Oil Suppliers hijacked to motorcycles (split thread)

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johneeb
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by johneeb »

n2582d wrote:Very interesting! I’m astounded by the technical talent so many of the members here have.

So if you’re milling the pistons to match valve pockets where do you remove metal to match piston weight? I imagine at the rpm these engines turn everything moving internally is matched weight-wise down to a fraction of a gram.
Gary, with your experience you must have seen the inside of an engine that has been balanced, there will be belt sander impressions on both ends of the connecting rods and crankshaft counter weights and the under side of piston dome will have very shallow drill marks. All very important, especially when you want to turn up the RPM like the engines in Arash's bikes.
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hilltop170
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by hilltop170 »

I wonder what the dynamic balance on this is?

Probably measured in ft-lb! 8O
P&W R985 master and link rods
P&W R985 master and link rods
Richard Pulley
2014-2016 TIC170A Past President
1951 170A, N1715D, s/n 20158, O-300D
Owned from 1973 to 1984.
Bought again in 2006 after 22 years.
It's not for sale!
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GAHorn
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by GAHorn »

hilltop170 wrote:I wonder what the dynamic balance on this is?

Probably measured in ft-lb! 8O
C7042D9E-0A83-4425-BC6A-89DD9A12448D.jpeg
At the typical 1800-2000 RPM it hardly makes a difference (especially when compared to the steel prop some of them twisted) :lol:
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons. ;)
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johneeb
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by johneeb »

hilltop170 wrote:I wonder what the dynamic balance on this is?

Probably measured in ft-lb! 8O
C7042D9E-0A83-4425-BC6A-89DD9A12448D.jpeg
Richard, do you put lights on that at Christmas time?
John E. Barrett
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johneeb
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by johneeb »

crankshaft balancer.jpg
Arish here is picture of a Stewart Warner Crank Shaft Balancer similar to the one the shop who did our balancing used. You can see the adjustments to the counter weights are made with a belt sander, I don't think any of our cranks were so far out that they had to take metal away by drilling. Our pistons did have metal removed from the underside using an end mill.
John E. Barrett
aka. Johneb

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hilltop170
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by hilltop170 »

johneeb wrote:
hilltop170 wrote:I wonder what the dynamic balance on this is?

Probably measured in ft-lb! 8O
C7042D9E-0A83-4425-BC6A-89DD9A12448D.jpeg
Richard, do you put lights on that at Christmas time?

Good idea John! It's in Del's shop in Mena, AR
Richard Pulley
2014-2016 TIC170A Past President
1951 170A, N1715D, s/n 20158, O-300D
Owned from 1973 to 1984.
Bought again in 2006 after 22 years.
It's not for sale!
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GAHorn
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by GAHorn »

Check this story out....(You'll have to scroll thru all the pics to get the full story): https://www.msn.com/en-us/autos/motorcy ... hp#image=1
BBIQIBI.jpg
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons. ;)
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