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#1
04-24-2019, 02:15 PM
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rpm LG5-6625I rod torque
What torque do you use on a rpm LG5-6625I (5140) rod? My instruction sheet lists 7/16" ARP 8740 60 lb ft and 7/16" WAVE 8740 75 lb ft. What is WAVE?
RPM website says ARP 8740 thru-bolts. The fastener head is stamped ARP a dot. Threaded diameter is 7/16" and cap nut takes a 5/8" socket. bt
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#2
04-25-2019, 01:11 AM
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IIRC, when my rotating assembly with 5140 rods was balanced, the machinist torqued to rod bolt stretch specs, and that came out to something like 77 ft lbs. So I think 75 should be good.
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#3
04-25-2019, 06:17 AM
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Wave refere's to the contour of the side of the rod bolt below the bolt head that resides in the big end of the rod.
A wave type bolt keeps the bolt centered better in the big ends bolt holes. You do not want to mess around with this, you want get the correct stretch for the type of bolt you have! Also keep in mind that down the road after the rod bolts have been turqued up 4 times you want to replace and resize the rod's even if the bolt come up to the needed torque / stretch spec's evenly in the way that the should. A bolt that when torquing all of a sudden comes up to torque fast in the last 1/4 turn of motion is a failure in the works! Your bolts currently where torqued up once when they where made, once again when the builder was checking clearances , and now by you a 3rd time putting the motor together.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 04-25-2019 at 06:23 AM. |
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#4
04-25-2019, 12:07 PM
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Thanks for the info. I always like getting your input since you have more experience than I do. Next comes checking rod clearances. bt
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