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"RC car's modified Tee Dee"




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Post  balogh Tue Dec 01, 2020 9:18 am

Thanks Brad. Did that. Just tached at 22.7k as best with a medium hot plug. Added a 2nd shim and tached near 22k.The stock head with 1 shim tached 5 minutes later at 24k. All this with 20% nitro and stock 3 bladed COX prop. What do you think?


Last edited by balogh on Tue Dec 01, 2020 9:19 am; edited 1 time in total
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Post  fredvon4 Tue Dec 01, 2020 9:18 am

I see Nelson adapters coming soon.

I just ordered 3  Kamtechnik Turbo >049/.051 heads
What is the consensus on a good Turbo plug for 25%, 35% nitro in a TeeDee

Yes Virginia I am searching here and reading what I find

And link to source please

Edited in..Funny, I searched every where for this that I remember reading and it ended up being in THIS thread...

"RP6 Med. TD .049 / QB / .09 / .15 (good idle 25% nitro) Blew a plug at 33.7k rpm undecided if this is a issue yet.
RP7 Cool TD .049 (*best with tuned pipe) / QB / .09 / .15 no issues perfect with high nitro.

RP8 Cold (tuned pipe or 45% - 60% high nitro) Yes will be tested with a TD .15 / Mark II with RC carb."

Now to find sources for small quantities


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Post  Kim Tue Dec 01, 2020 9:29 am

@fredvon4 wrote:I see Nelson adapters coming soon.

I just ordered 3  Kamtechnik Turbo >049/.051 heads
What is the consensus on a good Turbo plug for 25%, 35% nitro in a TeeDee

Yes Virginia I am searching here and reading what I find

And link to source please

Right along with you Fred...already got Pay Pal warmed up this morning!
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Post  1/2A Nut Tue Dec 01, 2020 10:26 am

24k with the 3 blade what was it just at 24?
It's a good number will unload 28k fantastic power.
You can try a hotter plug with the .020 / #4
1 shim keeps it simple / may need two with the 4.5x2 I did.
Just depends on the engine condition. How other add on parts
effect the engine. Recommend the aluminum backplate for a cooler
case hard mount with a center prop sings higher notes. I like the
aluminum carb body too.

This time of year air temps / moisture content will come into play of course.
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Post  balogh Tue Dec 01, 2020 10:33 am

Thanks Brad. The 24k is with stock COX head. The turbo head peaks at 22.7k under the same conditions. Will try a hotter head but I think it is premature ignition already with the medium plug that pulls the rpm down. The filament in the stock head is much thinner and radiates less heat than the mefium turbo plug, that may therefore cause excessively early ignition timing?
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Post  1/2A Nut Tue Dec 01, 2020 10:35 am

All testing was done with a 4.5x2 and venturi.

I also tested #4 for throttle RC carb and sleeves. Yes colder plug
may be the ticket, will have to play around with the 3 blade, let
us know what works best.



Tee Dee .049 / Kamtechnik Turbo Plug Adapter / APC 4.2x4
23,498 rpm / 7.8oz thrust / .120 hp - 89w / 90 mph pitch speed
OS RP7 / 2 head gaskets / 15% nitro / ACE NV / Throttle sleeve
SPI / stock venturi.

Update 1 head gasket 24,386 rpm.



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Post  1/2A Nut Wed Dec 02, 2020 6:52 am

See example chart depending on shim count, time of year, elevation, air temp and precipitation power can be improved.
Winter maybe here but we can all enjoy setting up our engines.

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Post  Marleysky Wed Dec 02, 2020 12:19 pm

These are the ones I bought off that auction site.  Some are like 3 for $35 plus shipping, these are less than $6 each.

Hey Brad! Thanks for the Temperature chart...that’s gonna come in handy!  

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Post  1/2A Nut Thu Dec 03, 2020 1:52 am

Most welcome Marley and good find on price.

I saw those last night but wanted some of these / 3 in the mail for my TD .15:

https://www.ebay.com/itm/New-O-S-RP8-Turbo-Glow-Plug-On-Road-Cold-Turbo-3-pcs-71642080-OSMG2715/173633555487?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2648

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Post  getback Thu Dec 03, 2020 5:24 am

First off Thank You Brad for all the research you have done , this is a Big help to get the most from our engines with the tubo / Kamtechnik replacements . Does anyone know what heat range the Cox glow heads are? Snowman
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Post  1/2A Nut Thu Dec 03, 2020 7:27 am

Thank you Eric, which turbo plug adapters are you using?

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Post  getback Thu Dec 03, 2020 7:40 am

None at this time i was just making a statement , But want bee long and i am going to order myself a few Christmas presents Very Happy
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Post  fredvon4 Thu Dec 03, 2020 9:36 am

logic sez cuz Cox recommended 25% to 35% nitro the heads were medium to cool/cold in two configurations, high compression and very high compression controlled by copper shims
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Post  fredvon4 Fri Dec 11, 2020 11:36 am

My Kamtrechnic .049/.051 Turbo Plug adapters arrived yesterday

Made me seek out status on my 3 Gold plated P6 turbo plugs never seen this broad a arrive dated spread...18 Dec 2020 ~13 Jan 2021.....so I looked and they seller has a US warehouse and a Hong Kong shipping center...bet they are coming from Asia....Kool no sweat these are to make interesting , semi unique,  good looking TeeDee display engines


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Post  Tee Bee Sun Dec 13, 2020 10:56 pm

The USPS finally found my little package and made good on delivery today. As usual, I’m pleased with Greg’s artful work! Testing will have to wait a while but I had to slap the new setup together for some inspiring eye candy.

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Post  getback Mon Dec 14, 2020 5:26 am

@fredvon4 wrote:logic sez cuz Cox recommended 25% to 35% nitro   the heads were medium to cool/cold in two configurations, high compression and very high compression controlled by copper shims
This make sense Fred and i just went back to Wiki,, #302 Pre 1955 Standard Head - Hemispherical shape - Low Compression - Smaller dia. threads - used on Space Bug, Thermal Hopper, Space Bug Jnr and Strato Bug Only.[27]
#302-1 Post 1955 Standard Head - Hemispherical shape - Low Compression - Larger dia. threads - used on all engines produced post 1955 until the #325 head was produced in 1979.[27]
#325 Standard Head - Hemispherical shape - Low Compression - Larger dia. threads - used on all post 1956 engines except Tee Dees, QZ, Killer Bees, Venom and Texaco. Replaced 302-1 head in 1979. There are several different exterior appearances to standard glow heads, all noting a slightly different internal shape, compression and glow coil heat.[28]
#1702 Hi Compression Head - Trumpet shaped - High Compression - knurled top - 4 fins on early, 3 fins on later (fastest), 2 fins on most recent - used on Tee Dees, Killer Bees, QZ and Venom. differences range from 4 fin heads being high compression dome shaped to high compression trumpet shaped.[29]
#315 Texaco Head - Hemispherical shape - Low Compression - 5 fins - used on Texaco Engine only. Supposedly allows greater cooling for engine when swinging larger propellers.[30]
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Post  getback Mon Dec 14, 2020 5:27 am

Good deal TeeBee did you get that stand from Jason ? Very Happy Looks Good Small Cox Logo
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Post  Tee Bee Mon Dec 14, 2020 11:57 am

Yep. That’s Jason’s work. The CEF is THE place for ALL the cool bits.
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Post  fredvon4 Tue Dec 15, 2020 9:20 am

Yaro, in Canada, has a good discount on Nelson Tap and die set or individule


http://aerohobby.ca/store/index.php?main_page=index&cPath=14
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Post  dckrsn Tue Dec 15, 2020 5:54 pm

@fredvon4 wrote:Yaro, in Canada, has a good discount on Nelson Tap and die set or individule
http://aerohobby.ca/store/index.php?main_page=index&cPath=14
Hey Fred, thanks for that. Lots of
good stuff there.
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Post  emanuel Mon Jan 04, 2021 6:55 am

Finally arrived safely today, I was already confused because the usps tracking on December 23rd. in Frankfurt has reported the traffic jam delivered. Very Happy
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