turbo or not

[Error401]

I'm not real sure. All I can say is I changed fuel and the temps dropped. Here's what I run as far as plugs, Duratrax Carbon and Gold, OS 8, and NovaRossi Blues (1 and I didn't like it much). Blue Thunder 20% Race. All of my engines smoke, run great (most of the time) and temp out at about 250-270 (depends on the engine). I use a Raggedy Shack temp gun, but it checks out with a RayTec gun.

I used to have a hyper 21 8 port w/ PS, and sometimes it would run a little hot (280-300) with the Gold plugs (hot rated). Sometimes it wouldn't. One thing to check for, is cracks in the bottom of your tank. I cracked on one time and it would get all wigged out, run hot (300) and die at about 1/2 tank. A small rock or something got under it and cracked it. replaced the tank and it ran fine again.

I ran an Ofna Picco 26 in my lightning too. it ran fine and within temps (250-270).

I assume that there's no scoring or anything in the cylinder. Also, have you pulled the backplate to see if everything is ok in the crank case (rear bearing, crank, etc). What does the exhaust oil look like (clean, drak, black)? How much runtime is on the mill?

 

[vbgagnon]

about 9 tanks. Its pretty much brand new. I broke it in 5 tanks very rich and never full throttle. It never got hot I could pick it up by the cooling head. But for the next 3-4 tanks its just real hot. I don't have a temp gun yet but my gt engine never got to this temp.

VB

 

[RoadRunner]

Originally posted by jon2
Hey Roadrunner

I spoke to OFNA personally and they told me to use a MC-9 or MC-59. But I have the engine I stated in a few posts up. They told me I needed a long plug which are the two plugs I just stated. If I am not mistaken the Os # 8 is a shorty.

Jon

Yup. Trinity will tell you the same thing. I don't give a rats ass what they say, I'm a true believer of the OS # 8 plug. I've been in this hobby for many years and have been told lots of sh^%! about engines and plugs. I always go back to the OS#8. tO ME, they are tried and true. Start askin around. There are many that will back me up. Theres just something about these plugs. I will never use another unless I have no choice.

 

[vbgagnon]

alright then I'm gonna pick up some os#8 and try that. HOpe it works because i don't want to cook the engine...I haven't even had it for a week yet!!!!

VB

 

[jon2]

I use to use the same OS plug in my TT21 and it didn't hold a tuner as well when I went to the MC-9 and MC-59. I guess that I will just have to let you guys in. I know the OS plugs are pretty common for the fellow enthusiast. I just stayed with what I knew worked. I am pretty curious as to how the OS # 8 and the Mccoy Plug will work on my hyper mill.

 

[Error401]

vbgagnon,

I'd richen it back up and run some more tanks thru it. It might just be taking a little longer to wear in. The engines do need to get up to temp to wear in (above 250 is excessive during break in) and you should sneak up on the tune. I've heard the Sirios take upwards of a whole gallon of fuel to get broken in (they still scream before that, but after a gallon they wake up). Also, take a paper towel and note the color of the exhaust oil. It will be a darkish color until it's broke in. if it stays the same, or gets darker and the temps stay high, there's someting wrong with the mill. I'd also go to a cold plug, or drop in an OS 8. I broke my Sirio in on an OS 8 and it did real well during break in. If the oil clears up, but the temps are still high, try another blend of fuel. Stay with the same nitro content, just try another flavor.

 

[RoadRunner]

Originally posted by vbgagnon
alright then I'm gonna pick up some os#8 and try that. HOpe it works because i don't want to cook the engine...I haven't even had it for a week yet!!!!

VB

You are not gonna cook anything so long as it has a nice trail of smoke. Keep this in mind and good luck..

 

[vbgagnon]

Thanks alot guys I'm gonna get the os 8 and run a few more tanks. Hopefully this takes care of the problem. Thanks again

VB

 

[zoeybadm]

Originally posted by Error401
vbgagnon,

I'd richen it back up and run some more tanks thru it. It might just be taking a little longer to wear in. The engines do need to get up to temp to wear in (above 250 is excessive during break in) and you should sneak up on the tune. I've heard the Sirios take upwards of a whole gallon of fuel to get broken in (they still scream before that, but after a gallon they wake up). Also, take a paper towel and note the color of the exhaust oil. It will be a darkish color until it's broke in. if it stays the same, or gets darker and the temps stay high, there's someting wrong with the mill. I'd also go to a cold plug, or drop in an OS 8. I broke my Sirio in on an OS 8 and it did real well during break in. If the oil clears up, but the temps are still high, try another blend of fuel. Stay with the same nitro content, just try another flavor.

Error401, is dead on here. I used the McCoy plugs and had problems with them and finally I bucked up and switched to the OS 8 and a lot of my problems with holding a tune went away and the plugs lasted longer.

I had to try a number of different fuels before I found one that produced good power and the lowest temp. What I do when I race is fire the mill up take it around the track slow for about 2 minutes check the temp and visual of the smoke trail and adjust it (lean it out) until I still see a good stream of smoke and can clear all the jumps. Then I check the temp and dial it back down (richen) the HSN until I still have enough power to clear the triples and I still see a nice stream of smoke when I hit the gas.

As long as you have good throttle response and a nice steady stream of smoke the mill will be fine. Have fun!

 

[Jeff Cain]

Use a long plug to get you ignition pattern to start flush with the cylinder head, the short plugs start your ignition up in the glow plug hole just a tad. Try the O'Donnel 99 plug.

COMBUSTION CHAMBERS:

Mopar discovered that when the spark plug fires in a combustion chamber the fuel burns from the point of origin (the spark plug) in a circular direction horizontally. This direction the fuel burns is known as the flame front. They also discovered that the fuel burns in more linear fashion from the spark plug toward the piston. This is the reason they produced the Hemi. A hemispherical combustion chamber burns the fuel more efficiently than any other type.

Most of our engines have a hemispherical combustion chamber. That's kind of a cool bit of trivia because you can tell people your running a Hemi in your buggy. The real reason I explained this is to point out the importance of the shape of the combustion chamber. If you use a OS plug the shape of the combustion chamber is altered and power is lost because the flame front is messed up. The shorter plug also reduces the compression of the engine. I know that was a lot of explanation for a simple point but it's important that you run the correct type of plug in the head.

Here's a good post about plugs: http://www.rc10gthobby.com/~mystracing/RaceFrame1Glow_Plugs.htm

Also, it's a 'turbo' engine because the pull start mechanism has an impeller of sorts on it, not because it uses turbo plugs. (Check the exploded diagram that came with you Hyper 21 8 port) The non-pullstart version doesn't have said impeller.

 

[jon2]

I spoke to OFNA recently about this mill and was told that the engine I posted a link to is NOT A TURBO engine. THey do however use long plugs.

 

[ZANDOR]

long plugs dose any one have a link to this plug. so i should be running a long cold plug? what is the mc59s long or short

 

[Ryhton]

It would be the long, check the link

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXBLX2&P=7

 

[dgrobe2112]

Ok, here is another bit of info.. the Ofna 8 port motor while fast.. needs to be sealed.. meaning.. seal the back plate.. seal around the carb.. make sur no holes in your fuel tubing.. even the line to the pipe.. very hard motor to tune..

Also.. you are using a temp gun to tune your motor.. no need for that.. mainly cuz they can be off.. unless you use a high dollar exergen, which is the ones i have seen the closest.. but still are different to each other.. so.. with that said.. your running it at 290?? could be off by 30-40 degrees.. either way.. so your either hot.. ot just right.. you gotta tune to smoke.. if you ahve a trail of smoke out the stinger.. then you are good to go..

The Ofna hyper motors all have the black head on them now.. if you bought that car new.. it had a plastic purple piece on the head.. you have a Ofna Hyper 21 8 port motor..

Ofna uses long plugs.. if you use a OS plug in this motor.. your tune will be messed up.. basicaly cuz you are lowering the compression in the chamber.. by shortning the plug.. you can use Novarossi plugs.. or RB plugs.. i would go with a mid range plug.. Like a RB6 or something like that.. but you need to run a long plug.. if you switch between long and short.. you will be messing your self up.

As said before.. 5 tanks.. not enough break in.. at least 6-8 tanks of fat running.. to break in the 8 port motor.. they are very tight motors.. hard to break in.. but you need to get at least 6-8 tanks for break in.. also.. some motors dont fully break in until after 1 gallon.. and you will notice a power difference.. and temp difference....

I have a RB WS7II, and got bout 1.5 gallons in it.. and the thing is getting faster.. and cooler..

dont worry bout your motor.. its a good motor.. and you said 290, while hot.. is not gonna kill the motor.. you need to get a new plug.. long plug.. fatten each need prolly about 1/2 turn.. cuz my bet is running it lean.. popped the plug..

When you take out your plug.. look at the coil.. is it wet looking around the coil.. or dry and dark?? if its dry and dark.. your too lean.. if its wet looking.. then you gotta know.. alot of wet.. or little.. or what.. should be wet.. from fuel.. but not too wet..

Sorry for the long post.. just wanted to get the info i know out there.. and thought it may help.. shoot.. copy and paste it into word.. and print it up..