Home grown throttle rings

Indra,

Is that brass tubing of the correct diameter? Or do you split it with the hacksaw and then JB the snap ring on?

cribbs74 wrote:Indra,

Is that brass tubing of the correct diameter? Or do you split it with the hacksaw and then JB the snap ring on?

correct diameter for the ones it fits over but for the stepped cylinders it must be splits.
But it is very important that you get the a good fit or idle will not be satisfying.

Gotcha! Off to the hardware store then......

The hacksaw is to cut a groove for the snap ring I presume?

Will you be selling Ron?

cribbs74 wrote:Gotcha! Off to the hardware store then......

The hacksaw is to cut a groove for the snap ring I presume?

I usually JB weld it in place otherwise it rotates.
Indra

So you just need to find tubing that fits over the cylinder? It's that simple?

microflitedude wrote:So you just need to find tubing that fits over the cylinder? It's that simple?

Yes.

microflitedude wrote:Will you be selling Ron?

I guess that depends if they are easy to build and proffessional enough looking. If I had a lathe then it would be easier to make some real nice ones.

If they turn out Matt I will make you a couple for free. I am about to move, buy a house etc. So it may be a while.

I looked into doing it for an 09 before and it was around $100 for tooling and like $50 for a 6 ft piece of material.

Matt

EXModelEngines wrote:I looked into doing it for an 09 before and it was around $100 for tooling and like $50 for a 6 ft piece of material.

Matt

That sounds reasonable, what stopped you? Or am I missing something?

Not enough demand perhaps?

Guys its not that simple

is the description from a youtube vid and is not my words

LostMyAirplane on Apr 5, 2009

These rings must be custom fit to each cylinder, and fit very close to do their job properly. I had to make, and buy, special tooling to accomplish this task. It's just not worth it if you're only going to do a few engines. Not all of the rings will make an engine stall, but most of them will idle less than 5500 rpm.

https://www.youtube.com/watch?v=gtw8nqJHGfQ

VERY CLOSE FIT in fact cox precision ground each one I dont have any nearby nor do i have my measuring instruments

Bernie sells some he got made I'm sure he knows about the tolerances

Thats off, I have made about 6 of them
From brass I got from the LHS and online.
It is a tight fit at frost but as the engine warms up so does the brass.

cribbs74 wrote:

EXModelEngines wrote:I looked into doing it for an 09 before and it was around $100 for tooling and like $50 for a 6 ft piece of material.

Matt

That sounds reasonable, what stopped you? Or am I missing something?

Not enough demand perhaps?

Not enough demand and I would be hand making each part which would be labor intensive. They are really not too hard to make, just have to figure out if they will fit a cylinder Cox ground or a regular one with the black oxide.

Matt

nitroairplane wrote:Thats off, I have made about 6 of them
From brass I got from the LHS and online.
It is a tight fit at frost but as the engine warms up so does the brass.

What size?

I tried the tubing and they did not work very well. The fit was too loose and the low idle was not very good. I used C&H brass tubing that was at the local hardware store. I think if they were split and then soldered to size they would work better.

Jason_WI wrote:I tried the tubing and they did not work very well. The fit was too loose and the low idle was not very good. I used C&H brass tubing that was at the local hardware store. I think if they were split and then soldered to size they would work better.

You think the expansion caused some of the issues?

Just my tuppence worth...

Based on my recent fun and games I think rudimentary is a very kind adjective for this type of throttle.
However
In my quest for 'Johnnie making the mistakes so you don't have to'.....
Now I know I've got a spare 15 cylinder I'm gonna fire up up the medallion 15 RC to see whether it 'throttles' any better than my 049 medallion did.
Frankly it can't be worse and my neighbours were mostly at work yesterday so they need a proper 'treat' this weekend.


P.S.
Is brass the ideal material to use?

A good coxaholic would time the initial fire up in conjuction with the neighbors alarm clock, for the best effect.............

Let us know, my guess it will throttle the same as the smaller guys.

cribbs74 wrote:A good coxaholic would time the initial fire up in conjuction with the neighbors alarm clock, for the best effect.............

Let us know, my guess it will throttle the same as the smaller guys.

I'm so dissappointed. I thought I WAS their alarm clock

Here's another approach that has been used by several from RCU when that group was very active. It requires little machining and materials are readily available.

Silicone Muffler/Throttle