Filler cap modification
Discussion
By popular request (!)
The following are the steps I tool to modify my Vixen filler cap to accept an aero style cap:
(i) Measure up the filler neck you have to ensure compatibility with the aero style cap.
(ii) Source appropriate aero cap, mine is an Aero 200 from www.newton-equipment.com which is available as just a neck and cap. This more usually welded to a filler neck on a custom tank but is also just about the perfect size for pressing into the filler neck.
(iii) Before purchasing, use measurements on the data sheet in the Newton Equipment website (www.newton-equipment.com/Aero%20200%20-%20Tech%20Spec.pdf) to make sure there is sufficient room under your filler cap to accomodate the height of the cap
(iv) Once you have the cap and neck, mount up in a lathe to machine the body of the newly purchased filler cap such that it is a light interference fit to your existing filler neck
(v) Gently press fit the new cap body into your existing filler neck, you might want to use some engineering adhesive/sealant of some type to ensure no fuel vapour can escape
The cap itself is held shut by a couple of rare earth magnets pressed into a machined aluminium carrier which in turn is held into the cap by 3 countersunk screws.
And here's one I prepared earlier....
Thanks again to Tony Freeman for the original idea as published in TVR Sprint magazine some years ago
The following are the steps I tool to modify my Vixen filler cap to accept an aero style cap:
(i) Measure up the filler neck you have to ensure compatibility with the aero style cap.
(ii) Source appropriate aero cap, mine is an Aero 200 from www.newton-equipment.com which is available as just a neck and cap. This more usually welded to a filler neck on a custom tank but is also just about the perfect size for pressing into the filler neck.
(iii) Before purchasing, use measurements on the data sheet in the Newton Equipment website (www.newton-equipment.com/Aero%20200%20-%20Tech%20Spec.pdf) to make sure there is sufficient room under your filler cap to accomodate the height of the cap
(iv) Once you have the cap and neck, mount up in a lathe to machine the body of the newly purchased filler cap such that it is a light interference fit to your existing filler neck
(v) Gently press fit the new cap body into your existing filler neck, you might want to use some engineering adhesive/sealant of some type to ensure no fuel vapour can escape
The cap itself is held shut by a couple of rare earth magnets pressed into a machined aluminium carrier which in turn is held into the cap by 3 countersunk screws.
And here's one I prepared earlier....
Thanks again to Tony Freeman for the original idea as published in TVR Sprint magazine some years ago
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