Air Filter Maintenance

Changing the Spec Racer Ford air filter is very simple requiring no tools, just a simple rag and possibly some degreaser. Most people change it just before qualifying or if it is soaked in oil due to engine blow by.

SRF Equipment Needed:

  • New Air Filter - Enterprise PN: 592231 / 592231F / Fram CA 3660
  • Rag
  • Simple green or your favorite degreaser 

SRF Gen2 Air Filter Replacement

Remove the old air filter by unclipping the two upper and two lower latches on the air box. The air filter should just pull out easily.

Inspect the inside of the air box for oil or debris and clean out with a rag and degreaser if needed. If you have oil in the air box it might indicate excessive oil blow by and potentially a tired engine.

Insert the new filter into the air box.

Latch the two upper clips.

Latch the two lower clips and you are good to go for the next session. Hopefully the engine breathes a little easier and maybe gives you more tenths of horsepower but I doubt you will notice it on the butt dyno.


SRF Gen3 Equipment Needed:

  • Airaid 790-551 Filter Clean and Renew Kit - Oil Aerosol
  • Airaid 790-550 Filter Clean and Renew Kit - Oil Bottle
  • Gen3 Air Filter - Enterprise PN: WM301020
  • Large Screwdriver
  • Degreaser

Maintaining the Gen3 Air Filter

The Gen3 uses a cleanable and reusable air filter. It gets filthy after about 10 on track sessions depending on how many offs in the dirt you or the competitor in front has. The air filter can be removed from the car using a large profile screwdriver on the air box clips. Wipe out the air box removing any dirt and oil build up.

 Photo Courtesy: SCCA Enterprises

Photo Courtesy: SCCA Enterprises

  Photo Courtesy: SCCA Enterprises

Photo Courtesy: SCCA Enterprises

The filter can be cleaned with the Airaid renew kit fluid or your favorite degreaser like simple green. Let the filter dry out, do not blow dry with compressed air as you can damage the filter membrane. Since the oil filter can take time to dry some racers have two filters one in the car and one in the cleaning process.

Next you will need to re-oil the filter follow the instructions in the renew kit. Be careful not to over oil the air filter. Excess oil can build up on sensors and cause running issues. Put the filter back in the air box and secure the fasteners with the large profile screwdriver.

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James Chartres

San Jose, CA