommendations) on most everything.  Still believe the 460 goes lean - time for a Robb super pump?

So, Asa, bigger air filter? bigger fuel lines?  Fuel pump running to spec?

have fun.

shoveling snow . . .
  ----- Original Message ----- 
  From: Charles Engles 
  To: 'B Hower' ; michael at michaelshortt.com ; 'Asa Jay Laughton' 
  Cc: 'TPR List' 
  Sent: Sunday, December 08, 2013 12:43 PM
  Subject: Re: [TPR] Carb and fuel pump

  Dear Bud,

                      Boy, I hate it when someone throw real world experience and evidence in the middle of a theoretical discussion!  Nicely done.

                     From your experience, I think we can eliminate the 600 cfm Holley as the culprit and consider the other potential causes.

                                             Warmest regards, Chuck Engles

  From: TPR [mailto:tpr-bounces at teampanteraracing.com] On Behalf Of B Hower
  Sent: Sunday, December 08, 2013 1:40 PM
  To: michael at michaelshortt.com; Asa Jay Laughton
  Cc: TPR List
  Subject: Re: [TPR] Carb and fuel pump

  FWIW -- I have had a gps reading of 147 mph with a 600 cmf Holley and stock style aftermarket fuel pump. Engine was running iron 4V heads, .030 over bore. Isky hyd cam.

  Bud #3400 ( Drive it like there is no tomorrow -- for there may not be ! )

  On Sunday, December 8, 2013 1:27 PM, "michael at michaelshortt.com" <michael at michaelshortt.com> wrote:

  Asa,

  How restrictive is your air intake apparatus?  If too restrictive,  that can have dramatic effect, imagine an asthmatic running a marathon.

  Michael

  On Dec 8, 2013 2:17 PM, "Asa Jay Laughton" <asajay at asajay.com> wrote:

  Hi all,

  This year (2013) at the Silver State Classic Challenge, I recorded a top speed in the trap of 130.7 MPH.  When I reached the countdown to the trap I was already doing just shy of that to bank time before the Narrows.  I consciously pressed the accelerator a bit more to push her up to a goal 135 MPH, but nothing happened.

  I speculate at 130 MPH, I'm using up all the carb, or all the fuel pump.  One, the other, or both.

  The Carb is a Ford stamped Holley list with these numbers:

D8PE-9510-KALIST 84143113This link shows my email back in 1999 with info from Holley that I obtained.
  http://poca.com/detomaso/1999-09/329.html
  Apparently it's a 600 cfm.  it has vacuum secondaries and three-quarter turn emission lockouts on the mixture screws.  I've put a standard rebuilt kit through it once or twice.  It's been a really good carb, but I don't know it will pull more than 130 MPH.

  What to do.
  As always, money is a bit of an issue.  I'd like to install EFI but that's really expensive.
  I'd like to keep it responsive at low rpm like she is now, but still have the throughput needed at higher rpm at top speeds.  I think this leans me toward a vacuum secondary rather than mechanical.  I'm sure the cfm needs to be cranked up, but would 650 do it or should I head for 700 or higher?

  Does anyone have one they'd be willing to part with?
  Should I send mine into someone like Chuck Nuytten and have them do their magic on it, replacing metering blocks and other mods?
  Should I just buy a new one?

  The engine is a 351C bored .030 over, stock stroke.
  Heads are DOAE, quench chamber.
  Cam is a Crane hydraulic roller with these specs

  Intake is an FPP 4145
  Stock ZF transmission

  I've got some time so I'm looking for some informed/experienced opinions on what carb would be best.

  And since Professor Engles from the Midwest Division of the Pantera Research Institute is engaged with Fuel pump questions, I'll just follow his thread on that part. :)

  Thanks,
  Asa Jay

-- Asa Jay Laughton, MSgt, USAFR, Retired& Shelley MarieSpokane, WA******************************     http://www.racingagainstautism.comhttp://www.teampanteraracing.comhttp://facebook.com/racingagainstautism-- Asa Jay Laughton, MSgt, USAFR, Retired& Shelley MarieSpokane, WA******************************     http://www.racingagainstautism.comhttp://www.teampanteraracing.comhttp://facebook.com/racingagainstautism
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