Today's Message Index:
----------------------
1. 09:10 AM - SI 8 (AirEupora)
2. 10:33 AM - Re: SI 8 (FLYaDIVE)
3. 06:46 PM - Re: SI 8 (kayberg@aol.com)
4. 08:41 PM - Re: SI 8 (Keith Pickford)
Message 1
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I have been talking off line with one of our members and he brought up the subject
of the hollow push rods. I pulled the SI 8 and read through it and call my
dealer. It would cost me about 1K to install the hollow pushrods and lifters,
plus it would put me down for a while. I'm not sure of the benefit. Lycoming
and Cont has been doing it that way for fifty-sixty years. It make sense
to use the oil to take away the heat from the heads.
Has anybody installed the hollow push rods.
I'm just coming up to five hours on my engine and still battling the heating problem.
I'm a 1/2" from the ends of the runway and have to shut the engine off
at the ends as the temp come up to 302 by the time I get there and the oil temp
are below 104.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=383523#383523
Attachments:
http://forums.matronics.com//files/sl8_rev1_201011_109.pdf
Message 2
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Lycoming uses hollow push rods for a couple of reasons:
1 - Cheaper to manufacture
2 - Lighter in weight
3 - They do not have to do a Chem/Phys on the material
4 - They do not have to anneal the material for machining and then harden
it after machining
5 - The ends of the push rods can be tumble polished
6 - Easier to make matching lengths
But - HEAT TRANSFER was never a consideration because the contact surfaces
for heat transfer are too small to make a difference. And - Once the OIL
has reached operation temp the push rods have become heat saturated and no
additional mass will make ANY difference in cooling.
Save your money and look elsewhere for your cure for high heat problems.
If you would not mind repeating the particulars of your plane and engine
configuration we could work off-list to cover a few points.
Barry
On Wed, Sep 19, 2012 at 12:09 PM, AirEupora <AirEupora@sbcglobal.net> wrote:
> AirEupora@sbcglobal.net>
>
> I have been talking off line with one of our members and he brought up the
> subject of the hollow push rods. I pulled the SI 8 and read through it and
> call my dealer. It would cost me about 1K to install the hollow pushrods
> and lifters, plus it would put me down for a while. I'm not sure of the
> benefit. Lycoming and Cont has been doing it that way for fifty-sixty
> years. It make sense to use the oil to take away the heat from the heads.
>
> Has anybody installed the hollow push rods.
>
> I'm just coming up to five hours on my engine and still battling the
> heating problem. I'm a 1/2" from the ends of the runway and have to shut
> the engine off at the ends as the temp come up to 302 by the time I get
> there and the oil temp are below 104.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=383523#383523
>
>
> Attachments:
>
> http://forums.matronics.com//files/sl8_rev1_201011_109.pdf
>
>
Message 3
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I am not trying to be a wise guy here, but I would just note that the Jabi
ru is not an oil cooled engine; it is an air cooled engine. So fussing ab
out trying to cool the oil some way is possibly looking at the wrong issue.
Also, looking at Ly-cons is not helpful. There is some way to flow air
better, even while taxiing. Beware of "fixes" for problems that are best
solved by airflow. That includes the water cooled heads, "better" carbs
and huge oil coolers.
Just my opinion
Doug Koenigsbeg
-----Original Message-----
From: AirEupora <AirEupora@sbcglobal.net>
Sent: Wed, Sep 19, 2012 12:11 pm
Subject: JabiruEngine-List: SI 8
et>
I have been talking off line with one of our members and he brought up the
subject of the hollow push rods. I pulled the SI 8 and read through it and
call
my dealer. It would cost me about 1K to install the hollow pushrods and
lifters, plus it would put me down for a while. I'm not sure of the benefi
t.
Lycoming and Cont has been doing it that way for fifty-sixty years. It mak
e
sense to use the oil to take away the heat from the heads.
Has anybody installed the hollow push rods.
I'm just coming up to five hours on my engine and still battling the heatin
g
problem. I'm a 1/2" from the ends of the runway and have to shut the engin
e off
at the ends as the temp come up to 302 by the time I get there and the oil
temp
are below 104.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=383523#383523
Attachments:
http://forums.matronics.com//files/sl8_rev1_201011_109.pdf
Message 4
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Even though it is air cooled the oil does a large amount of cooling. The ho
llow pushrod conversion is to get a better supply of oil to the rocker bush
ings.=0A=0AIt also removes the external tubes that feed the oil to the rock
ers. Only relevent to later Hydraulic engines. with fine finned heads, not
retro fittable to early hydraulic engines.=0A=0ACowling is important for go
od temps. Different props can also cause problems with cooling on the groun
d=0A=0AJust from my experence's=0A=0A=0AKeith=0A=0A=0A=0A__________________
______________=0A From: "kayberg@aol.com" <kayberg@aol.com>=0ATo: jabirueng
ine-list@matronics.com =0ASent: Thursday, 20 September 2012 1:46 PM=0ASubje
ct: Re: JabiruEngine-List: SI 8=0A =0A=0AI am not trying to be a- wise gu
y here, but I would just note that the Jabiru is not an oil cooled engine;
it is an air cooled engine.-- So fussing about trying to cool the oil s
ome way is possibly looking at the wrong issue.-- Also, looking at Ly-c
ons is not helpful.-- There is some way to flow air better, even while
taxiing.-- Beware of "fixes" for problems that are best solved by airfl
ow.-- That includes the water cooled heads, "better" carbs and huge oil
coolers.=0A-=0AJust my opinion=0A-=0ADoug Koenigsbeg=0A-=0A-----Orig
inal Message-----=0AFrom: AirEupora <AirEupora@sbcglobal.net>=0ATo: jabirue
ngine-list <jabiruengine-list@matronics.com>=0ASent: Wed, Sep 19, 2012 12:1
1 pm=0ASubject: JabiruEngine-List: SI 8=0A=0A=0A--> JabiruEngine-List messa
ge posted by: "AirEupora" <AirEupora@sbcglobal.net> I have been talking off
line with one of our members and he brought up the =0Asubject of the hollo
w push rods. I pulled the SI 8 and read through it and call =0Amy dealer.
It would cost me about 1K to install the hollow pushrods and =0Alifters, p
lus it would put me down for a while. I'm not sure of the benefit. =0ALyc
oming and Cont has been doing it that way for fifty-sixty years. It make
=0Asense to use the oil to take away the heat from the heads. Has anybody
installed the hollow push rods. I'm just coming up to five hours on my eng
ine and still battling the heating =0Aproblem. I'm a 1/2" from the ends of
the runway and have to shut the engine off =0Aat the ends as the temp come
up to 302 by the time I get there and the oil temp =0Aare below 104. Read
this topic online here: http://forums.matronics.com/viewtopic.php?p=38352
3#383523 Attachments: http://forums.matronics.com//files/sl8_rev1_201011_10
9.pdf ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngin
e-List=0Atp://forums.matronics.com=0A_blank">http://www.matronics.com/contr
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