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"Black Lynx .049 with a Throttle, Exhaust Deflector and Nelson-Galbreath head set"
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Tee Dee / Muffler questions
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Tee Dee / Muffler questions
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?
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?
Cox International- Diamond Member
Posts : 2710
Join date : 2011-08-08
Age : 60
Location : Williams Lake, BC, Canada
Re: Tee Dee / Muffler questions
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
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
fredvon4- Diamond Member
Posts : 2654
Join date : 2011-08-26
Age : 63
Location : Lampasas Texas-
Re: Tee Dee / Muffler questions
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.
Cox International- Diamond Member
-
Posts : 2710
Join date : 2011-08-08
Age : 60
Location : Williams Lake, BC, Canada -
Re: Tee Dee / Muffler questions
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.
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.
1/2A Nut- Diamond Member
- Posts : 2096
Join date : 2013-10-20
Age : 55
Location : Brad in Texas -
Re: Tee Dee / Muffler questions
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
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
fredvon4- Diamond Member
-
Posts : 2654
Join date : 2011-08-26
Age : 63
Location : Lampasas Texas -
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