RunRyder RC
WATCH
 1 page 477 views Post Reply
Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › TT .39 Running hot
09-04-2006 12:41 PM  14 years ago
Topic Vote0Post 1
Raptormania

rrNovice

Canada

MyPosts All Forum Topic
TT .39 Running hot
I bought a new raptor 30 and a tt .39 engine came with it. I have after running 2 or 3 tanks of fuel through it and it seems like it is idleing well and can lift off the ground well. The engine is getting really hot. I was wondering if this is normal and if anybody knows the setting for a tt .39.

Thanks
SHARE  PM  EMAIL  Attn:RR  Quote
09-04-2006 02:09 PM  14 years ago
joeyM

rrApprentice

langhorne, pa

MyPosts All Forum Topic
I also use a tt.39 in a raptor --it doesnt seem to get that hot--can hold my finger on the backplate a good bit of time before my finger starts to burn---but I was also told that the tt.39 heli engine seems to run on the hot side......how hot are we talking about?---I think my needle is about 1 1/2 or 1 1/4 turns out--i never messed with the low side because it idles fine---i also was told some of these engines run very well and others guys have had problems with.....joecq cq cq de ka3cnc 30 or 40 mtr cw
SHARE  PM  EMAIL  Attn:RR  Quote
09-04-2006 07:34 PM  14 years ago
Hummingbird3D

rrVeteran

California

MyPosts All Forum Topic
Yes, they do tend to run hot. Maybe opening up the low/idle mixture needle will aide in cooling & make sure there are no air leaks thru any part of the fuel line or the gaskets of the engine, glow plug or muffler.

Also do a search for past posts on this subject, the topic comes up quite a bit.
Fly It Like You're On The Simulator!
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-04-2006 07:46 PM  14 years ago
helibandit

rrApprentice

Jacksonville, North Carolina - United States

MyPosts All Forum Topic
yea mine ran hot but i had it pretty rich too. i dont think it was too rich but it did end up blowing up on me. i would save for a OS32. that way you will already have it when it does blow. i was amazed at the feeling of quality with the os 32. the TT39 rattled and gave me wierd vibes. the os 32 is smooth and just sounds like a better motor aside from the fact it has a little more power and a smoother power curve. i went with the non ringed version wich runs about 120.oo i believe
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-04-2006 08:58 PM  14 years ago
Roamer

rrVeteran

Albuquerque, NM

MyPosts All Forum Topic
Ugh. My personal experience with TT39s is not that positive. The problem we always had was that it got hot and leaned out once you had a load on it.

You could lift off with both the high and low needles set so rich the thing would take a full minute to spool up and "clean out", but about two minutes after lift-off, the thing would start to overspeed because it was running hot/lean. Usually, we would have to let it get hot, then land and richen up both needles a bit then quickly get it back in the air and under a load.

Eventually, we ended up modifying the high speed needle to allow us to lean out the low/mid range will keeping the high speed richer. This made a WORLD of difference in how it ran, but it still never ran as trouble free as my OS50SXH.

Personally, I think the altitude here played a large roll in how both engines ran. At 5000ft, the engines need to run leaner than at sea level. The OS50SXH tends to run too lean in midrange down in the thicker air, but up here it was perfect. The TT39 looks like it runs a bit too rich in the midrange at sea level, so up here it is REAL rich (once you get the high speed set right), so by the time you lean the low speed and high speed out enough to actually spool up, the high speed is so lean that once it starts warming up, it goes WAY lean VERY fast. Which makes it get hotter. Which makes it act leaner...

I was very glad when my buddy sold that engine!
SHARE  PM  EMAIL  Attn:RR  Quote
09-05-2006 12:50 PM  14 years ago
Raptormania

rrNovice

Canada

MyPosts All Forum Topic
TT .39 Running hot
Thats for all the info Guys. Yesterday I tried it again. I opened the low speed on 3 turns but could not get the heli to stay going, so i turned it in a half a turn and the same thing, then I turned it in a quarter turn and it sounded and ran very nice. There is a good trail of smoke but it still seem like the engine is still getting hot. I'm not sure how hot these engines are suppose to get. I had a Nexus 30 with a OS SX 32 in it and it never used to get near as hot as this one. I can touch the muffler or the head because it is to hot. The body of the engine i can put my finger on it for about 5 seconds but it is still prety not. I was wondering if they all get hot like this or will I do damage? The engine is flying great but it is hot. Can someone let me know what they think, Thanks
SHARE  PM  EMAIL  Attn:RR  Quote
WATCH
 1 page 477 views Post Reply
Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › TT .39 Running hot
Print TOPIC

 6  Topic Subscribe

Friday, December 4 - 5:16 pm - Copyright © 2000-2020 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online