Oil Suppliers hijacked to motorcycles (split thread)

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c170b53
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by c170b53 »

The rear view mirror was a sure tip-off for me, that was no ordinary Vespa.
Jim McIntosh..
1953 C170B S/N 25656
02 K1200RS
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Kyle Wolfe
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by Kyle Wolfe »

Dang, you guys just made my day!

Some motor porn along with a BL story!
Kyle
54 B N1932C
57 BMW Isetta
Best original 170B - Dearborn, MI 2005
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johneeb
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by johneeb »

More engine porn, so long ago I rebuilt this guy twice. A real education in patience and precision, it only comes into time (because of odd number of teeth on lay and vertical shaft gears) once every 16 revolutions and each combustion chamber volume is set using a graduated burette.
389269_414393915268233_2013474014_n.jpg
John E. Barrett
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n2582d
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by n2582d »

johneeb wrote:... each combustion chamber volume is set using a graduated burette.
389269_414393915268233_2013474014_n.jpg
John, Forgive my ignorance. How was this volume changed? I assume the goal was to match each chamber volume with the others but why would one be different than the next?
Gary
hilltop170
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by hilltop170 »

OK, now it makes sense why we haven't heard from the 27% Scale 170 project for a long time.
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!
hilltop170
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by hilltop170 »

Well, it's good to know you won't be getting bored anytime soon!
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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johneeb
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by johneeb »

n2582d wrote:
johneeb wrote:... each combustion chamber volume is set using a graduated burette.
The attachment 389269_414393915268233_2013474014_n.jpg is no longer available
John, Forgive my ignorance. How was this volume changed? I assume the goal was to match each chamber volume with the others but why would one be different than the next?
Gary,
The variable in volume are due to casting differences in both the heads and the pistons and also very hard to cut valve pockets exactly the same from one piston to the next. We did do Cosworth cylinder heads as Arish mentioned and still checked the volume with the engine assembled. On the Porsche the initial volume is adjusted by metal spacer rings below the cylinder skirt base and then fine adjustment by removing metal from the head.

Picture the (sad) day the car returned to Germany with its new owner!
Porsche Shipment 005.jpg
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n2582d
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Re: Oil Suppliers hijacked to motorcycles (split thread)

Post by n2582d »

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

Post by johneeb »

Aryana wrote:John that Porsche is beautiful. Must have been hard parting with it.

I still regret selling my humble little 912, and now the prices have skyrocketed.
Very hard, however it did allow me to build my 170. Wish I could have figured out a way to do both.
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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?
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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.
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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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