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Old 11-08-2009, 10:50 PM   #1
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Default nova 21-4 engine with jp4?

anyone tried a nov 21-4 buggy engine with a jp4 pipe?whats it like for power, fuel runtime??
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Old 11-09-2009, 01:04 AM   #2
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Good power, only loses a couple of meters on the pit straight. Smooth power delivery. With a 6.5mm venturi I've done 8.5mins
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Old 11-09-2009, 06:37 AM   #3
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Originally Posted by Chris-s View Post
Good power, only loses a couple of meters on the pit straight. Smooth power delivery. With a 6.5mm venturi I've done 8.5mins
just curious what your temps were like w/full&almost empty tank with +4-jp4?
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Old 11-09-2009, 08:55 AM   #4
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I run around 220-240F.

I try to make sure the engine is up to temp before it goes out on track.
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Old 11-09-2009, 10:16 AM   #5
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Seriously? That thing must ba a gas hog to only get 8.5 minutes with a 6.5mm insert. I was considering buying a +4 but that scares me

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Good power, only loses a couple of meters on the pit straight. Smooth power delivery. With a 6.5mm venturi I've done 8.5mins
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Old 11-09-2009, 10:30 AM   #6
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i noticed and thought the same thing. better matched pipe will surely push 10min
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Old 11-09-2009, 11:44 AM   #7
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Seriously? That thing must ba a gas hog to only get 8.5 minutes with a 6.5mm insert. I was considering buying a +4 but that scares me
I swear the topic said 21-5 this morning !

A few people I race with use the 21-4 and can get 10mins, some can't get it consistently (you really need to be 10.30 or more to be safe) so have gone with the OS
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