NA manifolds and their designs....

[CMF_GTRHOLIC]

Hi all, i was wondering if anyone could tell me what the difference in designs meant when it came to manifolds and what effects it had on the drivability of the car. Im interested in particular the part where the pipes group together, eg, 4-2-1 etc. and which is the best to have for race, street etc.

 

[CMF_GTRHOLIC]

march n2 race manifold

 

[CMF_GTRHOLIC]

another shot of grouping point

 

[CMF_GTRHOLIC]

is it really the longer the better?

 

[CMF_GTRHOLIC]

wierd!

 

[CMF_GTRHOLIC]

nismo race exhaust and manifold

 

[CMF_55bhp is more than enough]

no 5 is a turbo manifold. ive just got a maniflow manifold which is 4-2-1 apparently better for power and 4-1 is better for mid range torque (dont quote me on this as it may be the other way around)some of those look very tasty.

 

[CMF_55bhp is more than enough]

oh and all bar the top one is 4-1 thats why they look so long

 

[CMF_kneival]

#5 is a N/A cube manifold im sure of it.

Yey for maniflow, lol.

I guess the 4-1 must be good if nismo and N2 cars have them...

 

[CMF_kneival]

http://www.dcsports.com/faq.asp?tid=5

In many cases 4-1 headers are designed for racing applications where the vehicle is being driven at or near redline. The 4-1 design maximizes top end power, whereas the 4-2-1 evenly distributes it throughout the power band. There are cases where a 4-1 header works better than the 4-2-1 and in those cases we use this design.

 

[CMF_Polar]

yes number 5 is cube na manifold, or aftermarket na manifold for aircon k11 or those wanting to keep primary cat.

 

[CMF_Polar]

actually i've seen cube manifolds and they look different to that, more like standard k11 manifold but with short split into 4 primaries and back into one just before going to cat. also that one looks a bit diy with the welds on and things.

 

[CMF_makes]

Hi "GTRHolic",

Cisco has actually written up an excellent article on this topic with some real life dyno results.

http://www.micra.com.au/community/events/melb-dyno-day.php

 

[CMF_lewis]

no 5 pic comes from cga3 alpha 101ps engine ...
i some pic on gtr's topic and u can find out !!

 

[CMF_Polar]

oh i was wrong then. maybe the normal cube manifold is different to that? i remeber seeing shorter seperate primaries.

 

[CMF_kneival]

Ah right I thought the Cube had the 101ps engine in it?

 

[CMF_Yom]

the z10 cube alpha spec (there's about 4 alpha specs I 've found, dunno which one though) comes with the 101hp CGA3DE.

All the other jap k11 and vanilla z10 have the normal ~80hp CGA3DE.

As far as I know, thats what i've gathered from lewis and my searches on countless japanese websites.

I have also found that the CGA3DE's seem to be quite popular in japan, and that the 101hp alpha specs always fetch a pretty penny and have a rather large bid war when featured in auctions.

 

[CMF_lam.666]

does anybody have pics of australian made 4-1 headers and where i can get them from plus price

cheers

edit: what type of 4-1 extractors was trev using on the melb dyno day?

 

[CMF_Yom]

AFAIK there arent any. Hurricane had some 4-2-1's for micras without aircon in last years catalogue but I wouldnt be suprised if they stopped making them.

 

[CMF_lam.666]

thanks Yom, does anybody know why on the 4-1 design the 1st and 4th cyclinders pipes are situated on top in the collector?

 

[CMF_makes]

Hi Yom,

The 4-2-1 Hurricane headers are definately still available... I bought some recently.

They cost $400 and can be ordered through any good exhaust place or direct from the manufacturer "Liverpool Exhaust". These are excellent quality extractors (they even come pre-painted in blue heat resistant paint)... They make a big difference and I am very happy with them !.

Please note, these "off the shelf" hurricane extractors only fit cars without aircon...

Hi LAM... if your car has aircon and/or if you have your heart set on 4-1 extractors you will need to have some custom made... or purchase from Japan (eg. http://www.japanparts.com/db/partslist.php?dealer=5&car=87&middlesmall=&maker=&volkey=)

There's no particular reason why the 1st & fourth pipes are at the top of the collector except for neatness and convenience during construction.

 

[CMF_lam.666]

thanks makes,

with your headers you just got, do you know what the diametre of the tubing was used.. a guesstimate would be fine

1 1/4 inch or 1 /1/2 inch?

cheers

 

[CMF_Snoopy]

My hurricane headers are sitting on the floor at work. I will measure them tommoro.

 

[CMF_lam.666]

thanks snoopy!

 

[CMF_jamm'n]

I've got 4-1 headers (custom) and i love them :-D
I'm almost certain that they where made this way because it's easier to fabricate lol. But i recon there great.

 

[CMF_lam.666]

hey jamm'n, who made your headers and how much did they cost? My gf bought a new car and i have taken over her super s, time for some upgrades.

jamm'n whats the diameters for your custom 4 - 1?

 

[CMF_Snoopy]

The pipe diameters for hurricanes are
1.5in off the head to the first collector. After that they go to 1.75in down to the 2nd collector/merge. Then it's out to 2.25in.

 

[CMF_lam.666]

thanks snoopy,whats the quality like on the hurricans? are they mild steel or stainless?

cheers

 

[CMF_Snoopy]

There only mild steel. Qualities reasonably good, considering the price. They worked great on mine the only reason that I took them off is because Im going turbo. However they are really only suited to a mild n/a tune. If you want some serious n/a power then I would look else where (like impul)

 

[CMF_Pyro]

and what about janspeed? Heard different stories about them. Im looking for a 4-2-1 manifold and will go for a mild n/a setup. So hurricanes will be a good choice I guess. Or are there any other options?