Rebalance b16 crank
Honda-Tech Member
Joined: Feb 2001
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From: Northern, VA
Re: (YASH)
It's a good idea to get the crank balanced, regardless of the weight of the internals. If the crank hasn't been balanced before, and you're rebuilding your block, it's probably a good idea to just have it balanced.
-Mike
-Mike
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Joined: Dec 2003
Posts: 341
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From: Sweden
Re: (SlowTeg)
What is the balancefactor of a stock b16 engine. I mean how well is it balanced?
I know that it is less than 1g between the different cylinders, cuz i weight my stock internals, but how are they compared to the crank stock?
I know that it is less than 1g between the different cylinders, cuz i weight my stock internals, but how are they compared to the crank stock?
Re: (YASH)
This is what I've been told about balancing inline four crankshafts and piston/rod assy's.
The crank gets balanced by itself on the balancer machine that spins the crank anywhere from 500rpm to 1000rpm. No bobweights needed. I'm not sure what a good out of balance limit is, but you want it to be as close to 0 grams as possible on the balance machine.
The opposing throws (1&4, 2&3) counter-balance each other, so the masses of cyl's 1+4 = cyl's 2+3. The easiest way to do it is to take the total mass of all the piston/rod assy's: piston, piston rings, wrist pin, rod, rod bearings, rod fasteners, and match the other three to the lightest one.
The one thing I'm not sure about now is how much the rotational mass-end of the conrod affects the balance of the crankshaft. I believe they should also be equalized, but I'm still waiting for more experienced advice on that.
BTW, the crankshaft pulley and flywheel should also be neutral balanced on their own, then mounted onto the crankshaft, one at a time, for the entire assy to be rechecked.
The crank gets balanced by itself on the balancer machine that spins the crank anywhere from 500rpm to 1000rpm. No bobweights needed. I'm not sure what a good out of balance limit is, but you want it to be as close to 0 grams as possible on the balance machine.
The opposing throws (1&4, 2&3) counter-balance each other, so the masses of cyl's 1+4 = cyl's 2+3. The easiest way to do it is to take the total mass of all the piston/rod assy's: piston, piston rings, wrist pin, rod, rod bearings, rod fasteners, and match the other three to the lightest one.
The one thing I'm not sure about now is how much the rotational mass-end of the conrod affects the balance of the crankshaft. I believe they should also be equalized, but I'm still waiting for more experienced advice on that.
BTW, the crankshaft pulley and flywheel should also be neutral balanced on their own, then mounted onto the crankshaft, one at a time, for the entire assy to be rechecked.
Joined: Oct 2000
Posts: 4,440
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From: Surrey, BC, Canada
Re: (IN VTEC)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IN VTEC »</TD></TR><TR><TD CLASS="quote">The one thing I'm not sure about now is how much the rotational mass-end of the conrod affects the balance of the crankshaft. I believe they should also be equalized, but I'm still waiting for more experienced advice on that.</TD></TR></TABLE>
I would believe that as long as the rods are equally weighted end-end and have overall equal weights, the crank will be balanced when they're bolted in place by default.
I would believe that as long as the rods are equally weighted end-end and have overall equal weights, the crank will be balanced when they're bolted in place by default.
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