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R26, 1958
R26, 1958
The bike came with the alloy con rod and crank assembly and I found a replacement in good condition. The con rod weighs 6.60 oz. A NOS BMW piston weighs 10.80 oz. A piston from an R50S which will fit the standard R26 cylinder weighs 11.90 oz. A BMW piston from ebay which also fits the cylinder weighs 12.35 oz. Do these different weights matter? Am I overthinking this for a single cylinder machine?
Thanks in advance.
Jeff Rigby 1968 R60/2 & Dnepr sidecar, 1983 R80 ST, 1958 R26, 1968 Ducati Cafe
- schrader7032
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Re: R26, 1958
I am aware of a process to drill a right side oil passage on some twin cylinder models, but that's not going to help you. In the Classic Motorräder Winter of 2015, there was an article by Chris Betjemann about the oil pathways to the R26/R27 rockers. It was taken from the R26/R27 Restoration Manual that Barrington Motor Works wrote. But the article is not about drilling anything, only just describing how the oil migrates from the sump to wash the rockers in oil.
As for weights, those kind of things are somewhat foreign to me. The single cylinder bikes vibrate enough already so the idea of putting mismatched parts or parts that weigh more than OEM seems to wrong way to go. Maybe someone has some ideas...San Arthur?? Certainly Vech at Benchmark Works would have the answers.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- San Arthur
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Re: R26, 1958
As you can see there is a line feeding to the head? Kurt how do you think is getting oil?
The picture belongs to ScottA and it was taken in Europe.
I show it to Perry Bushong (r.i.p.) but we never start the project.
You can find more pictures on my post:
viewtopic.php?f=7&t=10549&hilit=zenaida&start=60
'58 R26 '76 R90S '88 R100RS '94 R100GS/PD
- schrader7032
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Re: R26, 1958
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
Re: R26, 1958
The percentage is based on experience, read 'trial and error', and varies depending on what RPM you want the smoothest operation.
Fifty to sixty five percent is common, BSA calls for 57% for one of it's 500 singles.
BING ""balancing a single cylinder engine" and learn more than you want to know.
- schrader7032
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Re: R26, 1958
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
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Re: R26, 1958
scott