Glow Engines Discuss RC glow engines

Losi 454 tuning blues....

Old 06-06-2019, 06:12 PM
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Default Losi 454 tuning blues....

So I recently purchased a used Losi 8ight T 2.0 RTR off of eBay. The thing is in great shape & appears to have been lightly used. I stared out in this hobby with nitro about 11 yrs ago & thought I had a relatively good knowledge of these, but this thing has been a nightmare. Iíve tightened everything up, checked for air leaks, zip tied fuel tubing, reset all needles to the factory 2.5 turns, tried a variety of plugs, compression seems good & for the life of me I canít get this thing to run or tune for ****. In the even I do get it running. It gets hot way quicker than my other engines (Losi 427) . Itís blowing gobs of smoke yet it idles really high. You blip the throttle & it dies. Ivd leaned it, richened it, the one time I actually got it to drive, it would sputter (like a wookie lol) badly. Iím at a loss. Any advice would be greatly appreciated.
Old 06-06-2019, 06:42 PM
the Wasp
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well if nothing happens when you tune the needles I would take the carb off and pull the needles out and clean it well, make sure the O-Rings on the needles are good,
you say it's smokes a lot, so I don't think it's an air leak, yet you could make sure the engine is sealed well, hummmm, maybe there is no Head Shim on it so it has to much compression ?? when glow engines have to much compression for the fuel that is being used they don't tune well at higher RPMs.

maybe the exahust is plugged ???


Last edited by the Wasp; 06-06-2019 at 06:47 PM.
Old 06-07-2019, 02:26 PM
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Wrong idle gap and consequently improper needle settings. Set idle gap to 0.5-0.7mm, both needles flush with their housings and re-tune from there. Get it to idle reliably without quitting by keeping glow plug heated and lean the low speed needle until it will idle. Then set the high speed and go back to the low side to get a clean transition from idle to WOT. The engine should run 240-270F when tuned properly using a MEDIUM heat plug and 20-25% nitro. DONT use a hot glow plug!! Adjust the needles in SMALL increments.
Old 07-22-2019, 09:42 PM
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So as it turns out this engine has a VERY small tuning window. Itís unlike any other engine Iíve owned. At any rate, I fount the sweet spot & it runs like a ****. Thanx for the input!

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