Foam Sock filters cost me 55bhp

[reggid]

so i installed an ITB system with runners and put a cheap set of oiled foam sock filters on as a temporary means to get the engine running before an airbox is made.

doing nothing more than putting socks on caused 25-30% power loss compared to open runners. the power peaked very early and plateau classical sign of a restriction.

the difference was staggering

my question is does over oiling worsen the problem, i used the oil the dirt bike guys use and followed their recommended application procedure?
do cheap filters use poorer flowing elements would something from ITG be likely any better?
or are socks filters just rubbish all together and to be avoided like the plague?

i used these

http://ramair-filters.co.uk/cs-carb-socks/twin-car...

[reggid]

thanks is there a better brand? what oil do you recommend? i have cleaned a lot of oil out and it is better but still not the same by a noticeable amount.

[reggid]

im doing runner length testing so wanted a way to be able to add a simple filter. once i know the length and taper etc i will make a plenum to suit. its not possible for me have a plenum and adjustable length runners space is at a premium.

i have cleaned them about 4 times to try get rid of the oil and most is gone and it is definitely better but will try kerosene to get the last bit out.

[reggid]

well only kerosene was able to get the oil out completely, the air filter cleaner and K&N stuff only did half the job

seat of the pants says its much much better when dry and as good as it is going to get. next time im at the rolling road testing i will retest with and without the filter i expect maybe 5-10% loss

[reggid]

well ran the dry foam socks up and result was 8rwkw loss with filters vs without which is better than 33rwkw with the oiled ones.....

[reggid]

Mr2Mike said:

reggid said:

well ran the dry foam socks up and result was 8rwkw loss with filters vs without which is better than 33rwkw with the oiled ones.....

You might as well just remove them, without the oil they won't remove any of the fine dust that causes engine wear. Does go to show what an utter waste of time sock filter are though, hopefully this may make other people think twice about using them.

its a temporary thing the engine is coming out later this year for a rebuild and as such a few fine particles dont bother me. im worried about large objects getting in causing a catastrophic failure....

[reggid]

an oiled K&N dcoe filter would work well i think but i dont have the space in the bay with the current configuration as they are taller that the socks.

a nice airbox with single filter near headlight is the way to go and will get there at some point