Topic: function of Jug fin pucks

[johnyvilla]

I am about to have my jugs media blasted and I was wondering if I should remove those rubber pucks, (for lack of a better term) from between the fins.

Why are they there anyway?

[mystic_1]

They're supposed to keep the fins from vibrating at the resonance frequency of the engine.

Later engines omitted them completely.  I'd remove them for media blasting, but they'll tear on the way out and replacements are expensive so plan on running without them unless you're a restoration purist.

mystic_1

[markb]

Yea they're expensive ($3 apiece) and the only replacement ones I've been able to find are black, not the original color.  Sometimes if they're not too hard you can get them out without tearing.  I've got a bunch I've scrounged and one of these days I'll pick the best ones and reinstall them unless someone knows a source for the original color.  Otherwise I wouldn't replace them either.
Mark

[johnyvilla]

Well if they omitted them, I don't need them.
Thanks

[lordmoonpie]

I left mine in for blasting and didn't lose a single one of them. Be sure you want to take them out- that resonance creates extra noise. Extra noise needs energy to create it so you end up with a noisy powerloss! (well in theory)