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#1
11-10-2021, 12:46 PM
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Crankshaft balancing
I have a NEW eagle crank for my 455. My sons just got done doing all the rods, pistons...stuff. So here is the $300 QUESTION.
Eagle states the intended bobwieght for the crank is 2280 g. MY bobweight figures at 2284 g. Is the .1% UNDERBALANCE an issue for a 5500 rpm engine? This is OUTSIDE MY knowledge base. I will have the crank set up regardless...to see WHAT the crank is at. 2280 is the TARGET from Eagle not the exact number achieved. |
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#2
11-10-2021, 03:18 PM
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You are close enough to run it as is if you trust Eagle's number.
Do you want to send me a check or PayPal 
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| The Following User Says Thank You to PAUL K For This Useful Post: | ||
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#3
11-10-2021, 04:56 PM
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also in my calcs....measurements were done on a LEVEL surface plate with a height gage /indicator per ID ....my big end + small end = +/- .5 gram of total rod weight. so I feel good about my bobwieght. Cprrection 2285 not 2284 but I will leave it to the "shop hand" who des this to determine if ti is within "margin"of error" etc.....it will still be spun up and measured..... just curious what is the "margin of acceptable error" on a simple 5500 rpm motor?..... I do realize 8500 rpm is DIFFERENT...so chime in please.
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#4
11-10-2021, 05:44 PM
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While Joe at Moldex can get a lot closer, to the exact bob weight, the 3 speed shops I worked for were willing to run it with a 3 gram difference on the Bob Weight.
Their opinion was oil was constantly splashing on the rotating parts and it was never going to be the same as a "dry" Crankshaft Assy in actual use. Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#5
11-10-2021, 06:32 PM
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Your fine with that small a difference!
__________________
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! |
| The Following User Says Thank You to steve25 For This Useful Post: | ||
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#6
11-11-2021, 08:19 AM
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cool...I figured it would be a "builders call". Now we just gotta see WHAT the crank actually is.
Thanks. |
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