Engin Balancing Question?
#1
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Engin Balancing Question?
I picked up my short block yesterday and they gave me the balance sheet. I have no clue what it means, if this is good or bad. The sheet say balanced in HINES MICROCOMPUTER Balancer. Here is the info:
RODS Big End- 574
INSERT- 44
TOTAL= 615
TIMES RODS/THROW x2 1230
OIL- 4
ROTATING WEIGHT- 1234
PISTONS- 598
PINS- 151
LOCKS- 5
RINGS- 70
RODS SMALL END- 225
TOTAL RECIROCATING- 1049
RECIPROCATING FACTOR- 1049
JOB WEIGHT- 2283
RODS Big End- 574
INSERT- 44
TOTAL= 615
TIMES RODS/THROW x2 1230
OIL- 4
ROTATING WEIGHT- 1234
PISTONS- 598
PINS- 151
LOCKS- 5
RINGS- 70
RODS SMALL END- 225
TOTAL RECIROCATING- 1049
RECIPROCATING FACTOR- 1049
JOB WEIGHT- 2283
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Re: Engin Balancing Question?
That is information that he needs to determine the size of the bob weights to attach to the crank while he spins it up... those are the weights of the pieces in grams. Your pistons weigh 598 grams each... the wrist pin is 151 etc etc... V-8's use the pistons, wrist pins, and connecting rods as part of the counterweight for the opposing cylinder. 90 degree V-8's have a "perfect" primary balance and an even firing order with a power pulse every 90 degrees of crankshaft rotation. There are small "secondary" imbalances that become "buzzing"....Whereas an inline 6 doesn't need bob-weights on the crank when it is spun up to test for the balance. Does that answer your question?
#4
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Re: Engin Balancing Question?
Originally Posted by Reed Jensen
90 degree V-8's have a "perfect" primary balance and an even firing order with a power pulse every 90 degrees of crankshaft rotation. There are small "secondary" imbalances that become "buzzing"....Whereas an inline 6 doesn't need bob-weights on the crank when it is spun up to test for the balance. Does that answer your question?
Michael
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Re: Engin Balancing Question?
The Easiest Way To Interpret This Paper Work Is To Determine The Weight Of Your Components We Also Provide Our Customers With That Type Of Paper Work This Becomes Handy Any Time You Need To Replace Any Internal Parts And Its Also Information Needed During The Balancing Process . All V Type Engines Require Bob Weights For Balancing The Only Thing That Changes Are The Reciprocating Factor In Different Angle Engines The Only Engines That Do Not Require Bob Weights Are In Line Engines And Rare 180 Degree Crankshaft Engines Used In Ferrari And Also Very Common In Sprint Car And Drag Boat Applications And I Still Take The Time To Make Up The Weights To Get The Balance Perfect In Them Because Those Engines Are Very Hard On Main Bearings. Hope That Answers Your Question Easier Laz Mesa
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Re: Engin Balancing Question?
Originally Posted by Michael1
Reed, I think you have this backwards. A 90 degree V8 with 90 degree crank pins between pairs of cylinders is unbalanced in the primary mode, and is balanced in the secondary mode. That's why you are able to balance it with weights on the crank. The balancing done is to cancel out the rotating primary couple (rocking force), so the weights are set opposite to each other at the two ends of the crank. As you mentioned, the inline 6 is balanced in both primary and secondard modes.
Michael
Michael
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Re: Engin Balancing Question?
Originally Posted by MESA BALANCING
The Easiest Way To Interpret This Paper Work Is To Determine The Weight Of Your Components We Also Provide Our Customers With That Type Of Paper Work This Becomes Handy Any Time You Need To Replace Any Internal Parts And Its Also Information Needed During The Balancing Process . All V Type Engines Require Bob Weights For Balancing The Only Thing That Changes Are The Reciprocating Factor In Different Angle Engines The Only Engines That Do Not Require Bob Weights Are In Line Engines And Rare 180 Degree Crankshaft Engines Used In Ferrari And Also Very Common In Sprint Car And Drag Boat Applications And I Still Take The Time To Make Up The Weights To Get The Balance Perfect In Them Because Those Engines Are Very Hard On Main Bearings. Hope That Answers Your Question Easier Laz Mesa
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Re: Engin Balancing Question?
Chris is that a short block from Dyno flow?
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Re: Engin Balancing Question?
Originally Posted by dyno
Chris is that a short block from Dyno flow?
#10
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Re: Engin Balancing Question?
so what did you buy? I've been looking at there stuff for a couple of years but was waiting for someone else to take the plunge....guess your it!Lets here about your combination heads,intake...????are you going to dyno it?did you check any of the clearances? I think I'd have to grab some plastigage and check a few before I threw the pan on.
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If your boat has a sail do you ride a horse to the ramp?
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