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Pressure tap back plate 049
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Pressure tap back plate 049
I recently bought a Tee Dee and aMedallion .049. Both are new and in the Cox Hobbies, Inc original box. Here's my question; the back plate has a mark for a pressure tap & I don't know if that is a "drill here" location or what...none of my other TD's/Medallions have this feature. Should I drill and tap this or just leave it alone? Any advice..
Thanks guys,
Steve
Thanks guys,
Steve
steve thornton- Bronze Member
- Posts : 44
Join date : 2013-10-06
Location : SE Michigan
Re: Pressure tap back plate 049
I think the mark, if it is in the middle, is just a centerpoint or such left by the manufacturing process in a super fast automatic lathe.
The pressurizing point is on the right side of the carb body, you need to take the engine apart and drill through both the plastic part and the crankcase to make the pressure point operational.
Please note, my first point comes from my background in engineering, the second from the engine manual I have no personal experience on pressurizing, but I know some people have drilled the backplate too.
The pressurizing point is on the right side of the carb body, you need to take the engine apart and drill through both the plastic part and the crankcase to make the pressure point operational.
Please note, my first point comes from my background in engineering, the second from the engine manual I have no personal experience on pressurizing, but I know some people have drilled the backplate too.
KariFS- Diamond Member
- Posts : 2006
Join date : 2014-10-10
Age : 52
Re: Pressure tap back plate 049
steve thornton wrote:I recently bought a Tee Dee and aMedallion .049. Both are new and in the Cox Hobbies, Inc original box. Here's my question; the back plate has a mark for a pressure tap & I don't know if that is a "drill here" location or what...none of my other TD's/Medallions have this feature. Should I drill and tap this or just leave it alone? Any advice..
Thanks guys,
Steve
Steve, I would leave it alone. If it is just a mark, the material in the back plate is not thick enough to support a pressure tap.
As mentioned, the pressure tap on a TD is on the side of the crankshaft housing.
Unless you have a specific need for crank case pressure, you would be much better off using a bladder setup. Using any type of pressure requires you to get a fine-thread needle valve setup.
BTW, here is a back plate made for pressure tap:
George
gcb- Platinum Member
- Posts : 908
Join date : 2011-08-11
Location : Port Ewen, NY
Re: Pressure tap back plate 049
Thanks for the advice George and Kari. I have decided to leave it alone. From what I have read, the benefit to back plate pressure vs the crank pressure is an increased and more consistent pressure. My machine skills are even more undeveloped than my inverted flight skills, so these pretty little engines will remain original.gcb wrote:steve thornton wrote:I recently bought a Tee Dee and aMedallion .049. Both are new and in the Cox Hobbies, Inc original box. Here's my question; the back plate has a mark for a pressure tap & I don't know if that is a "drill here" location or what...none of my other TD's/Medallions have this feature. Should I drill and tap this or just leave it alone? Any advice..
Thanks guys,
Steve
Steve, I would leave it alone. If it is just a mark, the material in the back plate is not thick enough to support a pressure tap.
As mentioned, the pressure tap on a TD is on the side of the crankshaft housing.
Unless you have a specific need for crank case pressure, you would be much better off using a bladder setup. Using any type of pressure requires you to get a fine-thread needle valve setup.
BTW, here is a back plate made for pressure tap:
George
Thanks again for your help!
Steve
steve thornton- Bronze Member
- Posts : 44
Join date : 2013-10-06
Location : SE Michigan
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