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Post  Iceberg Sat Aug 07, 2021 7:35 am

I have a backplate that needs to have the spray bar inserted. Then of course will need to drill out the spray bar through the fuel nipple when dry. I was told to use a little sealant at the top of the spray bar prior to pressing into the place and setting it. What type of adhesive is a good one that won't slightly dissolve with the nitro fuel? Silicone or other?

Thanks
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Post  Ken Cook Sat Aug 07, 2021 8:39 am

I assume this is a Cox engine and your making reference to a metal backplate? If so, the spraybar is knurled therefore it really doesn't require any additional sealer. The assemblies can come loose and yes, they can develop air leaks around not only the inside threads of the needle but the outside diameter of the spraybar. I would steer clear of any silicone unless it cures without creating acetic acid. Contractor grade silicone are no good for this purpose. On the other hand, I would use epoxy or JB weld. Both are removable with a heat gun and you don't want hardly any at all inside. First order is to clean outside of spraybar with solvent and thoroughly oil inside threads to avoid any adhesive getting inside. There would be no need to drill back through the nipple if this is what you meant. Insert the spraybar leaving about 1/8" out , apply JB weld of epoxy around perimeter and push it in. Clean residual epoxy using Q-tip and rubbing alcohol.
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Post  Iceberg Sat Aug 07, 2021 9:21 am

Hi Ken
Nice to hear from you again.

Good to know. Stay away from silicone. JB weld good.

The spray bar I'm inserting is a new one for an aluminum back. It did not have a spray bar inserted but was empty. The spray bar doesn't have a hole and I understand to drill it after inserted.

I'll use the JB weld.

Thanks!

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