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Originally posted by: DuneMe
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The 703mm is a stock jug that is bored to 102mm and re niked. I don't think the cylinder height is any different.


I thought the 102mm bore is a 680!? That's what I heard from everyone.. Or are you talking about that bore and a stroke too?
[img]i/expressions/face-icon-small-confused.gif[/img]

 

703 is a 102mm bore with a 3mm stroke (I think.)

What I was trying to say is the jug for a 703 isn't a special casting that Pami does. It is the stock jug bored and then a stroke also.

 

K thanks.

 

No need to use spacers and all that crazy stuff. I would just shorten the rod a little or order my pistons with the pin location moved up etc. I think the best way would be to shorten the rod then any stock bore guy could use it or the 720 bikes could also use it making them about 783cc. All the friction talk is slightly true but the advantage of more leverage against the crank by stroking always out weighs the small amount of friction increase. If the crank is stroked 7mm then the rod would have to be shortened 3.5mm which would barely be noticable to the naked eye. This gives a 1.52:1 rod ratio which is the same as a small block chevy using the 3.75 crank and 5.7 rod, there's a pile of them running in drag cars.



MrHorsepower

 

[img]i/expressions/face-icon-small-wink.gif[/img][img]i/expressions/face-icon-small-smile.gif[/img]

 

well this thread turned interesting[img]i/expressions/face-icon-small-smile.gif[/img]

 

Haven't you guy figured out how to build torque yet? Long rod , short rod, it don't matter.


Torque in a bottle! NOS [img]i/expressions/face-icon-small-smile.gif[/img]

J Ross

 

I agree! All of these ratios, deck heights, crank pin location, etc. is getting me confused! LOL

 

SO does anyone know WHEN,WHERE ,HOW MUCH you can get a "stroker" crank pin for the DS????








Bigger.

 

I'ld try Crank Works or Pami for the stroked pin. Don't know how much.