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40's V/S 44's
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Author:  Buckmaster [ Mon Mar 03, 2008 7:28 pm ]
Post subject:  40's V/S 44's
Can i jet up a set of 40's (carbs) to the size of 44's so i wont run my engine lean.I wll have a 2276 with S/F's and the reason i ask is because i am finding a lot of 40's for sale ajnd want to make sure i can put them to use.Info needed please help.
Author:  dunebuggy79 [ Mon Mar 03, 2008 7:37 pm ]
Post subject: 
My buddy had a 2332 with 36 dells and it ran sweet.You just need to call cb performance and get the right jets .

aaron
Author:  Buckmaster [ Mon Mar 03, 2008 7:46 pm ]
Post subject: 
I was thinking i could do that but i did'nt know if i would have to change the venturie's.What role does the venturie's play in a carb.If i spelled that word right.
Author:  bruce 1 [ Mon Mar 03, 2008 7:47 pm ]
Post subject: 
Tim has plenty of jets, call him at Southern Buggys.
Author:  dunebuggy79 [ Mon Mar 03, 2008 8:49 pm ]
Post subject: 
[quote='bruce 1']Tim has plenty of jets, call him at Southern Buggys.[/quote]
he sells delloroto jets?That would be sweet!

aaron
Author:  bruce 1 [ Mon Mar 03, 2008 9:46 pm ]
Post subject: 
[quote='dunebuggy79'][quote='bruce 1']Tim has plenty of jets, call him at Southern Buggys.[/quote]
he sells delloroto jets?That would be sweet!

aaron[/quote]

Sure does I got several from him over the weekend
Author:  The Wild Kids [ Mon Mar 03, 2008 10:03 pm ]
Post subject: 
Besides changing out the jets you can change the venture's as well to make the 40 larger. That is what I did to my Weber 40 IDF's. I have had little problem with mine. The only problem I have is they load up in rough areas going over rocky stuff that bounces the buggy constantly.

The Wild Kids
Author:  Odyknuck [ Mon Mar 03, 2008 10:10 pm ]
Post subject: 
The venturies determine the air velocity thru the carb. If you want low end torque you typically use smaller diameter venturies at the sacrifice of top end. If you want more horse power at the top end you go with larger diameter venturies at the sacrifice of low end. Or you can use a mid size and get over all power. You can have too small or too large of venturies so in essence the venturies are typically sized for a motor CC range. Most 44 webers come with 36mm venturies and work best for most 1835s and up. I am sure guys with smaller displacements are using the same with mixed results. Heads, cam and compression play a role in all this too.
Author:  The Wild Kids [ Mon Mar 03, 2008 10:25 pm ]
Post subject: 
I will have to look but I think what I have is 36's in mine from 32 or 34 which ever it was. Other than the flooding issues in rough stuff other than that it will talk to me and scream on the trails and hills.

The Wild Kids
Author:  kybuggy1 [ Tue Mar 04, 2008 1:55 am ]
Post subject: 
Buckmaster, I think you'll be fine with the 40's. In fact, better off. You'll need the smaller venturii to get a decent intake velocity, especially with those S/F heads. Odyknuck is dead right, its all in the combo, and S/F's are known for great top end, but sacrifice a responsive bottom end. I tried them too, for one ride. :evil: (I'm sure someone will read this that has Superflows and say I'm wrong, each his own. Maybe they just THINK they got good throttle response, just like I THOUGHT I had a lot of torque until I rode Darell's buggy:lol: )

I had 36's factory in my 44 Webers ....and couldnt wait to yank them out. The bottom end response was soooo much better with smaller vents. If you need every last hp your motor can make at very top end, and are afraid to lose those few hp's, then you might need a bigger motor!! :lol:
I've thought about swappin my 44s with my wife's 40 Dells so I could run even smaller venturii. But you know the old saying...."if it aint broke, dont fix it". (Not to mention she might notice it! :lol: )

Larry
Author:  Roy [ Tue Mar 04, 2008 5:44 am ]
Post subject:  Re: 40's V/S 44's
[quote='Buckmaster']Can i jet up a set of 40's (carbs) to the size of 44's so i wont run my engine lean.I wll have a 2276 with S/F's and the reason i ask is because i am finding a lot of 40's for sale ajnd want to make sure i can put them to use.Info needed please help.[/quote]

You can use the 40's and they will work fine. You might find that you have to jet them down, not up. When you suck all that air through a smaller hole (venturi) in the carburetor, it will tend to run riche
Author:  pipedope [ Tue Mar 04, 2008 12:02 pm ]
Post subject: 
i had dave at shadtree change my 36's to 32's this weekend and love the diff. alot more low end.i run 44 webers with s/e heads,fk7 cam.
by the way dave thanks again man.
Author:  Roy [ Tue Mar 04, 2008 5:44 pm ]
Post subject: 
It's a crying shame to see all of you guys running these high dollar heads just to choke them down with smaller venturis to make them work like you want them to. Save all that stuff for the drag strip. Bigger is not always better for low end torque and throttle response. :wink:
Author:  kybuggy1 [ Tue Mar 04, 2008 6:04 pm ]
Post subject: 
[quote='Roy']It's a crying shame to see all of you guys running these high dollar heads just to choke them down with smaller venturis to make them work like you want them to. Save all that stuff for the drag strip. Bigger is not always better for low end torque and throttle response. :wink:[/quote]

What about good heads with unshrouded valves, straighter intake ports with a better cross section design, less intrusion by the guides and thier bosses, exhaust ports designed to flow b
Author:  Roy [ Tue Mar 04, 2008 6:19 pm ]
Post subject: 
All I am saying is it seems like a waste of money to buy drag race heads (super flow) and choke them down to achieve something they are not designed for. You can achieve the same power and low end torque for a third of the cost by using an head that is designed to flow for that application in the first place.
Maybe it's just me, I don't know. It's very complicated to explain how a flow bench works and how velocity works. There are hundreds of variables and every one has different goals on how they want their motor to run. :roll:
Author:  bruce 1 [ Tue Mar 04, 2008 6:30 pm ]
Post subject: 
[quote='Roy']All I am saying is it seems like a waste of money to buy drag race heads (super flow) and choke them down to achieve something they are not designed for. :roll:[/quote]


I agree for the woods I would rather have a good set of 041s or 044 rather than super flows. You need all the low end you can get for the woods. And just a little top end. (but I am sure someone can work with the heads and make them work)
Author:  BUGGYMAN [ Tue Mar 04, 2008 6:54 pm ]
Post subject:  40s vs 44s
I run Dell 40s on my 2176cc shadetree performance motor and it runs awesome. It has 044 heads 42x37.5 valves, 110 engle cam with 1.25 ratio rockers and its stout as can be. I run weber 44s on my 1915 4 seater and they run great as well. You just got to know what size jets and venturies to go with. Call Shadetree Performance, he can dial you in, at least he did for me, I couldn't be any happier.

Just my 2 cents
Donnie
Author:  Buckmaster [ Tue Mar 04, 2008 8:48 pm ]
Post subject: 
I did'nt know that S/F's would be a only top end type head.I got a good deal on them and figured i could make them work,but i could always sale them and get a set of 044's or street elim.I'm not going to make it to the poker run so does anybody want a set of S/F's.I'll sale them for $500,they have new springs and have been checked for any defects.Or trade for a set of dual carbs.
Author:  sdbillyg [ Tue Mar 04, 2008 9:31 pm ]
Post subject: 
I hear people talk about low end and throttle response but I have not seen a video of somebody ideling up a hill yet usually half throttle or more
Author:  frankenbuggy06 [ Tue Mar 04, 2008 9:58 pm ]
Post subject: 
well hell ya ppl wanna show off for the camera. :lol: :lol: :lol:
Author:  kybuggy1 [ Wed Mar 05, 2008 12:19 am ]
Post subject: 
[quote='Roy']All I am saying is it seems like a waste of money to buy drag race heads (super flow) and choke them down to achieve something they are not designed for. You can achieve the same power and low end torque for a third of the cost by using an head that is designed to flow for that application in the first place.[/quote]

I agree 100%, Superflows would not ever be my choice again for in the woods. I was just asking your opinion, didnt mean to sound arqumentative at all.
Author:  kybuggy1 [ Wed Mar 05, 2008 12:42 am ]
Post subject: 
[quote='Buckmaster']I did'nt know that S/F's would be a only top end type head.I got a good deal on them and figured i could make them work,but i could always sale them and get a set of 044's or street elim.I'm not going to make it to the poker run so does anybody want a set of S/F's.I'll sale them for $500,they have new springs and have been checked for any defects.Or trade for a set of dual carbs.[/quote]

There are some that swear by them for working well in all rpm ranges. But
Author:  The Wild Kids [ Wed Mar 05, 2008 12:52 am ]
Post subject: 
I stand corrected on the ventures I went the wrong way when I said that.

The Wild Kids
Author:  Strong [ Wed Mar 05, 2008 10:42 pm ]
Post subject: 
Buck, Do not size the carbuerators. You actually should size the venturies in direct relation to the mm size of the INTAKE VALVE. Venturi mm larger than valve = Top end (drag race), Venturi mm smaller than valve= Tourqer (no rpm's or wheel speed), Venturi same size as valve is a good compromise. Mine is 44 mm intake valve, 42 mm vents. I am going to remove the venturies completely and run staight through the 48's. Run the largest VENTURI possible that will spin the the tires at any rpm without disengaging the clutch. P.S. Always build the largest motor with the largest heads (mine is 2643cc with ported, titaniun valved, beehive sprung, SUPERFLOW heads. Then you can adjust the tourqe of the engine to match the buggy by changing tire size, transaxle gearing or removing weight. Do this correctly and you will have a bottom end woods buggy that will also scream on the top side. Ihope this helps.
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