Counterweighted crank

What bob weight is the counter weights engineered for.welds still ugly aas ever.its amazing how much work a person will do who xoesnt understand four inline cylinder balancing .

Edited by mlpankey - 18 Feb 2013 at 6:26pm

didn't take long for the local clown to speak up 

If a guy wants to make a 4 cylinder crank with the journals less than. 180 degrees apart then he needs counterweights.talking about a timing nightmare.

Edited by mlpankey - 18 Feb 2013 at 6:45pm

Yet another who doesnt understand balancing a four cylinder and trying to apply rules for a 90 degree v8 to a 180 degree 4 banger. I see why so many superstockers buy engines to run
Before you go to a snake oil salesman cause youve got to have one research this. 4 cylinder cranks are mechanically balanced by the two opposing pistons. The only way they arent balanced is in high rpms causing second imbalanes issues. Automotive engineers realised this and also realized that counterweights did nothing for this second imbalance and engineered balance shafts to counteract second imbalnce

Edited by mlpankey - 18 Feb 2013 at 7:15pm

What 4 cylinder crank has a number 5 cylinder spanky get some glasses and find the shut up button on you or computer wi nice work keep the info coming

All you bench racing boys should at least read wikepedia . a inline six cylinder is in mechanical balance and counteracts second imbalance by its design of cylinder arrangement. snakeoil salesman work hard to impress the shade tree farm mechanics. Its your farm money spend it how you choose .  

Edited by mlpankey - 18 Feb 2013 at 8:43pm

Spunkster, why don't you explain to us why a 426 AC crank has no counterweight? Why a JD has weights on all and why an IH 400 series has weights on 4 of the 6 cylinders? Of the 3 why is the non weighted AC crank the most likely to fail? Cummins and Cat are weighted.

Or better yet why pullers need to add the weights for durability?

Suppose this thread is going to turn into the same thing as the connecting rod thread, 10 pages of BS

Rod B wrote: Spunkster, why don't you explain to us why a 426 AC crank has no counterweight? Why a JD has weights on all and why an IH 400 series has weights on 4 of the 6 cylinders? Of the 3 why is the non weighted AC crank the most likely to fail? Cummins and Cat are weighted. Or better yet why pullers need to add the weights for durability?

I havent researched it thoroughly but my start on research would be on if there was any difference in firing orders of differing brands of engines to crank design. firing order can change torsional loads and lessen vibration

Rod B wrote: Good luck pank. You can make something up, but the fireing order and crank layout all have something in common. Waste your time though, better than trying to pollute this forum. Speaking of bench racers I opened up my copy of The Puller magazine. You know the one, the national magazine from NTPA. WI50's picture in there a couple times on the podium for state and regional points. I squinted and didn't see yours pank.

They are already extensive research and findings on gas firing orders l6 engines. The question would be is this a diesel or a converted to alky  . If plans are for alky then camshaft firing order would be the equalizer for second imblalance vibrations

mlpankey wrote: Rod B wrote: Spunkster, why don't you explain to us why a 426 AC crank has no counterweight? Why a JD has weights on all and why an IH 400 series has weights on 4 of the 6 cylinders? Of the 3 why is the non weighted AC crank the most likely to fail? Cummins and Cat are weighted. Or better yet why pullers need to add the weights for durability? I havent researched it thoroughly but my start on research would be on if there was any difference in firing orders of differing brands of engines to crank design. firing order can change torsional loads and lessen vibration

Pank stated that us bench pullers need to read wikiopedia more often...Look stupid, dont you know that ANYONE can edit Wikipedia? Why dont you go over there and try to look smart. Its not cutting it here anymore..You are the kind of guy who likes to spread his BS...there is your chance.   Man Im glad BK has the internet...knocking panks dick in the dirt...best lunch break all week..

Rod B wrote: Spunkster, why don't you explain to us why a 426 AC crank has no counterweight? Why a JD has weights on all and why an IH 400 series has weights on 4 of the 6 cylinders? Of the 3 why is the non weighted AC crank the most likely to fail? Cummins and Cat are weighted. Or better yet why pullers need to add the weights for durability?

mlpankey wrote: wi50 wrote: Rod B wrote: Spunkster, why don't you explain to us why a 426 AC crank has no counterweight? Why a JD has weights on all and why an IH 400 series has weights on 4 of the 6 cylinders? Of the 3 why is the non weighted AC crank the most likely to fail? Cummins and Cat are weighted. Or better yet why pullers need to add the weights for durability? <FONT>  <FONT>  <FONT>  Well I'm not the spunkster, he can't answer and at least admitted it this time before makeing up some bs.  The non weighted ones fail the most..... the rest of the block is just plain strong enough to transfer the loads.  It's "forced" into being balanced, somewhere down the line on the crank.   But the weighted cranks help, the load is transfered across the crank rather than to another cylinder somewhere down the line.    If you look at some cranks that are weighted on all the cylinders, the weights oppose the crankpin by180*.  The ones weiighted on 4 of the 6 cylinders have the weights clocked slightly off on some of the crankpins, some of the weights are 180* off the crankpin and some are clocked differently.  1 weight of the pair for one cylinder will be 180* off and the other weight for that cylinder will be clocked to help the non weighted cylinders on those cranks.   Spankey can look at the fireing orders, but it doesn't make any difference.  Gas, diesel, same difference.   Additional weight is added on these high RPM pulling cranks to hopefully completly nutralize the rod and piston unit, on each throw with minimal transfer elsewhere in the rotating assembly.  It's got enough stress on it.    Stock cranks will run up pretty fast but will eventually throw themselves apart,  we all know that.  Weighted ones will run faster, and ones with all cylinders counterweighted and added weights will run untill the lifters spit out the block or the rod bolts pull.   Wild, Bill, just plain stock main caps in the block, decked and a 1" thick alumnium girdle with a block between the girdle and plate.  you need to research the firing order a little more .

I'd love to learn how firing order effects the balance of a rotating mass. Please explain using proper spelling. punctuation, and grammar so all can understand without having to decipher your gibberish.   -Oh please cite your sources; and don't use Wikipedia, professors hated that.

Thanks Marty.. Was only wondering with the rotating mass change if a person was to 4 bolt front and rear main caps ? But yes a girdle tied into it would make sense. Thanks.