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Ignition on Glow engines - 4/29/2008 1:58:13 AM   
Campgems


 

Posts: 1642
Joined: 2/18/2006
From: Arroyo Grande, CA, USA
Status: offline 		One of our guy was out to the field Sat with his 1/4 scale Yak. He had been working on it and the cowl was off. There sat an O.S. 300 twin, with spark ignition. I was looking at it and it had the stock carb. I was asking how it was running with that carb, think he was using Gas. Nope Iginition on Glow fuel. He said it ran great, better than on Glow. Now, he has me wondering if this is somehing I should try. Any of you guys have any experience with spark iginition on glow fuel?

Don
       Post #: 1

RE: Ignition on Glow engines - 4/29/2008 2:09:10 AM   
w8ye



Posts: 17021
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: offline 		I've seen two different OS 91 Surpass I engines running with C-H spark ignition and Glow fuel. It works great when you want to do a lot of slow running with reliability.

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RE: Ignition on Glow engines - 4/29/2008 2:37:18 AM   
Campgems


 

Posts: 1642
Joined: 2/18/2006
From: Arroyo Grande, CA, USA
Status: offline 		I wondered if it would be a good cure for inverted engines loading up at idle and stalling. Hummmm I've got an ignigion setup. I've got a Mag 91 that I've got to replace bearings in after it's last veritcal landing. May be fun.

Hey, I just ordered a Phonix Funstar to get me back in the air after wiping out my 4*60 Saturday. I believe it is setup for an inverted engine. I may try it on my Mag 52. Now to do some studying.

Don

(in reply to w8ye)
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RE: Ignition on Glow engines - 4/29/2008 4:12:04 AM   
w8ye



Posts: 17021
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: offline 		Ignition on an inverted engine should be the cat's meow.

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Original AMA #31261

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RE: Ignition on Glow engines - 4/29/2008 9:59:19 AM   
Patxipt


 

Posts: 225
Joined: 10/13/2006
From: lx, PORTUGAL
Status: offline 		I have used a fixed timing ignition on my ASP FS52. When set with retard, it idled with the carb barrel virtually closed at 1700rpm. With advanced timing, it ran beautifully as on glow. The engine also ran smoother and exhaust note was softer.
I'm having a CH ignition coming up on the mail for a permanent setup on this baby.

< Message edited by Patxipt -- 4/29/2008 10:04:33 AM >

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RE: Ignition on Glow engines - 4/29/2008 11:25:52 AM   
w8ye



Posts: 17021
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: offline 		In case any of you are thinking too much . . . . The four strokes only fire every other time the piston reaches top dead center so how do you pick up the proper timing pulse?

No problem, just use the crankshaft and the ignition fires every time the piston comes up but the is no combustion on the odd stroke because both valves are open and there is no compression or proper fuel air mixture.

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RE: Ignition on Glow engines - 4/29/2008 12:32:48 PM   
Hobbsy



Posts: 10426
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		Jim, here is how I did it on the Saito 2.20, it has a wasted spark on the exhaust stroke, nearly all older (paralell) twin MC engines sparked both cylinders at the same time. That way it just required one coil with two output leads.

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RE: Ignition on Glow engines - 4/29/2008 5:08:00 PM   
Campgems


 

Posts: 1642
Joined: 2/18/2006
From: Arroyo Grande, CA, USA
Status: offline 		How do you advance the spark?

THe guy at our field that started this all has a mechanical advance off the thottle linkage. The Pickup is mounted in a ring that rotates around the nose bearing housing. I sure wish I had taken photos and I even had my camera there. I've got everything I need in hand other that a pickup mount for the engine. I'll have to look over the instructions with it again.

Does this sound like a reasonable approach for tuning? Use a glow plug and tune the engine as normaly done. The replae the glow with spark and setup the timing of the spark. I'm guessing that the carb is going to require some additional adjusting at this point.

Don

(in reply to Hobbsy)
       Post #: 8

RE: Ignition on Glow engines - 4/29/2008 6:26:09 PM   
Jezmo



Posts: 749
Joined: 6/26/2006
From: Spring, TX, USA
Status: offline 		With the CH units the advance/retard is built into the box. You set the initial timing at say 28 deg. and it automatically (electronically) retards the timing at idle to about 4 deg. give or take a few.

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RE: Ignition on Glow engines - 4/29/2008 7:13:11 PM   
w8ye



Posts: 17021
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: offline 		The C-H ignition systems whether they are the fixed (mechanical timing) version or the synchro spark (electronically variable version) are trouble free. They run on 4.8V and you can use a battery-switch-charging setup with them much like you do for your airplane radio.

Once you get the timing within reason, tuning, either timing or mixture, is just straight forward.

< Message edited by w8ye -- 4/29/2008 7:14:23 PM >

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RE: Ignition on Glow engines - 4/29/2008 8:05:43 PM   
Jezmo



Posts: 749
Joined: 6/26/2006
From: Spring, TX, USA
Status: offline
quote:

ORIGINAL: w8ye

The C-H ignition systems whether they are the fixed (mechanical timing) version or the synchro spark (electronically variable version) are trouble free. They run on 4.8V and you can use a battery-switch-charging setup with them much like you do for your airplane radio.

Once you get the timing within reason, tuning, either timing or mixture, is just straight forward.


Well said Jim. I agree, mine have been very reliable and user friendly plus you can't beat the service Bill and Company give.

< Message edited by Jezmo -- 4/29/2008 8:06:11 PM >

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RE: Ignition on Glow engines - 4/29/2008 10:18:18 PM   
rlmcnii


 

Posts: 399
Joined: 7/3/2005
From: Pocomoke City, MD, USA
Status: offline 		Those with Experience,

Would a Saito 3.00 twin run more smoothly on spark ignition than it will run with on-board glow power? Assume glow fuel in both situations.

The engine will be run in a 1/3 scale Spacewalker.

Thanks.



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RE: Ignition on Glow engines - 4/29/2008 10:29:40 PM   
Dsegal


 

Posts: 1724
Joined: 10/20/2002
From: Philadelphia, PA, USA
Status: offline 		The December. 1997 issue of RCM has an article on running spark ignition on 4-stroke glow engines. Biggest gain was using fuel without nitro.

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RE: Ignition on Glow engines - 4/30/2008 12:36:36 AM   
w8ye



Posts: 17021
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: offline 		Well, I have seen one of the ignition OS 91's quit on the guy for some reason or another. He was running it mighty slow and it didn't sound as though the mixture was as good as it could be. I didn't meddle into his business. I had my own plane to worry about.

The ignition would most likely help a 300 a little. I think TKG at C-H has a model with a double ended coil?

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RE: Ignition on Glow engines - 4/30/2008 6:37:46 AM   
Ray Wasson


 

Posts: 36
Joined: 3/15/2002
From: OR
Status: offline 		I have been running a ST 2300 with an OS 7D carb. & 15% Coolpower several years on 140 size IMAC planes. I use a Cline regulator and a home maid fuel pump cut from a Walbro carb. It had a Bison Pits style muffler. It turned an APC 18-6W 8700 rpm % idled as low as 1600 rpm. I normally set to 1800 and would idle a tank full out without loading & instant throttle response. The minus was if cruised in the 4 to 5K rpm for over 30 seconds or so the glow plug would go out with out warning as the engine ran smooth until flame out. An on-board glow driver solved t