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Some td 0,49 questions

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Some td 0,49 questions

Post  coxaddicted on Wed Nov 14, 2012 9:59 am

Hello,

can somebody tell me if the screw for the prop of a tee dee has the same diameter than the reed valve engines?

And could somebody tell me the overall length of the engine (from backplate to washer)

Thank you in advance!

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Re: Some td 0,49 questions

Post  Cribbs74 on Wed Nov 14, 2012 10:02 am

coxaddicted wrote:Hello,

can somebody tell me if the screw for the prop of a tee dee has the same diameter than the reed valve engines?

And could somebody tell me the overall length of the engine (from backplate to washer)

Thank you in advance!


Yes, the length is different though due to the spinner. Check the instruction manual for dimensions. You can find a copy at CI or EME or Admins site.
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Re: Some td 0,49 questions

Post  EXModelEngines on Wed Nov 14, 2012 10:19 am

The prop screw on a TD 049/051 is a 5-40 x 1". The 5-40 thread is the same as on the reed valve engines, but as Ron stated the length is longer to accommodate the spinner. The length of a typical reed valve screw varies from 1/2"" to 3/4" depending upon the type of driveplate installed and individual configuration.

From backplate to end of driveplate is 1 11/16" long.

Best Regards, Matt
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Re: Some td 0,49 questions

Post  coxaddicted on Wed Nov 14, 2012 10:26 am

Hey cribbs74 and ExmodelEngines,

thank you very much for this informations and the considerably database.

I needed this informations for an mhh... I like to say addlebrained project Very Happy .


Last edited by coxaddicted on Wed Nov 14, 2012 10:27 am; edited 1 time in total (Reason for editing : my english skills :))
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Re: Some td 0,49 questions

Post  ahrma_581 on Wed Nov 14, 2012 4:29 pm

EXModelEngines wrote:From backplate to end of driveplate is 1 11/16" long.

Or approximately 43mm, for our europäischen Freunde.
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Re: Some td 0,49 questions

Post  coxaddicted on Wed Nov 14, 2012 11:29 pm

[quote="ahrma_581"]
EXModelEngines wrote:From backplate to end of driveplate is 1 11/16" long.

Or approximately 43mm, for our europäischen Freunde.[/quote
Hand Shake
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Re: Some td 0,49 questions

Post  coxaddicted on Tue Nov 20, 2012 4:24 am

Another question. Does a cylinder and piston of a reed engine fit on the crank and crankcase ?
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Re: Some td 0,49 questions

Post  navion34 on Tue Nov 20, 2012 2:04 pm

I think it's possible to fit cylinder from a Tee Dee on a reed engine, so the reverse way is also good.
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Re: Some td 0,49 questions

Post  coxaddicted on Tue Nov 20, 2012 2:07 pm

Thats what I want to hear, thank you Hand Shake .

I was not sure.
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Re: Some td 0,49 questions

Post  EXModelEngines on Tue Nov 20, 2012 2:18 pm

Yes, the thread is the same for a reed valve vs. a Tee Dee. I would caution that putting a Babe Bee cylinder/piston on a Tee Dee will decrease power, even though it will fit.

Matt
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Re: Some td 0,49 questions

Post  Cribbs74 on Tue Nov 20, 2012 2:19 pm

Just be aware that even though it's possible. Unless it's a #4 cylinder the performance will decrease some.
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Re: Some td 0,49 questions

Post  coxaddicted on Tue Nov 20, 2012 2:50 pm

Oh yes thats to consider.

What do you think = will a td 0.49 fitted with a normal bee style cylinder have more power than a ,,normal'' baby bee?

I think one of the reasons a td is more powerful than a reed type engine is the rotary valve intake or is this wrong?

I know it is not so easy to compare = The interaction between intake and cylinder has to be respected too.

But if it is so ( a slight increase of highest rpm) it would be a great sucess for my project.
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Re: Some td 0,49 questions

Post  Cribbs74 on Tue Nov 20, 2012 3:33 pm

You can only force so much fuel/air into a single port cylinder. So it may hamper it considerably. I guess you can try it and see. You can get a #4 pretty easily also at the very least maybe you can use a #1 or a surestart cylinder.

Is the #2 cylinder your only option?

Ron

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Re: Some td 0,49 questions

Post  RknRusty on Tue Nov 20, 2012 4:00 pm

cribbs74 wrote:You can only force so much fuel/air into a single port cylinder. So it may hamper it considerably. I guess you can try it and see. You can get a #4 pretty easily also at the very least maybe you can use a #1 or a surestart cylinder.

Is the #2 cylinder your only option?

Ron

Good going, Cribbs. You've become a good engine guy. I've seen several of your replies lately with very good insight into engine operation.

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Re: Some td 0,49 questions

Post  RknRusty on Tue Nov 20, 2012 4:09 pm

coxaddicted wrote:...I think one of the reasons a td is more powerful than a reed type engine is the rotary valve intake or is this wrong?...
That's right. One of the other benefits is the aggressive porting of the #4 cylinder. And the large venturi, through which the flow isn't inhibited by the wasted energy it takes to suck open a reed. And on a tanked engine, there's also the long run through the venturi tube as an added restriction. Some mousers may disagree with that last point.

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Re: Some td 0,49 questions

Post  coxaddicted on Tue Nov 20, 2012 4:10 pm

Hi Ron and Rusty,

thanks for your comments. It was just a general question regarding the cylinder.

The cylinder i would like to use is this one:http://www.exmodelengines.com/cox-.049-medallion-cylinder-piston.html

The reason for this cylinder choice is a muffler with throttle (which fits only with the ground cylinder)

The reason for the questions is, that i am not owning a td 0.49 yet. For me, it would only make sense to buy one if it will fit this ,,ground cylinder''.

I will look for a td 0.49 now and see if it will work.

Who'd have thunk it, I would like to ,,implate'' the td in my kyosho cox car cheers

Thank you for your assistance guys Hand Shake
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Re: Some td 0,49 questions

Post  coxaddicted on Tue Nov 20, 2012 4:16 pm

Ups,

the description says the cylinder does not fit on td`s but on medaillion.

I think I have to go deeper into this ,,dark matter'' of rotary valve engines.
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Re: Some td 0,49 questions

Post  RknRusty on Tue Nov 20, 2012 5:47 pm

That description is only a performance issue, it will "fit." The Tee Dee and Medallion share the same crankcase, but the Tee Dee is a much higher performance engine. For your purposes any cylinder that will screw into one will screw into the other. The stock Medallion cylinder is considerably lower performance than a Tee Dee #4, but the one you are looking at is non-spi, which is the right one if you use a muffler or an exhaust restrictor type throttle.

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Re: Some td 0,49 questions

Post  EXModelEngines on Tue Nov 20, 2012 7:15 pm

Just to clear up a little confusion with that ground cylinder. These were factory ground and fit the older throttle sleeves.

All of the other cylinders we sell will work with the throttle sleeve we sell here:

http://www.exmodelengines.com/cox-.049-throttle-ring.html

This is not to say the throttle sleeve will not work with it, but it will be a little looser.

If you want to you for performance I would recommend this piston/cylinder. This basically equates to the cylinder/piston of a post 1996 TD. You can use a throttle sleeve on it if you would like:

http://www.exmodelengines.com/cox-.049-cylinder-piston-high-performance.html

Matt
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Re: Some td 0,49 questions

Post  RknRusty on Tue Nov 20, 2012 10:10 pm

Matt, would he be better off with a non spi cylinder and the throttle ring, or does it not have the same issue with gulping exhaust gas at TDC as with a muffler. Forgive the dumb questions, I've never used a throttle ring so I don't know much about it.

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Re: Some td 0,49 questions

Post  dckrsn on Tue Nov 20, 2012 10:37 pm

RknRusty wrote:Matt, would he be better off with a non spi cylinder and the throttle ring, or does it not have the same issue with gulping exhaust gas at TDC as with a muffler. Forgive the dumb questions, I've never used a throttle ring so I don't know much about it.
I often wondered that myself.
Sub parr performance using a muffler with spi has always been a given, but
what about r/c throttle mufflers and rings?
I'll give it hell and maybe do a comparison test this weekend. (Emphasis on the maybe).
Bob
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Re: Some td 0,49 questions

Post  EXModelEngines on Wed Nov 21, 2012 7:18 am

RknRusty wrote:Matt, would he be better off with a non spi cylinder and the throttle ring, or does it not have the same issue with gulping exhaust gas at TDC as with a muffler. Forgive the dumb questions, I've never used a throttle ring so I don't know much about it.

In the tests that I have done, using a SPI cylinder with a throttle ring did not have nearly the affect that using one with a muffler did. Then again, I only tested this very very little on reed valve engines with a Black Widow cylinder (has SPI). Testing side by side of SPI vs Non-SPI with the throttle sleeve would probably be good to quantify results.

I tend to prefer the throttle control on the carburetor unit for the TD style engines and the throttle ring for reed valve because you do loose a little power with the throttle ring. Again, everybody has their own setup they like, and sometimes these little engines have a mind of their own!

Matt
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Re: Some td 0,49 questions

Post  John Goddard on Thu Nov 22, 2012 5:17 am

The first few iterations of the Killer B'stard in the Old timer had spi and throttle ring.
If memory serves it held 18.5 dropped to 7, was 'sweet as' anywhere in between
with instant pickup/better than the TD09rc even.
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Re: Some td 0,49 questions

Post  John Goddard on Thu Nov 22, 2012 5:31 am

I think this probably answers a few of the previous questions.....
Again if memory serves this was just before first cox 'powered' flight
running on some really sh/not very good (ie water infused) 15% .

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