Outer Limits 4x4 Board

The standard exhaust manifold has a recirculation line back to the airintake. Some extractors have a connection for it and some don't. I understand that is there to recirculate the warm exhaust air when it is cold to maintain a constant temp air flow to the engine.

Is the connection important ?
Without it does it make it harder to start when cold?

I had no dramas without the fitting and tubing on my coily ... although i also live a bit further north than you aswell ..im sure some 1 down your way can confirm this ... for your colder weather and obviuosly they only pass the warm air back through once started so other than aiding warmup time im sure you wont have any extra dramas on start up


I did how ever have to re-fit this tubing and weld an attachment onto my extractors to get my zook passed and engineers certificate




Dan

i'm from melbourne and i didn't have problems really

my flexible tubing was all perished so i just blocked up the hole in the airbox

Mine needs the warm air when up in the mountains in winter, but otherwise fine.
mine don't connect directly to the manifold, it just hangs over that side a little.
christover

I needed one on cold damp nights as the carb would start to ice over (I was not getting the correct amount of hot water through the carb either, the plumping was a bit screwed up in that area)

Most time I could solve it by turning the snorkle head around, and on real cold nights I would have to disconnect the snorle at the air box.

you've got plenty of warm air chris.

sierrajim wrote:you've got plenty of warm air chris.

yep, sure have

PS mine is a 1.0 litre air box, I manually switch from "summer" to "winter" mode. Running on warm air setting disconnects snorkle, and air from under the bonnet is usually warm enough. I haven't got a pipe at the moment, it disintegrated, and its still running happy. christover

Living in Tasmania, I had to fabricate a hotbox after fitting a 32/32 Weber. The carb. would ice up when at any altitude in Winter. Air enters through a snorkel, then the Suzuki air filter then through a Fiat air cleaner with no element atop the Weber. I built an open-backed stainless box that clamps to the extractors. It has a short length of stainless tube welded to the front of the box over a cut-out hole and this connects to the hot air pipe running to the carb. It only works when the shutter is in the Winter position obviously. Icing is not an issue at crawling speeds, only when cruising at highway speeds. It works a treat!

I reckon that you won't have a problem unless you have a snorkel. Most of our cars down here in Melb aren't running it.

I have a snorkle.

Sounds like I should try and find extractors with a connection.

Does anybody know a brand that does have a warm duct connection?

troyster wrote:I have a snorkle.

Sounds like I should try and find extractors with a connection.

Does anybody know a brand that does have a warm duct connection?

any exhaust shop can tack on a bit of tube to stick the pipe onto...mine has one, was on it when I bought em..ya can just see it in top of this photo
I just hang mine over that side, it don't need to be real close to heat, just works better on the warmer side.
christover

youll find that you will have a touch less power with it connected, but far better fuel consumption.

hey troyster
hows it going

its called a stove pipe
it stops the carbys venturi from freezing up at constant road speed (freeway) running etc during cold winter days

it would be important if
if your carby plays up on cold days
rego/blue slip time (but mostly overlooked)

it will not affect start ups
will only affect carby when at constant road speeds
eg wouldnt affect city driving - mainly open roads

ps the stove pipe system doesnt recirculate exhaust gases
the carby just sucks the hot air from around the manifold

dont buy new extractors
make a heat sheld over the manifold to collect hot air
OR
just drop into a local exhaust shop & thay can weld on a bit of left over pipe onto your manifold/extractors
& buy the stove pipe from repco/auto one/ peps etc around $20.00


cheers
daryl

we don't have blue slips down here, but it is a RWC item,
my pipes didn't have one so we just welded a bit of tube on there.
I could never see the sense in putting a cardboard tube under the bonnet of a 4x4
Peter.

troyster wrote:The standard exhaust manifold has a recirculation line back to the airintake. Some extractors have a connection for it and some don't. I understand that is there to recirculate the warm exhaust air when it is cold to maintain a constant temp air flow to the engine.

Is the connection important ?
Without it does it make it harder to start when cold?

if you need a bit of tube welded on to your manifold, i'm in the western suburbs and i'd be happy to help out