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Jeff Gill
Samba Member
Joined: December 17, 2007
Posts: 77
Location: Dover,Pa
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 Posted: Wed Feb 04, 2009 5:17 pm Post subject: 40 or 44 for single setup |
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| Im racing offroad and I have a 1915 with 044's I have a 44 but it need a throatle shaft, I also have a really nice 40 idf that I could put on. My question is would it be a big power difference between the two ? I am more concerend with torque ! also what venturie should I use if I were to use the forty |
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Art Thraen
Samba Member
Joined: January 19, 2004
Posts: 478
Location: Utah
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| Posted: Wed Feb 04, 2009 6:11 pm Post subject: |
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I have a single set up for off road... its a 44
The 44 will make more power and TQ.
Email me If I can help, I build these all the time for racers...
Art @ ACE
www.aircooledengineering.com |
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lostinbaja
Samba Member
Joined: December 19, 2004
Posts: 4036
Location: Frankfort, Illinois
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| Posted: Wed Feb 04, 2009 6:12 pm Post subject: |
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You would have to run the same size vents in the 44 as you would in the 40 which means they would be the same size carb in the end.
Run the 40IDF.
_________________
Jerry...
If it's being towed, it must be a trailer!
"Vee Grow Too Soon Oldt Und Too Late Schmardt"
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My photos
http://www.manxgallery.org/gallery/album92 |
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Art Thraen
Samba Member
Joined: January 19, 2004
Posts: 478
Location: Utah
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| Posted: Wed Feb 04, 2009 6:18 pm Post subject: |
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| If he is racing the 44IDF will make more power.. |
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Marv [UK]
Samba Member
Joined: January 07, 2009
Posts: 2225
Location: UK
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| Posted: Thu Feb 05, 2009 1:48 am Post subject: |
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| lostinbaja wrote: |
You would have to run the same size vents in the 44 as you would in the 40 which means they would be the same size carb in the end.
Run the 40IDF. |
No they wouldn't be.
Carb theory is complicated but a venturi chokes the incoming air which increases the velocity but reduces the pressure so as to suck gas through a jet and vapourise it in the air stream.
The real limiting factor is not the venturi but the carb body as it will only allow a certain amount of air flow at a given pressure. A 40mm body will not allow as much air to the venturi as a 44. This will restrict the amount of air for the given venturi to choke, which will comparatively reduce the intake velocity and the pressure differential in the smaller carb for the same revs. This will reduce the amount of gas sucked and the efficiency of the atomisation and the burn
a 32mm vent in a 44 is more efficient than in a 40 so the rev range and intake velocity will be different. |
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Art Thraen
Samba Member
Joined: January 19, 2004
Posts: 478
Location: Utah
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| Posted: Thu Feb 05, 2009 12:24 pm Post subject: |
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| Yep! and that means MO POWER |
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Jeff Gill
Samba Member
Joined: December 17, 2007
Posts: 77
Location: Dover,Pa
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| Posted: Thu Feb 05, 2009 3:01 pm Post subject: |
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| I guess im ordering a throatle shaft wright now! what size vents for the 44? it has 36 in it now |
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Art Thraen
Samba Member
Joined: January 19, 2004
Posts: 478
Location: Utah
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| Posted: Fri Feb 06, 2009 9:08 am Post subject: |
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| Try the 36s... |
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Jeff Gill
Samba Member
Joined: December 17, 2007
Posts: 77
Location: Dover,Pa
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| Posted: Fri Feb 06, 2009 7:09 pm Post subject: |
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| sounds good, just wondering would smaller ones make the power come in faster down low ? |
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Art Thraen
Samba Member
Joined: January 19, 2004
Posts: 478
Location: Utah
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| Posted: Sat Feb 07, 2009 7:21 am Post subject: |
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| Jeff Gill wrote: |
| sounds good, just wondering would smaller ones make the power come in faster down low ? |
I thought you said this was a RACE ENGINE? If so the 1000 to 3000 RPM will not matter
But I dought you will gain much down low but you sure WILL lose alot up top on the rpm..
If you want to experence the different carbs, Buy both to 40 IDF and 44 IDF set them up for single use, tune them and go drive around.. see which one works best for you.
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Art Thraen
Samba Member
Joined: January 19, 2004
Posts: 478
Location: Utah
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| Posted: Sat Feb 07, 2009 7:25 am Post subject: |
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These ZENITH 32 carbs sure run good!
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volken65
Samba Member
Joined: May 02, 2006
Posts: 171
Location: Palmdale, Ca
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| Posted: Sat Feb 07, 2009 10:40 am Post subject: |
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| Art Thraen wrote: |
These ZENITH 32 carbs sure run good!
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you're right about that... 
even on a 40hp
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Jeff Gill
Samba Member
Joined: December 17, 2007
Posts: 77
Location: Dover,Pa
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| Posted: Sat Feb 07, 2009 10:44 am Post subject: |
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| I should have said that my racing is through the woods and rocks and alot of low speed stuff with some areas of wide open sections |
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