Series Air filter upgrade

[cedryck]

Does anyone know if K&N make a series truck air filter replacement for the Oil Bath? Are there any other makes that do the same? Any modifications needed to your carb. after doing so?

[Cevan]

K&N air filters are not good at filtering air. Oil bath air filters are far superior IMHO.

[cedryck]

Could not agree more with you. That is why I have been running an oil bath for the 7500 miles that my series 2a has been on the road. But, I am looking to get a little more breathing from the engine, and considered dumping the filter, I have a stock exhaust and do not know how much more umph it will add. Perhaps I will just stay with what I have.

[SafeAirOne]

"Umph" and a 2.25 are incompatible. That's just the way it is.

[cedryck]

Good one Safe Air one. I am well aware of the slowness, time stops factor of series driving. I think I will keep it as is, plus I love the vintage look when you show someone your engine.

[bugeye88]

I have used K+N filters on many vehicles and find they filter well and improve air flow. You must clean them more frequently if they are used off road in very dirty conditions, but this is easy. If severe conditions are anticipated, put the oil bath back on temporarily, easy. Every car or truck I have put a K+N on has had a noticeable improvement in performance, even the 2.25. This is especially true if you are using a carb that increases intake volume.

Cheers,
Rob

[Apis Mellifera]

I have a K&N on my SIII. There was a noticeable improvement in top speed and acceleration when I ditched the oil bath. Mine wasn't for any particular application. I just looked through the K&N catalog until I found one with the right inlet diameter and height.

[Rat Patrol]

I went OEM and ordered a snorkel and oil bath to replace my filter element. The regular oil bath really restricts airflow where as the snorkel lets more air in with the high quality filtration we expect.

[timc930]

I have a K&N on my SIII. There was a noticeable improvement in top speed and acceleration when I ditched the oil bath. Mine wasn't for any particular application. I just looked through the K&N catalog until I found one with the right inlet diameter and height.

What model did you purchase?

[luckyjoe]

I went OEM and ordered a snorkel and oil bath to replace my filter element. The regular oil bath really restricts airflow where as the snorkel lets more air in with the high quality filtration we expect.

Fuzzy math?

The snorkel tubing and elbows add even more restriction.

[TeriAnn]

K&N filters are used by off road racers who rebuild their engines between races but are otherwise not the best filter to use for off road driving where the dust levels are high. The stock Series filters are a lot better for clearing dust out of the intake air.

If you want the best of both and are willing to do the work you can do a K&N on pavement and switch back to the stock filter when you leave the pavement.

The K&N fits best on the end of the stock system's steel elbow.



If you want the best solution look to see what commercial earth moving equipment and tractors are using then find something with the same air requirements as your engine that can be made to fit.

My V8 powered truck uses a Donaldson paper air filter with a prefilter in front of it. All chosen to meet the airflow requirements of my engine.



You can use the formula below to find out how much air your need and choose a filter or filter & prefilter that operates in that range.

[bugeye88]

TeriAnn,

Your pic of the K+N on the steel elbow is exactly how I have used on two series trucks. My current one is on my 69 Bug Eye with a 34ICH. I agree that on extremely dirty talcum like dust, the oil bath is good, but for most conditions and certainly on road, the K+N is excellent.

Rob

[cedryck]

thanks for the replies. I had a K&N on my Defender, so I was used to taking it out occasionally and washing and oiling it. I agree the oil bath works best with real dirty condition, I am looking to improve on road, and pulling a trailer performance.

[LR Max]

I used to run what TerriAnn posted, that EXACT same setup.

The air filter wasn't big enough once I went with a Rochester. I ended up with a whatever cone filter from Pep Boys. Still cover it in the K&N oil.

No problems and everything looks clean on the inside of the elbow and carb. That said, we don't have fine talc dust here in the southeast. Just normal people dust. After a couple off roading trips, the filter does need to be pulled and cleaned but that isn't a big deal.

[Revtor]

Is the oil bath really that restrictive? Its a big hose going to a big canister, with some steel wool in it, then around a bend (close to some oil) and through 360degrees of louvers.

You guys sure this isn't the fabled K&N placebo effect -guaranteed you think you just made 10HP or your money back?