Con-rods and length
- TahoeSteam
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Re: Con-rods and length
Did you decide on traditional journal bearings or roller bearings?
~Wesley Harcourt~
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Re: Con-rods and length
Single row sealed ball, as the whole crank is on ball races, but I've made the journals split for easy removal if required. Pictures will follow on the other post when they are nearer completion. Trouble is ATM I'm running on several fronts at once. Note to self "Must learn to calm/slow down." It's a hobby!TahoeSteam wrote: ↑Thu Oct 17, 2019 1:30 amDid you decide on traditional journal bearings or roller bearings?
Retirement is about doing what floats your boat!
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A BODGE : - A Bit Of Damn Good Engineering.
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Re: Con-rods and length
Referring to the other thread "And Now or the Twin" I finished rounding the small-end yolks and screwed them to the con-rods. Then I discovered the faux pas! Measuring the centres, they seem to be (ARE!) 9" instead of 8". That would push the ratio out to 2.7ish. I must now contemplate if it's worth reducing them back to 8". This is what happens when you keep putting projects down and picking them up again months later!Mike Rometer wrote: ↑Wed Oct 16, 2019 3:26 pm
8" con-rods, giving a stroke/rod ratio of 2.42424 etc.
I don't think it will look ungainly or over-tall.
Now I'm wondering should I make them a fancy section . . . . .
Retirement is about doing what floats your boat!
A BODGE : - A Bit Of Damn Good Engineering.
A BODGE : - A Bit Of Damn Good Engineering.
- TahoeSteam
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Re: Con-rods and length
Is there/will there be any interference caused by the longer rods? If not, I'd suggest just running them. That is unless you just absolutely cannot stand it.
~Wesley Harcourt~
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Re: Con-rods and length
Fortunately I haven't yet cut the pillars,or even started to the valve gear, so little reason why not.TahoeSteam wrote: ↑Mon Nov 09, 2020 9:36 pmIs there/will there be any interference caused by the longer rods? If not, I'd suggest just running them. That is unless you just absolutely cannot stand it.
Retirement is about doing what floats your boat!
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A BODGE : - A Bit Of Damn Good Engineering.
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Re: Con-rods and length
Despite there being no reason not to leave the extra length on the rods, pride (it comes before the fall), devilment, determination, whatever, I decided to reduce them anyway. Carefully re-measured, marked, set up in the lathe, picked up the thread and cut. No problems! (?) Having completed, I placed my largest digi vernier into the bearing holes and Aaagghhhhhhhhhhh ( the fall?) it seemed under-size. Then I remembered that with that vernier you need to add 1/2" to all inside measurements. Dohh!
Checking both they are equal within 0.003" centre to centre, and weight difference just on 0.3gm. I'll live!
Checking both they are equal within 0.003" centre to centre, and weight difference just on 0.3gm. I'll live!
Retirement is about doing what floats your boat!
A BODGE : - A Bit Of Damn Good Engineering.
A BODGE : - A Bit Of Damn Good Engineering.
- Lopez Mike
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Re: Con-rods and length
I'm so glad to see someone else using anti friction bearings. Even my Strath single still has a plain brass big end though the mains are single row balls.
If I ever have any trouble with the big end I will re-engineer the crank for a sealed ball bearing. That would leave me with only one oil cup for the crosshead. My eccentrics are ball bearing now. Now if I could only figure out a Watts linkage or some such thing to get rid of that last sliding surface.
Of course without all of the gore slinging about the engine would probably rust away.
Let's see. Go to a zero drip stern packing. No lubrication of the engine. No internal oil already. Next comes the tiled floor and red velour cushions I suppose. I can always get all cranked up about marlin spike ornamentation I suppose. Turk's heads all over the place. Not soon.
Mike
If I ever have any trouble with the big end I will re-engineer the crank for a sealed ball bearing. That would leave me with only one oil cup for the crosshead. My eccentrics are ball bearing now. Now if I could only figure out a Watts linkage or some such thing to get rid of that last sliding surface.
Of course without all of the gore slinging about the engine would probably rust away.
Let's see. Go to a zero drip stern packing. No lubrication of the engine. No internal oil already. Next comes the tiled floor and red velour cushions I suppose. I can always get all cranked up about marlin spike ornamentation I suppose. Turk's heads all over the place. Not soon.
Mike
If you think you are too small to make a difference, try sleeping with a mosquito.
Dalai Lama
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- fredrosse
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Re: Con-rods and length
Crosshead - How about a roller bearing arrangement? Watt mechanism would be wonderful, but takes up lots of space, and has pivoting joints that also need bearings. A roller (or ball) bearing, with a spherical outer race (common on many self-aligning pillow blocks or flange bearings), riding in a cylindrical crosshead guide. That could eliminate this sliding bearing location.
- Lopez Mike
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Re: Con-rods and length
I'll give that some thought. I've always liked Watts linkages because there were just pivots. No siding areas that drip oil all over the place.
The one such engine I have is just a Stuart walking beam engine and the loads are very light. On my launch engine the needle bearings for the pivots would have to take some forces and be sealable to suit me.
Oh, well. Wiping oil off of the engine gives me something to do while I'm waiting for a babe to walk down the dock looking for a ride.
Mike
The one such engine I have is just a Stuart walking beam engine and the loads are very light. On my launch engine the needle bearings for the pivots would have to take some forces and be sealable to suit me.
Oh, well. Wiping oil off of the engine gives me something to do while I'm waiting for a babe to walk down the dock looking for a ride.
Mike
If you think you are too small to make a difference, try sleeping with a mosquito.
Dalai Lama
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Re: Con-rods and length
Lopez Mike wrote: ↑Fri Nov 13, 2020 4:21 am[snip]
Oh, well. Wiping oil off of the engine gives me something to do while I'm waiting for a babe to walk down the dock looking for a ride.
Funny, Mike!
Wiping down the engines also gets us up close for periodic inspections.
Always a good idea with reciprocating machines.
RussN