Author Topic: Barber 4 stroke boat engine  (Read 1799 times)

Offline sid pileski

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Barber 4 stroke boat engine
« on: February 12, 2022, 12:38:32 AM »
This will be a very long project, but I thought I'd show the inspiration for the model.
Between doing work for other customers and what not, sometimes finding time for my own projects is challenging.

Anyway, here is the full size engine:









I've  already got the gear from HPC gears in England.
About $100.00 to my door.
They should work well.



Thanks, Sid


Offline crueby

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Re: Barber 4 stroke boat engine
« Reply #1 on: February 12, 2022, 12:56:00 AM »
Looks like a great project. What scale will the model be?

Offline sid pileski

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Re: Barber 4 stroke boat engine
« Reply #2 on: February 12, 2022, 01:13:47 AM »
Chris- I'm not really scaling it to anything specific.
That's why I'm saying inspired by.
The bore will be 1.50"
I'm still working out details of the rest of it.
I've got a CAD model started.

Sid

Offline Dave Otto

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Re: Barber 4 stroke boat engine
« Reply #3 on: February 12, 2022, 01:47:20 AM »
Looking forward to following along Sid.


Dave

Offline Admiral_dk

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Re: Barber 4 stroke boat engine
« Reply #4 on: February 12, 2022, 12:44:14 PM »
Interestingly looking engine - first time I see double rockers per valve.

Will be following with interest  :cheers:

Per

Offline Phil1965

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Re: Barber 4 stroke boat engine
« Reply #5 on: February 12, 2022, 01:40:52 PM »
Look forward to following

Phil

Offline Jasonb

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Re: Barber 4 stroke boat engine
« Reply #6 on: February 12, 2022, 02:01:24 PM »
As I said in your earlier thread I do like the look of some of these early boat engines and outboards so will be following closely. Should make a nice size model at 1.5" bore, about the same as the lightweight that is did a while ago.

Will it all be fabricated and cut from solid or are you thinking of getting some parts cast?

Online Roger B

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Re: Barber 4 stroke boat engine
« Reply #7 on: February 12, 2022, 06:47:27 PM »
The rocker gear certainly has some interesting shapes  ::) I will be following along  :)  :ThumbsUp:  :wine1:
Best regards

Roger

Offline d.williams

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Re: Barber 4 stroke boat engine
« Reply #8 on: February 13, 2022, 01:36:48 AM »
That’s a very interesting engine and should make for a great project. The valve gear arrangement puts me in mind of the Hicks line of marine engines. I will enjoy following along. I don’t understand much, but am curious about your helical gear set. Will it provide you with the same camshaft rotation direction as the gears on the original engine?

Don Williams

Offline sid pileski

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Re: Barber 4 stroke boat engine
« Reply #9 on: February 14, 2022, 04:56:09 PM »
The  engine will be fab'd from solid, no castings.
For the cylinder, I'll be using pre-honed hydraulic tubing. 1.5 ID x .25 wall.
Upper, mid and lower flanges will be soldered on.
I (and by I, I mean Dan Williams) used 1.00" tubing on a project he's doing, when we re-engineered the design a little bit.

Dan- I don't really know what direction the real engine runs! Haven't got that far. I've always liked when looking at the flywheel, it turns clockwise.

Here's the CAD model so far:




Offline Jasonb

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Re: Barber 4 stroke boat engine
« Reply #10 on: February 14, 2022, 06:32:29 PM »
In theory it should not matter which way the camshaft turns, just set the cams on it to give the right valve events. May make a difference for an engine that would have been expected to run for 1000s of hours but a bit of gear noise, side thrust and not quite true to original should be OK for a model and as you say it's "based on" rather than an exact replica.

Offline sid pileski

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Re: Barber 4 stroke boat engine
« Reply #11 on: February 24, 2022, 04:44:04 PM »
Here are some updates tot he CAD model.
I'm not sure I like the spoked flywheel. Most marine engines I've seen all use a solid flywheel.
I speculate that is because in the day, the engine was not really out of the way. I think a spoke wheel would be more of a hazard.
Anyway, it's coming along.



Offline Jasonb

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Re: Barber 4 stroke boat engine
« Reply #12 on: February 24, 2022, 06:19:48 PM »
From the photos that you posted I could not see anything that suggests a spoked flywheel, it looks like a recessed disc with a wider rim to me. :headscratch:

As marine engines tend to be down in the bottom of the hull to keep the prop shaft as straight as possible they tended to have smaller dia flywheels so the solid pattern added more weight to counter the reduced diameter.

Offline sid pileski

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Re: Barber 4 stroke boat engine
« Reply #13 on: February 24, 2022, 06:32:12 PM »
From the photos that you posted I could not see anything that suggests a spoked flywheel, it looks like a recessed disc with a wider rim to me. :headscratch:

As marine engines tend to be down in the bottom of the hull to keep the prop shaft as straight as possible they tended to have smaller dia flywheels so the solid pattern added more weight to counter the reduced diameter.

Jason- that's exactly what I was saying. I don't like the spoked flywheel. I know the proto has a disk.    ;)
I may start out this way. The flywheel I modeled is bronze from Martin model.
Get it running and go from there.

Sid

 

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