Today's Message Index:
----------------------
1. 03:42 AM - Re: Ram heads with bigger valves (gary)
2. 07:54 AM - Re: Ram heads with bigger valves (HINDE,FRANK (HP-Corvallis,ex1))
Message 1
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| Subject: | Re: Ram heads with bigger valves |
--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
Frank,
Where are your EGT's? (before or after the bend, how far from heads). Do
you have anyone else's EA-81 EGT;s t compare to with sensors in the same
spot?
How did you set your mixture - plug color? I never checked mine and Ron
didn't think I needed to make any changes so I left it alone.
Gary
----- Original Message -----
From: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Subject: Stratus-List: Ram heads with bigger valves
> --> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
>
> Hi guys,
>
> When I had my heads done, Ron installed bigger valves and did some porting
> work. Not expecting to do any extra work I did a static run up with the
> plane tied to a post to check the carb mixture settings as per the Bing
> service manual...Which I have since misplaced so if anyone wants to donate
> me a photocpy for all the nice advice my employer allows me to type.....:)
>
> Anyway, to my horror I found the carbs were set WAY too weak. Now
> interestingly Stratus did claim that my heads had shown signs of
overheating
> which was another convenient "smoking gun" for them to explain why my
valve
> guides fell out for the third time.....But don't get me started....:)
>
> It MAY be that my carbs were set up weak to begin with by Stratus, I have
no
> way of knowing 'cus I never checked the mixture prior to having Ram work
on
> the heads.
>
> Anyway, bottom line is I had to increase my main jet by about two sizes
and
> my mid range jet went up quite a few sizes...Of course I can't remember by
> how much, I do know it was an awful lot of time to get them right.
>
> What I will do is check my paperwork this evening and confirm to this list
> what jets I have in there, I will then write it in my maintenance log as
> well!
>
> So the moral is, if you have had this work done you really need to check
> your jet sizes. Even though my plugs show correct colour I still see
pretty
> high EGT's like 1400F at cruise. I would hate to run this engine on the
lean
> side as these temps may be much higher leading to short engine life.
>
> I will confirm what sizes tomorrow, but remember this is specific to MY
> engine with bigger valves. You would still need to check yours.
>
> Frank
>
>
Message 2
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| Subject: | Ram heads with bigger valves |
--> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
I would definatly check your plug colour...simply from the fact mine was
miles out, but that was after installing bigger valves.
The EGTs are after the bend.
What you need to do for a quick check is to tie you airplane down and run it
up to cruise (and that is defined as between 1/4 and 3/4 throttle) for 30
seconds or so...Watch the cooling!...Cut the engine WITHOUT closing the
throttle and pull the plugs...If they are stark white the misture is too
weak. There should be a white/tan colour. You can fine tune your mixture by
raising the needles. If you get to the top position and still need more you
have to upsize the nedle jet.
Get back in and do the same thing at full power to check the main jets.
It's a hassle but burnt valves are much MORE hassle....:)
FRank
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of gary
Subject: Re: Stratus-List: Ram heads with bigger valves
--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
Frank,
Where are your EGT's? (before or after the bend, how far from heads). Do
you have anyone else's EA-81 EGT;s t compare to with sensors in the same
spot?
How did you set your mixture - plug color? I never checked mine and Ron
didn't think I needed to make any changes so I left it alone.
Gary
----- Original Message -----
From: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Subject: Stratus-List: Ram heads with bigger valves
> --> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
>
> Hi guys,
>
> When I had my heads done, Ron installed bigger valves and did some
> porting work. Not expecting to do any extra work I did a static run up
> with the plane tied to a post to check the carb mixture settings as
> per the Bing service manual...Which I have since misplaced so if
> anyone wants to donate me a photocpy for all the nice advice my
> employer allows me to type.....:)
>
> Anyway, to my horror I found the carbs were set WAY too weak. Now
> interestingly Stratus did claim that my heads had shown signs of
overheating
> which was another convenient "smoking gun" for them to explain why my
valve
> guides fell out for the third time.....But don't get me started....:)
>
> It MAY be that my carbs were set up weak to begin with by Stratus, I
> have
no
> way of knowing 'cus I never checked the mixture prior to having Ram
> work
on
> the heads.
>
> Anyway, bottom line is I had to increase my main jet by about two
> sizes
and
> my mid range jet went up quite a few sizes...Of course I can't
> remember by how much, I do know it was an awful lot of time to get
> them right.
>
> What I will do is check my paperwork this evening and confirm to this
> list what jets I have in there, I will then write it in my maintenance
> log as well!
>
> So the moral is, if you have had this work done you really need to
> check your jet sizes. Even though my plugs show correct colour I still
> see
pretty
> high EGT's like 1400F at cruise. I would hate to run this engine on
> the
lean
> side as these temps may be much higher leading to short engine life.
>
> I will confirm what sizes tomorrow, but remember this is specific to
> MY engine with bigger valves. You would still need to check yours.
>
> Frank
>
>
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