Author Topic: torque value conversions  (Read 1326 times)

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Offline 01Thomas

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torque value conversions
« on: June 02, 2015, 12:13:08 PM »
Hi
I'm installing HD cylinder studs on my CB750 and the value for tightening the studs into the crankcase is 17 to 18 ft-pounds. My click-type torque-wrench is calibrated in inch-pounds.

I grew up in a metric environment, sooo... am I correct in thinking 17 ft-pds = 204 inch-pounds?

1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline PeWe

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Re: torque value conversions
« Reply #1 on: June 02, 2015, 12:23:50 PM »
You'll find conversion calculators on Internet. I convert ft lbs to Nm.  ft lbs vs Nm  on Google
The studs only should be tightened with 8 ft lbs. Head on torque about 22 ft lbs.
I torqued about 28Nm as final torque with a new and calibrated wrench.
Do not torque too much. HD studs are rigid and can snap if you torque too much... I have done it
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline flybox1

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Re: torque value conversions
« Reply #2 on: June 02, 2015, 12:26:53 PM »
12 inches in 1 foot :)
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline 01Thomas

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Re: torque value conversions
« Reply #3 on: June 02, 2015, 01:35:38 PM »
Hi Pewe

The instructions which came with the Kibblewhite HD studs clearly state "17 to 18 ft-lbs". Where does 8 ft-lbs come from?
See the attached PDF file.

regards
Thomas

You'll find conversion calculators on Internet. I convert ft lbs to Nm.  ft lbs vs Nm  on Google
The studs only should be tightened with 8 ft lbs. Head on torque about 22 ft lbs.
I torqued about 28Nm as final torque with a new and calibrated wrench.
Do not torque too much. HD studs are rigid and can snap if you torque too much... I have done it
1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline flybox1

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Re: torque value conversions
« Reply #4 on: June 02, 2015, 01:39:22 PM »
17-18ftlbs might remove your threads  :o
8ftlbs is standard for studs.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline calj737

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Re: torque value conversions
« Reply #5 on: June 02, 2015, 01:53:56 PM »
as Pewe said, the 18# is for the nut, the stud itself should only be 8#. That is a complete misprint and should be disregarded.
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline 01Thomas

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Re: torque value conversions
« Reply #6 on: June 02, 2015, 02:17:22 PM »
OK, I'll go with that. Thanks.
1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98