Engine tuning...again.

[andys]

Going to try setting my newish engine up again when the rain stops.. Just want to be sure I've got this tuning stuff right in my head as I've forgotten what I did last year ! I ran the engine in and ran it at one meeting before the weather went bad, seemed to run ok by the end of the day, but bogged down occasionally on acceleration.

Is this right.... From all the crap I've watched on you tube

Set low speed with pitch test so it runs for 3 seconds, picks up and cuts out...
If it doesn't accelerate nicely on the box, look to lean the LSN.
If the LSN is too rich, it might cut out after starting it (any other obvious signs of rich / lean on LSN ? )

Run the car to set the HSN, if it doesn't reach full speed it needs leaning. Keep leaning it till theres no increase in performance, then just richen it up a tad, should be good smoke on full throttle.

Have I missed anything key, or indeed got it right !
Cheers.

[jimmy]

You coming to ndor with me and Stu tomorrow chief?

[Chaz]

No need to do a pinch test, to be honest thats a load of bollocks and to many variables from where you pinch the line.

Get the engine up to temp on the box with light blips n full throttle. Once its at temp give it full throttle a couple of times. If it smokes loads lean the LSN . You'll know if you go to far by leaning it because the engine will stutter the accelerate. Then set the idle. Dont listen to the yanks going on about idle gap, every engine is different and must be set accordingly with the tuning of the LSN. If you lean the LSN you should turn out (richen) the idle. Generally little tweaks here and there on the LSN wont really effect the idle. Im not sure what engine you run but i know on the Reedy's you'd set the idle so as soon as your off the gas it doesn't hang at a 'high idle' it just goes straight down. Thats pretty much the same with a OS. Ofcourse if the HSN is way rich it'll mess about with the LSN but setting that is fairly easy. A way i used to do it was lean it and hold it at full throttle for 2secs. If it was lean it would wanna shut down. So you just richen it until it just wants to carry on. The way you talk about tuning the HSN is good though and you can't go wrong with it.

[andys]

Originally Posted by jimmy

You coming to ndor with me and Stu tomorrow chief?

Jim, if I knew where ndor is, and I'd known it was on, then I'd have been there ! Let me know the next meet your going to

Chaz. Cheers for the info.

[chalky]

what engine is it?

[andys]

Hi Chalky.

It's a TechnoPower B01-21. Ran it at the last meeting and was pleased with it although I'm sure it's far from set right as I was struggling to get it initially up to speed, and then once I'd leaned out the HSN a lot, it bogged down a bit on acceleration a few times.

[carlin]

You may have the HSN to lean (still needs bedding in) need to richen up little, work the bottom end sounds of it tbh.