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Re the "void" after the e-jets on some blocks, yep, they're there on some of them. The BLP, Holley Ultra and Demon blocks I've had were all drilled "big" through to the main well. The 5-e Quick Fuel blocks are, too, I believe. However, their gas 4-e blocks (and the comparable blocks from Proform) are threaded, but pre-drilled for .028 and only have blank e-jets where plugs are used. Their instructions say if you want to be able to change the sizes that you should drill out the .028 to .050 and then use typical drilled e-jets.
When they're used as they come from Quick Fuel or Proform, it's basically the same config as an "old school" Holley cast block where there is a larger drilled opening leading to a smaller drilled bleed. Here's a pic from the side showing both an old Braswell-modified Holley cast HP block next to a Quick Fuel with the original drillings that are used w/o replaceable jets. I have to ASSume, since I'm not going to cut apart any metering blocks to know for sure, that when they're done this way there is no effective "void" and the opening of the drilled e-bleed is right into the main well.
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Then consider that the cartridge used in a RapidJet metering block has all of it's tuning orifices (emulsion, IFR, PVCR) drilled straight into the "tube", and the emulsion bleeds are drilled into the thinnest section area. No void there, but not much of a "lead in", either... just a hole.
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At some point you'll realize that all this stuff can drive you crazy looking for "answers". And for myself, I have to wonder even if I find "the answer" to one of my bazillion questions on this subject, is it going to make any detectable difference to the end result of how effectively my carb(s) work?
Hypothesis and theory take a back seat to reality once it's bolted down and fuel & air are flowing through it. I need to remember this as much as anyone.
Statistics: Posted by BradH — Sat Feb 20, 2021 5:02 am
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I could see that if you were to drill .070” hole and were able to bottom out a non flanged set screw on that hole there would not be such a situation but most I see and the ones I use are a flanged head to positively stop on a stepped hole.
It was the recessed bleeds in the first below pic that got me thinking about this compared to black block in first post and red blocks below
Statistics: Posted by Right hand drive — Fri Feb 19, 2021 10:24 pm
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But doing the below would create that void as threaded hole is around 7mm deep and screw in bleeds are 3 - 4mm long
Would Holley and Quickfuel have the same thread void?
Statistics: Posted by Right hand drive — Wed Feb 17, 2021 11:35 am
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Is an unwanted turbulence created?
Statistics: Posted by Right hand drive — Wed Feb 17, 2021 2:49 am
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