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trevorg

Member Since: 28 May 2022
Location: Aisne
Posts: 51

2012 Defender 90 Puma 2.2 SW Indus Silver

On a LHD the cabin air intake and the engine air intake are both on the same side i.e the same side as the front passenger. 2012 90SW - 2.2TDCI

24th May 2024 2:29pm

Zed

Member Since: 07 Oct 2017
Location: In the woods
Posts: 3283

2010 Defender 110 Puma 2.4 XS CSW Santorini Black

blackwolf wrote:
HardCharger wrote:
For the Naka kit, there are also two types of entry into the vehicle, one is from the side intake and the other from the top of the wing where the fresh air vent to the HVAC is. Is there an advantage of one over the other?

If going with the wing type, what happens to the fresh air intake?

On RHD vehicles the cabin air intake is on the opposite side of the vehicle to the engine air intake so there is no problem using the wing-top hole for the latter. I'm not sure about LHD vehicles....

I haven't compared the pipework sizes between the two Nak options (wing-top vs wing-side) but if a pipe the size of my Nak wing-top system came out of the side it would make the vehicle wider to the extent I could envisage the pipe getting damaged, plus would (in my opinion look daft. The wing-top version looks aesthetically right to my eye, though clearly others may disagree.

The wing-top Nak system that I have uses a larger bore of pipework than any other RAI system I have seen, and this really does make a difference. It also is one of the few to provide a decent-quality and highly effective centrifugal pre-filter.

Exactly right when it comes to diameter. A while back I spent a bit of time testing different setups with a magnehelic gauge, although this was for a wing vent with no RAI. I found that a 90mm hose was far better than 73mm, which you would expect. However a 102 mm hose didn’t improve things further ,which I didn’t. I suspect this was either down to the limitations of the filter/airbox or size of pipework after it. WARNING.
This post may contain sarcasm.

24th May 2024 5:34pm

HardCharger

Member Since: 03 Mar 2013
Location: Manila
Posts: 735

2011 Defender 110 Puma 2.4 SW Stornoway Grey

blackwolf wrote:

On RHD vehicles the cabin air intake is on the opposite side of the vehicle to the engine air intake so there is no problem using the wing-top hole for the latter. I'm not sure about LHD vehicles....

I haven't compared the pipework sizes between the two Nak options (wing-top vs wing-side) but if a pipe the size of my Nak wing-top system came out of the side it would make the vehicle wider to the extent I could envisage the pipe getting damaged, plus would (in my opinion look daft. The wing-top version looks aesthetically right to my eye, though clearly others may disagree.

The wing-top Nak system that I have uses a larger bore of pipework than any other RAI system I have seen, and this really does make a difference. It also is one of the few to provide a decent-quality and highly effective centrifugal pre-filter.

The cabin air intake for the LHD vehicle is where the RAI intake will be installed, hence my question. Naka says they have a solution to relocate the fresh air intake for the cabin on the side where the old engine intake was located. Has a scoop like attachment with holes in the bottom of it to shed water, I reckon.

Looks like I will save up for the Naka wing top RAI then.

I wonder if fitting a Wolf-style side intake cover will hamper rather than help with cabin ventilation?

18th Jul 2024 5:08am

andy63

Member Since: 30 Jun 2023
Location: north east
Posts: 513

My thoughts and experience of fitting that snow/rain cover on the cabin air intake are that you need the fan on to get air to flow.. There is normally no natural flow without the fan.. But I have noticed now and again if I open a window, it must induce a bit flow as I can feel a bit warm air circulating without using the fan.. My observations anyway👍

18th Jul 2024 7:15am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17372

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

The warmth you feel with a window open may not be coming from the heater. On my (non-AC) double-cab, opening a window seems to result in a lowered cabin air pressure and hot air being drawn in through the floor panel gaps and past the handbrake lever, the air being heated by the engine and transmission. I guess that some must be drawn in through the heater as well (my heater has a "snow cowl" and consequently no air whatsoever enters via the heater with the windows shut and the fan off).

The cabin ventilation on a Defender, just like everything else on a classic Defender, is quirky and unpredictable and does not behave in a way which is intuitive. Once you learn its foibles it is quite acceptable, but it takes some experimentation to figure out what it does! So much more fun and character than a modern vehicle.

18th Jul 2024 8:31am

andy63

Member Since: 30 Jun 2023
Location: north east
Posts: 513

Yes it's definitely quirky.. I found it uncomfortable but two things have helped enormously..
No dpf😳... 🤣 And fitting one of the plastic deflectors that takes the hot air into the foot well..
Fitting the snow cowl definitely ment I always had to run the fan, but one day I noticed a warm air flow when the fan was off.. After a bit checking I realised I had the window down an couple inches.. I've got wind deflectors on and you don't really notice if it's only open by an few inches... Furthur playing confirmed that operating the window was altering the flow through the htr duct👍..I was rather surprised that the inside was as well sealed 🤣.. But I do use a bead of non setting mastic when the plates go back in👍
I'm pretty well used to it's quirks by now and can get quite comfortable👍🤣

18th Jul 2024 10:02am

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2414

2007 Defender 110 Puma 2.4 SW Chawton White

and the lack of side vents on the dash....That is something I do miss compared to other non-defender like models. Puma 110" SW

.............................................................
Earth first. Other planets later

18th Jul 2024 11:45am

trevorg

Member Since: 28 May 2022
Location: Aisne
Posts: 51

My truck does not have a/c. I fitted louvred wing top vents to the cabin air intake (and the drivers side for aesthetics) and find the air flow through the internal vents is greatly improved possibly because when driving air is forced in through the louvre rather than drawn in as is the case with the standard flush fitting wing top grille. This air flow increases with the window slightly open. 2012 90SW - 2.2TDCI

18th Jul 2024 3:25pm

jbcollier

Member Since: 29 Apr 2024
Location: Edmonton AB
Posts: 82

2009 Defender 110 Puma 2.4 SW Alpine White

I have the Naka relocated air intake on a LHD Puma. It basically switches the two air intakes providing a simpler, more direct air path for the engine intake. The HVAC intake does not work quite as well but it does work well enough. I have noticed no change in power or drive-ability but I’m still using the stock air box — shortly to be switched to an Alisport air box.

My motivation for the switch was to get rid of the factory snorkel and replace a busted up factory air box. In winter, the snorkel causes snow to build up obscuring part of the windshield.

18th Jul 2024 11:58pm

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