Author Topic: Cube vs K style BV on injection setup?  (Read 474 times)

Offline wideopen231

  • Hero Member
  • *****
  • Posts: 1194
    • View Profile
  • Your Best Time: 1/8 3.70@ 198 1/4 5.78@245
  • Your Engine: Hemi 526 ci alcohol
  • Your Track: Piedmont
  • Your Vehicle: 225 CMC FED
  • General Location: NORTH CAROLINA
Cube vs K style BV on injection setup?
« on: June 09, 2018, 11:10:18 AM »
Ok new set for FED has aKstyle BV with injection. Normally I have run cube style with injection and K style with blower. Issue I am having is BV leakage lot lower than I would expect 20% vs 28 to 32%. Nozzle sizing seems to be wanting smaller in order to keep main in are I like to run mine at.

My thoughts are. K style has better flow less restrictive. SO need to flow less to get same fuel at idle. Although it would seem leakage is leakage thru BV.
 Less pressure drop means nozzles are seeing more pressure and glowing more fuel than would if had more restrictive BV.

Question is. Are thoughts on right path or out looking for left field and something else I am missing

  Pump is 6.85 gpm dsr
  BV K style with spool from blown alky
 nozzles are.020 hats and .028 ports equal to .035 or so flow wise.
 Main is 125
 bypass is .050 after not building heat with just main
Relecting obama is like shooting right foot because it did not hurt enough when you shot left foot

Offline wideopen231

  • Hero Member
  • *****
  • Posts: 1194
    • View Profile
  • Your Best Time: 1/8 3.70@ 198 1/4 5.78@245
  • Your Engine: Hemi 526 ci alcohol
  • Your Track: Piedmont
  • Your Vehicle: 225 CMC FED
  • General Location: NORTH CAROLINA
Re: Cube vs K style BV on injection setup?
« Reply #1 on: June 10, 2018, 11:33:14 AM »
SPud, Difference in blower spool and tunnel ram spool? For a K style BV.
Relecting obama is like shooting right foot because it did not hurt enough when you shot left foot

Offline Glany1982

  • Newbie
  • *
  • Posts: 1
    • View Profile
  • Your Best Time: none
  • Your Engine: none
  • Your Track: none
  • Your Vehicle: i drive my friend's
  • General Location: North Coast
Re: Cube vs K style BV on injection setup?
« Reply #2 on: June 18, 2018, 02:23:06 PM »
SPud, Difference in blower spool and tunnel ram spool? For a K style BV.
would really like to know the difference in blower spool and tunnel ram spool as well. i just see nobody answered... have you found an answer yourself and can update? please? thanks!

Offline wideopen231

  • Hero Member
  • *****
  • Posts: 1194
    • View Profile
  • Your Best Time: 1/8 3.70@ 198 1/4 5.78@245
  • Your Engine: Hemi 526 ci alcohol
  • Your Track: Piedmont
  • Your Vehicle: 225 CMC FED
  • General Location: NORTH CAROLINA
Re: Cube vs K style BV on injection setup?
« Reply #3 on: June 25, 2018, 01:32:45 PM »
Yes and no.LOL  Difference is back where it shuts off outlet is little bigger on tunnel ram spool.V notch is wider and blends in over and down from top. My guess is because of smaller leakage rat 25 to 30 vs 65  to 75%. Also bypass hole in blower spool that feeds main jet is not in tunnel ram spool.There is passage at main inlet that also feed main jet. My guess is allows more bypass fuel(bigger pump w/blower) while throwing more fuel at hit to motor since blower will pretty much take what you throw at it at that moment.

Stay tune for question on no hole in spool for main.
Relecting obama is like shooting right foot because it did not hurt enough when you shot left foot

Offline Spud Miller

  • Global Moderator
  • Sr. Member
  • *****
  • Posts: 298
    • View Profile
    • Fuel Injection Ent., LLC
Re: Cube vs K style BV on injection setup?
« Reply #4 on: July 26, 2018, 07:57:52 PM »

 There is a pic of the two next to each other on the FIE webstore:
https://fuelinjectionent.myshopify.com/collections/metering-valve/products/metering-valve-rotor-k-style

A is supercharged (slot goes all the way through), B is naturally aspirated (progressively deep V groove).

If your barrel valve leakdown percentage is lower than you'd expect, it's probably because your idle (main) check valve pressure is too high. For the most part, the following works well to start with...

Supercharged: 7-10 PSI idle check valve, 70-75% leakdown
Naturally aspirated: 1-2 PSI main check valve, leakdown at 7% of the engine size in cubic inches. ie. 350 * .07 = 24%

Spud

Fuel Injection Enterprises, LLC
     Mechanical Injection
     Magnetos
     EFI Conversions