Does anyone know wich of the 2 main Oliver Tiger 15 (2.5cc) motors is the exact copy of the original MkIII ?

I have a MkIII that I have chesished for years, but it has had a repair to the crankcase.
I would like to replace the crankcase but am told the "CS" versions might have slightly different dimensions but the Australian ones might be correct ?

Or, on the other hand, does anyone know where I might be able to get an original O.T. crankcase

ghost,

I do not have the Australian one but here is an original Mk-3 on the left and a CS replica on the right.

George

Thanks for the input George

They certainly look the same from the outside, tho I have to say the castings on the CS don't look as nice as the O.T. ones do they.
I wonder how the alignment and tolerances compare - One guy I spoke to reckons the CS ones use metric bearings as opposed to the imperial ones used in the original ?

Do you notice any difference in performance, smooth running and starting between them ?

Ghost,

The CS can be easily spotted as it has a flat-bottom profile to the case whilst the original Ollie has that characteristic rounded "under-belly."

I have some friends in the UK who fly nostalgia C/L combat and mix the CS engines in with the originals. They say they run about the same.

Also...you can get the CS Olivers in the US for a lot less than in the UK.

My friend from Scotland was over here a couple of years ago and mentioned they were around $120.00 each and it took six months to get one. I made a quick call and we ordered three of them at $65.00 each and they were here in three days. Sure flipped his kilt over the price and availability here.

Hey Dan that sure is a good price !

If I hadn't got my JSO origina,l I would be asking you to do me a favour [8D]

Just for the record, I have sourced a supplier here in the UK, a guy who, I think is well known to most of us, that is Ian Rustle, aka "Rustler" of Merco fame etc. In case any one needs it, his email is [email protected]

The crankcase will cost me £30 including postage within the UK - I am not unhappy with that, but when Dan can get a whole CS olly for $65 it does seem high

Mr. Ghost, I am a Merco fan, I have about 8 of them, I missed out on the .61 Diesel though, Mr. Carlson keeps saying that he has a couple of used .61 Diesels and will clean one up and send it to me but so far it hasn't happened. My black .50 will fly all day turning a 12x6 Graupner at 8,500 rpm with nary a hiccup. People totally misunderstood how to run a Merco and tried to run them with 10x6s then were disappointed when it wouldn't happen. I am beginning to think it's not possible to wear one out. I do have a petrol .61 that may be the smoothest running engine I own.

Hi there

Drifting off topic

I have never seen a big diesel running.
I would like too because I find it interesting that in my youth, (1960's) engines like the AmCo 5cc diesel were considered the biggest one could go, and even then they were considered a bit of an oddity and not commonly used.

Diffucult starting and vibration / rough running being the reasons quoted then for there unpopularity.

However I know that PAW now manufacture 10cc (.61) diesels, and many like yourself are very happy with their big, converted Glo motors.
I wonder what has changed to make them useable and popular these days ?

Hi Ghost,

We bought those CS Olivers a few years ago, don't know if that price is still correct but here is the site we got them from.

http://home.earthlink.net/~whizzz/welcome.htm

My friend from Scotland used his credit card and James shipped them to my house.

Drop that site an e-mail and see what James says about pricing.

Didn't Ian Rustle make a 1.5 Oliver Tiger Cub replica? I think there were several "Rustler" Oliver reproductions...maybe even a 1.0cc version.

Ghost123 think you folks in the UK are very steeped in tradition (nothing wrong with that) I own paws 03,06,09, 19, and a 40 with the
40 I think PAW made the leap to a balanced larger engine,you must remember that a glow engine by defination is a semi-diesel granted the action of the the alcohol thru catalytic action keeps it hot and running Bob davis reasoned more than 25 years ago that a modern balanced glow engine would run quite well with a compression head that you of course vary the compression just like the little ones and time has proven him quite right thus we have a large choice of larger engines converted to diesel a case in point is the MVVS 61 which you can get with both a glow and diesel head break in in glow then converted to diesel the advantages are more power
and less fuel consumed than running alcohol based fuel in the glow versions of all the conversions, on the tradition thing Paul Landel
of Just engines was here in Florida on a holiday we met and I took him flying. He was surprised I was running muffler pressure on a Irvine 53 conversion diesel quote "we do not do that in the UK" and he was right as far as the paws went but the modern conversions
with the stock glow carbs do not have the suction of the small diesel ones and now of course Enya took the leap and the 25 is available
as a diesel see posts on this site on them so yes at least here more folks are using the big ones I think the same has happened with t your cousins "down under" also.I am certainly not knocking the small traditional ones { I own some) but they really come on in the 40 thru 90 class planes hope this helps martin as a footnote some of the guys have converted the larger petrol ignition engines to diesel

Interesting stuff there dieseldan

Tell me, how do these big diesels react to being throttled back, do they go cool and start burrping or do they run smooth and pick up just fine ?