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Picked up some backplates

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Picked up some backplates

Post  batjac on Wed Aug 16, 2017 11:27 pm

I picked these up on eBay a couple of days ago.  I don't need any more backplates, but I wanted the fine thread needles and spraybars.  I figure $4.50 a piece shipped for the fine thread spraybars is a fair price, considering the equivalent spraybar and needle is going for $10.00 on the Texas Timers website.  I want to use one on my Pipe Bomb Special engine.  Maybe I can get a better needle and smoother run from the Testors engine if I press in a better assembly.  I also want to try pressing one into Matt's new TeeDee venturi to see if I can get a little more adjustment range on bladder pressure.  The other two will end up in my parts bin of bladder stuff for future projects.

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Re: Picked up some backplates

Post  roddie on Thu Aug 17, 2017 2:58 am

Hi Mark, Have you unscrewed any of the needles yet? I'm curious of their tapers between the four of them. I mixed mine up.. and their "stepped" tapers are different. Make sure that you keep the needles paired-up with the spray-bars that they came out of.

Here's a photo example of what I'm talking about..

This second photo shows yet another "short-style" needle (top one) having a "straight" taper.. but unfortunately I misplaced it..  Doh!  

I only have ever had the two backplates.. so I'm not sure where the third needle came from. Installing the wrong needle will be a problem..

I thought that maybe the differing-length fuel-line barbs might be an indication of which needle is the correct one.. except that your three "red" backplates look to have the same needle.. and the upper-left backplate has a long barb.. Huh...

Thanks in advance for any info you can provide.
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