Horseshoe backplate spraybar removal

**Cribbs74** Wed Dec 14, 2011 9:07 am

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.

crankbndr Wed Dec 14, 2011 12:53 pm

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.

microflitedude Wed Dec 14, 2011 12:54 pm

I have the same problem, but am not going to mess with it in fear of breaking something.

nitroairplane Wed Dec 14, 2011 12:58 pm

Or just use a different spraybar like I did.
Pic coming shortly.

nitroairplane Wed Dec 14, 2011 12:59 pm

crankbndr Wed Dec 14, 2011 1:07 pm

Photo the backside?

nitroairplane Wed Dec 14, 2011 1:10 pm

Ok will do.

**Cribbs74** Wed Dec 14, 2011 1:23 pm

Good idea Nitro, unfortunately I don't have the time to get that done before the Tach Race!

nitroairplane Wed Dec 14, 2011 1:27 pm

cribbs74 wrote:Good idea Nitro, unfortunately I don't have the time to get that done before the Tach Race!

That is true Ron.
Here is a pic of the rear of mine.
I also enlarged the intake for more air flow.
Horseshoe backplate spraybar removal 013

**Cribbs74** Wed Dec 14, 2011 1:28 pm

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** Wed Dec 14, 2011 1:31 pm

nitroairplane wrote:
cribbs74 wrote:Good idea Nitro, unfortunately I don't have the time to get that done before the Tach Race!

That is true Ron.
Here is a pic of the rear of mine.
I also enlarged the intake for more air flow.

Yeah, I want to do that too, nobody has answered my original question as to how to properly press the spray bar out! Very Happy

nitroairplane Wed Dec 14, 2011 1:32 pm

cribbs74 wrote:
nitroairplane wrote:
cribbs74 wrote:Good idea Nitro, unfortunately I don't have the time to get that done before the Tach Race!

That is true Ron.
Here is a pic of the rear of mine.
I also enlarged the intake for more air flow.

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. lol!

**Cribbs74** Wed Dec 14, 2011 1:40 pm

nitroairplane wrote:
cribbs74 wrote:
nitroairplane wrote:
cribbs74 wrote:Good idea Nitro, unfortunately I don't have the time to get that done before the Tach Race!

That is true Ron.
Here is a pic of the rear of mine.
I also enlarged the intake for more air flow.

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.

crankbndr Wed Dec 14, 2011 1:46 pm

Another way to say it would be to turn the vent hole 75 degrees from strait forward, almost sideways.

**RknRusty** Wed Dec 14, 2011 3:11 pm

crankbndr wrote: Another way to say it would be to turn the vent hole 75 degrees from strait forward, almost sideways.

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.

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.

microflitedude Wed Dec 14, 2011 3:14 pm

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?

**Cribbs74** Wed Dec 14, 2011 6:04 pm

Done!

That was so easy that I feel stupid for even asking the question.

microflitedude Wed Dec 14, 2011 6:42 pm

cribbs74 wrote:Done!

That was so easy that I feel stupid for even asking the question.

So how did you do it? Smile

**Cribbs74** Wed Dec 14, 2011 7:06 pm

Popped the black tube piece off, pushed on the brass tube with a plastic drift and out she came!

andrew Wed Dec 14, 2011 8:48 pm

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

**Cribbs74** Wed Dec 14, 2011 9:50 pm

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.

andrew Wed Dec 14, 2011 11:08 pm

Thanks, Ron. I'll read that thoroughly tomorrow.

andrew

**RknRusty** Wed Dec 14, 2011 11:32 pm

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.

crankbndr Thu Dec 15, 2011 7:19 am

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.

nitroairplane Thu Dec 15, 2011 7:22 am

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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