New engine

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svenolivier
Posts: 18

New engine

Postby svenolivier » Fri Jan 10, 2020 9:54 am

Hi All
Just blew the #4 cylinder on my Ardem X 1845 cc engine as i was cooling her down after aerobatics - at 51C and 2300 rpm the barrel and cylinder disintegrated, I was hi key for circuit so throttled back and landed without further incident.

This happened at about 30 hours of flying the last 9 months after the aircraft not flown for 20 years - so perhaps not unexpected (the engine had not bee run after the 1845 conversion (which was done 20 years ago).

I would very much appreciate advice from this august group - rebuild? great plains? Aerovee? other VW conversions?

the le burgh ignition works really well so i am content to swing the prop

I look forward to any suggestions

Sven Olivier
worcester south africa
ZS-UDT

Neil Spooner
Posts: 530
Location: Ardleigh, Colchester, Essex, UK
Contact:

Re: New engine

Postby Neil Spooner » Sun Feb 09, 2020 10:05 pm

Hi,
Gt Plains 2180cc engine, force1 hub & Aluminium cylinders would be my first choice.
Neil
A little help goes a long way.
Nipper G-BRPM and G-BALS
RV4 G-IKON

svenolivier
Posts: 18

Re: New engine

Postby svenolivier » Tue Feb 11, 2020 12:00 pm

Hi Neil

I got hold of an Aerovee 2.1 with 50 hours together with the propeller. It seems to me that the starter wont' fit, and as it won't start by hand-propping that i have to go back the the LeBurg / Surefire ignition systems.
So have stripped the wonderful ignition systems out and the engineering shop has fitted the alternator which was in the old engine.
So i can start fitting things soon - i hope.
I suspect the i will also have to upgrade the original carburetor - i have a single Zenith Stromberg i can use?
Any comment or re-directions are most welcome :)
Many thanks

Sven
Last edited by svenolivier on Tue Feb 11, 2020 5:44 pm, edited 1 time in total.

svenolivier
Posts: 18

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Postby svenolivier » Tue Feb 11, 2020 12:00 pm

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Neil Spooner
Posts: 530
Location: Ardleigh, Colchester, Essex, UK
Contact:

Re: New engine

Postby Neil Spooner » Tue Feb 11, 2020 1:47 pm

Hi Sven,

I have no experience with the Aerovee engine, the block will be fairly standard, however, having just done some research ( http://www.aeroconversions.com/support/ ... Manual.pdf ) I see that the prop' flange is elongated relative to the VW one......I would not be comfortable with this in an a/c that is used for aerobatics, as it puts enormous stress on the crankshaft end that was only designed to accommodate pulley loads originally. (Hence my suggestion for the Force 1 hub). The gyroscopic forces are significant. Depending on the crankshaft it may be possible to substitute it with the original hub from your Ardem engine?

I used an Ed Sterba prop' on my Nipper, which was wooden and very light, it also worked very well. There is a PTL (Prop' Type List) here for the Nipper: http://www.lightaircraftassociation.co. ... %20123.pdf Interestingly it is not complete, as it doesn't show my prop' on G-ONCS. Sadly I have sold it and don't have that info' now.

The engine/propeller combination needs to be matched to the airframe......a draggy airframe will have a fine pitch, conversely a slippery one will have a course pitch......you may be lucky depending on what this prop' came from. I would highly recommend fitting a vacuum gauge either permanently or temporarily during development of the installation. I find it very useful during "tuning" of the prop'/engine setup, and also for detecting degradation of the engine during service.
Have you looked at the weight of the Aerovee against the Ardem? I recommend you weigh both for W&B.
The Stromberg should work fine, but you may have to fit a new needle. Do you have CHT and EGT gauges? That will help setting up the Carb'.
Neil
A little help goes a long way.
Nipper G-BRPM and G-BALS
RV4 G-IKON

svenolivier
Posts: 18

Re: New engine

Postby svenolivier » Tue Feb 11, 2020 5:44 pm

Hi Neil

The next step is to substitute the prop flange set-up which also includes the magnetic pick-ups for the Le Burg. Given your advice that is now a definite step.
I will check the prop specs (- it is a Sensenich W54JV5L 44 -) it came with the engine from a Sonex - and thank you for the link
I will fit a vacuum guage
and i have CHT and EGT gauges :)
The Stromberg is in for an overhaul and i have asked to fit it with the correct needle.
I also purchased a new oil cooler - i think there might be a lot of metal bits in the present one
No doubt is W&B will be done - the weighs seem similar ex the manual (162 lbs if i recall correctly).
Many thanks again

Sven

Neil Spooner
Posts: 530
Location: Ardleigh, Colchester, Essex, UK
Contact:

Re: New engine

Postby Neil Spooner » Wed Feb 12, 2020 12:00 am

The sonex is slippery.....you may be able to repitch the prop, there is a prop builder over here who would get a spokeshave out & tweek the prop without even taking it off!
Neil
A little help goes a long way.
Nipper G-BRPM and G-BALS
RV4 G-IKON

svenolivier
Posts: 18

Re: New engine

Postby svenolivier » Tue Mar 10, 2020 7:32 pm

Aerovee installation progressing - dual ignition and carburetor (and new fuel line) installed. New manifold for the dual ports. New prop hub machined and ready for installation. New throttle cable. New oil cooler and new hoses ready for installation. New spark plug leads :)
Attachments
SKWH2194.JPG
new prop hub
SKWH2194.JPG (94.17 KiB) Viewed 938 times
IMG_0850.JPG
Getting there :)
IMG_0850.JPG (2.19 MiB) Viewed 938 times

Neil Spooner
Posts: 530
Location: Ardleigh, Colchester, Essex, UK
Contact:

Re: New engine

Postby Neil Spooner » Thu Mar 19, 2020 9:03 am

Very nice!
Is the prop' hub shrink fit? How much did it cost you please?
Neil
A little help goes a long way.
Nipper G-BRPM and G-BALS
RV4 G-IKON


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