I'm writing for an owner of a new-to-the-area-KR2. He has a Hapi 1835 on
his relatively plans-built KR2. Static engine runs are showing only 2400
RPM with a Props Inc. 54 x 47 prop. I'm thinking it is over-pitched.
So far Fred has:
* done a compression check and found all in the mid 70's
*
John, Netters & Fred:
Sounds to me like the engine is sick...Mid 70's compression is too low. Either
you have some rings that are not seated, valves too tight or you may have some
burned or unseated valves or valve seats.
A compression test is good, a leak-down test is always better. Do a leak-
Scott Cable wrote:
> Sounds to me like the engine is sick...Mid 70's compression is too low.
Either you have some rings that are not seated, valves too tight or you may
have some burned or unseated valves or valve seats.
I feel pretty sure that what he's talking about IS a leakdown test, in which
had
the same problrem with the Props INC prop.
>From: "John Bouyea"
>Reply-To: KRnet
>To: "KRNet"
>Subject: KR> Low Static RPM
>Date: Wed, 11 Aug 2004 07:21:34 -0700
>
>I'm writing for an owner of a new-to-the-area-KR2. He has a Hapi 1835 o
A tach check is a necessary first step especially if the aircraft is new to
the owner. A question to also ask is how does the KR perform.What is
the dynamic RPM? How much take off run, how many FPM in climb. Can he
carry a passenger and if so how many FPM. I ran a Sturba 54X52 on my 1910
ty
Scott, Mark, Stanley, Orma, Colin, and all,
* The compression test was a leak-down.
* He compared his with an identical prop from Props Inc with the same
results so his is being re-pitched flatter
* I don't know about a tach check and that sounds like a good test item.
* He is getting 135 - 1
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