Beowulf

Could the wrong type of fuel cause glow plugs to go out immediately once you try and run a car? If so, do any of you think running Trinity Nitro Power Platinum, 20% race blend in a Hyper 7 PBS would cause the glow plugs to go out right away?

I know that glow plugs would also go out very fast if the mixture is too lean. For the factory settings it says I need to put the barrel stop at 1/16th air gap. How many turns is that?

polstery

Could be the wrong plug, what engine and plug do you have. That fuel should be fine

Beowulf

I've got the Hyper .21 8 port motor, and I am using MC9 Power plugs

Model Mania

I m not familiar with the mc9 plug but I think u should try a colder one if the MC9 isn't already a cold plug.

polstery

You have an air leak. That engine has them all the time, try a search someone must have told how to seal it up.

Beowulf

I checked for any air leaks, couldn't find any. I tried another mc9 and that one blew as well. I have the second plug that came with the car, I'm gonna try that one soon. I'm still thinking that it's the needle settings, but the friend I am with won't let me touch them at all

scale only 4 me

My Feedback: (158)

an Air leak is a good guess
so is it's running to lean

What does the plug look like when it comes out of the engine?
is the engine new, is this the break in we're talking about?

The MC9 is a cold plug, I use the mc9s with 30% nitro in my buggy and Dominator
and the mc59 with 20% nitro, the mc9 shouldn't be going out early. I usally geat about 7-10 runs on a plug before they start getting bad.

nolimit208

I use the O'donnel 099 plugs in my Rody tuned Rb Concept C5 buggy engine and they seem to last for ever. I just change them out every race. Try them and see if the problem continues

Po Kid

On my XXX-NT, plugs last like 2 gallons!

Beowulf

scale, it's not running at all. I'll start it on the bumpbox but it will turn a couple times at most and stop. The flywheel just stops dead in it's tracks and won't budge. From my limited knowledge, it seems like it's a combustion thing.

The plug, when I take it out of the engine, is wet with fuel. Not soaking wet but it has fuel on it nonetheless. The engine is new, but it has already been broken in by the former owner.

I'm going down to my local hobby shop tomorrow, I'm taking the car with me to see if they might be able to figure out why the flywheel stops and won't budge when the piston reaches the high point in the rotation.

polstery

now its flooded, turn it over with the plug out to get rid of the extra fuel thats locking it up. Then put the plug back and she should start.

scale only 4 me

My Feedback: (158)

from your new disrciption it does sound flooded, but also the hyper 8 ports are very tight engines until you get about 5-6 tanks of fuel through them. The piston locking up at TDC(top dead center) is very comon with a new engine. It's not only compression that makes the engine tight, but "Fit". Fit is the piston/sleeve having almost zero tolerance at TDC, this loosens up after break in.

Are you saying you can't get it to run because the box won't turn ober the engine at all?
I thought you were have glow plugs going out?
Or do you have both problems?

If i was running 20% I'd use a mc59, it's a little hotter of a plug

Also try polstery's suggestion, take the plug out and put it on the starter box until fuel stop coming out of the engine. Then I would put the neddles back to factory settings and start over. Keep in mind the factory setting are for the break in so it will be very rich,

When you try to start it again,if you can, get the wheel spinning before you push the car all the way down, do this in short pushes. When I was breaking in mine, I had to push down on the box and pull the pull start cord to get it to turn over. Now that I have about 10 tanks and one race day it turns over on the box very easy.

good luck

scale only 4 me

My Feedback: (158)

Come on?? No way
Not even the best plug in the most perfectly tuned engine can make this claim

k-carboy

ive seen it done. in fact i had over 3 gallons on my novarossi c-6 plug in the P-5 motor before i changed it (including break-in!). i never changed it because i wanted to see how long it would last, but we had a big race coming up so just to be safe i changed it.

i used to go through the plugs like everyone else and then i learned how to tune a motor. that really helped.

scale only 4 me

My Feedback: (158)

I guess I'll believe it when I see it

Po Kid

Us poor folk use a plug til it blows up! And yes, for the entire life of any particular engine, I use about 3 plugs most for like 4 or 5 gallons. That uncludes my Traxxas pro .15, and my O.S. CV-R. Also, I have ran my XXX_NT's engine for about two gallons and its the stock plug. Sometimes I change the plug if Im not sure why the engine is running wierd or something, but the ones I take out almost always still work, so I just save em in my RC Box until I really need em, or a newcomer at the track's plug dies and he doesnt know why it wont start.

Beowulf

The glow plugs going out too fast was my original problem, but I figured out why it was doing that and fixed it. But now I have this new problem where the box won't turn over the engine when it reaches TDC. I'm definately going to get some different glow plugs when I go to the hobby store today.

cooch1189

My Feedback: (1)

try mc8 glow plugs thats what i run with the odonnell 20% race blend

Beowulf

I bought some MC59 plugs today. They glow normally. Here's my current problem. I can start it going while on the bumpbox just fine. But as soon as I let up on the bumpbox, it dies. I can't seem to get it to go on it's own. Any ideas?

Po Kid

Hrmm, raise the idle speed or lean the low end.

nitroman88

My Feedback: (5)

i think i only changed glow plugs three times this past racing season in my o.s. .12 cv-r

Beowulf

*sigh* I don't have the faintest idea why this still isn't working. Tried both the MC8 and MC59 glow plus, with both plugs the engine didn't turn over on it's own. Once the ignitor charges back up I will try the MC9.

When I have the glow plug out, the engine will turn over just fine. When the glow plug is in, I have to make sure it's at the bottom of the cycle. I know that's because the engine is tight, but this engine was already broken in when I got it.

I do have one question though. On the idle screw, it says the factory default is 1/16th air gap. Where exactly am I looking to make sure it is 1/16 air gap?

Beowulf

Just found out from the owner that he had installed a OS 20E carb on the Hyper .21. Only reason I didn't see this right away was because I was under the impression it was still the stock one.

scale only 4 me

My Feedback: (158)

OK, laymans terms
take off the air filter and look inside the barrel/venturi, you'll see a large hole when open/full throttle and a small sliver of that hole when closed/at idle. that sliver of an opening is what they are talking about. that is adjusted with a screw on the side of the carb body

Beowulf

hrmm, well I don't know what I did different than the last time I tried, but it works now. Now I get to tune it :P