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Old 10-04-2009, 05:53 PM   #1
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Default Sts .21 engine

Anyone ever any luck with these engines. I got one that likes to eat glowplugs. Just wanting some input on why it might be doing this. Thanks.
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Old 10-04-2009, 06:01 PM   #2
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Anyone ever ant luck with these engines. I got one that likes to eat glowplugs. Just wanting some input. Thanks.
mine is STS 21E model which look fine for me. The plug can last me atleast half gallon...I feel is your tuning problem....Try retune and see
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Old 10-04-2009, 06:05 PM   #3
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The things is it will run fine and then next time I go to start it when I remove the glow starter it will dye everytime. If I put in a new plug it solves problem for a while.
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Old 10-04-2009, 06:06 PM   #4
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The things is it will run fine and then next time I go to start it when I remove the glow starter it will dye everytime. If I put in a new plug it solves problem for a while.
Try increase the idle a little. Or warm up the engine and see it die or not....
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Old 10-04-2009, 06:10 PM   #5
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I run a D21E - break in was tough as these motors are really tight. I run a JP-3 pipe on mine and really enjoying it. What model are you running, what are your needle settings, and are you running a turbo plug or standard plug (With the brass washer)? How many gallons, what temps, does it run fine and then die or blow the plug. I'm sure we can help, just need more information.

IMHO - these are great engines.
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Old 10-04-2009, 06:19 PM   #6
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how do you shut down the motor?
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Old 10-04-2009, 06:20 PM   #7
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One, they aren't the greatest motors in the world. Flame away all you STS fans but it's the truth.

Two, blowing plugs usually means too much compression or worn parts. If the motor used to be fine but just now started blowing plugs after a fair amount of use, it probably needs a rod and maybe bearings as well. If it's new and always done it, add a head shim or run less nitro.
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Old 10-04-2009, 06:25 PM   #8
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Originally Posted by offr0aden View Post
I run a D21E - break in was tough as these motors are really tight. I run a JP-3 pipe on mine and really enjoying it. What model are you running, what are your needle settings, and are you running a turbo plug or standard plug (With the brass washer)? How many gallons, what temps, does it run fine and then die or blow the plug. I'm sure we can help, just need more information.

IMHO - these are great engines.
I run a turbo plug try to keep it around 200 to 215 and only has a gallon on it. It will run fine for a while and just blow the plug.
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Old 10-04-2009, 06:37 PM   #9
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What is your head shimmed to? What nitro content are you running? That engine comes with a standard head button. So someone has changed it, and could have removed the shims. You should have 3 on there I have to check the thicknesses. It sounds like you have too much compression and or a stretched rod. First place, I would check is the head shims, take them off, clean them and mic them so you know how much clearance you have / or don't have

I'm shimmed for 30 but run Byrons 25 - good stuff and has plenty of power.
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Old 10-05-2009, 03:38 AM   #10
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I am on my second d21e. the first one lasted 6 1/2 gallons without changing anything in it (bearings conrod etc). being a 3 port i generally run these at a warmer temp (225-250). break in isnt the most fun with these but once you get past the 1/2 gallon mark they run like a scalded ape and do so without tuning difficulty. plugs last about a gallon with me.


oh i bounce between 20% and 30% nitro juice depending on if it is for club racing or a larger event. these engines also like the 053 pipe
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Old 10-05-2009, 06:22 AM   #11
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My engine is the s21t model.
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Old 10-05-2009, 01:39 PM   #12
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I tried it after heating it with a heat gun and it does fine. Thanks for all the help.
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