This may be a noob question????
10-25-2010, 09:49 PM
#1
This may be a noob question????
Why does it always seem that the crank pin always wears before the brass in the connecting rod? The cranks made out of steel, and the con rod is made out of aluminum w/ brass inserts........ Just blows my mind! Is there a reason for this? I'm very mechanically inclined, and I just don't understand it! 
10-25-2010, 09:53 PM
#2
Why does it always seem that the crank pin always wears before the brass in the connecting rod? The cranks made out of steel, and the con rod is made out of aluminum w/ brass inserts........ Just blows my mind! Is there a reason for this? I'm very mechanically inclined, and I just don't understand it!
it normally doesent! you must be running OS motors.......LOL
10-25-2010, 10:13 PM
#5
10-25-2010, 10:17 PM
#6
Well I had the GO and it developed a little slop, so I pulled the the engine apart and put a new rod in and the slop was still there! So I pulled the crank out and mic'd it and it was fatter at the base of the pin and thinner at the tip, so I bought a new crank and the old rod fit nice and snug like it was a brand new engine! Just couldn't believe it! both the GO and reedy were used motors so who knows how they were broke in. Every motor I've broke in has not had any issues. Just wondering if this was a common thing or just flukes! I have heard OS having an issue with crank pins, but so far my speed is good!
10-25-2010, 11:50 PM
#7
The answer is simple, steel may be harder (although some are realy soft) but the brass ring in the rod has the lowest friction of them 2 and itst hardness is making the difference which one will wears faster.
10-26-2010, 01:03 AM
#8
10-26-2010, 05:04 PM
#9
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Quality of the metal.
10-26-2010, 05:43 PM
#10
This is ridiculous. I understand the stress that the connecting rod is under during break in. I understand how nice it would be to replace it after break in. I feel engine manufactures should include a new rod for free or they shouldn't be 40 to 60 bucks for a part that cost 25 cents to make!
10-26-2010, 07:30 PM
#11
This is ridiculous. I understand the stress that the connecting rod is under during break in. I understand how nice it would be to replace it after break in. I feel engine manufactures should include a new rod for free or they shouldn't be 40 to 60 bucks for a part that cost 25 cents to make!
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