Still getting my 572 Hemi with Stage v heads together. Gonna run the Stage 2x4 intake with the carbs sideways. I have 2 850's with down leg boosters. Just curious of the latest tech with annular booster in a 4150 body? Street/strip deal with 12:1 compression and a 275@50 on 110 solid roller. All opinions welcomed.

Just my OPINION based on my personal experiences, but... I think 4150s with down leg boosters will be easier to tune for that combination. FWIW, I'll be trying out a couple of different 4150 annular carbs in the future to see if I can get them to run as clean on the street and still perform well on the track as my "go to" 4150 down leg carb(s).

Seems i remember DVW using annulars in his 4150's. I think race only thou. I ran a 1150 Dominator on the street and it ran very clean, no issues at all with that carb. Did everything expect and then some. 4150 has a smaller venture, so not sure what you can get away with on those on a street tunnel ram deal with annulars.

My racecar runs 24 hole annulars built by Lightning Racing carbs. Since I footbrake with a large plenum intake (Indy 440-25) they were suggested. The 60 ft be much more consistant. I've been very happy with them. Mark is great to work with. It's actually had 2 different pairs of main bodies. NMCA wouldn't allow me to run thr billet bodies. Dumb rule. It runs exactly the same with either set. Car has a 285/292@.050 cam. Idles fine at 900. Obviously no street driving . It drives fine in the pits and doesn't load up.
https://www.facebook.com/lightningracingcarburetors/
Doug

Well, I run a 1050AN Quickfuel on my engine. 493 stroker that is mostly street driven. Smallish SFT cam (259/266 duration @ .050). Lift is .627/.633. Track time is usually 4-6 times a year. No issues what so ever with the carb. Nice throttle response, runs clean. NO issues with tuning. Just my 2 cents.

The best 4150 carb that we have for the dyno is a QF 1050 AN. I've never run it on the street but it makes really nice power on the dyno. It works great on 600 and 700 hp engines.

"Never mind..."

DVW, are you able to give the Venturi, booster and blade sizes? I like the set up.

As I remember venturi size is 1.590". Throeele blades a the legal NMCA 1.750"
Doug

Thank you for that. My Stage v 2x4 intake looks to have a large plenum as well. It has a tunnel that joins both carbs.

I have had excellent results with my QF 1050AN. Waaaay back when I stsrted running it everyone said it was junk lol.

I have always thought it would be better to spray a mist of fuel rather than droplets of solid fuel. The spray atomizes much faster and burning most of the fuel instead of it going out the tail pipe unburned. The problem seems to be that when running annular boosters, you need a large venture for the that booster to work well, like what you find in a Dominator. I have been hearing there may be some new tech in the annular booster for the 4150. Thought i would post to see what any of you have heard or experienced with this. I already have a pair of down leg custom 850's for the Hemi, but would like to try annular booster instead.

Some of it is temp related. The annular boosters work great in cold weather but a down leg will typically make more power in a race engine in a 4150 carb. Annular booster 4150 will usually make a bunch more low end torque than a dog leg, but the dog leg wins up top. So basically the annular booster 4150 might be better for a street car, but race cars usually get a dog leg booster in a 4150. The 4500 is a different story of course.
And these are just rough generalizations. I don't think anyone has ever been able to show that one is better than the other for all situations. There are just certain situations where one type of booster will work better than another.

Ok, i understand Andy, but i hearing something new with annulars is on the horizon. There is a new polymer annular booster for Dominator that is showing very promising results over the old annular boosters and it sounds like maybe something coming for the 4150 as well. Lets hope its true, but anyway i am really thinking about new annular 4150 bodies for my Hemi deal. Maybe i can use these down leg 850 bodies on my street/strip 511 tunnel ram deal in place of the 650 bodies i have been using with great results.

There are some interesting tech articles on Pro-systems website. I think where the annular shines is in a larger carb with lower vacuum signal applications.


https://www.prosystemsracing.com/choosing-a-carb-size/

I really dont see much about Patrick at Prosystems any more. I know a carb shop that has repaired/fixed a few of his Patrick's carbs.

If it’s pump gas then for certain you want a GOOD annular booster. They ain’t all the same.

Call Mark Whitner at Lightning Racing Carbs and buy your boosters from him. He makes the best AB’s out there and the second best isnt even close.

Mark is the guy to talk to about annular boosters. He is a big fan and he spends a lot of time working on them and researching them. He has done several annular booster upgrades for me.

Ok,thank you

Thumper (Dom) would be a good source of information too.