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Old 12-27-2008, 09:26 AM   #1
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Default Carb Venturi

I just put a new engine in my truck, the engine came with two venturi sizes.
I don't know the function of the venturi? Should I have one in my carb? The engine runs great with out them, will they improve Hp?
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Old 12-27-2008, 09:34 AM   #2
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they increase fuel mileage...

racers use them to stretch out their pit window times.
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Old 12-27-2008, 09:43 AM   #3
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These ae the best carb inserts on the market IMO.




http://www.amainhobbies.com/product_...oducts_id/7118
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Old 12-27-2008, 09:57 AM   #4
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Originally Posted by skeller View Post
These ae the best carb inserts on the market IMO.
http://www.amainhobbies.com/product_...oducts_id/7118
Not trying to argue but I keep hearing that alot so I will ask, what makes them better than an os speed insert?
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Old 12-27-2008, 10:11 AM   #5
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Quote:
Originally Posted by jbrow1 View Post
Not trying to argue but I keep hearing that alot so I will ask, what makes them better than an os speed insert?
I've looked at a few O.S. inserts....I believe that the taper at the top of the IDRC insert is more rounded than the O.S. I haven't measured and compared the two against each other. I think the more rounded top reduces air disturbance going into the carb...which should make the air velocity increase....which should make for better fuel atomization and better fuel efficiency.

But....as I said...I haven't done and in depth comparison of the two.
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Old 12-27-2008, 10:21 AM   #6
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Since we are on the topic, I thought Id ask the size difference of these carb restrictors. Which will give more run tine 7mm 8mm or 9mm?
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Old 12-27-2008, 10:31 AM   #7
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it also depends on the pipe you are running to in all my engines i run the 8mm insert and os 2050 pipe on one ninja and the fuel mileage is about 12 mins of run time. the other ninja i run the long header and ninja pipe and get about 11 mins of run time and that is in a truggy engine is still new too. thanks nate
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Last edited by mungen; 12-27-2008 at 10:49 AM.
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Old 12-27-2008, 10:36 AM   #8
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Quote:
Originally Posted by skeller View Post
I've looked at a few O.S. inserts....I believe that the taper at the top of the IDRC insert is more rounded than the O.S. I haven't measured and compared the two against each other. I think the more rounded top reduces air disturbance going into the carb...which should make the air velocity increase....which should make for better fuel atomization and better fuel efficiency.

But....as I said...I haven't done and in depth comparison of the two.
Thanks for a good answer rather than a "it just is." : )

Omar, generally the smaller insert will give you a better fuel mileage. But going to small will defeat the purpose as you will end up going full wood more and waste fuel.
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Old 12-27-2008, 12:56 PM   #9
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The IDRC inserts are total different from all others made.
They are 4mm taller.
The upper taper is greatly reduced, so upper intake pressure is much less.
They are of a straight bore design with less taper for increased air volume and velocity.
Bore size is true to the number, not close as others.

By having all of these designs in one venturi we are able to achieve greater throttle response at low RPM without losing the top end power when using a small venturi.
The engine holds a better tune due to a more stable air flow, and fuel mileage increases.
The 8mm will give the maximum amount of power an engine can deliver.
The 7mm is the best of both worlds, bottom and top.
The 6mm gives maximum bottom and mid response, great top end. It is recommended for modded and all high output engines, smoother and more controlled power.
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Old 12-27-2008, 08:42 PM   #10
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Quote:
Originally Posted by Ralph Walters View Post
The IDRC inserts are total different from all others made.
They are 4mm taller.
The upper taper is greatly reduced, so upper intake pressure is much less.
They are of a straight bore design with less taper for increased air volume and velocity.
Bore size is true to the number, not close as others.

By having all of these designs in one venturi we are able to achieve greater throttle response at low RPM without losing the top end power when using a small venturi.
The engine holds a better tune due to a more stable air flow, and fuel mileage increases.
The 8mm will give the maximum amount of power an engine can deliver.
The 7mm is the best of both worlds, bottom and top.
The 6mm gives maximum bottom and mid response, great top end. It is recommended for modded and all high output engines, smoother and more controlled power.
Again thanks for the answer. I will buy some this summer and try them out. Sounds great and I've read alot of good stuff about them already. I have speed inserts now but will try these in the summer. : )
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Trackstar & Hobbywing esc's
Spektrum radios, GensAce batts, turnigy servos.
Keeping racing fun and affordable with my 8y.o. twins :)
The best track I've raced is the one in my backyard!
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