RockinRiviDad

Holley Sniper EFI on my Nailhead

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On 1/2/2020 at 3:44 PM, RockinRiviDad said:

The Q-jet Sniper is only 715cfm’s.

The square bore Sniper is 800cfm’s.

 

Hmmm, that's odd, given the Q-Jet carb was bigger than the Carter (due to the massive secondaries).  I'm guessing that maybe the Q-Jet Sniper has smaller primary air valves to match the manifold, but same smaller secondaries as the square bore version?  :huh:

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Posted (edited)

I would be interested in learning how rated CFM for efi compares to rated CFM for carburetors.

 

After 60 years of playing with carburetors, the best explanation for carburetor CFM that I have seen was written by Mark Twain!

 

Jon

Edited by carbking (see edit history)

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1 hour ago, carbking said:

After 60 years of playing with carburetors, the best explanation for carburetor CFM that I have seen was written by Mark Twain!

 

Jon

And that is......?

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Posted (edited)
49 minutes ago, RivNut said:

And that is......?

 

"Figures don't lie, but liars figure".

 

Quotation attributed to Mark Twain.

 

CFM

 

And to take the comment about liars even further, one company making carburetors wanted a 600 CFM for comparison with a competing brand. When engineering informed sales that since the company historically had not made a 600, new components (throttle shafts, throttle plates, venturii, etc.) would all have to be designed and machined, sales said "no problem, just take a 625 add a new id number, and sell it as a 600!

 

Jon.

Edited by carbking (see edit history)
  • Haha 1

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Posted (edited)
1 hour ago, carbking said:

And to take the comment about liars even further, one company making carburetors wanted a 600 CFM for comparison with a competing brand. When engineering informed sales that since the company historically had not made a 600, new components (throttle shafts, throttle plates, venturii, etc.) would all have to be designed and machined, sales said "no problem, just take a 625 add a new id number, and sell it as a 600!

 

Yep … companies know that almost nobody has the tools or the inclination to actually measure things.

Edited by J3Studio (see edit history)

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In hopes to help keep others from making the same mistakes I am making, I edited my original post. Again, I was so focused on getting my throttle linkage hooked up & simply too excited to be making progress that I forgot to recheck my TPS (throttle position sensor) after fab’ing a bracket to incorporate my kickdown. My kickdown switch was limiting throttle travel to 76% @ WOT. A few days work but finally got it to 92%…I am good with that…92% gives me enough power to smoke my meats!! 🤣

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