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Old 01-06-2009, 04:06 PM   #1
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Questions?? Conical and Non conical Manifold's

Could someone shed some light on the difference between conical & non conical manifold's, any input is appreciated.
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Old 01-06-2009, 04:17 PM   #2
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In general, or at least based on my experience with both:
conical = more power, decreased fuel mileage
non conical = less/smoother power, increased fuel mileage
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Old 01-06-2009, 04:25 PM   #3
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Quote:
Originally Posted by garen View Post
In general, or at least based on my experience with both:
conical = more power, decreased fuel mileage
non conical = less/smoother power, increased fuel mileage
Thanks...
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Old 01-06-2009, 07:22 PM   #4
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Quote:
Originally Posted by garen View Post
In general, or at least based on my experience with both:
conical = more power, decreased fuel mileage
non conical = less/smoother power, increased fuel mileage
but for conical type,i used report was low end power ok but middle to top rpm was slowly than non conical.
if you make a correct non conical manifold with muffler combo,that it has give you smile feeling.
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Old 01-07-2009, 03:50 AM   #5
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Conical manifold--- have a tapered dia inside= smother power, more torque,

Non conical manifold --same dia straight through, more top end power with little loss in bottom end.

regards Aaron
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Old 01-07-2009, 07:24 AM   #6
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Quote:
Originally Posted by max_chen View Post
but for conical type,i used report was low end power ok but middle to top rpm was slowly than non conical.
if you make a correct non conical manifold with muffler combo,that it has give you smile feeling.
Quote:
Originally Posted by novarossi OZ View Post
Conical manifold--- have a tapered dia inside= smother power, more torque,

Non conical manifold --same dia straight through, more top end power with little loss in bottom end.

regards Aaron
Thanks for all the feedback Now I have a better understanding of the the two....
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Old 01-08-2009, 12:25 PM   #7
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Anyone have part numbers for .21 non conical onroad headers?
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Old 01-08-2009, 01:00 PM   #8
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41015 = short
41016 = medium
41017 = Long
Above are Nova Rossi part numbers.
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Old 01-08-2009, 02:32 PM   #9
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Questions??

Quote:
Originally Posted by Team Kamikaze View Post
41015 = short
41016 = medium
41017 = Long
Above are Nova Rossi part numbers.
What is the difference in performance between short med & long?
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Old 01-08-2009, 02:57 PM   #10
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short=high rpm hp

long=low rpm hp
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Old 01-09-2009, 09:19 AM   #11
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Quote:
Originally Posted by JayL View Post
short=high rpm hp

long=low rpm hp
So Med. is a Little of both short & long wrap in to one....?
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Old 01-09-2009, 03:40 PM   #12
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medium has less bottom-end than long and more top-end than long

medium has more bottom-end than short and less top-end than short

yep in -between

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Old 01-09-2009, 04:20 PM   #13
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Quote:
Originally Posted by JayL View Post
medium has less bottom-end than long and more top-end than long

medium has more bottom-end than short and less top-end than short

yep in -between

That make sense...... LOL
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Old 01-09-2011, 04:11 AM   #14
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I know this an old thread but what effect does it have on an engine if you alter the amount of 'rings' on a manifold? Does this have any relation to the length?

Thanks
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Old 01-09-2011, 04:44 AM   #15
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You do mean fins?

The number of fins on a Novarossi manifold is determing the length.
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