K&N air filter

Post by **Declan_Burns** » Sun Jan 11, 2009 6:00 pm

Which K&N air filter should be used if I fit the HIF 38 carb with the Metro inlet?
Declan

(DEC 1964H / Formerly HMP 960B)

Post by **GAS** » Sun Jan 11, 2009 6:17 pm

unless you know what jet you need,i would not bother.Using the filter alone leans the mixture and the engine runs rough...

Post by **bmcecosse** » Sun Jan 11, 2009 6:51 pm

I got a K&N 'lookalike' from ebay - and it works very well. It must be the conical type - NOT a flat pancake - they are hopeless.

Post by **Declan_Burns** » Sun Jan 11, 2009 7:14 pm

Thanks BMC,
Just had a look. I think I know what you mean.
Declan

Post by **PSL184** » Sun Jan 11, 2009 7:15 pm

I'm using one of those off ebay - no probs and it looks good too

Post by **8009STEVE** » Sun Jan 11, 2009 7:48 pm

Argos do a lookalike for 19.95

Post by **Peetee** » Sun Jan 11, 2009 8:33 pm

If you intend to do these mods and then just run the car after a basic set up I wouldn't bother with a K&N. There are small improvements to be had with one but unless the car is properly set up on a rolling road you are unlikely to notice them. What you will notice however with a K&N is the huge increase in noise!

Post by **bmcecosse** » Sun Jan 11, 2009 9:39 pm

My engine is warmed over -it would NOT run at all well on the standard air filter casing -even with no element inside! And yes - the flange was opened up to suit the larger carb. Runs fine with the 'lookalike' - yes it's noisy, but not as bad as it was when running open mouth carb.

Post by **Kevin** » Mon Jan 12, 2009 4:57 pm

Just wondering if the cone filter type of element would fit in the standard housing ?

Post by **Peetee** » Mon Jan 12, 2009 6:15 pm

I have a K&N cone filter designed to fit to a HIF 38. With the metal plates removed it does fit in the standard 1098 filter casing but it requires a considerable packing spacer to fill out the height. High density foam would do the trick but it would need a hole down the middle. Also note BMC's comment. The standard casing provides poor breathing but can be modified by cutting out a 38mm hole where the trumpet enters.

Post by **bmcecosse** » Tue Jan 13, 2009 12:03 pm

I tried cutting many holes in the casing - and filling it with oiled copper pot scourers - the engine STILL wouldn't run at all well. Strange I know - but I tried lot's of different ways. And I made sure the little air holes at the side of the main carb intake were not blocked off. The cone filter works fine !

Post by **chrisd87** » Tue Jan 13, 2009 9:39 pm

It must be the conical type - NOT a flat pancake - they are hopeless.

I'm assuming you mean the traditional style thin pancake filters. I've got a thick K&N pancake filter on my tuned 1098 and it works fine. Agreed about the noise though - it does make a racket, especially if you floor the throttle at highish speed.

Post by **bmcecosse** » Tue Jan 13, 2009 9:51 pm

The flat face of the filter - opposite the carb inlet - should be AT LEAST 1.5 X the diameter of the inlet hole away from the carb face.