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yellow rose said:
Didn’t see this before I posted the answer for Rumble. It’s classed as a 650 but will flow 730ish.
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Edit: it has a fixed venturi so I can’t change the size. But, if I was feeling froggy I could order a 1.750 throttle bore baseplate and that would pick it up some.
 
What I.D size booster and is it stepped?

I'd loan you my booster tool but your on the other side of the world:lol:
 
I am very interested as I am considering doing the same thing for my boat. Please keep us updated on how it responds to tuning changes when you’re dialing it in.
 
Is that a 3 circuit carb?

Also can you tell me what the distance is from the start of the bell mouth to the top of the booster? That design looks to be a damn sight better shape than the Holley HP designed entrance.

What's the main body's total height from the the entrance to where the base plate is mounted?

Sorry for all the questions.:lol:
 
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Hysteric said:
Is that a 3 circuit carb?

Also can you tell me what the distance is from the start of the bell mouth to the top of the booster? That design looks to be a damn sight better shape than the Holley HP designed entrance.

What's the main body's total height from the the entrance to where the base plate is mounted?

Sorry for all the questions.:lol:
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It can be a 3 circuit, but this will be a 2 circuit.

I’ll get some pictures and measurements this morning and post them.

I took my lathe apart to replace the felts and cross nuts and found more issues than I thought. So I stepped it down to nothing.

I wasn’t going to paint it. Then I decided to paint it. Then it looked like crap, so I stripped the paint off. That sucked.

So I spent most of last night painting it up so it can go back together.

What a PITA for sure.
 
Legos are fantastic. Friend went to Legoland and they had a little plastic injection machine that would make you a piece as you watched. Very precise tolerances. They have made more person figures than the population of the Earth...according to them. So that carb is a kit from the base on up? I think Id rather assemble it than buy it from what I got from Demon once.
 
pishta said:
Legos are fantastic. Friend went to Legoland and they had a little plastic injection machine that would make you a piece as you watched. Very precise tolerances. They have made more person figures than the population of the Earth...according to them. So that carb is a kit from the base on up? I think Id rather assemble it than buy it from what I got from Demon once.
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It’s a “builders” kit from BLP. I added a couple of upgrade. A notched rear float, bottom feed needle and seats (I don’t build a carb without them any more) and they installed the boosters.

Everything else the builder does. You can see all the pieces. It’s really pretty easy to score it together and BLP makes really nice stuff.
 
abdywgn said:
what benefits do the bottom feed needle and seats have?
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They can run with less fuel pressure, like 4-4.5 pounds and because the fuel enters the bowl from the bottom and it doesn’t blow down on the fuel already in the bowl it puts much less air in the fuel.

And solid fuel is better, because it’s more stable as far as tuning.
 
yellow rose said:
Building a shiny brand new 1.350 x 1.685 BLP BX4 carb. It will be my tune up. Should be fun.
View attachment 1715624561
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Now that's a good time. Out of curiosity, on a "you" build do you stake your butterfly screws or just loc-tite 'em?

justinp61 said:
BLP make some nice stuff, I have a BX4 main body on my 434. Be aware that they only use BLP air bleeds, unless you turn Holley bleeds down in a lathe. I made a fixture to use in my South Bend.
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What size are you machining them to? I only ask because If I remember right....we've used Demon air bleeds on the BLP body. I think.(been awhile.) The Demon bleed's head was like a .187 diameter compared to the bigger Holley and QF. (.250?)
 
beanhead said:
Now that's a good time. Out of curiosity, on a "you" build do you stake your butterfly screws or just loc-tite 'em?


What size are you machining them to? I only ask because If I remember right....we've used Demon air bleeds on the BLP body. I think.(been awhile.) The Demon bleed's head was like a .187 diameter compared to the bigger Holley and QF. (.250?)
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I Loc-tite them. If I ever want to change the butterflies I can heat them up and they come out.
 
yellow rose said:
I Loc-tite them. If I ever want to change the butterflies I can heat them up and they come out.
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Okay thanks. I've been called a slacker for just using loc-tite but that was by my ford buddy so screw him anyway:D
I didn't like the idea of having to cut/grind/work to get them out in the event of wanting to make a change either.
 
Hysteric said:
Is that a 3 circuit carb?

Also can you tell me what the distance is from the start of the bell mouth to the top of the booster? That design looks to be a damn sight better shape than the Holley HP designed entrance.

What's the main body's total height from the the entrance to where the base plate is mounted?

Sorry for all the questions.:lol:
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Ok, from the start of the bell to the top of the booster is .850 and...from the top to the base plate is 2.670.
 
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