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Stuart No 10 cylinder ports

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BOB BLACKSHAW14/10/2020 13:48:32
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I'm making R R Raymans high speed marine engine from bar stock,the drawing calls for a Stuart No 10 cylinder. The drawing has no measurements for the port central distances from exhaust to the ports. Any idea please for this as knowing me I would work it out but bound to be incorrect.

Thanks Bob

JasonB14/10/2020 14:21:23
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10v ports.jpg

John Rudd14/10/2020 14:22:08
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My turn to help....

 

From my Stuart 10V drawings, assuming the ports are centrally displaced;

the outer edges of the ports are 7/16" apart, the inner port edges are 9/32" apart. The central port is 1/8" wide centrally displaced. I make the outer port width to be 5/64".

all ports 9/32" high

 

HTH..

ah. Jason beat me...my maths is a bit too slow...😂

 

Edited By John Rudd on 14/10/2020 14:24:53

Edited By John Rudd on 14/10/2020 14:26:17

BOB BLACKSHAW14/10/2020 14:25:44
366 forum posts
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Thanks that's brilliant, Jason, John,

Bob

BOB BLACKSHAW31/10/2020 12:38:42
366 forum posts
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I've started to assemble the engine but have come up with a problem, the slide valve looks on the big size. as when the cam rotates no gap in the valve chest for air intake. On my drawing the slide valve is 5/8ths long is this correct for the Stuart No 10 cylinder. The valve chest on my drawing is 7/8ths so something must be wrong as that leaves 1/8 either side.

Or I've done something drastically wrong. Bob.

JasonB31/10/2020 13:06:23
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My drawing has the valve as 1/2" x 13/32" and the chest cavity as 3/4"x 9/16"

BOB BLACKSHAW31/10/2020 13:35:28
366 forum posts
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Thanks Jason, is the internal gap on the valve slide 3/8ths as it is on my drawing, also the throw on eccentric on mine is 1/8th. This looks like a remake of valve chest and valve as I've made the cylinder to measurements given on the previous post.

Bob

JasonB31/10/2020 13:38:53
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Cavity is shown as 3/8" across the rod and 9/32" along the length of the rod, Eccentric 3/32" offset giving 3/16" total movement.

BOB BLACKSHAW31/10/2020 13:58:46
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Thanks, all the measurements don't work out here, it's a Stuart 10 cylinder measurements but incorrect on other parts on the A A Raymans drawing. I shall bung it in a bag and start on something else .

Bob

Old School31/10/2020 15:14:00
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I have built the high speed marine steam engine, it’s a while ago but I don’t remember any problems with the build. It’s now in a boat with flash boiler it gets up and planes no problem at all.

BOB BLACKSHAW31/10/2020 15:55:07
366 forum posts
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Thanks Old School, I cant work this out. The A A Rayman drawing calls for the Stuart cylinder which in the past post the measurements are given for this so if the casting was used these ports are cast in the casting. I have made the cylinder from bar stock to the measurements required from the post from Jason so the same as the Stuart cylinder. The drawing from A A Rayman calls for a 1/8 th eccentric, so a 1/4 inch total, but if its the same cylinder then it should be 3/32 and not 1/8th, so if the 1/8th was used how can it work? the total length on A A Raymans drawing for the valve is 5/8 th.

Any help please, Bob    Nice pictures of your cars old School .

Edited By BOB BLACKSHAW on 31/10/2020 15:57:06

JasonB31/10/2020 16:12:42
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You may have less lap on your alternative design of valve making it shorter and that would not require a smuch valve movement. Can you scan or post a photo of the valve on AAR's drawing.

BOB BLACKSHAW31/10/2020 16:57:25
366 forum posts
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16041632103855509564792029367320.jpg

BOB BLACKSHAW31/10/2020 16:58:22
366 forum posts
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Thanks Jason, if not I will scan it.

Bob

Old School31/10/2020 17:19:53
360 forum posts
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Bob

I have MAP Specialist Booklet No 9 High Speed Marine Steam Engine by AA Rahman, I can if you wish scan the relevant pages on the engine build if you pm me your email address.

Oliver

BOB BLACKSHAW31/10/2020 17:47:37
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Thanks Oliver, I've got the the same book.

Bob

JasonB31/10/2020 18:07:15
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Bob any chance of a close up of the port and valve sizes, they are a bit fuzzy when blown up then I'll draw it out in CAD

alan-lloyd31/10/2020 19:05:12
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I'm sure back in the 70s when I made a 10v the ports were not cast in the cylinder as they are nowadays

BOB BLACKSHAW01/11/2020 09:35:21
366 forum posts
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Sorry for the delay Jason, My drawing shows that its the same as the Stuart cylinder drawing that you sent me the other day. My drawing is blurred but its 5/64 ths from edge of ports. Why a 1/8th eccentric on the drawing when it should be 3/32. Book states that the ports are cast in the cylinder.

Thanks Bob 16042223963093184445448220250517.jpg

BOB BLACKSHAW01/11/2020 09:35:57
366 forum posts
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16042224742417133511283447033744.jpg

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