Under Tank Air Filters
 

Having read and re-read posts in the past on this subject, decided today was the day to run back to back tests with and without filter to see if there was any difference.
First run gave 121 rwhp and 73 ft/lbs of torque. Removing the filter gave an increase of 5 hp at 4000 rpm, 10 hp at 6000 rpm, 20 hp at 7500 rpm and 8 hp at 8500 rpm. Max power now 130 rwhp, max torque 80 ft/lbs. Unfortunately my Power Commander has snuffed it :(:( so I can't change the fuelling, but it is running weak in the mid range so there may be another 5hp hiding there, and rich at the top end so am looking for another coulpe of horses on top. Anyone want a slightly used Ramair filter:D:D:D

Wot bike, Wot under tank filters, JHP ones?

I think from past posts, its a 996SPS:)

Yes its a 99 996 SPS, standard except for corrected valve timing. Filter was a ramair foam type, which fitted over both bellmouths and took up about half the airbox volume. Think other types of over bellmouth filters are the same. Shazaam did some posts some time back about these types of filters, which is what set me thinking.

[Edited on 14-1-2005 by ducv2]

Have you tried Pipercross OEM-style replacement filters? These are the different-density foam style filters but fit in the airtubes.

Pipercross part number MPX-038 and about £18 a pair from http://www.Demon-Tweeks.co.uk/

Should give increased flow rates through better foam design, but keep the large volume of clean air available in the airbox.

Would be interesting how these rate against under-tank filters.

This is the first under tank system filter I fitted.

After having a minor problem with the first filter I fitted these filters which were a direct replacement from JHP, also. Very satisfied with them now.

I've got the Pipercross replacements fitted in place of the undertank filter that was in there when I bought the bike. There's a noticeable improvement.

Pipercross quote only a 1BHP drop in power when compared to no filters.

I'm running the Pipercross filters too, but just wanted to be objective and get it measured on the same bike/dyno to give a decent comparison.

An interesting thread this, has anyone done dyno tests with standard cleaners then JHP under tank items to see what the increase might be or even dynoed a bike with under tank filters as well as a set of Termi`s in place!

I have a dilemma related to this - I recently got a 916SPS that came with "bling" C/F airtubes that have no provision for standard filters. Bike is therefore fitted with a JHP undertank filter. On my previous 748, I tried out a JHP filter and wasn't impressed so went down the Pipercross route instead.
I would ideally like to get rid of the JHP filter on the SPS but don't want to get rid of the bling airtubes! Any recommendations?
R X

Powercommander on an SPS? hmm.. tell me more..

/B

The horsepower increase that you got by removing the RamAir airbox filter is partially due to the increased airbox volume that's no longer being displaced by the filter.

To illustrate this effect, here's a graph that shows the effect of increased air box volume on a 996 using a EVR airbox. Note particularly the smoothing-out of the dip in the torque curve.



So if you're unable to use Pipercross filters in the air runners like RickyX, using BMC filters will probably result in the smallest volume reduction and least degradation to throttle response.



You can read the full explanation here:

http://ducatisportingclub.com/xmb/vi...=1701#pid12578

Thanks for that Shazaaamm! Excellent info as usual.

Anybody know where to get/how much for BMC filters?

R X

Ricky i got a set of these when i first got the R. Like you I wanted to fit carbon tubes. They are not cheap, If memory serves me right about £130 - 150.00. I went for then against the pipercross ones, because I didn't need to alter the fuel lines. I still had to remove the airbox to fit the filter carriers.
I had seen them in one of the bike mags. Try a search under BMC filters. And then look for a stockist. Mine was done through mail order.

BTW. thay are not meant for road use:sniff:

Rick try here

http://www.inter-bike.co.uk/inter-bi...ist&searchstr=

Looks like £135.00

Airfilters
 

During rebuilding my 748R and using carbon tubes, i looked into the airfilter options, I saw the JHP pipercross ones but you had to arse about with the fuel line, and they were expensive. So after looking about on the net i saw a guy had a NO TOIL filter fitted, to his 748R, so i ordered one for mine, was about £60 works well and you dont have to modify the fuel lines!

Are they like the filters above Chris?

Filters
 

No they are not like above, heres the link were i first saw a no toil filter,

http://public.fotki.com/garymilcheck...n_airbox4.html

They fit between the 2 halves of the airbox, i ordered mine, from.

http://www.carbonworld.de

They do them for most Ducatis!

I have a brand new set of these filters, if anyone is interested. £20.

I was going to install them in my RS when it was still on the road, but now that I am racing it only, I don't run any filters.

The filters shown by Shazaam are probably the way I will go, after seeing such a dramatic increase in power after freeing up air box space, I am loathe to put anything in there. The main reason I had for using the over bellmouth filters in the first place was due to finding grit etc in the airbox with the standard runner filters fitted. I since found that the tank was not making a good seal onto the top of the airbox, thus bypassing the filters. Adjustment of the front locating spigot for the tank with a big :o adjustable spanner cured this, but the tank still moves slightly which could break the seal. The tank becoming dislodged in a crash could also result in an engine full of gravel etc, but it would take a bit of force to do this and the bike would probably be totalled anyway. I would post the dyno graphs, but the message board will not let me, any way if anyone is interested drop me a U2U and I will send it by e-mail.

Felix

u2u

Jas
(Hooley)

And back to you, Hooley