Feuling M-8 Cylinder Head Breathers
Machined from billet 6061 aluminum with square surfaces, these new cylinder head breathers for M-8s from Feuling Parts (Oceanside, California) are designed to promote "excellent umbrella valve sealing" and feature longer main breather exit nipples with dual O-rings "to promote better breather system sealing."
Properly sized breather inlets and location can optimize engine breathing, and these unique Feuling Parts designs maximize breather volume and allow for easy serviceability.
The breather bodies have multiple drain ports located on the inside floor and with ports chamfered on the internal diameter yet squared off on the exits to deter filling from splash oil, the design allows easy and, importantly, effective drainage.
Anodized Feuling red, the kits include the billet breather housings, billet covers, breather filter elements, umbrella valves and quality hardware.
"These breathers work," says Feuling Parts CEO Luke Leatherman. "They seal well so that they hold an engine vacuum. Testing shown on a healthy engine will see 3-4 oz of oil in the sump and once the dipstick is removed another 3-4 oz will drain. For this test, no external venting can be used, meaning a sealed dipstick and trans cover must be used.
"The factory plastic OEM breathers can be problematic, we find that the material easily distorts, especially after seeing excessive heat - then the internal umbrella valve struggles to seal, causing oil carry-over. Another issue found with the OEM breathers is cracked and/or broken exit nipples, which can be caused by heat distortion and/or improper fit and poor installation."
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| Feuling Parts CEO Luke Leatherman: "The factory plastic OEM breathers can be problematic, we find that the material easily distorts, especially after seeing excessive heat - then the internal umbrella valve struggles to seal, causing oil carry-over. These breathers are a stock replacement for M-8 engines on Touring and Softail models. |
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