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Old 06-25-2007, 02:30 AM   #16
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Originally Posted by wothrottle View Post
how do you adjust that screw?

if you insert a smaller venturi for example,what to do with that needle.
If you put a smaller venturi, what you would need to do is to screw-in the brass and relocate the spraybar near at the center of the smaller circumference that leaves the insert.

This will modify your LSN needle, so you will need to adjust it accordingly. The same goes for bigger inserts, but maybe you will want to un-screw it.
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Old 06-25-2007, 06:30 AM   #17
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Lean HSN

Less air = Less fuel

What? Leaning out gives you more power. Leaning it too much will give you a 400 F degree engine.

To calm the engine down, you need to restrict the air coming it.
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Old 06-25-2007, 06:45 AM   #18
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What? Leaning out gives you more power. Leaning it too much will give you a 400 F degree engine.

To calm the engine down, you need to restrict the air coming it.
He was replying to the post above that. The guy asked "When I am going to the smaller inserts, which way should I adjust my tune?"

And he is correct with his answer.

Using a carb restrictor robs the engine of air. So in reality you just richened the engine by installing the restrictor. So you "must" lean it out.
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Old 06-25-2007, 07:09 AM   #19
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yep, I re-read the first post. Having come back from Monster Madness and being in the sun ( and rain) for 3 days straight, my brain is a little foggy right now.
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Old 06-25-2007, 09:37 AM   #20
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small carb insert, turn in the mixture screw,right?!

but generally,is there a way to tune this screw with a shematic,like the pinch test for the lsn?
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Old 06-25-2007, 09:41 AM   #21
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small carb insert, turn in the mixture screw,right?!

but generally,is there a way to tune this screw with a shematic,like the pinch test for the lsn?
When you go from a carb with no insert to a carb with an insert, you're going to have to lean it. Tune by speed, smoke and you're gut feeling. Then break out the temp gun.

I don't understand you're second question.
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Old 06-25-2007, 12:24 PM   #22
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leaning is o.k. but how should I handle the mixture setting screw, is there also a test like the pinch test for the lsn?

when I understand you right, I have to screw in the mixture screw when installing a smaller carb insert,right
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Old 06-25-2007, 12:33 PM   #23
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Just throw it in there & tune the motor like you always do when you get to the track. It's not rocket science. I'm running the C6 in the 8 with a 6.5mm restrictor,198 header & 2045 pipe. Works just fine.
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Old 06-25-2007, 12:34 PM   #24
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Originally Posted by wothrottle View Post
leaning is o.k. but how should I handle the mixture setting screw, is there also a test like the pinch test for the lsn?

when I understand you right, I have to screw in the mixture screw when installing a smaller carb insert,right
Before we go any further, how many needles are on your engine? Is it 2 (hsn, lsn) or three (hsn, lsn, spray bar)

When installing *any* carb insert, you have to lean the engine a little bit.
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Old 06-25-2007, 12:38 PM   #25
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3 screw os vspec carb and eingine.my question is, how to tune the spraybar needle correctly
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Old 06-25-2007, 12:40 PM   #26
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OK, I have no experience with those engines. I'm a gas truck guy. I heard that you leave those needles alone. Maybe someone else could help you with that.
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Old 06-25-2007, 12:42 PM   #27
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Found this, hope it helps:

http://www.chitownrc.com/showthread.php?t=3325
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Old 06-25-2007, 12:52 PM   #28
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I use the OS V-Spec with the smaller insert. All I ever did was retune the engine so it runs right using only the HSN and adjusting the LSN if necessary. I never touched the spraybar at all and the engine runs great.
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Old 06-25-2007, 01:02 PM   #29
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do you also tested the big insert?what do you recommend?

I only ran the engine for 1/2 gallon and only used the small insert. but now after running in the tuning seems off.
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Old 06-25-2007, 02:30 PM   #30
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The O.P. has a C6 which is a 2 needle carb.
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