.600 boosters do signal more, but with a fuel channel on the small side it will become a restriction with any significant HP demands. I designed a .610, it signals harder than any booster from any other I've tried, and with a redesigned fuel channel the will supply about 700 HP worth of methanol in a 4150. For more HP I use a custom .545.
Statistics: Posted by jmarkaudio — Wed Apr 06, 2022 6:54 pm
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I forgot to mention earlier the AFR is not only a little leaner with the BLP booster carb and its calibration but a lot more steady AFR until mains start joining in. Almost fi like flipping between two AFR lambda numbers.
Took a look and a few measurements of the two different boosters between the two carbs. Both inserts same overall length. The Demon inserts are a bit taller out of the top of the banjo therefore a larger entry radius. Trailing edge shape the same. Demon trailing edge around .035”-.039” below minor diameter and BLP around .070” below.
So there are a few differences there but without being able to get in and measure actual discharge hole size in the Demons, step size and insert i/d after step for both insert brands and even internal channel dimensions in the Demon booster inserts it seems to be speculation as to low cfm sensitivity and effect on IFR/iab requirements between the two.
What raised an eyebrow and had me curious of hole size effect in annulars is out of about 12 Mighty and Race Demon carbs I have built and tuned with full recalibration this is the first that has needed as large as .035” IFR (low) and low as .067” iab and still be around 1.0 lambda (they are all tuned on the same engine). It may be some other idiosyncrasy of that particular carb leading to the tune state but learning of the effects of these types of variations helps the learning curve and component application and selection for the next street/strip carb build.
Being a fan of annulars I might have to get a bag of blank inserts and experiment.
They look ok in the black Demon too Mike.
Statistics: Posted by Right hand drive — Wed Mar 16, 2022 12:00 pm
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With .600” i/d annulars which would you expect to pull fuel earlier, 1) a lot of smaller discharge holes such as the BLP 16 hole or 2) fewer but larger discharge holes such as std Demon and I think Holley with eight holes?
(Sorry don’t know the discharge hole size for the latter, but definitely larger than the BLP 16 holes)
Statistics: Posted by Right hand drive — Sun Mar 13, 2022 10:39 am
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