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" Rialto" Marine Motor

Old Marine Engine » One and Two Cylinder Gas Inboards » " Rialto" Marine Motor « Previous Next »

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richarddurgee
Senior Member
Username: richarddurgee

Post Number: 1641
Registered: 11-2001
Posted on Wednesday, March 12, 2008 - 12:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

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New For 1914

2 cycle no crankcase pressure !

r14

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paulgray
Senior Member
Username: paulgray

Post Number: 56
Registered: 05-2003
Posted on Wednesday, March 12, 2008 - 07:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Is it me or does that engine have a wipe timer like on a Tuttle???
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richardday
Senior Member
Username: richardday

Post Number: 569
Registered: 11-2003


Posted on Wednesday, March 12, 2008 - 08:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Any idea how this 2 stroke operated?
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Dickie Gibbens
Visitor
Posted on Thursday, March 13, 2008 - 10:03 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

My guess is that a round rod is used connecting the piston to a cross head through a packing nut thus forming the chamber necessary for two cycle operation. A check valve allows outside intake air into the chamber. A connecting rod connects the cross head to the crankshaft. The engine looks tall enough to accommodate this system. Having an oil level, some crankccase lubrication quality is achieved, a sales pitch ensues!
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richarddurgee
Senior Member
Username: richarddurgee

Post Number: 1642
Registered: 11-2001
Posted on Thursday, March 13, 2008 - 10:27 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

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Paul

These external oscilating wiper timers I refer to as Tuttle timers too although a few other Engine Co's. used them, at least Dubrie put a cover over theirs to prevent snagging things and to shed water. Seems the Rialtos timer stuck way out and above the engine was either real handy to get to or was very vulnerable ??

DuBrie Timer
Dub3
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Dick

This is one of those engines that has not shown up on any mfgrs list is not mentioned in Stans books or on Max's list- really lost in annuls of time, sort of a resurrection of the forgotten past with this post. I have been searching that patent date but no luck yet finding it.
I list in my data system about 8 different 2 stroke marine engs with open bases this one must be different design because of the patent ? It would be interesting to see a research article on these uniquely designed engs !

This was one of the better advertised engs around 1907, intersting that they claim to be the only open based 2 cycle eng - in one magazine their open based competion had an ad on the same page !

1907 Palmer-Moore

Pm08

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richarddurgee
Senior Member
Username: richarddurgee

Post Number: 1643
Registered: 11-2001
Posted on Thursday, March 13, 2008 - 11:54 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

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Dickie

This is a great example of the design you explain above it's 1900-01.
I may have posted this before ?

I

I2

I1
I3
I4

Not able to attend this weekends festivities at J.B.'s, my daughter the youngest is getting married soon and an engagement party etc has conflicted, to try to sneak away for a few days would mean sleeping outside for awhile and I'm just getting to old for that !! Will miss the Bateau's, engines, great food, but most of all the wonderful people that get together there each year.

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john_archibald
Advanced Member
Username: john_archibald

Post Number: 50
Registered: 08-2006


Posted on Thursday, March 13, 2008 - 07:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

A friend of mine has given an explanation of how he thinks the Rialto engine works. I've copied in his remarks and will try also to post his graphic of the scheme.

Arch,

If memory serves correctly, the Rialto twin was a differential diameter
(or stepped piston) engine. The pistons have two diameters, a
conventional looking upper portion with a larger diameter lower portion.
The cylinder bores are also of double diameter to receive these pistons.
The larger portion of the piston is the scavenge pump, while the upper
part is the power piston. By arranging cylinders as a parallel twin,
the first cylinder's scavenge pump feeds the second power cylinder, and
vice-versa. With cylinders phased at 180 degrees, everything works
nicely. By isolating the scavenge pump from the crankcase, a plain
bearing, oil lubricated lower end can be used.

Dave

Archibald

.
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john_archibald
Senior Member
Username: john_archibald

Post Number: 51
Registered: 08-2006


Posted on Thursday, March 13, 2008 - 07:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Here is the graphic for the suspected Rialto scheme.


Rialto Engine Scavenging & Piston Scheme

Archibald
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miro
Senior Member
Username: miro

Post Number: 316
Registered: 11-2001


Posted on Thursday, March 20, 2008 - 05:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The Caron engine ( Montreal) is a 2 cycle with a wet oil sump.
It has a long piston and 2 con rods outside the cylinder sleeve.
It was used in DisPro's. But eventually provided too expensive to manufacture competively.
miro
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billschaller
Senior Member
Username: billschaller

Post Number: 150
Registered: 12-2003


Posted on Thursday, March 27, 2008 - 07:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

this one has two pistons per cylinder, too.



as does this one.

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richarddurgee
Senior Member
Username: richarddurgee

Post Number: 1670
Registered: 11-2001
Posted on Friday, March 28, 2008 - 11:10 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

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Penrose 1914

pad1
PAD2


pa1
pa2
pa3
pa4
pa5


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