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morid(at)northland.lib.mi
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 Posted: Sat Jul 29, 2006 5:59 am Post subject: Setting prop revs NSI |
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Hi all. Just home from Oshkosh. Actually it's AirVenture, but I've had a difficult time changing old habits.
The numbers given below by Graeme are indeed correct. I spoke with Lance at length about this a few years ago and he explained that the engine is pretty much a racing engine the way it's built up and the rings need this high rpm periodically. I've found with mine over a 325 hour period that I get my best takeoff thrust about 5400 rpm and cruise torque at right around 3900 rpm using the NSI CAP prop. Lance said these numbers are fine for normal use, but to run it up to 6200 periodically to keep the top end clean. Soobs are high rpm engines anyway, so I wouldn't worry much about it.
I have a Cadillac Seville with Northstar engine and one of the factory recommendations is to periodically put the tranny in 3rd then from 40mph plant the throttle to the floor until it reaches 6000 rpm (about 87mph) then let off on it until the speed reaches 40 again. Northstars are also high performance engines that are mostly run at very low rpms and are prone to build carbon on the compression rings if not given a good thrashing occasionally.
Hope this helps.
Deke
Time: 03:02:09 AM PST US
From: "QSS" <msm(at)byterocky.net (msm(at)byterocky.net)>
Subject: Re: Setting prop to revs
John, its the NSI 108 HP model. I think they are tweeked up a bit
because the standard EA 81 is much lower in HP than that. Im going to go
with your figures when Im back in Yeppoon and see how it goes. I'll let
you know the results.
Cheers
Graeme ----- Original Message -----
From: John Anderson
To: kitfox-list(at)matronics.com (kitfox-list(at)matronics.com)
Sent: Monday, July 24, 2006 7:15 PM
Subject: Re: Setting prop to revs
--> Kitfox-List message posted by: "John Anderson"
Yes, they certainly seem high to me me Graeme....I have a friend with
a normally asperated EA81 and limits 5500 max for t/o. Goes very well,
he has upped the comp ratio a little and bigger carb. You can always set
the prop to give you more RPM for that one-of if your underpowered a bit
but will cost on cruise. But that little engine sure is going to last
longer at lower RPM. Is it a std EA81 or have you tweeked it a little? I
limit to 5000 for t/o but rearly need it and 4000 for cruise but then
I'm turbo'd. John
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Hi John, thanks for the advice. I've been following the threads
going back and forth between yourself and others with your own plane and
being at the same point myself with engine info requirements Im really
close to flying. The problem I have is that I was sent an NSI data sheet
on engine performance and in it the advice was that take off engine revs
should be around 6200. I shook my head in disbelieve at these figures
and asked a mate who overhauled my engine what he thought and he agreed
that the figures were high. I was wondering if the figures quoted are
for the NSI engine with the CAP system. I dont know if that would make
any difference or not but 6200 seem very high and more a kin to the 2
stroke rev range than a four stroke. Figures quoted in the NSI EA 81
OPERATING LIMITS are as follows.
Idle RPM 1350-1400
Cruise RPM 3200-4500
Take off RPM 6200
Max Continuous RPM 5800
Never exceed RPM 6500
Regards
Graeme
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Graeme Toft
Joined: 09 Jan 2006
Posts: 123
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| Posted: Sat Jul 29, 2006 3:13 pm Post subject: Setting prop revs NSI |
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Thanks for the confirmation Deke, I'm going to fly her today and will set the revs to the specs provided on the performance sheet. I'll get the photo's to you soon also. Just back from being away.
Regards
Graeme
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