Air Intake, Exhaust

[mbdougl]

I found this on another site, it cracked me up.

Simple engineering calculations!
Each 11F air temp drop increases density by 1%, so measure the air flow temperature before and after a change to se how much you gained.

Air flow restiction can be easily measured with a manometer attached just in front of MAF. The absolute aymospheric pressure is 407 inches of water column at sealevel [29.92" HG].

Normal oem intake and air filter have ~~ 6-7" H2O of restriction as measured in front of MAF. So measure before and after. So a 4" improvement at peak rpm [4/27.7 = 0.1444 x 0.68 = ~ 1% improvement].

3 HP maximum improvement +- any temperature change improvement.

Most after market system actually increase temperature [measured at highway speed] so measuring temp is a must.

Reminds me of the old days when we used to flip the air cleaner lid over on the carb, made it sound like you had all kinds of power but actually was pulling in hotter air!

[Scarsman]

Originally Posted by mbdougl

Reminds me of the old days when we used to flip the air cleaner lid over on the carb, made it sound like you had all kinds of power but actually was pulling in hotter air!

Ah yes! The good old days! Sure did sound cool!

[H2Much]

Thanks for the input guys. I think I might try the intake and see about doing headers and exhaust. I keep getting the supercharger advice, but I can't affor to buy one of those and then replace everything after 10,000 miles of it burning everything up on my ride. I am hoping that with my regear and the superchip that the intake and exhaust will compliment the performance of the chip a little bit more.

I am super satisfied now with the regear and the chip from how it was riding before, but I just need a little bit more.... just on the top end....

[kchummer]

The K&N is a waist of money IMO....I was tired of the growl and hiss it put out and when temps were in the 100's, I feel the design of the K&N lets in too much hot air from motor/plus 100 degree weather that it hindered performance more than helped...so I went back to stock setup....The Volant is probably the best since it's a totally sealed design, yet is more freely flowing than stock...just my 2 cents before you spend a lot of cash

[IRA51]

K&N and all Oiled filters let more dirt pass than OE paper filters . They will only have a litle more flow above 35000rpm's on a stock engine. If you send your oil out and have it anilised (spelling) you will se an increase in silicats with a K&N over OEM filters . Been there Done that .

[Xotik H3]

Originally Posted by IRA51

K&N and all Oiled filters let more dirt pass than OE paper filters . They will only have a litle more flow above 35000rpm's on a stock engine. If you send your oil out and have it anilised (spelling) you will se an increase in silicats with a K&N over OEM filters . Been there Done that .

The only thing you got right in your post is K&N uses oil in the filter.

[AbdulMateen]

I just made minor changes. I haded a Superchips cortex and just put on a Magnaflow model 16673. I notice the faster take off and speed. Im only using 87 oct. Im going to add a Cold air system, headers and 22 or 24 on atr tires. Any suggestions on performence parts that i can add is welcome. i have a 04 H2 85% blacked out.

[Scarsman]

Originally Posted by IRA51

K&N and all Oiled filters let more dirt pass than OE paper filters . They will only have a litle more flow above 35000rpm's on a stock engine. If you send your oil out and have it anilised (spelling) you will se an increase in silicats with a K&N over OEM filters . Been there Done that .

I'll back you on this. I have seen a lot of bikes/quads running K&N filters, as well as trucks. Without fail in the ones used in dusty environments I always see dirt residue stuck to the intake walls post filter. If you talk to a serious performance bike/quad engine builder they will recomend against K&N type filters for dune machines, because they will let more dust through. Incidently, foam is not great in sand either, as the sand grains can migrate through the foam.

I have run both K&N and stock filters in many of my own trucks, and I am back to using stock filters due to always finding dust and dirt past the filter with the non stock filters.

If I was building a race car or a street only high performance engine, I would run a K&N, but anything going offroad I'll stick to stock type filters.