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From: Lehanover@aol.com
Full-name: Lehanover
Message-ID: <9872d.3f46c61d.3f9c6952@aol.com>
Date: Fri, 25 Oct 2013 20:39:46 -0400 (EDT)
Subject: Re: [FlyRotary] Re: help starting engine
To: flyrotary@lancaironline.net
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That was a fresh rebuild or crate engine? I have forgotten already.
I have only seen show room stock racers use the stock ignition system  
systems because the rules require it. All others use either a Mallory Hifire CD  
system or an MSD multi-strike CD system. It is not uncommon to have 
difficulty  starting a fresh engine. The assembly lubes drain off or evaporate and 
good  sealing is lost before the first start attempt. Thus the squirting oil 
idea.  Also the street car being pushed after a rebuild is common. In 2nd 
gear fast  enough to spin the engine well past starter RPM so that leak times 
are so short  that high enough compression for a start is achieved. If you 
follow even the  factory suggested rebuild clearances, you can be 
disappointed. Maximum end gap  for side seal to corner seal is, .004" when anything 
over that is rebuild time.  I start with zero end clearance. That will 
increase as the rotor comes up to  temperature. So, there is no binding at all and 
a near perfect compression seal,  and instant starts. The CD systems offer 
the
additional help by lighting a mixture so lean as to be a lean cut-off for  
the stock system, and also light a massively over-rich mixture that would  
foul the plugs with the stock system. Even if only installed to start  
rebuilds in the shop the CD system is a good investment. Once the engine has run  
in for a number of hours, it will start instantly. 
 
Just as cylinder filling is affected by engine RPM. It is also affected by  
throttle position. In carbed engines we must keep the butterfly close by 
the  idle drillings in the carb body, lest there be little to no fuel 
atomization.  Poorly atomized fuel looks too lean to the engine and ignition (if 
any)  produces a very low power explosion. So starts are done with the 
butterfly close  to idle and an over rev on start up is unlikely. In injected 
engines any  amount of fuel per cycle may be selected, and a start may occur with 
the  throttle in the wide open position. It is a safety  must that a hand be 
on  the throttle ready to close to the idle position instantly on start up.
 
Lynn E. Hanover    
 
 
In a message dated 10/25/2013 7:38:13 P.M. Eastern Daylight Time,  
kjohnsondds@yahoo.com writes:

Thanks Lynn,
It would seem that the reason the spark plugs  fire every once in a while 
is because they are wet.  
Ken


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<DIV>That was a fresh rebuild or crate engine? I have forgotten already.</D=
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<DIV>I have only seen show room stock racers use the stock ignition system=
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systems because the rules require it. All others use either a Mallory Hifir=
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system or an MSD multi-strike CD system. It is not uncommon to have difficu=
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starting a fresh engine. The assembly lubes drain off or evaporate and good=
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sealing is lost before the first start attempt. Thus the squirting oil idea=
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Also the street car being pushed after a rebuild is common. In 2nd gear fas=
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enough to spin the engine well past starter RPM so that leak times are so s=
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that high enough compression for a start is achieved. If you follow even th=
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factory suggested rebuild clearances, you can be disappointed. Maximum end =
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for side seal to corner seal is, .004" when anything over that is rebuild t=
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I start with zero end clearance. That will increase as the rotor comes up t=
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temperature. So, there is no binding at all and a near perfect compression =
seal,=20
and instant starts. The CD systems offer the</DIV>
<DIV>additional help by lighting a mixture so lean as to be a lean cut-off =
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the stock system, and also light a massively&nbsp;over-rich mixture that wo=
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foul the plugs with the stock system.&nbsp;Even if only installed to start=
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rebuilds in the shop the CD system is a good investment. Once the engine ha=
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in for a number of hours, it will start instantly. </DIV>
<DIV>&nbsp;</DIV>
<DIV>Just as cylinder filling is affected by engine RPM. It is also affecte=
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throttle position. In carbed engines we must keep the butterfly close by th=
e=20
idle drillings in the carb body, lest there be little to no fuel atomizatio=
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Poorly atomized fuel looks too lean to the engine and ignition&nbsp;(if any=
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produces a very low power explosion. So starts are done with the butterfly =
close=20
to idle and an over rev on start up is unlikely. In injected engines&nbsp;a=
ny=20
amount of fuel per cycle may be selected, and a start may occur with the=20
throttle in the wide open position. It is a safety &nbsp;must that a hand b=
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the throttle ready to close to the idle position instantly on start up.</DI=
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<DIV>&nbsp;</DIV>
<DIV>Lynn E. Hanover&nbsp;&nbsp;&nbsp;&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>
<DIV>In a message dated 10/25/2013 7:38:13 P.M. Eastern Daylight Time,=20
kjohnsondds@yahoo.com writes:</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid">=
<FONT=20
  style=3D"BACKGROUND-COLOR: transparent" color=3D#000000 size=3D3=20
  face=3DHelvetica>Thanks Lynn,<BR>It would seem that the reason the spark =
plugs=20
  fire every once in a while is because they are wet.=20
<BR>Ken<BR></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>
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