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01-22-2007 07:22 PM  10 years agoPost 1
sla

rrApprentice

wasilla,ak,99654

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i was just wondering if anyone has used the viper head on a os 91? and if you had what is it like compared to a regular head. was there any difficulty tuning or running that thing. and was there a power difference at all?

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01-22-2007 09:12 PM  10 years agoPost 2
rada70

rrKey Veteran

Westchester, NY

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you will notice a smoother running engine. you also might notice a little extra power. it's a plus if you are running the cline system.

Just do it.

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01-22-2007 10:13 PM  10 years agoPost 3
javen13

rrNovice

Long Island,NY-USA

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I run the dual plug viper head with a kline and it runs great. Good power and very smooth. I can't tell you how much power compared to the stock head becasue I never ran it. I've barley touched the needles since I put the motor in so I would say it's easy to tune.

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01-22-2007 11:43 PM  10 years agoPost 4
Dr.Ben

rrMaster

Richmond, VA, USA

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Functionally you may end up with more power because the needles stay consistent and, therefore, you can needle the engine close to max power without as great a fear of it going unexpectedly lean.

You WILL gain power if you do the big bore modification along with the Cline mod in the case of the C-Spec carb. The SZ carb is already very close to the size of the big bore and thus doesn't need to be bored.

Ben Minor

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01-23-2007 01:16 AM  10 years agoPost 5
sla

rrApprentice

wasilla,ak,99654

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cool. i was worried about the ease of tuning part. i am fairly new to nitro helis so i still worry about the engine dying in flight. i have been using my ttr 50 in my raptor and it has been easy to tune so far.......

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