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Engine does not warm up unless I lean it.

Engine does not warm up unless I lean it.

Old 11-30-2014, 10:19 PM
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Default Engine does not warm up unless I lean it.

I finally got my Hyper 21 running right after all this time.

BUT, there's still this issue:

It will never warm up unless I turn the HS needle clockwise a 1/4 turn. I have to watch that though. After about 2 minutes, I have to turn it back where it was or it will just keep getting hotter.

Is this the plug?

I've been using a Duratrax carbon medium plug.

Do I need a hotter plug?

If so, what's a good hot plug to use?

Last edited by mercfocus; 11-30-2014 at 11:54 PM. Reason: Correct spelling error.
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Old 11-30-2014, 10:29 PM
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Originally Posted by mercfocus View Post
I finally got my Hyper 21 running right after all this time.

BUT, there's still this issue:

It will never warm up unless I turn the HS needle clockwise a 1/4 turn. I have to watch that though. After about 2 minutes, I have to turn it back where it was or it will just keep getting hotter.

Is this the plug?

I've been using a Duratrax carbon medium plug.

Do I need a hotter plug?

If so, what's a good hot plug tom use?
check your front bearing...
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Old 11-30-2014, 10:37 PM
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Default plug

Try an os #8 plug, they work great for me.
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Old 11-30-2014, 11:51 PM
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Originally Posted by fastchvy View Post
check your front bearing...
I just put in new ceramic front bearing.
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Old 11-30-2014, 11:53 PM
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Originally Posted by jrx2 View Post
Try an os #8 plug, they work great for me.
Looking it up, I see those are also medium plugs.

Maybe they're a hotter medium plug than the Duratrax Carbons?
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Old 12-01-2014, 02:00 AM
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Go a little hotter on the plug, O.S #7 med/hot, hotter plug can help when running in engines, tuning window can be slightly larger & hotter plug can help keep a rich engine run better.
Your engine may not be getting hot because its a bit to rich, just turning one needle won't fix it, you will have to tune using the LSN as well, but before anything, adjust idle gap on carb to between .5 - .7mm, then set LSN so engine idles but is still rich for running in, set HSN to flush so top end is still rich & go from there.
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Old 12-01-2014, 05:27 AM
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Go a bit leaner on the LSN. Sometimes a to rich LSN is giving a lot of cooling and so preventing the motor to get warm. Pre-heating could be a solution.
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Old 12-01-2014, 06:19 AM
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definitely need a hotter plug. O.S. 8 or 7 probably. i run a #7 in my argus .23
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Old 12-01-2014, 11:17 PM
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I remember tunning one of those and that is one of the reasons I hated it. I don't mean to discourage you from trying other plugs or anything else but If I remember right it's just a pain in the butt engine that goes from barely start rich to lean in like 3 minutes.
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Old 12-04-2014, 12:40 AM
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Originally Posted by merdith6 View Post
I remember tunning one of those and that is one of the reasons I hated it. I don't mean to discourage you from trying other plugs or anything else but If I remember right it's just a pain in the butt engine that goes from barely start rich to lean in like 3 minutes.
I agree.

This does seem to be a really crappy engine.

I'm mostly just using it for experiments and learning from it.

I put a new Nova Rossi carb and shimmed the head for 30%. That seemed to correct a lot of issues. It was have other problems.

The new carb is very tunable but the rotating assembly seems to need something more to get the temps right. That's why I came on here about the plug.

I havn't done much with plugs so this is kinda new experience too.
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Old 12-04-2014, 02:28 PM
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Originally Posted by merdith6 View Post
I remember tunning one of those and that is one of the reasons I hated it. I don't mean to discourage you from trying other plugs or anything else but If I remember right it's just a pain in the butt engine that goes from barely start rich to lean in like 3 minutes.
Quite clearly you do not know how to distinguish a worn engine or how to tune an engine...you choose!
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Old 12-05-2014, 11:25 PM
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Originally Posted by Anf View Post
Quite clearly you do not know how to distinguish a worn engine or how to tune an engine...you choose!
I just remember coming across several of those engines back in the day they came in hyper OFNA cars I think. Not one ran good. Could have been worn out but every one of them, Possibly. As far as tuning I have been helping racers tune .21 buggy engines for about 15 years. I started out with inexpensive force 4 and 6 port Taiwan engines about 20 years ago and they ran without issues for a long time. The hyper engines just had terrible carbs and lost compression quickly in my opinion. I always recommended they get another engine. It ran crappy. end of story.
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Old 12-06-2014, 09:14 AM
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Originally Posted by merdith6 View Post
I just remember coming across several of those engines back in the day they came in hyper OFNA cars I think. Not one ran good. Could have been worn out but every one of them, Possibly. As far as tuning I have been helping racers tune .21 buggy engines for about 15 years. I started out with inexpensive force 4 and 6 port Taiwan engines about 20 years ago and they ran without issues for a long time. The hyper engines just had terrible carbs and lost compression quickly in my opinion. I always recommended they get another engine. It ran crappy. end of story.
I may not agree with Mr. Roach on too much but i do know he can tune a nitro engine , he knows a few things
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Old 12-06-2014, 11:09 AM
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The OS 20E carb works great in the Hyper 21 Pro engine.. the OS plugs are a little too short for that engine.. many years ago I used to run RB plugs in the Hyper Pro engine and it was crazy fast., the low end power wasn't the best but, it got the job done..
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Old 12-08-2014, 12:01 AM
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Originally Posted by D8 View Post
The OS 20E carb works great in the Hyper 21 Pro engine.. the OS plugs are a little too short for that engine.. many years ago I used to run RB plugs in the Hyper Pro engine and it was crazy fast., the low end power wasn't the best but, it got the job done..
Which RB plug?
I found these:
http://www.amain.com/rb-products-hot...plug-5-1/p4744

http://www.amain.com/rb-products-ver...plug-4-1/p4743

And thereís this LRP that looks like it might be good:

http://www.amain.com/lrp-platinum-ir...um-hot/p272990

The Duratrax Carbons Iíve been using are short too. Iím wondering if thatís been part of the problem.
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