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COX .049 CYLINDER ?

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COX .049 CYLINDER ?

Post  oldguy on Mon Feb 22, 2016 12:59 pm

iF I NEED TO BUY A PISTON CYLINDER SET FOR A COX .049, SHOULD I BUY THE Cox .049 Tee Dee Cylinder and Piston SET.
tHANKS jIM
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What to buy

Post  Marleysky on Mon Feb 22, 2016 2:13 pm

why not?  If you just need a p/c any new or lightly used set should do. The TD piston/cylinder has extra boost ports, the "standard" cylinders don't.  If your trying to build a race engine the TD is the way to go. If your flying a 1/2a model the lesser expensive slit cylinder/ piston should do nicely.  Others opinion(s) may vary.  
Tired w/ Coffee Read

Here's a good place to start reading: https://www.coxengineforum.com/t9349-td-049-051-cylinder-double-or-single-booster-is-better?highlight=Cylinder+selection


Last edited by Marleysky on Mon Feb 22, 2016 2:25 pm; edited 1 time in total (Reason for editing : More info;)
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Re: COX .049 CYLINDER ?

Post  pkrankow on Mon Feb 22, 2016 3:02 pm

The transfer ports are the same in the new cylinder offerings from Bernie at
http://coxengines.ca/
or Matt at
http://www.exmodelengines.com/

The porting has 2 sets of transfer ports, between the exhausts. There is a large transfer and a smaller single boost port. This is the best available porting for any year of manufacture, and is supposed to be better than the cylinders that have 2 boost ports per transfer port.

The TD cylinders are remachined Sure Start cylinders to lower the exhaust porting to give SPI and open the exhaust port further than with the bar.

If you are running a throttle or muffler then SPI is not wanted. Either the throttle will not operate, or an exhaust gas recirculation state will be set up. (note: EGR is not THAT bad, but it dilutes the fresh fuel charge with exhaust)

If you are running for max power then the SPI will increase power due to more air entering under the piston at TDC.

Phil
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Re: COX .049 CYLINDER ?

Post  oldguy on Mon Feb 22, 2016 3:42 pm

oldguy wrote:iF I NEED TO BUY A PISTON CYLINDER SET FOR A COX .049, SHOULD I BUY THE Cox .049 Tee Dee Cylinder and Piston SET.
tHANKS jIM

I think I should have ask the question, should I install a Tee Dee c/p set on my a golden bee if it needs a set for best performance?I know there are different # cylinders for different cox .049 and .051's.If i need a new set would the TD be the way to go for the GBee?No throttle used on a c/l 1/2A.
Sorry guy's.
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Re: COX .049 CYLINDER ?

Post  pkrankow on Mon Feb 22, 2016 4:07 pm

oldguy wrote:
oldguy wrote:iF I NEED TO BUY A PISTON CYLINDER SET FOR A COX .049, SHOULD I BUY THE Cox .049 Tee Dee Cylinder and Piston SET.
tHANKS jIM

I think I should have ask the question, should I install a Tee Dee c/p set on my a golden bee if it needs a set for best performance?I know there are different # cylinders for different cox .049 and .051's.If i need a new set would the TD be the way to go for the GBee?No throttle used on a c/l 1/2A.
Sorry guy's.

That is one choice. It is a pretty good choice from a performance point of view based on your plans. I would also read the "Gibeault Mouse Race Program" paper found here
http://coxengines.ca/engine-and-fuel-guides.html

Phil
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Re: COX .049 CYLINDER ?

Post  crankbndr on Mon Feb 22, 2016 6:55 pm

I used to like the Sure Start cyl. with the shortened piston but I see they are gone. Black widows #1s would be good and the price is right at EX.
(they probably look much better that the photo)

http://www.exmodelengines.com/product.php?productid=17859&cat=267&page=1


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Re: COX .049 CYLINDER ?

Post  oldguy on Mon Feb 22, 2016 7:12 pm

crankbndr wrote:I used to like the Sure Start cyl. with the shortened piston but I see they are gone. Black widows #1s would be good and the price is right at EX.
(they probably look much better that the photo)

http://www.exmodelengines.com/product.php?productid=17859&cat=267&page=1



That's an option.What difference in power rpm wise is between the 2 c/p set's?
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Re: COX .049 CYLINDER ?

Post  oldguy on Mon Feb 22, 2016 7:15 pm

Also if  I wanted a back plate for and .049 which one of these is the best to use?
Jim


Last edited by oldguy on Mon Feb 22, 2016 9:27 pm; edited 2 times in total
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Re: COX .049 CYLINDER ?

Post  roddie on Mon Feb 22, 2016 7:42 pm

oldguy wrote:Also if  I wanted a back plate for and .049 which one of these is the best to use?
Jim

You mentioned the C/P is for a Golden Bee? There were (I believe) different back-plates. The venturi was enlarged at some point; late-production before it was replaced by the Black Widow. The earlier Golden Bees had the standard .062" opening.. like the Babe Bee model. I have two Golden Bees and one has a back-plate and matching tank venturi that measures .082". If yours has the larger.. it would breathe better with a high-performance cylinder/piston.


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Re: COX .049 CYLINDER ?

Post  oldguy on Mon Feb 22, 2016 9:32 pm

oldguy wrote:Also if  I wanted a back plate for and .049 which one of these is the best to use?
Jim


I meant one of these types.Cox .049 Killer Bee High Performance Backplate Assembly one I can use an external tank or bladder.






Cox .049 Killer Bee High Performance Backplate Assembly




Features:

Durable Plastic Backplate

High Performance Mylar Reed

High-Flow Molded Design

Vibration Resistant Brass Needle

New Original Cox Items


Last edited by oldguy on Mon Feb 22, 2016 9:42 pm; edited 1 time in total
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Re: COX .049 CYLINDER ?

Post  oldguy on Mon Feb 22, 2016 9:38 pm

roddie wrote:
oldguy wrote:Also if  I wanted a back plate for and .049 which one of these is the best to use?
Jim

You mentioned the C/P is for a Golden Bee? There were (I believe) different back-plates. The venturi was enlarged at some point; late-production before it was replaced by the Black Widow. The earlier Golden Bees had the standard .062" opening.. like the Babe Bee model. I have two Golden Bees and one has a back-plate and matching tank venturi that measures .082". If yours has the larger.. it would breathe better with a high-performance cylinder/piston.



Thank you for that information.I will have to check and see if if the golden bee I have has a small or large back plate and tank.
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Re: COX .049 CYLINDER ?

Post  pkrankow on Tue Feb 23, 2016 7:58 am

The tank can be drilled out with a 2mm or 5/64 drill by hand. Be careful, even though it does not affect the reed seat. I go in from the reed end as it is bigger. I have done this to several tanks (most of my baby bees) it provides a pretty serious hop up even without altering the back plate.

The hole in the back plate alters how the engine behaves quite a bit more. If this is oversize the engine won't draw fuel. I have tried altering these but have had poor results. I don't mess with the back anymore.

Phil
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Re: COX .049 CYLINDER ?

Post  balogh on Tue Feb 23, 2016 11:24 am

oldguy wrote:
oldguy wrote:iF I NEED TO BUY A PISTON CYLINDER SET FOR A COX .049, SHOULD I BUY THE Cox .049 Tee Dee Cylinder and Piston SET.
tHANKS jIM

I think I should have ask the question, should I install a Tee Dee c/p set on my a golden bee if it needs a set for best performance?I know there are different # cylinders for different cox .049 and .051's.If i need a new set would the TD be the way to go for the GBee?No throttle used on a c/l 1/2A.
Sorry guy's.

Just as an encouragement to use TD cylinder on a reedie, here is my Bloody-TeeDee- Reedie-Mary project, my new TeeDeeReedie I put together yesterday from a Killer Bee shaft/backplate and a TD049 piston/cylinder combo...

Will run it in and tach it over the weekend...
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Re: COX .049 CYLINDER ?

Post  oldguy on Tue Feb 23, 2016 11:51 am

balogh wrote:
oldguy wrote:
oldguy wrote:iF I NEED TO BUY A PISTON CYLINDER SET FOR A COX .049, SHOULD I BUY THE Cox .049 Tee Dee Cylinder and Piston SET.
tHANKS jIM

I think I should have ask the question, should I install a Tee Dee c/p set on my a golden bee if it needs a set for best performance?I know there are different # cylinders for different cox .049 and .051's.If i need a new set would the TD be the way to go for the GBee?No throttle used on a c/l 1/2A.
Sorry guy's.

Just as an encouragement to use TD cylinder on a reedie, here is my Bloody-TeeDee- Reedie-Mary project, my new TeeDeeReedie I put together yesterday from a Killer Bee shaft/backplate and a TD049 piston/cylinder combo...

Will run it in and tach it over the weekend...

Thanks for posting will look forward to your post on how it runs.
Jim
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Re: COX .049 CYLINDER ?

Post  pkrankow on Tue Feb 23, 2016 1:22 pm

balogh wrote:
oldguy wrote:
oldguy wrote:iF I NEED TO BUY A PISTON CYLINDER SET FOR A COX .049, SHOULD I BUY THE Cox .049 Tee Dee Cylinder and Piston SET.
tHANKS jIM

I think I should have ask the question, should I install a Tee Dee c/p set on my a golden bee if it needs a set for best performance?I know there are different # cylinders for different cox .049 and .051's.If i need a new set would the TD be the way to go for the GBee?No throttle used on a c/l 1/2A.
Sorry guy's.

Just as an encouragement to use TD cylinder on a reedie, here is my Bloody-TeeDee- Reedie-Mary project, my new TeeDeeReedie I put together yesterday from a Killer Bee shaft/backplate and a TD049 piston/cylinder combo...

Will run it in and tach it over the weekend...

How funny.  I just ripped apart my die-cast engine in that configuration and stuffed all the parts into a good billet case after a light polish of the crank.  The only functional difference is I have a Texas Timer's fine NVA installed.  I have been having a nightmare of an experience with this cast case.  

Maybe I'll get a stable enough engine run to finally fly my 2013 speed contest entry!  (never been flown yet)




Phil
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Re: COX .049 CYLINDER ?

Post  fredvon4 on Tue Feb 23, 2016 1:42 pm

If one needed to re-create a period correct engine combo...Bernie has most of what is needed

BUT.... there is zero reason ...if one is just rebuilding a Cox .049 engine, to NOT use the re-created TeeDee configuration (unless you can not have SPI)... I have a few so called junk sure Starts that are far superior to any baby bee in my stash simple because that bypass and boost port configuration is very good

I have many of Bernie's TeeDee twin by pass singe boost each side .049s that are better and stronger than any old original Golden Bee and Black widow in my collection
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Re: COX .049 CYLINDER ?

Post  oldguy on Tue Feb 23, 2016 1:55 pm

fredvon4 wrote:If one needed to re-create a period correct engine combo...Bernie has most of what is needed

BUT.... there is zero reason ...if one is just rebuilding a Cox .049  engine, to NOT use the re-created TeeDee configuration (unless you can not have SPI)... I have a few so called junk sure Starts that are far superior to any baby bee in my stash simple because that bypass and boost port configuration is very good

I have many of Bernie's TeeDee twin by pass singe boost each side .049s that are better and stronger than any old original Golden Bee and Black widow in my collection

Thanks Fred that.
Jim
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Re: COX .049 CYLINDER ?

Post  balogh on Tue Feb 23, 2016 2:24 pm

fredvon4 wrote:If one needed to re-create a period correct engine combo...Bernie has most of what is needed

BUT.... there is zero reason ...if one is just rebuilding a Cox .049  engine, to NOT use the re-created TeeDee configuration (unless you can not have SPI)... I have a few so called junk sure Starts that are far superior to any baby bee in my stash simple because that bypass and boost port configuration is very good

I have many of Bernie's TeeDee twin by pass singe boost each side .049s that are better and stronger than any old original Golden Bee and Black widow in my collection

It  took me some time to handmatch the TD cylinder with the piston from my parts inventory..I like the initial tight fit and excellent compression left after a mild and juicy run-in ...these are my proven prerequisites of a very long runtime and performance experienced with COX engines that I bow and raise my hat for to COX engines
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Re: COX .049 CYLINDER ?

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