Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) +8 K&N air filter

I want to fit a K&N air filter to my +8 and have been told I should use the cone type K+N as the element type isn’t worth having. Does anyone have a part number or know where to obtain one from please?

I removed the cannister and fit one of these universal filters
https://www.ebay.co.uk/itm/RG-1001R...46890.l49286&mkrid=710-127635-2958-0

To be honest, I think any brand would do.

The problem with the original air filter is the single small bore inlet to the "cannister" . It is great for developing torque for 2 to 3 ton SUVs but it does restrict the ability of the engine to rev quickly , which is much more important in a sports car.

A simple cone type filter like K&N , JR , or other are fine , just make sure that you clean and oil them annually (K&N sell a cleaning and re-lubing kit) The other alternative is a "foam" type , these tend to be favoured by the racers, and are cleaned simply by washing in water plus detergent.

I know I had to make a couple of modifications to the "stub" where it attaches to the air mass sensor , so the new filter would fit , but this was not difficult.

The other task you might like to consider is support , the canister is supported in 2 places , removing it and fitting a new filter without support can lead to vibration, mine is mounted on a small bracket which utilises the holes already drilled in the bulkhead for the canister mounting nearest to the air mass sensor.

Thanks guys - model RG-1001 ordered from K&N - even available in blue to match my hose colour RG-1001BL! I'm not expecting any noticeable power increase but rather a more trick appearance in the engine bay.

A cold air feed to the filter would be worth doing as well as the K&N. Colder air flowing through the free flow filter gives two small improvements. A rough guide is 7deg lower temp gives about 1-2% power boost. Very small but you might feel a response.

Over 10 years ago I was playing with the air in take on my 94 +8, I took off the trumpet and put on a K&N open ended filter but didn't want it exposed to the engine heat. I removed the trumpet part from the canister and reverse fit over the filter, then I put the 2 inch hose from below the frame up to the filter housing for cold air. Before this modification I did a rolling road test after the mod carried out another test and found a 5% increase. Many thousands of miles later in all weathers I have had no issues.

That is quite cool britmog. (PUN!) BTW, by removing the trumpet nose you also eliminated an inherent blockage that dealer supplier K&N filters create. Have you ever looked at the gomog article here? https://www.gomog.com/allmorgan/art3.html (scroll down to air filters) They use the K&N previously use with the Flapper EFI holder (looks like a American football helmet). The holding plate blocks the air flow. When the factory gave me a polished stainless trumpet holder (they knew I am a sucker for shiny metal). However, when testing for other things, I noticed MY bhp had dropped 6%!! The pictures in the article show why, The Flapper K&N filter in a Hotwire holder blocks air.

I found a small K&N with more air flow and fit it instead...I went right back up to the football helmet figures.

Well done fella

Lorne

It's not the prettiest of set ups but is functional, I live in a very dusty environment (2 miles of steep dirt track to hard top road) and was concerned about dirt getting into the filter but with regular maintenance it is fine. Never had any issues with water getting in and driven in some very prolonged wet conditions as well as snow. One day I might get round to "tarting" it up, will never look like your engine bay though. I have just found my notes from when I did the tests and have slightly exaggerated the gain it was actually 4.92%

Function is always the first priority. Frankly I often get embarrassed about my engine bay (bling!), but it IS a fun place to spend a day. My wife thinks I am cleaner AFTER! I have never seen anyone get distraught because their plenum isn't shiny enough, but the same people are dismayed if their engine stops working.

On that subject, if we adopt a non-diagnostic approach to your friend Grump2's issue (I have learned to prefer a step-by-step method as it is ultimately less frustrating) he might have a VERY common problem. The thermisters (one or the other)..little senders that read fuel temperature and coolant on Hotwires, could have gone south. I wrote an article about that decades ago, when a late good friend, Ed Herman, got stalled with it. https://www.gomog.com/allmorgan/StepperMotor.htm#Stalling Sorry, the pics aren't working and I have no access to GoMoG administration at the moment. I am WAY off in the woods.

It is likely one of the two. One is screwed into the fuel rail and the other is screwed in (nearby) into the intake manifold.. Not hard to find or exchange. On a difficulty level, it is a 2 on 10 that will save him a small fortune at any LR or Morgan dealer. Most mechanics weren't born when his car was made and modular manufacture and thinking isn't as insightful. He should swap in the fuel temp one first.

Definitely worth a try. It is about time they both failed anyway.
Fuel Thermister https://rimmerbros.com/Item--i-ETC6661P (they are cheaper from other sources but I like Bill Rimmer)
Coolant Thermister https://www.ebay.co.uk/itm/332398094307?epid=248659015&hash=item4d647867e3:g:HPQAAOSwTLlZ0Wya

Lorne

Graham Bell’s book “Modern Engine Tuning” gives a lot of test comparisons for various filter makes using test engines. He also tests improving air supple, filter box mods, to get test result figures to show effects. From memory he shows bhp/torque variances from dyno tests. In general the increases appear small-ish and best at higher revs. If you are chasing performance then cold air/freeflow filter is a cheap starting point. Dyno tests will show figures before and after. Will you feel any difference when driving? Maybe if you are empathetic with your car!
My Plus 8 (Gems version) definitely goes better with K&N filter and Shell V-Power, bonnet extenders. In my view anyway!!!
Actually the V-Power has removed an occasional fault code flashing up and I estimate about 1mpg better consumption.