Torque on aluminum rod bolts

[oldandtired]

I have a set of BBC Brooks rods and need to know if I should torque the bolt to 75 ft lbs (as per ARP w/Moly) or use my angle gauge.
I cannot use my bolt stretch gauge as there is insuffient room in the rod to insert the pin.

7/16 x 1.800 UHL, 8740 chrome moly @ 190,000
Brooks 65 series rods

Thanks in advance, Dave

[CamBirdRacing]

I wouldn't think that much. Most are around 45 b/c it will pull the threads in the rod. Probably need to call the rod manuf and ask them.

[desoto30]

IIRC when I used BRC alloy rods with 7/16" bolts (not sure UHL) I used to torque them to 65 ft lbs using engine oil as lube.This was before the advent of stretch guages.

[TS1955]

I've got a set of Childs & Alberts aluminum rods in a BBC with 7/16 bolts. They are torqued to 65 ft lbs with oil.

TS1955

[oldandtired]

I finally found the number to Brooks tech line. The torque is indeed 75 ft lbs, but desoto30 and TS1955 were correct with the oil statement, (no moly is used for alunimum).

75 oil would be equal to 55-65 moly for a steel application.
Thanks to all... Learned something today.
Dave

[zipper06]

I finally found the number to Brooks tech line. The torque is indeed 75 ft lbs, but desoto30 and TS1955 were correct with the oil statement, (no moly is used for alunimum).

75 oil would be equal to 55-65 moly for a steel application.
Thanks to all... Learned something today.
Dave

What are you saying, i also have a set of sm/blk C&A rods and was also wondering how much to torque them. Are you saying that brooks said don't use moly, just use oil, are you saying if you use moly on the alum rods the torque value woule be less, or don't use moly at all. I also need to know.

Thanks.

Zip.

[phoenix1]

i have 65 series Brooks also and they advise motor oil only on the thread.The torque setting is dictated by the colur of the washer.

[oldandtired]

I finally found the number to Brooks tech line. The torque is indeed 75 ft lbs, but desoto30 and TS1955 were correct with the oil statement, (no moly is used for alunimum).

75 oil would be equal to 55-65 moly for a steel application.
Thanks to all... Learned something today.
Dave

What are you saying, i also have a set of sm/blk C&A rods and was also wondering how much to torque them. Are you saying that brooks said don't use moly, just use oil, are you saying if you use moly on the alum rods the torque value woule be less, or don't use moly at all. I also need to know.

Thanks.

Zip.

Zip, Brooks said not to use anything but oil on rod bolts for aluminum rods. Most capscrews for aluminum rods have 2 x bolt diameter for thread engaugement, much more than a steel rod capscrew. I am thinking that moly is too slick or if there is a chemical or galvanic corrosion possibility. NO MOLY! Perhapse some of our chemist friends can chime in.
Dave

[oldandtired]

i have 65 series Brooks also and they advise motor oil only on the thread.The torque setting is dictated by the colur of the washer.

Phoenix, Do you have the color code?
The first think they asked me was my washer color (silver).
Thanks, Dave

[phoenix1]

hi sorry about the delay in getting back but the washer is the key and silver is 75 ft/lb and the black is 90ft/lb.They are tensioned in three steps using motor oil only. The contact at brooks is Jerry Sweeeney and he is very helpful. Their number is 7147783315

[oldandtired]

hi sorry about the delay in getting back but the washer is the key and silver is 75 ft/lb and the black is 90ft/lb.They are tensioned in three steps using motor oil only. The contact at brooks is Jerry Sweeeney and he is very helpful. Their number is 7147783315

That means I have the 190,000 psi 8740 Chrome Moly. The black washer would be an upgrade to 220,000 psi (probably Inconel 718).

Thanks, data added to file. Dave