Stuart Victoria Query

This topic has 6 replies, 4 voices, and was last updated 19 April 2021 at 19:35 by JasonB.

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18 April 2021 at 16:25 #540396
Clive Brown 1
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@clivebrown1
I'm just starting to build a Stuart Victoria engine.On examining the drawngs, I'm slightly surprised that the crankshaft is positioned 1/4" above the cylinder centre-line. Does this height difference have a noticeable effect on the running of the engine, eg a slightly uneven exhaust beat. Do any other Stuart horizontals have this feature? Just curious.

Clive
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18 April 2021 at 16:25 #3450
Clive Brown 1
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@clivebrown1
18 April 2021 at 17:08 #540402
JasonB
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@jasonb
Should not be. The ctr height of the hole in the main bearings is 5/8" from bottom. (wrong on the 1993 drawings) The ctr line of the holes in the cylinder support brackets are 5/8" from bottom and adding up the various bits of the cross head guide put the cross head pin 5/8 up.

Horizontal green ctr line runs straight through all three points

You may want to have a look at this thread where depending on what drawings and or book you are working from there are errors, I'll going to post a set of corrected drawings soon if you can wait.

Edited By JasonB on 18/04/2021 17:16:14

Edited By JasonB on 18/04/2021 17:21:42
18 April 2021 at 18:35 #540417
Clive Brown 1
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@clivebrown1
Thanks Jason. I have the 1993 drawings. I had read the linked thread where discrepancies were pointed out but these seemed to relate to the longitudinal positions of the cylinder, slide-bars etc. I've fabricated the bed and was intending to measure up as the job progressed and make items such as the con-rod to suit. However, my drawing clearly dimensions the main bearings at 7/8" above the bed compared with the cylinder at 5/8". Scaling off the drawings also confirms these figures, the draughtsperson must have been having a bad day. I'll make my bearings 5/8" as you advise.

I await your corrected drawings with interest.

PS.I wonder how many Victorias have been made with the height difference?

Edited By Clive Brown 1 on 18/04/2021 18:44:54
19 April 2021 at 08:38 #540462
Steve Withnell
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@stevewithnell34426
Mine certainly has! It's not getting rebuilt now…

Victoria

You can hear the big end knocking, that I will fix one day Usual shortage of 'roundtuits'.

Steve
19 April 2021 at 19:31 #540572
duncan webster 1
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@duncanwebster1
Lots of GWR locos had the cylinder centre line above the axle centre line, didn't seem to bother them over much. Makes valve timing a bit different, but Steve's video shows it doesn't matter much
19 April 2021 at 19:35 #540573
JasonB
Moderator
@jasonb
I think the problem was a bit of early cut & paste when the '93 drawings were done and a few bits from the beam got copied rather than having the subtle alterations done for the Vic.

I've a set of castings for a smaller ball hopper engine that like the full size has an offset crankshaft.
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