On May 9, 2013, at 3:49 PM, Barney Gaylord <barneymg@mgaguru.com> wrote:
> I don't know if the current Moss oil signal hose is Teflon lined. It
doesn't say that in the catalog listing. Time to ask Moss. Got your ears up,
Kelvin?
Certainly the one that failed in my car was not.
> It seems like such a trivial thing to do in production, and shouldn't add
much to the cost of the raw hose (compared to total cost of manufacturing the
hose assembly). However, while fuel hoses run under 10 psi, the oil hoses run
up to 100 psi, and hydraulic clutch hose runs about 250 psi, and brake hoses
more like 500 psi. Brake hoses have thick wall and very small bore size
(which is okay for very low flow rate). Clutch hose has larger bore for
higher flow rate (for quick clutch return). Fuel hoses have much larger bore
and thinner wall. These are all different creatures, so they don't
necessarily all come from the same production factory.
The hose that failed on my car is a single-walled unreinforced rubber tube
that was then covered in braided steel. The outside diameter is 5/16", with a
1/16" thick wall (3/16" inner diameter).
I've posted a picture here:
http://farm8.staticflickr.com/7325/8723754053_7662f98784_c.jpg
(or larger version:
http://farm8.staticflickr.com/7325/8723754053_13e399e196_o.jpg)
I was actually pretty shocked at how small the tube was under that steel mesh.
Fuel line, even the stuff that is designed for carbs instead of FI has
significantly more structure.
--
Aaron
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