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gbmoto



Member Since: 06 Jan 2010
Location: West Sussex
Posts: 21

United Kingdom 
3.9 efi Air Box mount
Hi All

Recently bought this 90 with a RR 3.9 efi.



Click image to enlarge



Generally well done but a few bits I want to change.

One is the air filter, currently it has a K&N which I am going to replace with a modified standard RR box in the same position as a 50th Anniversary/NAS, so behind the engine mounted on the bulkhead.

Does anyone have a picture of the mount without the air filter attached please?
Post #929209 9th Nov 2021 12:01pm
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Lodelaner



Member Since: 04 Feb 2010
Location: Lambourn
Posts: 573

United Kingdom 1988 Defender 90 V8 Petrol ST Shire Blue
Hi - I've done the same conversion. The air filter has a collar that goes around the neck and mounts to a bracket on the back of the engine using either a plain bolt/nut or cotton reel rubber buffer jobs.

I know some people fix it to the bulkhead, but it's easier/neater not to.

I haven't got a photo without the air box - but I can take some photos when I get the Landy out next.


Click image to enlarge



Click image to enlarge
 JB

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Post #929976 16th Nov 2021 4:10pm
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gbmoto



Member Since: 06 Jan 2010
Location: West Sussex
Posts: 21

United Kingdom 
That's a nice install Lodelaner.

I was reckoning on cutting and rewelding the filter to "straighten" it, but I see you have rotated yours, deffo stealing that idea!

I guess you pick up on the engine lift bracket bolt holes?
Post #929978 16th Nov 2021 4:40pm
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Lodelaner



Member Since: 04 Feb 2010
Location: Lambourn
Posts: 573

United Kingdom 1988 Defender 90 V8 Petrol ST Shire Blue
I can’t remember which bracket it goes onto (brain fade)! I’ll get that photo for you 👍 JB

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Post #929979 16th Nov 2021 4:47pm
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Lodelaner



Member Since: 04 Feb 2010
Location: Lambourn
Posts: 573

United Kingdom 1988 Defender 90 V8 Petrol ST Shire Blue
Thx for the kind comments. Yours looks good- I like the doors and wheels (my next 2 jobs).

Ah yes, using the kink in the air box inlet (from a flapper EFI) means the airflow meter clears the heater box and you don’t need a complex up and down air intake pipe from a NAS. Mine uses a combination of the D1 V8 intake and regular intake pipe from the flapper V8 going into the plenum. JB

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Post #929980 16th Nov 2021 4:52pm
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gbmoto



Member Since: 06 Jan 2010
Location: West Sussex
Posts: 21

United Kingdom 
Ta muchly, useful info, a lot simpler than my original plan!

I like simple Very Happy

I have had a look at your 90 in your gallery, it is sooo nice, ironically I want to go with Wolf's and 235's ultimately. It came with the 265 BFg's on eight spokes so swopped them to the freestyles for a sort of NAS/50th look.

Also plan to de-chequer plate it over time.
Post #929981 16th Nov 2021 5:03pm
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Romadog



Member Since: 07 Jul 2011
Location: Powys
Posts: 1740

Bracket is one shown below. NLA at JLR and only on V8 engined 50th Anniversary vehicles in this country.

http://new.lrcat.com/#!/1228/20326/20390/1554
Post #930658 22nd Nov 2021 10:25am
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gbmoto



Member Since: 06 Jan 2010
Location: West Sussex
Posts: 21

United Kingdom 
Many thanks Romadog, much appreciated.
Post #930660 22nd Nov 2021 11:15am
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gbmoto



Member Since: 06 Jan 2010
Location: West Sussex
Posts: 21

United Kingdom 
Well finally got this fitted. big alloy plate bolted to the engine lift plate holes.


Click image to enlarge


Still a fair bit of tidying but runs a lot nicer and quieter.

Fast tickover to start with until I found the throttle cable had been adjusted up to "correct" a low tickover caused by the K&N Laughing

Will connect up the laptop again soon and see how things look now.
Post #953105 21st May 2022 4:54pm
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Van Diesel



Member Since: 12 Oct 2013
Location: Suffolk
Posts: 110

United Kingdom 1986 Defender 90 V8 Petrol PU Auto Shire Blue
I bought mine with a K&N already fitted. Whats the main benefit of switching back to a RRC intake?
Post #954219 31st May 2022 7:40pm
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Lodelaner



Member Since: 04 Feb 2010
Location: Lambourn
Posts: 573

United Kingdom 1988 Defender 90 V8 Petrol ST Shire Blue
Probably not worth switching back.

They do create more induction noise (allegedly), can contaminate the MAF / hotwire and need oiling.

I just junked one off my D2 and went back to paper. JB

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Post #954241 31st May 2022 9:59pm
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Van Diesel



Member Since: 12 Oct 2013
Location: Suffolk
Posts: 110

United Kingdom 1986 Defender 90 V8 Petrol PU Auto Shire Blue
Fair enough, I've just cleaned and re oiled this one but it seems to have dried out quickly with all the heat generated under the bonnet.
Post #954242 31st May 2022 10:04pm
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gbmoto



Member Since: 06 Jan 2010
Location: West Sussex
Posts: 21

United Kingdom 
In the case of mine the engine hadn't been set up properly for it, runs much nicer now and noticeably quieter.
Maybe slightly less powerful but a tweaked 3.9 in a soft top 90 still is plenty zippy Very Happy
Post #954272 1st Jun 2022 8:41am
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MercianRover



Member Since: 07 Apr 2022
Location: Culworth
Posts: 91

United Kingdom 1998 Defender 110 300 Tdi CSW Java Black
The oil from the K&N gets inducted as a mist, coats the hotwire sensor and degrades it's performance.

Also a K&N is a very poor filter, better off retaining the paper element and keeping the inside of the engine grit free. The "performance" benefits of the K&N are negligible.
Post #955551 15th Jun 2022 9:42am
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Van Diesel



Member Since: 12 Oct 2013
Location: Suffolk
Posts: 110

United Kingdom 1986 Defender 90 V8 Petrol PU Auto Shire Blue
Yep, I've umm'd and ah'd over K&N filters for decades with a multitude of vehicles and never gone down that route.
This was on when I bought it. It was clogged up and very dirty. I cleaned and re oiled. Is it possible the new oil has got onto the wire on the MAF and causing the problem? Bit delicate to clean the wires I believe even with carb cleaner?
Post #955642 15th Jun 2022 9:53pm
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