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Old 02-10-2009, 06:00 PM   #1
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Default OS speed restrictor?????

what restrictor do most of you run in this engine?
Thanks in adavance
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Old 02-10-2009, 06:14 PM   #2
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Depends on the power and run time you need. I don't usually run anything bigger than 7mm. More often than not, I use a 6mm, occasionally I'll use a 6.5 or 5.5.
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Old 02-11-2009, 12:12 PM   #3
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I'm glad I found this topic and did not have to make a new one

I just got my first .21 OS engine and its the standard V-spec VZ-B. It comes with 21J carb and 8mm/9mm restricters (red and blue).

From the new O.S. Speed .21 VZ-B V-Spec II 08/09 Worlds Edition spec I found that it includes: 7mm, 6.5mm and 6mm carburetor restrictors with Red anodized finish are supplied with the engine as standard equipment.

What's the carb on the new V-Spec II Worlds Edition? How does the engine differ from standard V-spec VZ-B with 21J carb?

I'm just wondering why the VZ-B uses 9/8mm and the V-Spec II includes 7-6mm restrictors? Are the engines so different or can you use the 7-6mm restrictors on standard VZ-B ?
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Old 02-11-2009, 12:45 PM   #4
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Quote:
Originally Posted by lauri View Post
I'm glad I found this topic and did not have to make a new one

I just got my first .21 OS engine and its the standard V-spec VZ-B. It comes with 21J carb and 8mm/9mm restricters (red and blue).

From the new O.S. Speed .21 VZ-B V-Spec II 08/09 Worlds Edition spec I found that it includes: 7mm, 6.5mm and 6mm carburetor restrictors with Red anodized finish are supplied with the engine as standard equipment.

What's the carb on the new V-Spec II Worlds Edition? How does the engine differ from standard V-spec VZ-B with 21J carb?

I'm just wondering why the VZ-B uses 9/8mm and the V-Spec II includes 7-6mm restrictors? Are the engines so different or can you use the 7-6mm restrictors on standard VZ-B ?
The standard VSpec has plastic inserts. The Speeds have the aluminum red inserts and they fit the regular VSpec carb. The JX21 has the same aluminum inserts as the Speed, just different color.
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Old 02-11-2009, 02:35 PM   #5
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But how come V-spec has 9/8mm but the Speed has 7/6mm? Are the motors so different that one uses 2mm bigger restrictors or you can easily use 7/6mm restrictors on standard V-spec also?

I belive that smaller restrictor makes the tuning more critical. Maybe that's why V-spec has bigger ones so that people can get the motor into tune?
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Old 02-11-2009, 02:53 PM   #6
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I've ran the 6mm 90% of the time...

the restrictor doesnt effect how, easy or hard, it would be to tune at all.... thats up to the goof ball with the screwdriver
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Old 02-11-2009, 04:01 PM   #7
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The difference between the two motors having different restrictors is easy the os speed is a way powerfull engine and does not need such a big restrictor and can use quite a small one and still have plenty of power .The V spec is still a powerfull engine but can take a bigger restrictor .I run a 5.5 in my spec and it has plenty of power and i get about 9 minutes of run time .
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Old 02-11-2009, 04:18 PM   #8
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I ran the 8mm in my V-spec and got 7-8 minutes all day.
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Old 02-12-2009, 05:07 PM   #9
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Of course it depends on the track but my goal would be to drive 10minutes with T-2060 pipe. If the heatss are 10min or semis 20min then you have to be able to drive 10min stints if other guys can do it

I've tried 5.5mm with 28XZ engine and 21J carb and it really lacked power for my truggy. It was impossible to drive with it.
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