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› 0.5 mm Over-sized Piston - Rejet??
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0.5 mm Over-sized Piston - Rejet?? (Read 22 times)
LANCER
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Re: 0.5 mm Over-sized Piston - Rejet??
Reply #15 -
08/18/07 at 14:30:58
Savage_Rob wrote
on 12/31/69 at 16:00:08:
I didn't see any thoughts on this. I don't know if everyone just thought it was a stupid question or if they were studiously avoiding the topic. I mean, on a multi-cylinder engine it's less of an issue and it's virtually a non-issue as long as opposing cylinders are enlarged at the same time but I'm thinking the counterbalancer is designed with the stock displacement in mind. While it may be that small increases in displacement won't make an appreciable difference, wouldn't it follow that the engine would become less stable the more you alter the displacement?
Wouldn't the only real concern be if the replacement piston is the same weight as the stock piston?
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Re: 0.5 mm Over-sized Piston - Rejet??
Reply #16 -
08/18/07 at 16:11:56
would counterblancing be concerned with weight (of the piston) or mass? And functionally what would be the difference?
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Re: 0.5 mm Over-sized Piston - Rejet??
Reply #17 -
08/18/07 at 18:19:14
I think so. It is called a "counter-balancer", and that implies weight or mass is being compensated for.
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Savage_Rob
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Re: 0.5 mm Over-sized Piston - Rejet??
Reply #18 -
08/19/07 at 13:30:22
Maybe my emphasizing the word "displacement" was a poor choice in phrasing but I think the result is basically the same - a larger cylinder, with a larger piston inside it... and I'm thinking that most of the time a larger piston would have greater mass - assuming similar materials are used and it's shaped generally the same as the original. So now back to my question. Does this represent an appreciable difference in mass to which the issue of counterbalance should be addressed?
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1998|MAC muffler|ceramic coated header|K&N air filter|Amal Mk2 carb|Odyssey battery|iridium plug|NC windshield|Dunlop 491s|Superbrace|EBC brake rotor|12.5" Progressive shocks|Kuryakyn ISO grips
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LANCER
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Re: 0.5 mm Over-sized Piston - Rejet??
Reply #19 -
08/19/07 at 15:07:56
The Wiseco pistons do not list the weight, but they are forged pistons.
The Sudco book lists a 100mm forged piston for the DR650 at 375 grams.
The piston from my engine is roughly 405-410 grams (the scale is not perfectly accurate and could easily be +/- 5% ), which is 35 grams, or about 7% +/-weight difference.
That seems like a significant amount.
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T Mack 1 - FSO
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Re: 0.5 mm Over-sized Piston - Rejet??
Reply #20 -
08/19/07 at 20:51:01
First, you could reduce weight by making a billet connecting rod. Vertical moving weight would be less. Would need some thinking on which alloy would be stong enough.
Second, Went for a 40 mile ride yesterday, back rode and freeway driving ( found out they re-grooved about a mile of the expressway not too long ago (I-78). Well, at the end of the trip about a half mile from home, it started to buck a little. Got home and checked the spark plug. Solid black.
Apart it comes again. .........
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Engineers design things, Technicians make them work.
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30% of being mechanical is confidence/30% is knowing to go slow when needed/30% is looking repeatedly at what you have/10% is dumb luck
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Re: 0.5 mm Over-sized Piston - Rejet??
Reply #21 -
08/20/07 at 04:23:34
Will the larger but slightly lighter in weight piston really cause any problem? I think it would be a better situation.
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