Severe fuel leak from somewhere behind and below #1&3 carbs?
mdalbert:
I’m going with Mooskee on this.
98valk:
Quote from: rug_burn on October 13, 2024, 07:07:52 PM
I know- he never gets tired of for repeating that stuff about the rack clamp bolts. And it's not even right. But who wants to argue?
When configured as in the fuel rails, o-rings seal on cylindrical surfaces, inner and outer, the o-ring OD and ID compressed between them in a 20% squeeze. The cross sectional diameter of the o-ring needs to be compressed to 80% of it's original size, a 20% squeeze. Like for example a -121 o-ring has a .103" cross section, so 80% of this is .082, the distance between inner and outer diametrers.
You can also arrange an o-ring as a face seal, with a circular groove in one flat surface sealing to a flat surface on another, like on the intake tube to head connection. The 20% squeeze rule still applies, but it seals on the face of the o-ring, not the ID and OD. The distance between the depth of the o-ring groove and the face of the other mounting surface must be 80% of the o-ring cross section.
When used as it is in the fuel rail connection tubes and T fittings, the seal is solely on those inner and outer cylindrical surface and smooth bores. Unless they're loose, compressing the carbs by tightening those rod nuts actually has almost zero effect on those o-ring seals. Seriously. I mean, there needs to be end play in that joint, where T fittings still pivot, right? How does tightening those bolts do anything?
https://madisongroup.com/o-rings-an-effective-simple-and-versatile-sealing-solution/
""In order to seal reliably, a continuous “seal line” must be formed at the interface between the O-ring and the mating gland surface. The creation of this “seal line” is a result of a combination of the gland design, the O-ring cross-section, and the proper level of compression of the elastomeric material.""
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