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Old 09-10-2019, 05:51 AM
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Quote:
Originally Posted by Harold Smith View Post
Wonder why they went away from being able to just rock the crankshaft to get a spark.--Smitty
I always heard it was a safety thing....so just a bump like by accident or a child couldn't cause the engine to fire up
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Old 09-10-2019, 12:17 PM
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It's a truly worth while safety feature. The DA ignitions require a 250 RPM speed to fire the ignition.


Rocking the prop. with ignitions that don't require a certain RPM to fire is a very dangerous thing to do. I regret to say, I have seen this result in disaster.
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Old 09-10-2019, 02:27 PM
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Thanks for the replies back. I think I'll pass on the tongue method.
I'm going to give it a try now. If I see a spark, I'll reconnect the plug and see if I can start the engine. I just recently installed a new DLE 30 Walbro carb that hasn't been tried yet also.

Lamar
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Old 09-10-2019, 02:32 PM
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>>> I think I'll pass on the tongue method.<<<


make video if you change your mind
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Old 09-10-2019, 04:05 PM
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It's a bug sold as a feature. A hall effect sensor used by most is either open or closed as the magnet passes and speed makes no difference. A da setup senses a/c voltage from the magnet/coil design and requires a bit of speed to generate the signal and fires either on a rising or lowering voltage swing. This difference in operation has been sold as a feature. Hall effect is more precise but both work fine.
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Old 09-10-2019, 07:24 PM
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I confirmed that my plug has a spark when I flip the prop. I reinstalled the plug, fueled up, choked the carb and tried flipping the prop. I can't seem to draw any fuel from the tank to the carb. With the tank full, I pumped fuel through the vent line to see if I could get fuel pushed to the carb. The gas could be seen in the line getting to the carb inlet, but when I would flip the prop the fuel seems to just go back toward the fuel tank. I don't have an electric starter strong enough to use. Would an electric starter help with getting the fuel flow to the carb, or do I have a diaphragm or fuel line issue?

Lamar
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Old 09-10-2019, 09:31 PM
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Quote:
Originally Posted by KMatch View Post
It's a bug sold as a feature. A hall effect sensor used by most is either open or closed as the magnet passes and speed makes no difference. A da setup senses a/c voltage from the magnet/coil design and requires a bit of speed to generate the signal and fires either on a rising or lowering voltage swing. This difference in operation has been sold as a feature. Hall effect is more precise but both work fine.
Not true, the new RcExcel ignitions are programmed for the magnets speed of open and closed, hence requiring a faster flip to fire. And this is not just my opinion but rather told to me by Milton at RcExtreme power.
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Old 09-10-2019, 10:03 PM
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Originally Posted by acerc View Post
Not true, the new RcExcel ignitions are programmed for the magnets speed of open and closed, hence requiring a faster flip to fire. And this is not just my opinion but rather told to me by Milton at RcExtreme power.
Ace, what he is saying about the DA ignition is true and the spark at a higher cranking speed is a byproduct of the inductive pickup. Not so for hall effect sensors as there the spark triggering is controlled by the electronics as you point out here and in previous threads. I noted the same in post 13 above.
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Old 09-10-2019, 10:44 PM
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Originally Posted by lamarkeiko View Post
I confirmed that my plug has a spark when I flip the prop. I reinstalled the plug, fueled up, choked the carb and tried flipping the prop. I can't seem to draw any fuel from the tank to the carb. With the tank full, I pumped fuel through the vent line to see if I could get fuel pushed to the carb. The gas could be seen in the line getting to the carb inlet, but when I would flip the prop the fuel seems to just go back toward the fuel tank. I don't have an electric starter strong enough to use. Would an electric starter help with getting the fuel flow to the carb, or do I have a diaphragm or fuel line issue?

Lamar
Put a small squirt of gas directly in the carb inlet and try to start it. Sometimes the engine firing is enough to wake up a carb with sticky internal parts.
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Old 09-10-2019, 10:48 PM
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Double post
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Old 09-10-2019, 10:50 PM
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Originally Posted by acerc View Post
Not true, the new RcExcel ignitions are programmed for the magnets speed of open and closed, hence requiring a faster flip to fire. And this is not just my opinion but rather told to me by Milton at RcExtreme power.
Must be pretty damned new since none of mine I tested currently respond this way. Some just might but I didn't check them all. Let's not lose the word "most" I cleverly tossed in there just to prevent being called a liar due to enhanced technologies. Yes, some hall effects do respond to speed based on module designs. "Most" don't.
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Old 09-10-2019, 11:19 PM
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Originally Posted by KMatch View Post
Must be pretty damned new since none of mine I tested currently respond this way. Some just might but I didn't check them all. Let's not lose the word "most" I cleverly tossed in there just to prevent being called a liar due to enhanced technologies. Yes, some hall effects do respond to speed based on module designs. "Most" don't.
I first ran into the RCexl modules that required a bit cranking speed in about 2015 or so. Prior to that they all sparked immediately as the magnet passed the sensor. No big deal but it makes timing more difficult. I just use a sensor tester when timing.
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Old 09-11-2019, 02:39 AM
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I said it before, loosen the big screw on the carb, put some pressure into the tank until fuel comes out of the plate were you loosen the screw, tighten the screw and the engine will start. Don't know how many times someone needs to tell you how to fix the problem.---Smitty
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Old 09-11-2019, 05:43 PM
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Originally Posted by Harold Smith View Post
I said it before, loosen the big screw on the carb, put some pressure into the tank until fuel comes out of the plate were you loosen the screw, tighten the screw and the engine will start. Don't know how many times someone needs to tell you how to fix the problem.---Smitty
Smitty, I did exactly as you said. After I loosened the screw on the plate, I pumped fuel into the tank until it started leaking out the plate. I retightened the plate screw, turned on power, flipped the prop, and the engine fired up the first time. Your my hero. Thanks for the help.
Sorry I missed your first post. I think I thought you were addressing it to someone else.

Lamar
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Old 09-12-2019, 06:02 AM
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Glad it worked for you. Believe me I chased that same problem on a DLE-61 new right out of the box. ---Smitty
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