Ivan Dickson

iTrader: (32)

Could someone shed some light on the difference between conical & non conical manifold's, any input is appreciated.

garen

iTrader: (7)

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

Ivan Dickson

iTrader: (32)

Thanks...

max_chen

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.

novarossi OZ

iTrader: (3)

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

Ivan Dickson

iTrader: (32)

Thanks for all the feedback Now I have a better understanding of the the two....

CraigX

iTrader: (34)

Anyone have part numbers for .21 non conical onroad headers?

Team Kamikaze

iTrader: (3)

41015 = short
41016 = medium
41017 = Long
Above are Nova Rossi part numbers.

Ivan Dickson

iTrader: (32)

What is the difference in performance between short med & long?

JayL

short=high rpm hp

long=low rpm hp

Ivan Dickson

iTrader: (32)

So Med. is a Little of both short & long wrap in to one....?

JayL

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

Ivan Dickson

iTrader: (32)

That make sense...... LOL

JIM1

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

Roelof

You do mean fins?

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