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Cox Tee Dee 049 High Performance Cylinders

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Old 05-01-2011, 08:49 PM
  #26  
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Default RE: Cox Tee Dee 049 High Performance Cylinders


ORIGINAL: GeorgeG97322
I think Bernie and his support group have the metalurgy better accounted for now.
I don't understand how you've come to that conclusion, if they are simply grinding on an old stock of surestart cylinders...
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Old 05-14-2011, 08:30 AM
  #27  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

Back from holidays

I have read the thread and agree that the desscription of the cylinderis ambiguous.

I have therefore amended the listing details to more clearly reflect the product description:

http://coxengines.ca/product.php?pro...&cat=13&page=1

Bernie
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Old 05-14-2011, 09:41 AM
  #28  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

Thank you for clarifying the text.
It would be good if you could update the image too so that it shows the actual product fort sale, rather than the classic #4 TD cylinder.
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Old 05-14-2011, 11:50 AM
  #29  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

Wow, you have good eyes lol.

As I did not think there was a visible difference from the outside, I took the easy route and used an old TD cylinder picture. But, I'll take a pic on Monday of the actual part

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Old 05-14-2011, 05:52 PM
  #30  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

I suppose I’m missing something, but it seems that Bernie’s image could very well be a reworked SS, while it certainly can’t be mistaken for an original TD #4. See photos.
Al
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Old 05-14-2011, 09:25 PM
  #31  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

The first image is an original TD #4 cylinder, you can see the lower part of the number that is stamped in the port on the right, rather than below the port as it is on some other models.
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Old 05-15-2011, 01:12 AM
  #32  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

Mr. Cox, I should have acknowledged in my previous post that your ascertain that the images were of a TD #4 was of course correct and moreover it was confirmed by Bernie. It’s just that I can’t see any semblance of a ‘4’ in either of his two images. And of my several TD 049/051’s the external configurations are all identical to the one in the photo, (other than being stamped with a 4 or a 5). Mine are obviously a different (earlier/later?) configuration. You do in fact have a keen eye.
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Old 05-15-2011, 01:33 AM
  #33  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

I don't know about the keen eye, but I do have newly prescribed glasses...

The reduction of the outer cylinder diameter was on the earlier version I believe. Not sure about the purpose of the reduction, reduced weight perhaps, it was dropped on later models perhaps to reduce the number of machining steps. You'll find similar shape changes on the early Pee Wee and Babe Bee engines too.
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Old 05-15-2011, 07:01 AM
  #34  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

Started thinking about the history behind the cylinder outer shape. I guess they started with a thin wall all the way apart from a lower lip to seal against the crank case. Then came the version where it is thicker around the ports, either to reduce distortion when warmed up or/and to reduce distortion when using the dis-assembly tool in the ports, and/or enabling a throttle ring around the exhaust ports. Then finally the latest version with thick walls all the way. I think all engine sizes underwent this development, all the way up to the .15.
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Old 05-15-2011, 08:24 AM
  #35  
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Default RE: Cox Tee Dee 049 High Performance Cylinders


Alright, new pics are now shown of the actual product and, yes Mr. Cox, you do have keen eyes

The #4 cylinders we received from Cox a couple of years ago are 100% identical inside and out compared tothe Surestart ones with the following exceptions:
    [*]#4 stamped inside one of the exhaust ports.[*]Open exhaust ports as opposed to the slit version. Also, the port was cut a bit bigger (deeper); inducing SPI
    [/list]Hence my logic for being lazy and using photos from an old TD cylinder listing.

    Bernie
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Old 05-15-2011, 11:03 PM
  #36  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

So when can we buy the teedee05 carbs?
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Old 05-16-2011, 06:36 AM
  #37  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

I just got back from holidays on the weekend and there is a box of carb parts waiting at the office that my competitor Matt sent me (we split the loot). However, I believe there are no servo arms andwe will need to source them first. I`ll have a look later today when I get to the office.

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Old 05-16-2011, 10:12 PM
  #38  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

Thats ok Bernie, I understand. I however don`t need the control arm to survive, a carb without the control arm will do nicely.  I retrofit a control arm for an 05 not long ago and would be more than hapy to do it again for my own so I can get some testing in.

I have been holding off ordering the other parts I need  from you guys so I can minimize shipping.

Hook me up please...................
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Old 05-17-2011, 10:03 AM
  #39  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

I have not yet had time to go through the box of parts to see what part(s) is/are missing. Once that I am caught up with my current backlog I will do so.

The price of lying on sunny beaches for 3 weeks lol.

Bernie


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Old 05-17-2011, 10:12 PM
  #40  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

OOOOOOh the dreaded woeful sunny beaches are to blame eh.....chuckle...........everybody deserves a break every so often, .........forgiveness pending backlog time delay`s endurance,,,just kidding lol
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Old 05-18-2011, 06:52 AM
  #41  
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Default RE: Cox Tee Dee 049 High Performance Cylinders

Bernie and other COX .051 TD Cobblers

The information in the attached Web Page may provide some food for thought about Exhaust ports, SPI, Bypass and booster ports. http://www.ancientalley.com/ancient/...nome/gnome.htm

Just kidding! Enjoy!
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Old 12-31-2018, 06:48 PM
  #42  
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Default Large SPI gap

I know this is an old post.
Originally Posted by Cox International View Post
The SPI piston was very hard to start and didn’t compare with the stock piston BECAUSE it was cut too short.
The SPI gap with the modified piston in either the stock or modified cylinder was almost “three times” greater than
that of the stock TD piston and cylinder. Too much air was allowed under the cylinder. I also think the large gap
affected the engine’s timing.

I am not sure SPI actually does much based on my testing.

When the "SPI" is too large, the manifold vacuum that was built up inside the crankcase is released,
and airflow through the venturi significantly decreases.

If the engine uses a venturi to draw the fuel into the engine, there is an insufficient amount air being pushed
through the venturi to create the low pressure used to draw fuel inside the venturi, unless an electric starter
is used. (In some cases an electric starter will not help).

If the engine uses a bladder, too much fuel will be delivered to the venturi, and not enough air will be pushed
through the venturi, unless an electric starter is used.

SPI or "Free Porting" works on all 2-stroke engines. It works because of outside pressure being exposed
to the crankcase. That outside pressure pushes inert gas into the crankcase and prevents the loss of fuel-
air mixture out the exhaust port, that 2-stroke engines are famous for. With SPI more fuel is burnt and converted
to power.

Without a muffler it works with atmospheric pressure, and requires the piston to momentarily expose the crankcase.
With a muffler, the pressure is greater, and so it may require the piston to overlap the bottom of the exhaust port.
But just because the exhaust port is closed, doesn't mean that the bottom of the piston is sealing the crankcase
from the pressurized exhaust.


Bill M.

Last edited by wmazz; 12-31-2018 at 07:01 PM.
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