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bw12345(at)sbcglobal.net
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 Posted: Fri Feb 12, 2010 10:07 am Post subject: 2200 timing |
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I have been going through the Maintenance CD trying to find out how to check timing. It mentioned 23 degrees BTDC on number one on assembly. Said to align timing marks. Is this engine static timed only?Would someone please elaborate on this procedure.
I do not get full rpm's and have a high egt. Would like to check timing and rule out that it is not retarded,which would cause both these conditions.
BOB
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Fri Feb 12, 2010 12:32 pm Post subject: Re: 2200 timing |
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Bob,
The mags are statically timed. Unlike the Rotax, they have no low rpm retard. Only adjustment is for magnet gap.
High EGT sugggests you have lean mixture at full throttle. Make sure the float vent tube is connected to the air box and the carb is behaving correctly or look for head seal leaks or induction pipe leaks.
Most of this is covered in Jaba Chat newsletter on the website.
Ralph
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Ralph - CH701 / 2200a |
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Peter H
Joined: 20 Mar 2007
Posts: 197
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| Posted: Fri Feb 12, 2010 1:32 pm Post subject: 2200 timing |
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Bob the ignition timing is fixed by the position of the magnetos. There is no adjustment unless you reposition the magnetos.
Full RPM will depend on the prop that you use. High egt is caused if the mixture is too lean and is unrelated to timing.
Peter
From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of Robert Rivard
Sent: Saturday, 13 February 2010 4:05 AM
To: jabiruengine-list(at)matronics.com
Subject: 2200 timing
I have been going through the Maintenance CD trying to find out how to check timing. It mentioned 23 degrees BTDC on number one on assembly. Said to align timing marks. Is this engine static timed only?Would someone please elaborate on this procedure.
I do not get full rpm's and have a high egt. Would like to check timing and rule out that it is not retarded,which would cause both these conditions.
BOB
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xair899
Joined: 31 Jan 2010
Posts: 2
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| Posted: Sun Feb 14, 2010 12:06 pm Post subject: Re: 2200 timing |
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A simple check for ignition timing which isn't precise but will show gross errors. Can't claim credit for it, thank Roger Lewis.
Remove a spark plug from no 1 cylinder and place a finger over the hole, rotate the prop slowly in the correct sense. When you feel compression you are near TDC for the firing stroke. Gently put a thin screwdriver in the spark plug hole to feel when the piston reaches TDC. It will take a few goes as there is a dead space at the peak. If you have a dial gauge you can use the method in the manual.
On the flywheel the two magnet centers will be at the 9:30 and 3:30 clock positions. Mark a tooth against some reference point, then rotate the prop slowly backwards and count the number of flywheel teeth required to center of the magnets exactly on the coils.
The flywheel has 101 teeth (99 on older engines), so 1 tooth is roughly 3.6 degrees. 25 degrees / 3.6 = just under 7 teeth.
Nick
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