Pipe reduced stingers...

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Wasted wages

Wasted wages

Well-Known Member
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Joined
Jan 2, 2006
Messages
2,760
I've never tried one...are they only needed for certain situations...?

Anyone care to explain the how's and why's of using a reduced stinger in a tuned pipe ?

How do you go about sizing one ?

Thanks guys !
Frank
 
Terry, I saw a few pictures that you detailed making a reduced stinger...soldered on a ring etc.

But what is the reason for extending the length of the stinger tube to the weld band of the pipe?
 
Wasted wages said:
Terry, I saw a few pictures that you detailed making a reduced stinger...soldered on a ring etc.

But what is the reason for extending the length of the stinger tube to the weld band of the pipe?
Click to expand...

The stinger length should coincide with the pipe volume for best performance ,,I forgot the formula but their is a thread here somewhere about this..would have to search.
 
Ahhh....that's cool!! :cool:

So, is it just trial and error as far as the diameter? or are there a few hard and fast laws of physics that apply ?

Trying to wrap my head around why this is even done... is it as simple as Brad stated?
 
Wasted wages said:
Ahhh....that's cool!! :cool:

So, is it just trial and error as far as the diameter? or are there a few hard and fast laws of physics that apply ?

Trying to wrap my head around why this is even done... is it as simple as Brad stated?
Click to expand...

Brad is right and there are other reasons also ,reduced stinger can also help in cooler weather and larger stinger in warmer weather,,, stinger size can also have affect on carby size or spraybar size ..
 
Wasted wages said:
I've never tried one...are they only needed for certain situations...?

Anyone care to explain the how's and why's of using a reduced stinger in a tuned pipe ?

How do you go about sizing one ?

Thanks guys !
Frank
Click to expand...

WWages FYI. Courtesy of Jim Allen (passed 🙏)

Stinger length & stinger inside diameter both will effect the engine's operating temperature. However, increases or decreases in diameter will have a much more pronounced effect on the engine's operating temperature than increases or decreases in stinger length. In order for any tuned pipe to be able to give a high boost pressure, without a heat problem, the tuned pipe being used "MUST" have an adequate volume compared to the displacement of the engine. A factor of approximately 26+ times for nitro engines to approximately 32+ times for gas engines will allow the use of longer, smaller internal diameter stingers.

Consider the fact that the stingers I use on my 26 cc QD engines are .4062" ID X 5.5" in length. The gas engine's operating temperature is approximately twice what would be found in a nitro engine of the same size. I use a toroidal head with a volume of less than 1 cc & a deck clearance of 002". The measured tuned pipe internal pressure is 120" of water or 4.336 psi. at WOT.

Jim Allen

Last edited by a moderator: May 2, 2016
 
Last edited:
We did lots of tests on stinger diameter for gas engines. Some basic things we found was the diameter needed to be increased for higher flows at higher rpm. Inverted stingers developed the same power as the standard stinger. We used screw in stingers with the same length as the baffle cone. The length is much less important than diameter, but inverted stingers need to go to the wide portion of the pipe. There was some thought that stinger size should be varied with outdoor temperature, but we didn't test this. A good way to vary stinger back pressure is with a changeable venturi like the drawing below.

Lohring Miller

Nozzle.gif
 
Joe Warren said:
increase pipe pressure to tank
Click to expand...
Please be careful when putting a lot of pressure to the fuel tanks as I have had a person put to much
pressure to the tank and it ballooned up and broke the tub the tank held pressure but it destroyed the boat
The person said he knew he had a lot of pressure because when he started the boat he could see the tank
balloon when he raced the engine. This person was a experienced boater learned a valuable lesson.
Walt Barney
Tanks 2 U
 
Lohring has it on the money. Jim Wilson did our stingers the same
way. The Venturi effect in the stinger really makes the returning fuel charge go back to the engine with more speed and velocity. ”Our engines are really dual intake engines with a correctly designed tuned pipe“. Jim and Jack really spent a lot of time in tuned pipe discussions on the phone. A tapered reduction in the exhaust port can have a very similar effect as well. Lots to play with if you have time and the machining capability. Another thing to play with is measuring tuned pipe volumes in cc’s, and trying to match the correct pipe volume to the correct engine volume. So much to do and so little time to do it all. Test, Record, and Test Some More.

Some Things To Think About Fellas,

Mark Sholund
 
The biggest factor of stinger diameter is fuel pressure. It was
Much more important years ago when carbs had very small spray bars. As we went up in nitro and power we needed more fuel.
Carb bore & spray bar bore & stinger bore all have to work together.
Other factors matter as well. But those 3 are very important and the more RPM and power you make the more important they are.
 

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