Where's the magic pipe that just runs?

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Andy,

any chance you can get a picture off some of these homemade Frankenstein ppes?? Maybe that will encourage me to open up the chop shop. How are you keeping them joined together?? Soft aluminum welding??

Rules,

I'll check out that stuff, my compuer is a little old so downloading isn't always that simple. Hopefully, it can handle it.

 

[TimD]

So Andy,

Are we likely to see an AB car pipe for the buggy engine? B)

Tim.

 

[Mike T.]

Andy's got that right - the nitro motors are so highly tuned that they work well or hardly work at all - but working well is where the speed is. You have to walk that fine line just trying to keep up. The pipe is just part of the system. Cut back on the port and rotary valve timing and it would be a whole lot more predictable, but 20 mph slower. Most of the gas engines aren't to that point yet - that's why we get away with what we do.

 

[Preston_Hall]

Pipes aren't too bad once you consider what you might spend in props. It's a never ending battle to win the speed war.

 

[AndyBrown]

Tim D. Yes I am. I now have lots of Frankenstine 1/8 Buggy pipes around here.

I have spent the last year learning what power curve works best for the buggy's.

Getting close.

Also on the finiky Nitro engines. The Nitro is more sensitive to variables than Gasoline. Years ago we all raced with 40%. Now it is mostly 60% which becomes more critical. With the "relativly" larger carbs that are used on current nitro engines we add to this critical situation.

 

[[email protected]]

Andy,

can you add some pictures of these pipes?

 

[Bob Kensill]

I have seen Andy run one of these "Frankenstine" pipes. It was cones held together with fiberglass cloth and epoxy. It was a "20" size pipe.

 

[der_steuermann]

Regarding the Java Tuned Pipe Designer, I'd like to recommend this tool. Dr. Martin Hepperle is well known for his famous MH airfoils for pylon racing and other speed applications...

The download of this program is not mandatory, you may just "play" online...

http://www.mh-aerotools.de/airfoils/javapipe_en.htm

The pic below shows a custom built tuned pipe for my pylon plane - based on the data of the Java applet.

View attachment 2018

 

[ClayGlover]

The pic below shows a custom built tuned pipe for my pylon plane - based on the data of the Java applet.

very nice.

I'm playing with the program, and I'm presuming that the "port angle" parameters it's asking for are the port timings in degrees. Now to figure exhaust temps... :blink: hey Lohring, can I borrow your datalogger?

 

[der_steuermann]

I'm presuming that the "port angle" parameters it's asking for are the port timings in degrees

RIGHT

The program also considers pipe calculations for gassers...

 

[[email protected]]

I htink I saw that site one time before, Is this site in English? I ask before I go opening it because sometimes these sites crash my computer.

 

[Slideblues]

Dear Puzzled in Pacifica

Try my five step program to outboard nirvana

1) verify that your timing is stock (not hyped out already)

2) verify that header length and stinger length is stock (not already double cut)

3) setup prop shaft level with sponson bottoms or 1/8" above

4) dont over prop it the Rossi's love ta rev

5) take two asprin and call me in the morning

Gene

Oh yea, Test......Test.......Test

 

[[email protected]]

Dear Abby,

....errr....wait...Dear Gene,

HAHAHAHAHAHHA that's good!!! :lol: :lol:

But it's gonna take a lot of aspirin for this engine....... :lol:

 

[Eric Canto]

The very nature of a tuned pipe dictates that it will make an engine MUCH more difficult to run than an open exhaust. Have you ever been out to the local R/C airplane field and seen a bunch of guys fighting motors like you see at the boat pond? Of course not, and the tuned pipe is a large part of the reason why. If you want an easy to operate, long lasting, nitro motor, just put an appropriate muffler on it and have fun!

 

[CySlyde]

i know what happened to the magic pipe, and it has somethign to do with the jamacans they bought all the could find and umm oh sorry that's teh worng pipe isin' t it

 

[[email protected]]

Cyslyde, definitely the wrong pipe.....LOL :wacko: :wacko:

 

[Scott Schneider]

Rodney, FYI. A lot of the newer engines are coming with quite long open duration Exhaust timings and a lot of the pipes are built around engines with more conservitive timings. CASE IN POINT IS: The more Ex duration you have the longer the pipe typically is. So take a pipe thats already short in tuned lenth for a more mildly tuned engine and put it on an engine with more radical ex timing and you get a super high RPM engine with NO TORQUE !!

Only 2 things you can do. #1 is add some header lenth to get some torque or

#2 is to prop small ~~ very small?? and twist up the engine like hell !!

Those "HOT" props your buddys are using are not for this set up ! Scott

 

[[email protected]]

Scott,

no it's not a radical prop. Here's what I'm gonna work on. My Phil Thomas sport .40 has a Precision in Perfection .45 engine and a PIP pipe. Set up w/an X-1452 two blade prop. Right now that's the best hook up prop. The pipes set exactly at 10 inches. Speed wise it's still of pace of the other sport .40's in my class by about 4-6 mph, that's a big differenc.

I picked up a new MAC's pipe, a used CMB and a used OPS pipe. I'm looking for any others if the price is right any condition to. I'm gonna test my stock motor and the moded motor. (I have two) this way I can test all the pipes, various lengths as well as props. People are saying they can run a 457, that's an enormous prop, that's what's on my 1/8 scale. I think I could get up to a 1455 with some more adjustments. I'd really like to find a nitro pipe and see how that would run compared to all the muffled pipes.

 

[Scott Schneider]

Rodney, Well in a lot of cases 10" long on a .45 engine is kinda short, except on a MAC with andys pipe. All the Picco's, CMB's I ran for years liked to have the pipes at @ 10 5/8" to 11" :huh: And ran in the 24,500 to 26,000 range with 176 /178 degree Ex timings.

As far as pipes go those typically built by Mac's, Irwin, and the italians are all the same basic pipe and only the muffler can being added makes the differance.

Running big props @57mm or so I would loose no sleep over not being able to use.

Those bigger wheels cause worse handling than a smaller wheel would and with that being said comes the real trick ~~~~~~~ Find a size of prop that the engines can pull threwout the rpm range, don't worry about top end speed yet ~~~~~~ once you find the prop that the engine likes then you work on making "THAT" prop more effiecient.

If you are really paying attention you will find that the fastest guys are most likely running modified props.

Lastly, Need some .45 pipes to try ? Give me a call some night @ 8:00 or after and I can set you up with some.

Can modify some props too when you get close to what your boat likes.

B) Scott

 

[[email protected]]

Scott,

I sent you a PM....I can't find the distric roster so I don't have your number handy, I'll send you mine feel free to call.