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
» Starting a G-Mark .03
by MauricioB Today at 4:51 pm

» cox 049 parts needed
by robot797 Today at 3:19 pm

» car engine diesel???
by robot797 Today at 3:15 pm

» **VOTE-ON-THE-NEXT-COX-ENGINE-OF-THE-MONTH** (October 2018)
by akjgardner Today at 1:56 pm

» Happy birthday Oldenginerod
by akjgardner Today at 1:50 pm

» Throttle question
by GallopingGhostler Today at 11:29 am

» Admitting stupidity in a public place
by Dave P. Today at 7:47 am

» Recent engine acquisitions
by Levent Suberk Today at 4:42 am

» Fleet Trainer plan
by Dave P. Yesterday at 8:18 pm

» babee bee parts
by Cox International Yesterday at 4:29 pm

Cox Engine of The Month
October-2018
Mudhen's

"Prototype T.D. .010 c.1960"



PAST WINNERS
Speed Contest 2018
CEF Traveling Engine

Win This Engine!
The Traveling Prop
Gallery


World of Aviation

Tee Dee / Muffler questions

Go down

Tee Dee / Muffler questions

Post  Cox International on Wed Aug 01, 2018 12:13 pm

From a German customer. Any insights from you guys and gals?

1. I know normally shouldn t use muffler on TD051 or TD 049, because they have Sub Piston Induction, the muffler will reduce the performance, right? But I really saw some TD051 has muffler, why?

2. I have TD051, I use the muffler which I bought from your shop, runs very hot, I install 2-3 timing shims, but still very hot. What I can do? The reason is from the muffler?
avatar
Cox International
Diamond Member
Diamond Member

Official Cox Dealer
Posts : 2636
Join date : 2011-08-08
Age : 60
Location : Williams Lake, BC, Canada

View user profile http://www.coxengines.com

Back to top Go down

Re: Tee Dee / Muffler questions

Post  fredvon4 on Wed Aug 01, 2018 1:34 pm

Too many variables to diagnose HOT running

Head
Prop
Fuel mix
Cowl
crank to nose fit
Piston fit

From my inter netting it seems MOST agree Mufflers and SPI slightly reduce top RPM but I have never read that the engine also ran very hot

ask customer for more data
avatar
fredvon4
Diamond Member
Diamond Member

Trusted Seller
Posts : 2489
Join date : 2011-08-26
Age : 63
Location : Lampasas Texas

View user profile

Back to top Go down

Re: Tee Dee / Muffler questions

Post  Cox International on Wed Aug 01, 2018 2:04 pm

Thanks and we have sent a link to our customer so that he may monitor the thread and post if he wants.
avatar
Cox International
Diamond Member
Diamond Member

Official Cox Dealer
Posts : 2636
Join date : 2011-08-08
Age : 60
Location : Williams Lake, BC, Canada

View user profile http://www.coxengines.com

Back to top Go down

Re: Tee Dee / Muffler questions

Post  1/2A Nut on Wed Aug 01, 2018 2:45 pm

Sounds like he is running the stock round muffler with no header just a breather hole.
He needs non spi cylinder or that type of muffler will just kill the spi function and cause the
engine to draw in more exhaust heat back into the crank case. The TD RC muffler would allow
more expansion volume but still hinder SPI.

Small Cox Logo July-27 Small Cox Logo
avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1944
Join date : 2013-10-20
Age : 55
Location : Brad in Texas

View user profile

Back to top Go down

Re: Tee Dee / Muffler questions

Post  fredvon4 on Wed Aug 01, 2018 3:02 pm

I have run many Medallions with the Muffler and adjustable NVA and each has some SPI...they do not generate the same PEAK RPM as a open carb /exhaust .049 medallion but only by a few hundred RPM

I always us minimum 25% nitro up to 35% with 24% to 28% oil mostly castor with some 5% to 10% synth

Cylinder head shims and different plugs to find the reliable sweet spot...to date since 2012 (when I came back) I have only blown up 4 engines due to over max RPM....none in the air or on the bench ran HOT...once I polished the crank or got compression correct
avatar
fredvon4
Diamond Member
Diamond Member

Trusted Seller
Posts : 2489
Join date : 2011-08-26
Age : 63
Location : Lampasas Texas

View user profile

Back to top Go down

Re: Tee Dee / Muffler questions

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