[NSRCA-discussion] Mintor 1.70 Question

[Gray E Fowler]

Tim

Are you sure that the pump is functioning? The backfire is a sign of lean 
mid and will damage the CF pipe baffles. During the hot summer, the pump 
can get very hot. Do you have the pump insulator modification on your 
engine? Mintor designed this at Lance's request, as the Texans discovered 
this problem flying in 100F+ temps that exceed European climates.



Gray Fowler
Senior Principal Chemical Engineer
Radome and Composites Engineering
Raytheon



"Pascoe,Tim [Burlington]" <Tim.Pascoe at ec.gc.ca> 
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08/03/2006 09:01 AM
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[NSRCA-discussion] Mintor 1.70 Question






Hey List,
        I’ve been setting up a Mintor 1.70 in a new plane, and am running 
into some minor difficulties. I first started running the engine last 
fall, and has some mechanical trouble which lead to some major needle 
twisting. After getting the mechanical trouble out of the way, I’ve found 
myself trying to get the pump/needles back to where they should be, with 
varying levels of success.
        The original symptoms seemed to indicate a lean mid-range on the 
engine; dying on throttle up after a down line, the odd backfire when 
spooling up from idle in the flat. I’ve been constantly richening the pump 
in an attempt to solve these issues, and it seemed to work at first. 
Better mid-range, no dead sticks. However, I am still getting the odd 
backfire, and I’m really afraid that I’m going to start busting stuff. I 
am now well in on the pump screw, much further than another Mintor 1.70 
flier running the same fuel, and a long way past flush with the screw 
housing. The mid-range needle is also on the rich side of the setting.
        Any suggestions would be appreciated. The lines have all been 
checked, and they are fine (pretty much new anyway). The tank clunk is 
free, and the vent line is clear. Is it possible the backfire issue is in 
fact a too rich mixture, and I’m chasing the problem the wrong way?
        It’s getting frustrating, as the engine is great in many other 
ways – very easy to start, phenomenal power, good throttle response. I’m 
running a 17x13 prop (soon to switch to the new 18.1x10) on an Aeroslave 
carbon pipe set approx ¼ to ½ inch longer than the Aeroslave recommended 
length, with Cool Power 15% for fuel.
Tim Pascoe_______________________________________________
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