Ok got the complete thread printed out. I will go over it in the next couple of days and check what i think should go into the new thread. if i miss anything just let me know. should i get the thread locked or leave it open for everybody?

Laterz Brian

 

Alright since nobody has answered me in "performance mods..." category i thought Id ask here. I wanted to know about boring out a quad. What does making the bore .020 over do to the cc's? for a 230 (229 accually), what would the cc's be for 1 bored .060 over? Ive herd people say, "250cc, bored .020 over makes it a 270cc. I dont believe that. Can someone answer this?

 

Well I do not have the stock specs for the LT handy, however the cc size of an engine is it's volume in cubic centimeters. to get this you take your bore which will be in square centimeters, so you will need to find the area of the circle, times the stroke in centimeters. If it is .o60" over, that would translate into .1524 cm. Add that to the stock bore size before you multiply to get the area.

 

alright i think i understand. stock bore is around 66cm or something like that im not sure.

 

What is the stock stroke length?

 

im not sure on either of them but i thought they were really close to each other like 66 bore 67 stroke or somewhere around there, or maybe im way off, i havent looked at the manual lately.

 

Swartzy, your spot on the stock numbers, just got the units wrong. The bore of the sport is 66mm and the stroke is 67mm. (Or 6.6cm and 6.7cm respectively.)

To calc the stock cubic displacement, it's area of the cylinder times the stroke. The area is calculated as PI*radius^2 where radius = 1/2 diameter, or 1/2 bore.

So the stock displacement in centimeters is 3.14159*[(6.6/2)^2]*6.7 = 229.22 cubic centimeter displacement (CCD).

In inches, the stock displacement is 3.14159*[(2.598/2)^2]*2.638 = 14.0 cubic inch displacement (CID).

1 inch = approx 2.54 cm. To convert back to CCD, simply multipy the CID by 2.54^3.

Increasing the bore by .020 (20 thousandths of an inch which is referred to as "20 over"), the formula is now 3.14159*[(2.618/2)^2]*2.638 = 14.2 cubic inches. This equates to 232.7 CCD.

Increasing the bore by .060 inches (60 over), the formula is now 3.14159*[(2.658/2)^2]*2.638 = 14.64 cubic inches. This equates to 239.9 CCD.

As you can see, boring the cylinder 20 over doesn't make as much difference as one would think. You start with a 229 and end up with a 233. Going 60 over means moving up to a 240.

The longer your stroke, the more CC's you gain from boring the cylinder.

 

posted pics of my beast on my gallery


check em out its not as nice as most on here but it runs better than it looks

 

ROTFLMAO I absolutely love the picture of

LOU GOIN RIDING. now that is the best way i have ever seen to transport a quad..

MODS SORRY FOR THE OT...

 

i posted some pics don't know when they will be ready