What plug do you run for the Axial .28.

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Larsenracing

Larsenracing

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Worthington, MN
Hey guys I have a Axial .28 on one of my trucks. The motor was uses slightly, it has a CEN #3 plug in it which I traided it out for a McCoy MC-9 plug and the truck ran way worse. It wouldnt hold a tune then switched back to the CEN plug and was great again. my problem is I can't get the CEN's locally.

Just wanted to see what everyone else was running in them. I could order if needed or have my LHS order if I wanted to.
 
I have tried

odonnel medium

mc 9

axial's medium

all about the same performance. imo

I do notice a tuneing difference when I change fuel brand. wierd
 
crash said:
I have tried

odonnel medium

mc 9

axial's medium

all about the same performance. imo

I do notice a tuneing difference when I change fuel brand. wierd
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Crash don't you think you would see some difference in these plugs you listed as the MC-9 is a cold plug where the others are medium.

The CEN plug seems to be a touch shorter than the MC9's. I also think the CEN #3 plus seems to be medium or something. I just cant find any real information on it.
 
larsenracing said:
Hey guys I have a Axial .28 on one of my trucks. The motor was uses slightly, it has a CEN #3 plug in it which I traided it out for a McCoy MC-9 plug and the truck ran way worse. It wouldnt hold a tune then switched back to the CEN plug and was great again. my problem is I can't get the CEN's locally.

Just wanted to see what everyone else was running in them. I could order if needed or have my LHS order if I wanted to.
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Hey buddy, I have an axial 28RR in my on road car and I,ve had the same problems. I stumbled on a new glow plug from a company called SK Motion. Its a cold plug pt#1418006, give this one a try. It works awsome in my axial and its been the only one my engins likes. You might want to give this one a try. www.SKmotion.com
 
Are yoyu guys running short or long plugs. The plug that was it the truck when I got it was a CEN #3 which I stated above. I just got an email back from CEN they say this plug is a hot short plug same as the O.S. A5.

I guess I thought this motor was supposed to run a long plug. Eitherway this thing runs good with this plug I'm skicking with it.
 
larsenracing said:
Are yoyu guys running short or long plugs. The plug that was it the truck when I got it was a CEN #3 which I stated above. I just got an email back from CEN they say this plug is a hot short plug same as the O.S. A5.

I guess I thought this motor was supposed to run a long plug. Eitherway this thing runs good with this plug I'm skicking with it.
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Most of the big block engines run a long style glow plug. A short will work but you are lowering the compression a slight bit. If your having problems with long plugs the one suggestion would be to add a head shim. Make sure the plug sits flush with the dome in the combustion chamber. I have seen some racers having problems when the copper washer under the plug flattens out and the plug sits deeper into the combustion chamber causing higher compression and the fuel doesnt ignite properly. Make sure you use a new washer when installing the plug and check the depth when the head button is off and you just have to experiment.
 
Nitronut- that was my thinking about loosing power with the short plug. I'm going to try a long hot plug and see how much different it runs then move colder from there. I am trying to find out from the guy I bought it from if he has removed any head shimms, so hopefully I will know soon.
 
ya it is and I have it and it's on there web site. It still doesn't show anything and isnt always what you need to run as we are all at different altatudes and all have different climates so they need to fine a happy median for everyone.
 
larsenracing said:
ya it is and I have it and it's on there web site. It still doesn't show anything and isnt always what you need to run as we are all at different altatudes and all have different climates so they need to fine a happy median for everyone.
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One thing to also keep in mind is that the heat range of the plug is also responsible for ignition timing. A colder plug will retard timing untill rpm increases thus increasing heat making fuel burn quicker at higher revs making more power in the upper rpm range. A hot plug ignites fuel faster at lower revs giving you better punch off the line but makes the engine sometimes fall flat at the upper range because of preignition actually working against the piston to try and force it back down before TDC (top dead center).

IMO you should match your plug to your fuel. low nitro=hot plug and high nitro=cloder plug
 
Yes I am right there with you buddy. But I need to do some trial and error first as I am running Bryon 30% and when I switched to the correct plug MC-9 (Long Cold Plug) it ran like crap. It wouldnt stay running in the low end and wouldnt hold a tune at all. So I am going to try the hot long plug as i have a few of them and then go colder from there. This will show if there is something going on with this engine and long plugs. As it ran great with a hot short plug. This isn't the plug that should be ran in it.
 
larsenracing said:
Yes I am right there with you buddy. But I need to do some trial and error first as I am running Bryon 30% and when I switched to the correct plug MC-9 (Long Cold Plug) it ran like crap. It wouldnt stay running in the low end and wouldnt hold a tune at all. So I am going to try the hot long plug as i have a few of them and then go colder from there. This will show if there is something going on with this engine and long plugs. As it ran great with a hot short plug. This isn't the plug that should be ran in it.
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One thing I forgot to ask is "hows the compression", does the engine have good pinch? If it doesnt you my need to use a hot plug to make up for the lack of heat building up in the combustion chamber.

Also what temps are you running in outside? That will have allot to do with it.
 
It has great compression and the pinch seems about like just after break in. I ran it in our shop which was about 60-65 Deg.
 
Ya don't worrie I got some more playing to do as I only have about 3-4 tanks on the truck since I got it from the guy and I'm waiting on an email from him to get more information from him as to why he had that plug in it.
 
Allright, just to fill in my latest information here. I had installed a Racers Edge medium plug #RCESF4 which is a long plug. This engine really likes this plug. I am still running my Bryon's Race 30% fuel. However keep in mind my ambient temps are right around 50* and below in the shop I'm running in so this spring I will probably switch to cold plugs like I should be at.
 
larsenracing said:
Allright, just to fill in my latest information here. I had installed a Racers Edge medium plug #RCESF4 which is a long plug. This engine really likes this plug. I am still running my Bryon's Race 30% fuel. However keep in mind my ambient temps are right around 50* and below in the shop I'm running in so this spring I will probably switch to cold plugs like I should be at.
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That sounds like a good plan Bro! I have been running a cold plug on trinity 30% and haven't had a single flame out even in the coldest weather. The byrons fuel is great and you should stick with it.

See , the plug makes a world of difference!
 
groovethumper said:
O.S. #8, works great, lasts longer than anything else i've used. Peace.
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the os 8 is a great plug if your flying an airplane, its too short and causes your engine to lose compression and has trouble holding a steady idle. at least that what i get out of it on both my maxxes. my picco hates it
 
The guys i race with are the peeps who got me into this hobby,have all ways told me the plug doesnt have any thing to do with the temps and says that the hotter and colder thing is just about detonation and timing,hotter being a early detonation and colder being later.It kinda makes sense to me as i live in florida and run the same plug year round.I,m not saying thats true i,m not smart enough to know one way or the other,but it does seem to work like that for me.i,m running the axial 28 with a med cold plug.
 
destructive said:
the os 8 is a great plug if your flying an airplane, its too short and causes your engine to lose compression and has trouble holding a steady idle. at least that what i get out of it on both my maxxes. my picco hates it
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It's in my O.S.30VG, what you got under the hood?
 
windjammr said:
The guys i race with are the peeps who got me into this hobby,have all ways told me the plug doesn't have any thing to do with the temps and says that the hotter and colder thing is just about detonation and timing,hotter being a early detonation and colder being later.It kinda makes sense to me as i live in Florida and run the same plug year round.I,m not saying thats true i,m not smart enough to know one way or the other,but it does seem to work like that for me.i,m running the axial 28 with a med cold plug.
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The plug does in fact have a bearing on the engine temp for the fact that if ignition timing is advanced the combustion temps will be slightly higher due to the fuel burning more completely during combustion process. In reality its only going to be a few degrees if your running rich but you in fact could run into problems when tunning for utmost performance.

The rule is
High nitro content ( over 20% )= cold to medium plug on a typical big block at air temps over 60F.
Med nitro content (15-20%)= medium plug at the same temp.
Low nitro content (below 15%)= hot plug at same temps.

If the temp outside is below 60F you could go ! step hotter or allow the engine to warm up for a longer period of time.

Hope this helps. This info was what I was taught from MANY engine manufactures.
 
NITRONUT said:
The plug does in fact have a bearing on the engine temp for the fact that if ignition timing is advanced the combustion temps will be slightly higher due to the fuel burning more completely during combustion process. In reality its only going to be a few degrees if your running rich but you in fact could run into problems when tunning for utmost performance.

The rule is
High nitro content ( over 20% )= cold to medium plug on a typical big block at air temps over 60F.
Med nitro content (15-20%)= medium plug at the same temp.
Low nitro content (below 15%)= hot plug at same temps.

If the temp outside is below 60F you could go ! step hotter or allow the engine to warm up for a longer period of time.

Hope this helps. This info was what I was taught from MANY engine manufactures.
Click to expand...

Nice job put buddy.
 
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