RCU Forums - Timing question

RCU Forums (https://www.rcuniverse.com/forum/)

- Gas Engines (https://www.rcuniverse.com/forum/gas-engines-142/)

- - Timing question (https://www.rcuniverse.com/forum/gas-engines-142/11087976-timing-question.html)

rem0.061

05-20-2012 02:04 PM

Timing question

How do I know when I have the HALL switch in the right spot for maximum performance?

BadAzzMaxx

05-20-2012 02:13 PM

RE: Timing question

Here are two different ways it can be done.

http://www.rcextremepower.net/ignition_timing.html

http://www.youtube.com/watch?v=GBXFpxWg7vY

Milton

The Ghost

05-20-2012 02:15 PM

RE: Timing question

Most engines run it at 28deg BTDC. You will need a degree wheel and check and reset if reguired. Won't let me upload the PDF. Can be found at http://www.dlenginesaustralia.com/dl...iewDoc&docId=9 half way down under Ign Systems- Ing Installation

Cheers

rem0.061

05-20-2012 02:37 PM

RE: Timing question

Thanks, I'll try 28 degrees. I'm converting a super tigre 90 into a gas engine, any tips for that?

w8ye	05-20-2012 03:25 PM

RE: Timing question

16:1 oil

rem0.061

05-20-2012 03:47 PM

RE: Timing question

How about estimated output; better or worse, faster or slower.

av8tor1977

05-20-2012 03:57 PM

RE: Timing question

Mine turns a Zoar 14 x 6 at 10,600 rpms. About 12.5 lbs static thrust. It was converted to roller bearings for me by Keith at BME and I run it on 20:1 oil. (Actually I got those numbers after only one tank of fuel through it. It might be turning a little more now.)

BME offers them converted, as well as www.lambertsrc.com

AV8TOR

rem0.061

05-20-2012 04:03 PM

RE: Timing question

I have a feeling mine might do 11,000 rpm on a 15x4 currently as a glow engine, but the carb has to be retuned after a while of sitting. I think that a spark conversion will help. At least there wont be as much oil mess.

w8ye	05-20-2012 05:49 PM

RE: Timing question

14 X 6 was my magic prop at 10,500 rpm

rem0.061

05-21-2012 02:19 AM

RE: Timing question

It is on a Prox 260 and the 15x4 almost flew it too fast.

AA5BY

05-22-2012 02:58 AM

RE: Timing question

Quote:

ORIGINAL: w8ye

16:1 oil

Your answer raises a question. There is a notable performance loss between a 40:1 and 32:1 so how much more loss at 16:1?

rem0.061

05-22-2012 03:30 AM

RE: Timing question

Well, the engine already runs on a lot of oil because it is a small nitro engine.

w8ye	05-22-2012 03:32 AM

RE: Timing question

If you do not run 16:1, the rod will wear out.

With dino oils like Pennzoil, the loss at 16:1 is not significant.

rem0.061

05-22-2012 03:33 AM

RE: Timing question

Just out of curiosity how fast of rpm can most ignition systems keep up with? Can they handle 20,000rpm?

w8ye	05-22-2012 04:34 AM

RE: Timing question

20,000 is about it for the ones we use

clivemc

05-22-2012 10:06 AM

RE: Timing question

Quote:

ORIGINAL: AA5BY

Quote:

ORIGINAL: w8ye

16:1 oil

Your answer raises a question. There is a notable performance loss between a 40:1 and 32:1 so how much more loss at 16:1?

performance loss between 32:1 and 40:1 ????????? maybe you just needed to retune it. there is no power loss at these sorts of oil ratios in fact it can even be argued you will gain power...... search for gordon jennings moreis less less is more etc etc article. I have tested from 30:1 to 50:1 ratios and ended up now on always running 35:1 from run -in and always..... its a very debatable topic, but power loss is not a good argument...

ec121

05-22-2012 10:47 AM

RE: Timing question

Any oil ratio change is a mixture change. The needles would have to be touched up.

av8tor1977

05-22-2012 11:15 AM

RE: Timing question

Quote:

ORIGINAL: clivemc

Quote:

ORIGINAL: AA5BY

Quote:

ORIGINAL: w8ye

16:1 oil

Your answer raises a question. There is a notable performance loss between a 40:1 and 32:1 so how much more loss at 16:1?

performance loss between 32:1 and 40:1 ????????? maybe you just needed to retune it. there is no power loss at these sorts of oil ratios in fact it can even be argued you will gain power...... search for gordon jennings more is less less is more etc etc article. I have tested from 30:1 to 50:1 ratios and ended up now on always running 35:1 from run -in and always..... its a very debatable topic, but power loss is not a good argument...

Yep, I totally agree.

AV8TOR

All times are GMT -8. The time now is 03:06 PM.