Air Filter

Standard & electronic conversions

Air Filter

Postby midlandsmog » Wed Sep 24, 2014 6:52 am

Hi Everyone,

I'm wondering if anyone can help me regarding the most suitable air filter to fit to my Morris Minor. This is the final piece in the jigsaw before I hopefully get it on the road following a five year restoration project.

The car has 1275 (+60), 266 cam, hif 44, mini sport intake, 5 speed box and LCB exhaust. One of my objectives is to keep the car as quiet as possible. I understand the K&N filters cause significant induction noise; is this true? The decision therefore is what air filter assembly do I fit without a reduction in efficiency?

Thank you for any advice that can be offered.
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Re: Air Filter

Postby MM » Wed Sep 24, 2014 11:14 am

I currently use a Maestro 1.3 airbox, on a HIF44 SU, which works nicely - low induction noise, yet plenty of airflow:

viewtopic.php?p=56006
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Re: Air Filter

Postby Plin » Wed Sep 24, 2014 11:55 am

Welcome to the forum midlandsmog. Hope MM's answer helps as I don't have any answers to your query but it's great to hear your 5 year restoration is nearly finished :D .
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Re: Air Filter

Postby midlandsmog » Wed Sep 24, 2014 1:40 pm

Thank you for the warm welcome Plin.

Also thank you MM for your response and link to other post. I should have mentioned previously that I am hoping to find an air box with a similar appearance to the original air box fitted to the 1098 engine. It seems a shame to cover a nicely polished carb in plastic. I'm sure the 1098 air box will strangle the 1275 / HIF 44, does anybody have any tested ideas?

Also how noisy is the K&N setup? Is it considered unacceptable for long distance cruising?
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Re: Air Filter

Postby MM » Wed Sep 24, 2014 3:46 pm

Yes, pancake or K&N filters tend to drone on the motorway, which gets very wearying after a few miles!

You could fit one such as that fitted to Marinas:

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Re: Air Filter

Postby bmcecosse » Wed Sep 24, 2014 6:13 pm

The standard air cleaner box is hopeless for air flow - even with no filter inside! You will need to go with something larger. The MArina one above looks fine - I think some have also found Princess air cleaners work well. The K& N is very noisy. You could fabricate a trunking and fit a remote K & N on the LH side of the engine bay - but it's not going to be pretty. If you have the big valve head on your engine -it should go very well!
 









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Re: Air Filter

Postby MM » Thu Sep 25, 2014 5:42 pm

Indeed, the Austin Princess with the O-series engine had a HIF fitted, with a suitable airbox:

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Re: Air Filter

Postby midlandsmog » Fri Oct 10, 2014 6:26 pm

Just to say thank you very much for all your help.

I found a Morris 1800 air filter housing on eBay, it looks like this should fit following some minor modification.

Sorry it took so long to reply.
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Re: Air Filter

Postby Mainlander » Sat Oct 11, 2014 3:19 am

It does fit, I have one on mine. There is even a K+N filter element that will fit inside.
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Re: Air Filter

Postby midlandsmog » Mon Jan 19, 2015 12:12 pm

Hi Mainlander,

Thanks for your response. My restoration is finally at the stage I can look at getting the Airfilter installed. Would it be possible you could send a picture of how you got your Morris 1800 air box to fit? Also if you have the part number of the K&N filter element that be very helpful.

Thanks again.
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Re: Air Filter

Postby midlandsmog » Mon Jan 19, 2015 3:48 pm

I was just looking at air filters housings on eBay. It would be good if I could find one that needs no modification. Has anybody fitted an MG Midget 1275 housing? From the pictures it possibly looks small and may restrict when used singularly?

Thank you as always for any advice.
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Re: Air Filter

Postby bmcecosse » Mon Jan 19, 2015 8:49 pm

Far too small...... go with the earlier suggestions.
 









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Re: Air Filter

Postby Mainlander » Mon Jan 19, 2015 11:00 pm

Most of the modification to fit the filter box was done to the alloy plate that mounts to the carb. Mine is on a HIF 38 and the plate used is from a std 1098 air filter housing. The 1800 mounting plate has an angle that didn't help. The plate needed to be opened out to suit the carb openings and mountings. The threaded shaft needed the thread cut further down and the shaft shortened.
The element number E-3260. ( http://www.knfilters.com/search/product ... rod=E-3260 ) I found it doing a dimension search on the K+N website. 162mm OD, 127mm ID, 64mm H. The height would be better at 68mm but there was nothing available. Two rubber gaskets either side of the element fixed that and made for a firm fit.
01.jpg

02.jpg

03.jpg

It is close to the shock nut, 10mm. It has never touched.
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Re: Air Filter

Postby midlandsmog » Tue Jan 20, 2015 11:48 am

Thank you very much for the information and photos, really very useful indeed.

I will investigate further at the weekend.

Thanks again
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