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Old Dec 07, 2012, 09:55 AM
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Reginald's Avatar
Belgium
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Originally Posted by Reginald View Post
The OS H-60 RC dates from 1967
I was rather curious myself so I quickly dismantled the engine and here are some pictures. Still very oily but no real visible dirt ! The previous owner did take care of his engines. Bronze conrods. One has to look really well but in the last picture you can see a hair-size line, that is where both parts of the rod do join at the bottom, a very unusual method. Very well made indeed. And very precise fittings all over, no sloppy fits anywhere. I was told that the builder was a precision-fitter at Republic and it shows.
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Old Dec 07, 2012, 01:23 PM
Sticks, Tissue & old Diesels
brokenenglish's Avatar
France, Centre, Amboise
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Thanks Reggie, Super!
Obviously, the rods can't be on the same crank-pin (I had a "senior moment"!).
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Old Dec 07, 2012, 01:56 PM
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Belgium
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Originally Posted by brokenenglish View Post
Thanks Reggie, Super!
Obviously, the rods can't be on the same crank-pin (I had a "senior moment"!).
Yes. And pretty difficult to make a crank this way. Has to be very hard steel to avoid "bending". Typical failures (to me) are fe the FMO twin or the Craftsman twin. The Hiness twin as well. Did have those engines. Wonder how he did those conrods however.
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Old Dec 07, 2012, 05:51 PM
Good Better Best quest.
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Australia, VIC, Cranbourne East
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Originally Posted by brokenenglish View Post
Thanks Reggie, Super!
Obviously, the rods can't be on the same crank-pin (I had a "senior moment"!).
I did also forgot about the crankcase compression .
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Old Dec 08, 2012, 10:58 AM
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Belgium
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OS Max 60-H

Fiddling with this twin reminded me of the fact I am still in need for a Max 60-H
piston, have a near-new Blackhead lying about without piston. Will pay a good price for one and may be used, ring is no problem.
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Old Dec 13, 2012, 07:26 PM
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Canada, AB, Calgary
Joined Apr 2006
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Saito FA 30 4-stroke MKI & MKII

Are there any other difference between MK I & MK II, aside from the rocker arm, MK I Cast alum, MK II machined steel?. Why did they changed to steel rocker arm?
The cast rocker arm seems more appealing to look at. Any info or comments much appreciated.
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Old Dec 13, 2012, 09:06 PM
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Canada, ON, Caledonia
Joined Aug 2007
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Mathe

Don't think I posted this one, it's a brute. 25cc made in Italy about 79 or 80.
I would have to go and look again but this has a very low serial # and not mant were made.
This company has been in business since and specializing in high performance boat engines.
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Old Dec 13, 2012, 11:37 PM
"Unnecessary Necessity"
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Canada, BC, Vancouver
Joined Sep 2006
5,615 Posts
Mathe engines are still very popular in Europe for the offshore racing class and large scale cars. Here is a bit of their history:
http://www.matheengines.com/history.htm
The airplane versions are less often seen! Here is some boat action
Modified Gas Boat Racing on the Fore Shore Trinidad! (0 min 38 sec)
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Last edited by coriolan; Dec 13, 2012 at 11:48 PM.
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Old Dec 14, 2012, 12:41 AM
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Belgium
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Originally Posted by apilgrim View Post
Are there any other difference between MK I & MK II, aside from the rocker arm, MK I Cast alum, MK II machined steel?. Why did they changed to steel rocker arm?
The cast rocker arm seems more appealing to look at. Any info or comments much appreciated.
Just think : what is more delicate and prone to break ? Those high positionned alu rockers or the much lower compact steel ones ?
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Old Dec 14, 2012, 09:14 AM
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Upper Arlington, Ohio
Joined Dec 2007
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My G46 not the much more common ST46 built on the same G21 case as the .29/35.

Will go in a 1050sq in Kerswap
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Old Dec 14, 2012, 10:49 AM
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Canada, AB, Calgary
Joined Apr 2006
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SAITO FA-30 rocker arm

Quote:
Originally Posted by Reginald View Post
Just think : what is more delicate and prone to break ? Those high positionned alu rockers or the much lower compact steel ones ?
Thanks for your input
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Old Dec 16, 2012, 03:41 PM
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Hello to all.
Does anyone have an engine review on the Enya 09 IV?
Thanks in advance
Carlo
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Old Dec 18, 2012, 08:48 PM
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Adelaide, South Australia
Joined Sep 2003
2,997 Posts
Irvine 61RLS

I managed to pick up a NIB Irvine 61RLS off the bay and it arrived yesterday. Now I have the big brother to my 40RLS .

Looking at the parts list it's obvious the RLS is quite different to the standard 61R in much the same way my 40RLS is different to the 40R by using a mix 'n match from other engines. The RLS uses the crankcase from the 61R but the head, piston/liner, wrist pin and gasket set are peculiar to the RLS. The con rod, crankshaft and wrist pin circlips all come from the Irvine 72. Sometime soon I'll be stripping it down to take some measurements to compare with my (also new) Dykes ringed Irvine 61R which is on the left in the photo.
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Old Dec 19, 2012, 02:35 AM
Sticks, Tissue & old Diesels
brokenenglish's Avatar
France, Centre, Amboise
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Originally Posted by stg61abc View Post
Hello to all.
Does anyone have an engine review on the Enya 09 IV?
Thanks in advance
Carlo

Carlo, the model with RC carb (Enya 19-IV TV) was tested by Peter Chinn in A/M January 1969.
Would that be of interest? I can scan it, no problem.
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Old Dec 19, 2012, 04:40 PM
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Originally Posted by brokenenglish View Post
Carlo, the model with RC carb (Enya 19-IV TV) was tested by Peter Chinn in A/M January 1969.
Would that be of interest? I can scan it, no problem.
Thanks so much matey. In fact Im looking for the review on th Enya 09 IV
Thanks by your kindness
Carlo
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