Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!


Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» .15 glow head shapes...
by ffkiwi Today at 4:51 pm

» Did someone here get the Black SB jr. ?
by Admin Today at 3:20 pm

» Home made air filter for COX TeeDee09
by 1/2A Nut Today at 2:58 pm

» Ordered a 1/2A Skyray kit
by TLAnderson Today at 2:47 pm

» PIYURIN .010
by 1/2A Nut Today at 2:13 pm

» Take a look-see at what I got bottom fishing on Ebay
by ffkiwi Today at 8:15 am

» New Limited Edition Engine
by GallopingGhostler Today at 8:13 am

» Used RR1 for $121
by aungmyatoo Today at 3:57 am

» My Southridge CNC Hyper Viper build
by getback Today at 2:33 am

» Recent engine acquisitions
by getback Today at 12:49 am

Cox Engine of The Month
March-2019
Jason_WI's

"Cox Pee Wee .020 with 3D printed horseshoe backplate"

More info on this engine!


PAST WINNERS
Speed Contest 2018
CEF Traveling Engine

Win This Engine!
The Traveling Prop
Gallery


World of Aviation

Tee Dee 0.020 Carb Body at an angle - is it normal?

Go down

Tee Dee 0.020 Carb Body at an angle - is it normal?

Post  steveod21 on Sat Mar 16, 2019 2:10 pm

Hi Everybody

Could I ask for some help regarding a Tee Dee .020?

When replacing a cracked red plastic throttle body, I noticed that the crankshaft window in the crankcase appears to be machined at an angle, so that the carb body,
and venturi, leans to the right looking from the front.

Has anyone seen this before? Is it normal that some engines are like this?

steveod21
steveod21
New Member
New Member

Posts : 2
Join date : 2019-03-16

View user profile

Back to top Go down

Re: Tee Dee 0.020 Carb Body at an angle - is it normal?

Post  JennyC6 on Sat Mar 16, 2019 2:40 pm

LArger engines with the carb mounting boss cast integral to the crankcase don't have that, but I can't imagine it'd affect anything here. The induction timing is set by the position of the port in the crank relative to the crankpin, so as long as the A/F mix can make it from the venturi to the crankshaft when the port in the crankshaft is facing upwards it should run just fine.

I can't imagine there's a way for that port to 'walk', so if it was running fine before the old retention ring cracked itt'l run fine with the new one.
JennyC6
JennyC6
Beginner Poster
Beginner Poster

Posts : 8
Join date : 2019-03-05
Location : Mid TN

View user profile

Back to top Go down

Re: Tee Dee 0.020 Carb Body at an angle - is it normal?

Post  aspeed on Sat Mar 16, 2019 2:59 pm

I would say the machinist was in a hurry and didn't put the case on the fixture straight. It will affect the opening and closing of the intake timing. It looks like less than 2 degrees, so no big deal. At most it will like a bigger prop.
aspeed
aspeed
Bronze Member
Bronze Member

Posts : 48
Join date : 2013-01-19
Location : Leamington Ont. Can.

View user profile

Back to top Go down

Re: Tee Dee 0.020 Carb Body at an angle - is it normal?

Post  steveod21 on Sat Mar 16, 2019 11:21 pm

Thank you for your help. I was surprised to see this and thought 'well it must be right as Cox engines are so well made'!
You would think that quality control would have picked this up and scrapped the part!
I haven't run it yet but will keep the forum informed.

Many thanks once again.
Steve
steveod21
steveod21
New Member
New Member

Posts : 2
Join date : 2019-03-16

View user profile

Back to top Go down

Re: Tee Dee 0.020 Carb Body at an angle - is it normal?

Post  gkamysz on Sun Mar 17, 2019 2:53 am

steveod21 wrote:Thank you for your help. I was surprised to see this and thought 'well it must be right as Cox engines are so well made'!
You would think that quality control would have picked this up and scrapped the part!

The only parts that were held really tight are the piston to cylinder fit. The rest has general machining tolerances, which of the era weren't great compared to what we see now. Very likely there was no machinist involved in the part above as things were highly automated. Without today's automated inspection, spotting defects like this would be near impossible.

It's definitely more than 2°, 6-7° but still not enough to matter, much.
gkamysz
gkamysz
Silver Member
Silver Member

Posts : 68
Join date : 2018-02-23
Location : Chicagoland

View user profile

Back to top Go down

Re: Tee Dee 0.020 Carb Body at an angle - is it normal?

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum