which sealant better (or best) for airbox filter?

[alpinelakespilot2000]

For 0-320 FAB installation, the filter needs to be notched to fit over the carb's accelrator pump. Van's FWF instructions indicate that RTV silicone can be used to fill in the resulting gap between the filter and pump.

Of the two below, which would be more appropriate for this application. One, is specifically listed as a high temperature (500 degree) RTV silicone. The other is a higher temp gasket sealant (rated for 600 degrees):
Permatex? Hi-Temp RTV Silicone Gasket Sealant
http://www.permatex.com/products/Aut...et_Sealant.htm
Permatex? 1372 High Temperature Form-A-Gasket? Sealant
http://www.permatex.com/products/Aut...et_Sealant.htm

I'm particularly concerned about any possibility of a small portion of sealant breaking off and being sucked into the carb. I assume that would not be good. However, that Van's calls for it to be done this way, I take it that it's not a significant issue.

Any idea which of these (or something else entirely) might be better?

[mannanj]

Originally Posted by alpinelakespilot2000

For 0-320 FAB installation, the filter needs to be notched to fit over the carb's accelrator pump. Van's FWF instructions indicate that RTV silicone can be used to fill in the resulting gap between the filter and pump.

Of the two below, which would be more appropriate for this application. One, is specifically listed as a high temperature (500 degree) RTV silicone. The other is a higher temp gasket sealant (rated for 600 degrees):
Permatex? Hi-Temp RTV Silicone Gasket Sealant
http://www.permatex.com/products/Aut...et_Sealant.htm
Permatex? 1372 High Temperature Form-A-Gasket? Sealant
http://www.permatex.com/products/Aut...et_Sealant.htm

I'm particularly concerned about any possibility of a small portion of sealant breaking off and being sucked into the carb. I assume that would not be good. However, that Van's calls for it to be done this way, I take it that it's not a significant issue.

Any idea which of these (or something else entirely) might be better?

I too am extreemly concerned with silicone flaking off and being sucked into places it doesn't belong. I have seen silicone strings and globs caught in oil filters in auto engines where it was used as gasket material.

If properly done and installed on clean, dry aluminum intakes, the risk should be minimal. Just make sure that you prepare the surface according to mfgr's instructions.

There can be absolutely NO and I repeat NO oil on the surface that the silicone is applied to. Otherwise it will peel, slide, flake or slip off what it was applied to.

I like Pro-Seal better.

[IowaRV9Dreamer]

Does the sealant have to be re-done at every filter change?

[LarryT]

Please search the archives for my posts about this. Using the K&N website I found a filter that has a larger ID than the one Van's supplies. Its CFM rating is just a few percent less. I am at work and can't remember the part no. The one I use can be snaked around the accelerator pump well without modification. The ID of the Van's supplied unit is dimensionally SHORT of conforming to the oval perimeter. The one I use slightly overhangs the metal plate but fits inside the FAB just fine.

LarryT

Originally Posted by alpinelakespilot2000

For 0-320 FAB installation, the filter needs to be notched to fit over the carb's accelrator pump. Van's FWF instructions indicate that RTV silicone can be used to fill in the resulting gap between the filter and pump.

Of the two below, which would be more appropriate for this application. One, is specifically listed as a high temperature (500 degree) RTV silicone. The other is a higher temp gasket sealant (rated for 600 degrees):
Permatex? Hi-Temp RTV Silicone Gasket Sealant
http://www.permatex.com/products/Aut...et_Sealant.htm
Permatex? 1372 High Temperature Form-A-Gasket? Sealant
http://www.permatex.com/products/Aut...et_Sealant.htm

I'm particularly concerned about any possibility of a small portion of sealant breaking off and being sucked into the carb. I assume that would not be good. However, that Van's calls for it to be done this way, I take it that it's not a significant issue.

Any idea which of these (or something else entirely) might be better?

[alpinelakespilot2000]

Originally Posted by IowaRV9Dreamer

Does the sealant have to be re-done at every filter change?

No, this filter is designed to be cleaned, not discarded, with cleaning kits available at auto parts stores.

[alpinelakespilot2000]

I would guess it depends on size, but what would be the range of consequences for a piece of RTV or proseal (being used to seal the gap around the accelerator pump) being sucked into the carburetor?