Frequently Asked Questions

 

THE POWERFLOW DIFFERENCE

Why are our filters better?
Why is cotton gauze a BAD material?
How do filters work?
What's the difference between the asphalt and dirt filters. Are they different as far as flow and efficiency, different media altogether? I'm interested in a street/off road 14x3 filter. Thanks.

Circle Track

Do you make a filter for the holley 4412 500cfm carb
We run an off-road race truck. We are changing from a K&N to yours. We have run a flow thru top in the past. We will be running your 4412 base with your 5 inch tall filter. Should we run a flow thru top or not?
i run a 4777 holley and 80541 willys ...im looking to purchase new filters if.possible a new base as well 3"deep.so.air.cleaner.sits.lower i need product info to help me.buy this thru you
Which air cleaner base do you recommend for my application. Northeast Big Block Modified. open or 4 hole, 1" or 2". are there any clearance issues w/throttle linkage
We use a 4150 style Holley 4 barrel but it must have the choke tower. Do you have a base for that carb. if more than one, what are the depths?.....thanx.
I run a mini champ truck on asphalt.It is powered by a 2 stoke snowmobile engine.I found some kart racing filters that will fit on my carbs.Will these filters work on a 2 stroke engine?
Should I Run A Pre Filter Around Your Filter, I Have Outerware Pre Filters
The dimensions you provide for the Mini Sprint Car Air Filters, are they inside or outside measurements?

Filter Maintenance

Can I wash my R2C filter?
I have a 2006 Infiniti G35X with 84350 miles and the r2c air filter installed since 62000 miles and needed to know if it should be replaced or continue to just clean it with air and cleaning solution like stated with simple green, what is life of it?
i have r2c short dry ram air for my infiniti g37 2009 sedan. how can i clean my filter because air is not cleaning it very good, i live in hot and little dusty area

THE POWERFLOW DIFFERENCE

Q: Why are our filters better?
A:

Check back daily!

R2C engineers will provide responses to your questions.


 

Most low-restriction air filters start with a sheet of cotton gauze, almost identical to the stuff used to dress wounds. We can all agree that cuts and high-performance engines have very different needs. So why is there a bandage in your engine?

Most "performance" filter companies (names withheld to protect the guilty) use gauze to achieve low air restriction. We use a patent-pending filter media that was designed specifically for engine intake filtration. All of our filter and intake systems are engine-specific so they maximize the performance of your vehicle.

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Q: Why is cotton gauze a BAD material?
A:

Does someone have a bandage?
(Cotton gauze filter discussion)

During the course of our product development, we did a lot investigation on the low restriction products currently available to the auto enthusiast. Cotton gauze dominates this market and while all gauzes start out as the same white color, they then get tinted with various hues of oil.

There are red, blue and some green ones. We even saw one that was kind of orange (red gone wrong, maybe). One thing they have in common, regardless of their color, is they are all made from a material that was never intended to be used for filtration.

We were mildly amused by the descriptions some of these suppliers used to describe and justify the use of something other than a purpose built material for filters. Some counted the number of layers they used. Others described the gradient density of their layers, but the most telling was the one who proudly proclaimed their use of “medical grade gauze.” We still haven’t figured out what that has to do with protecting your engine, but it might come in handy if you’re injured while on the road.

What’s wrong with cotton gauze and what can do a better job?
The answer to that depends on what you expect your air filter to do. Being the old-fashioned type, we expect an air filter to protect our engine from airborne particulate and that means getting the highest possible filtration efficiency. If you can accomplish that at a restriction level equivalent to the gauze products, most people would agree they’d rather have higher effciency than lower.

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Q: How do filters work?
A:

 

 

 

Most low-restriction air filters start with a sheet of cotton gauze, almost identical to the stuff used to dress wounds. We can all agree that cuts and high-performance engines have very different needs. So why is there a bandage in your engine?

Most "performance" filter companies (names withheld to protect the guilty) use gauze to achieve low air restriction. We use a patent-pending filter media that was designed specifically for engine intake filtration. All of our filter and intake systems are engine-specific so they maximize the performance of your vehicle.

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Q: What's the difference between the asphalt and dirt filters. Are they different as far as flow and efficiency, different media altogether? I'm interested in a street/off road 14x3 filter. Thanks.
A:

R2C Drag and Pavement race filters feature a unique filter media that offers incredible airflow while providing excellent engine protection. The media is designed differently than our dirt racing filters due to the fact that pavement filters are not required to hold as much dust during competition.

R2C dirt filters offer more power once loading begins and minimize the in-race restriction that robs power when using paper or oiled gauze.

The Sportsman Series SSR10600 series would be an excellent choice for a performance Street Rod or Muscle Car.

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Circle Track

Q: Do you make a filter for the holley 4412 500cfm carb
A:

Thanks for your inquiry.

Extensive dyno and track testing has revealed the R2C 4412 filter base and R10522 filter produce the most power. Advantages in torque occur at mid RPM levels and are maintained through peak. The bases are available in carbon fiber as well as composite for IMCA 2V racers.

Thanks for your inquiry.

Extensive dyno and track testing has revealed the R2C 4412 filter base and R10522 filter produce the most power. Advantages in torque occur at mid RPM levels and are maintained through peak. The bases are available in carbon fiber as well as composite for IMCA 2V racers.

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Q: We run an off-road race truck. We are changing from a K&N to yours. We have run a flow thru top in the past. We will be running your 4412 base with your 5 inch tall filter. Should we run a flow thru top or not?
A:

Our recommendation would be to avoid the air cleaner tops that incorporate media. This is especially true when the filter top is exposed to high face velocity and airflow across the top of the filter.

Pressure drop issues may actually cause a detrimental effect across the booster/venturi. We have seen many that were wet with fuel on the clean side.

For maximum performance and engine protection, use R10522 or R10523 for this application if room allows.

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Q: i run a 4777 holley and 80541 willys ...im looking to purchase new filters if.possible a new base as well 3"deep.so.air.cleaner.sits.lower i need product info to help me.buy this thru you
A:

Does the 650 double pump Holley still have a choke tower?

Regards,

R2C

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Q: Which air cleaner base do you recommend for my application. Northeast Big Block Modified. open or 4 hole, 1" or 2". are there any clearance issues w/throttle linkage
A:

Use the CFD AC10617 for best results across the power band on your application. In 450" + applications, it made excellent torque and power through 7500 RPM. The 4 hole is better in the higher ranges but gives up performance from 4500-7000.

 

 

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Q: We use a 4150 style Holley 4 barrel but it must have the choke tower. Do you have a base for that carb. if more than one, what are the depths?.....thanx.
A:

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Q: I run a mini champ truck on asphalt.It is powered by a 2 stoke snowmobile engine.I found some kart racing filters that will fit on my carbs.Will these filters work on a 2 stroke engine?
A:

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Q: Should I Run A Pre Filter Around Your Filter, I Have Outerware Pre Filters
A:

Pre-filters are designed to keep large debris from becoming lodged in the air filter screen and media. They do not stop dust. Consider the track conditions that you'll face to determine if the pre-filter will be an asset during each event. They do add a small level of restriction.

 

 

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Q: The dimensions you provide for the Mini Sprint Car Air Filters, are they inside or outside measurements?
A:

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Filter Maintenance

Q: Can I wash my R2C filter?
A:

R2C filters feature a specially designed media that allows performance and efficiency to be restored to near new each time by simply using compressed air from inside out, making washing  unnecessary to restore filter performance.

R2C Pro Series filters feature a media that is fully compatible with washing.  Biodegradable cleaners such as Simple Green or other mild shop degreasers can be used. Simply place the filter in a solution or spray the cleaner on the filter. Allow the solution to loosen the particulate and then rinse thoroughly. Shake the filter or use compressed air from the inside outward to remove residual water and allow a full day or two to dry. While the media may discolor and become light gray, filter efficiency and restriction are not affected.

R2C Sportsman Series filters are cleaned with compressed air only and are not to be washed.

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Q: I have a 2006 Infiniti G35X with 84350 miles and the r2c air filter installed since 62000 miles and needed to know if it should be replaced or continue to just clean it with air and cleaning solution like stated with simple green, what is life of it?
A:

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Q: i have r2c short dry ram air for my infiniti g37 2009 sedan. how can i clean my filter because air is not cleaning it very good, i live in hot and little dusty area
A:

You can wash the filters in a solution of a biodegradable cleaner like Simple Green. Let them soak in the cleaner for an hour or so, rinse and blow the residual water out of the fiber structure from inside-out.

These filters dry very slowly!  I would suggest doing this when the car can be parked for a couple of days.

Thanks
R2C

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Can't find what you are looking for?

Click here to ask your own question.

 
 

“I would like to say thanks for making a filter that does what you claim. We run a DIRT northeast modified and I tell you what, it could not have been any dustier. We finished second 4-25-09 in part with your product. When Sunday morning rolled around, the first thing on the list was to see how well the filter worked. When removing the filters lid, it was hard to say what I was going to find. Where's the dust? Clean as a whistle. Thanks again for making a useful product available.”

 
Ken

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R2C Competition Filters

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For deep, flag-to-flag horsepower, Circle Track winners nationwide rely on R2C Competition Filters!

 
 
 
 
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