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Cox Engine of The Month
Horseshoe backplate spraybar removal
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Horseshoe backplate spraybar removal
I am setting up my Tach race engine and I noticed that the spray bar hole is cocked to the left when viewed from the venturi hole. I was wanting to press it out and center it as well as give it a thorough cleaning. I know this was mentioned elsewhere but I cant seem to find it. So what is the best way to press it out? I only have one shot at this and I don't want to break anything.
Cribbs74- Moderator
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Posts : 11895
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Re: Horseshoe backplate spraybar removal
I was reading Larry Rengers how to hop up those backplates a fews days ago. He said turn vent hole 15 degrees downstream of perpendicular to the flow. He was talking about getting more power out of the Hiper Viper.
crankbndr- Top Poster
- Posts : 3067
Join date : 2011-12-10
Location : Homestead FL
Re: Horseshoe backplate spraybar removal
I have the same problem, but am not going to mess with it in fear of breaking something.
Re: Horseshoe backplate spraybar removal
Or just use a different spraybar like I did.
Pic coming shortly.
Pic coming shortly.
Re: Horseshoe backplate spraybar removal
Photo the backside?
crankbndr- Top Poster
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Join date : 2011-12-10
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Re: Horseshoe backplate spraybar removal
Good idea Nitro, unfortunately I don't have the time to get that done before the Tach Race!
Cribbs74- Moderator
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Posts : 11895
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Re: Horseshoe backplate spraybar removal
crankbndr wrote:I was reading Larry Rengers how to hop up those backplates a fews days ago. He said turn vent hole 15 degrees downstream of perpendicular to the flow. He was talking about getting more power out of the Hiper Viper.
Thanks for the suggestion, I am not sure if that is what I already have going on. I am having a little trouble visualizing what you mentioned. The spray bar is perpendicular already but the hole the fuel sprays from is off center. 15 degrees? Not sure.
Cribbs74- Moderator
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Posts : 11895
Join date : 2011-10-24
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Re: Horseshoe backplate spraybar removal
Yeah, I want to do that too, nobody has answered my original question as to how to properly press the spray bar out!
Cribbs74- Moderator
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Posts : 11895
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Re: Horseshoe backplate spraybar removal
cribbs74 wrote:
Yeah, I want to do that too, nobody has answered my original question as to how to properly press the spray bar out!
I don't know I just drilled it out along with the excess delrin.
Re: Horseshoe backplate spraybar removal
nitroairplane wrote:cribbs74 wrote:
Yeah, I want to do that too, nobody has answered my original question as to how to properly press the spray bar out!
I don't know I just drilled it out along with the excess delrin.
I found the other thread started by Micro, good explanation of how it is done.
Cribbs74- Moderator
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Posts : 11895
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Re: Horseshoe backplate spraybar removal
Another way to say it would be to turn the vent hole 75 degrees from strait forward, almost sideways.
crankbndr- Top Poster
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Re: Horseshoe backplate spraybar removal
85 degrees from forward would be 15 from perpendicular. To remove it, I would try(never done this) heating it with a soldering iron and pulling it out, then re-seat it with some JB Weld on the splines.crankbndr wrote: Another way to say it would be to turn the vent hole 75 degrees from strait forward, almost sideways.
I can't see the hole in the spraybar in that picture. As for the venturi, I think whatever size the red KB venturi is is about the useable maximum, After that it probably gets really hard to crank.
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RknRusty- Rest In Peace
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Re: Horseshoe backplate spraybar removal
crankbndr wrote: Another way to say it would be to turn the vent hole 75 degrees from strait forward, almost sideways.
So were they offset from the factory on purpose?
Re: Horseshoe backplate spraybar removal
Done!
That was so easy that I feel stupid for even asking the question.
That was so easy that I feel stupid for even asking the question.
Cribbs74- Moderator
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Re: Horseshoe backplate spraybar removal
cribbs74 wrote:Done!
That was so easy that I feel stupid for even asking the question.
So how did you do it?
Re: Horseshoe backplate spraybar removal
Popped the black tube piece off, pushed on the brass tube with a plastic drift and out she came!
Cribbs74- Moderator
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Re: Horseshoe backplate spraybar removal
crankbndr wrote:I was reading Larry Rengers how to hop up those backplates a fews days ago. He said turn vent hole 15 degrees downstream of perpendicular to the flow. He was talking about getting more power out of the Hiper Viper.
Do you have a link for the article? I would be interested in reading it if possible.
Thanks,
andrew
Re: Horseshoe backplate spraybar removal
Don't think this is the exact article but it's written by Larry Renger
http://www.mccookfieldfac.com/helpful-info/cox-engines.pdf
It's a good read nonetheless.
http://www.mccookfieldfac.com/helpful-info/cox-engines.pdf
It's a good read nonetheless.
Cribbs74- Moderator
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Posts : 11895
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Re: Horseshoe backplate spraybar removal
According to Larry, I've already ruined all of my engines by washing them off with fuel and flying them again. Oh well, I wouldn't have much fun if I went home as soon as I crashed every time.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: Horseshoe backplate spraybar removal
I cant link to the article, found it searching the archive posts of .049 Collectors Group. Search "Larry Renger backplate".
Im on a Mac and tried for hours how to link in a post, could not figure it out. Anyone on a Mac that knows how? A PM with a how to would be greatly appreciated.
Im on a Mac and tried for hours how to link in a post, could not figure it out. Anyone on a Mac that knows how? A PM with a how to would be greatly appreciated.
crankbndr- Top Poster
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Join date : 2011-12-10
Location : Homestead FL
Re: Horseshoe backplate spraybar removal
crankbndr wrote:I cant link to the article, found it searching the archive posts of .049 Collectors Group. Search "Larry Renger backplate".
Im on a Mac and tried for hours how to link in a post, could not figure it out. Anyone on a Mac that knows how? A PM with a how to would be greatly appreciated.
Hi Douglas,
I am on a mac to link.
Select the text/URL that you want to link.
Once selected hold down the button called "cmd" and "c" at the same time and then to paste it hold down "cmd" and "v".
Indra
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