Author Topic: S&S Carb Specs  (Read 862 times)

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Offline WhipLash96

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S&S Carb Specs
« on: July 25, 2020, 08:38:53 AM »
Looking to go a different rout as far as Carb goes on my 124. Currently using the CV 51 but I want my cruise control back. I looked at the S&S site but they do not list the actual size (50mm, 52mm etc). Obviously I'm looking for a minimum of 51. Thanks!
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Whip

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Re: S&S Carb Specs
« Reply #1 on: July 25, 2020, 08:57:04 AM »
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Offline turboprop

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Re: S&S Carb Specs
« Reply #2 on: July 25, 2020, 10:01:44 AM »
Looking to go a different rout as far as Carb goes on my 124. Currently using the CV 51 but I want my cruise control back. I looked at the S&S site but they do not list the actual size (50mm, 52mm etc). Obviously I'm looking for a minimum of 51. Thanks!


I am really interested in know more about your 124 with the CV51. As maya or may not be aware, I have a couple of TC124 engines in FXRs. The one in my blue bike is built with high speed touring in mind. It is currently equipped with a Mik48 with a pro back on a Super D intake. No issues but always looking for something better. In this case, better means improved gas mileage and even flatter AFR ratio.

FWIW - I have a Zippers G3 that I ran on my other TC124/FXR that is built for street racing. I didnt like the G3 as it never really ran right at cruise. WOT was perfect.
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Offline JW113

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Re: S&S Carb Specs
« Reply #3 on: July 25, 2020, 11:38:21 AM »
I realize this is not what you are asking, but as a data point to take or leave, my 113" with CV51 typically gets 46mpg at a stead 75mph. I have not yet put the WEGO on it to try and optimize it more, which I'm sure could be done. I just don't ride it enough these days to bother with it. Have to say, I do love the CV51 though.

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Offline turboprop

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Re: S&S Carb Specs
« Reply #4 on: July 25, 2020, 01:26:00 PM »
Looking to go a different rout as far as Carb goes on my 124. Currently using the CV 51 but I want my cruise control back. I looked at the S&S site but they do not list the actual size (50mm, 52mm etc). Obviously I'm looking for a minimum of 51. Thanks!

S&S certainly does list the sizes of their carb it is just not in your desired format. YOU will have to do the conversion yourself from inches to mm. Is this what you are looking for, someone to do the math for you?
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Offline cheech

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Re: S&S Carb Specs
« Reply #5 on: July 25, 2020, 01:27:34 PM »
Per the S&S jetting instructions for the E and G carbs.
The Super E has a 1 7⁄8” (47.6mm) bore and 1 9⁄16” (39.6mm) venturi.
The Super G has a 2 1⁄16” (52.3mm) bore and 1 3⁄4” (44.5mm) venturi.

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Re: S&S Carb Specs
« Reply #6 on: July 25, 2020, 02:30:18 PM »
Call S&S. I bought a Super E for my bike a couple months ago & I had the option [no extra charge] of a bored out carb. I took the bored out one. m
Might be the same for the G. This isn't listed in their catalog or on their website so you'll have to call.

Offline Deye76

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Re: S&S Carb Specs
« Reply #7 on: July 25, 2020, 04:52:33 PM »
None of the dealers I checked, offered a bored carb, I recently bought a G, and would have gone with a bored one. Should have called you first, Larry. Can you say what the cost difference was?
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Re: S&S Carb Specs
« Reply #8 on: July 25, 2020, 05:05:19 PM »
Looking to go a different rout as far as Carb goes on my 124. Currently using the CV 51 but I want my cruise control back. I looked at the S&S site but they do not list the actual size (50mm, 52mm etc). Obviously I'm looking for a minimum of 51. Thanks!

Don't determine what you want or need based only on the size stamped on the carburetor.

This is a carburetor study that Mad Max did several years ago. It has a lot of very useful information.


https://harleytechtalk.com/htt/index.php/topic,1242.0.html

https://harleytechtalk.com/htt/index.php/topic,1241.0.html

https://harleytechtalk.com/htt/index.php/topic,1238.0.html
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Offline sharkoilfield

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Re: S&S Carb Specs
« Reply #9 on: July 25, 2020, 07:59:07 PM »
Buddy’s 2006 Road King came with carb/cruise. After 124 kit, we easily modded a 51CV for his cruise. I also ran the 51CV on my 103 FXDXT years ago. Parts must be unobtainable nowadays

Offline WhipLash96

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Thanks,
Whip

Offline WhipLash96

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Re: S&S Carb Specs
« Reply #11 on: July 25, 2020, 11:01:40 PM »
Looking to go a different rout as far as Carb goes on my 124. Currently using the CV 51 but I want my cruise control back. I looked at the S&S site but they do not list the actual size (50mm, 52mm etc). Obviously I'm looking for a minimum of 51. Thanks!


I am really interested in know more about your 124 with the CV51. As maya or may not be aware, I have a couple of TC124 engines in FXRs. The one in my blue bike is built with high speed touring in mind. It is currently equipped with a Mik48 with a pro back on a Super D intake. No issues but always looking for something better. In this case, better means improved gas mileage and even flatter AFR ratio.

FWIW - I have a Zippers G3 that I ran on my other TC124/FXR that is built for street racing. I didnt like the G3 as it never really ran right at cruise. WOT was perfect.

I Love the CV 51 for all of the reasons that you mention, I just really miss my CC.
Thanks,
Whip

Offline WhipLash96

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Re: S&S Carb Specs
« Reply #12 on: July 25, 2020, 11:03:11 PM »
Looking to go a different rout as far as Carb goes on my 124. Currently using the CV 51 but I want my cruise control back. I looked at the S&S site but they do not list the actual size (50mm, 52mm etc). Obviously I'm looking for a minimum of 51. Thanks!

S&S certainly does list the sizes of their carb it is just not in your desired format. YOU will have to do the conversion yourself from inches to mm. Is this what you are looking for, someone to do the math for you?
I agree, not used to how they state their specs but I was able to do the math. :smiled:
Thanks,
Whip

Offline WhipLash96

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Re: S&S Carb Specs
« Reply #13 on: July 25, 2020, 11:07:13 PM »
Buddy’s 2006 Road King came with carb/cruise. After 124 kit, we easily modded a 51CV for his cruise. I also ran the 51CV on my 103 FXDXT years ago. Parts must be unobtainable nowadays

I am curios as to how you did this? When I bought the 51 that was my intention was to convert it to CC but then I was told by a friend whom I trust deeply that it couldn't be done. i had converted a 44 that wasn't cc compatible pretty easily. I figured I could do it the same way but was told no..
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Whip

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Re: S&S Carb Specs
« Reply #14 on: July 26, 2020, 05:48:48 AM »
None of the dealers I checked, offered a bored carb, I recently bought a G, and would have gone with a bored one. Should have called you first, Larry. Can you say what the cost difference was?
Call S&S. I bought a Super E for my bike a couple months ago & I had the option [no extra charge] of a bored out carb. I took the bored out one. m
Might be the same for the G. This isn't listed in their catalog or on their website so you'll have to call.

Offline jsachs1

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Re: S&S Carb Specs
« Reply #15 on: July 27, 2020, 01:39:29 PM »
If your carb jig lets your carb bore run true to the existing carb bore, you should be able to make a "G" carb bore 2 mm. larger.
John

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Offline WhipLash96

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Re: S&S Carb Specs
« Reply #16 on: July 27, 2020, 07:58:43 PM »
None of the dealers I checked, offered a bored carb, I recently bought a G, and would have gone with a bored one. Should have called you first, Larry. Can you say what the cost difference was?
Call S&S. I bought a Super E for my bike a couple months ago & I had the option [no extra charge] of a bored out carb. I took the bored out one. m
Might be the same for the G. This isn't listed in their catalog or on their website so you'll have to call.

Thanks for the heads up!
Thanks,
Whip

Offline WhipLash96

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Re: S&S Carb Specs
« Reply #17 on: July 27, 2020, 08:00:14 PM »
If your carb jig lets your carb bore run true to the existing carb bore, you should be able to make a "G" carb bore 2 mm. larger.
John

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How much does boring that slow down the velocity of an S&S carb?
Thanks,
Whip

Offline Admiral Akbar

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Re: S&S Carb Specs
« Reply #18 on: July 27, 2020, 08:49:21 PM »
Velocity through the venturi will drop by the difference in area of the venturi assuming same flow. Flow = velocity times area.
« Last Edit: July 28, 2020, 12:02:05 AM by Admiral Akbar »
I guess the dead chicken thing don't work anymore.

Offline WhipLash96

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Re: S&S Carb Specs
« Reply #19 on: August 02, 2020, 08:05:32 AM »
Velocity through the venturi will drop by the difference in area of the venturi assuming same flow. Flow = velocity times area.

Thank You Sir!
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Whip

Offline 98fxstc

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Re: S&S Carb Specs
« Reply #20 on: August 02, 2020, 05:35:16 PM »
Velocity through the venturi will drop by the difference in area of the venturi assuming same flow. Flow = velocity times area.

Its not quite this simple is it Max?
Velocity of flow is a gradient reducing radially from the centre to the outside walls due to friction at the wall
Frictional losses are linearly related to the diameter while area increases with the square of the diameter
So there would be slightly increased flow with increase in diameter ? 

Offline Admiral Akbar

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Re: S&S Carb Specs
« Reply #21 on: August 03, 2020, 07:41:18 PM »
Velocity through the venturi will drop by the difference in area of the venturi assuming same flow. Flow = velocity times area.

Its not quite this simple is it Max?
Velocity of flow is a gradient reducing radially from the centre to the outside walls due to friction at the wall
Frictional losses are linearly related to the diameter while area increases with the square of the diameter
So there would be slightly increased flow with increase in diameter ?

It never is unless you want to go to the 27th order of flow. but the formula is still valid except I probably should have written "average velocity" instead of "velocity".

Surface fiction does not make that much difference since flow gradient drops off quickly.  Instead of comparing the measured diameter it is probably worthwhile to compare diameters - a say measured minus 0.020" when calculating the effective area.  If using a knife edge orifice, surface friction drops to 0.
I guess the dead chicken thing don't work anymore.

Offline 98fxstc

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Re: S&S Carb Specs
« Reply #22 on: August 03, 2020, 09:16:44 PM »
Velocity through the venturi will drop by the difference in area of the venturi assuming same flow. Flow = velocity times area.

Its not quite this simple is it Max?
Velocity of flow is a gradient reducing radially from the centre to the outside walls due to friction at the wall
Frictional losses are linearly related to the diameter while area increases with the square of the diameter
So there would be slightly increased flow with increase in diameter ?

It never is unless you want to go to the 27th order of flow. but the formula is still valid except I probably should have written "average velocity" instead of "velocity".

Surface fiction does not make that much difference since flow gradient drops off quickly.  Instead of comparing the measured diameter it is probably worthwhile to compare diameters - a say measured minus 0.020" when calculating the effective area.  If using a knife edge orifice, surface friction drops to 0.

Thankyou Max
your carbie flow test results were referenced again recently
Apart from looking at different brands and sizes , did you look at flow with diameter increase in a particular carbie ?

Offline Admiral Akbar

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Re: S&S Carb Specs
« Reply #23 on: Yesterday at 05:08:51 PM »

Thankyou Max
your carbie flow test results were referenced again recently
Apart from looking at different brands and sizes , did you look at flow with diameter increase in a particular carbie ?

I have.. A good one to look at is to compare the 42 / 45 / 48 mikunis.  All the info is in the flow tests.
I guess the dead chicken thing don't work anymore.

Offline 98fxstc

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Re: S&S Carb Specs
« Reply #24 on: Yesterday at 10:05:13 PM »

Thankyou Max
your carbie flow test results were referenced again recently
Apart from looking at different brands and sizes , did you look at flow with diameter increase in a particular carbie ?

I have.. A good one to look at is to compare the 42 / 45 / 48 mikunis.  All the info is in the flow tests.

Thankyou