How do you calculate the CC's of an engine that's been bored over. My cylinder is be bored to accept a 86.00mm piston (4th over) running on a stock crank. I was just curious as to the CC's of the engine.
How do you calculate the CC's of an engine that's been bored over. My cylinder is be bored to accept a 86.00mm piston (4th over) running on a stock crank. I was just curious as to the CC's of the engine.
2000 KTM 300 EXC (two stroke heaven)
1999 Honda 400EX
Bored to a 406
Lonestar carrier
CRF450 timing chain
1994 Suzuki 250F
That would be a 402cc
2000 Honda TRX400EX ( MX Setup )
2006 Suzuki LTR450 ( Stock )
1986 Suzuki LT-250R ( Stock )
2001 Kawasaki KX250 ( MX Setup )
2004 Kawasaki KX85 ( Playin Bike )
199? Yamaha PW80 ( Pit Bike )
2003 Polaris Trail Boss 330
1996 Kawasaki Bayou 220
Proud owner of more than 38 internal combustion engines!!!
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86mm piston is a 406, gotta remember the engine itself is designated 400cc but in reality is 397cc.Originally posted by trailrider894
That would be a 402cc
If it's stupid, and it works, it isn't stupid. - Murphy's Law
2000 426EX,sold
2004 450R WIP
-Longtime A.A.D.S. (Accessory Acquisition Disorder Syndrome) sufferer.
400EX Frequently Asked Questions, CHECK HERE FIRST!
86.5MM is 406cc. From my understanding... on how i did the math.Originally posted by CJM
86mm piston is a 406, gotta remember the engine itself is designated 400cc but in reality is 387cc.
Standard bore- 397cc or 85mm
402cc- .040 over or 86mm
406cc- .060 ever or 86.5mm
416cc- .080 over or 87mm
426cc- .120 over or 88mm
440cc- .160 over or 89mm
also...
440cc with an extra 4mm stroke = 460cc
416cc with an extra 4mm stroke = 440cc
2000 Honda TRX400EX ( MX Setup )
2006 Suzuki LTR450 ( Stock )
1986 Suzuki LT-250R ( Stock )
2001 Kawasaki KX250 ( MX Setup )
2004 Kawasaki KX85 ( Playin Bike )
199? Yamaha PW80 ( Pit Bike )
2003 Polaris Trail Boss 330
1996 Kawasaki Bayou 220
Proud owner of more than 38 internal combustion engines!!!
Support our troops and we will support you!!! HOOAH!!!
Assist, Protect, Defend!!! Military Police!!
Right off wisecos site:
85.5 is 402
86 is 407 (406 depends on which piston maker)
If it's stupid, and it works, it isn't stupid. - Murphy's Law
2000 426EX,sold
2004 450R WIP
-Longtime A.A.D.S. (Accessory Acquisition Disorder Syndrome) sufferer.
400EX Frequently Asked Questions, CHECK HERE FIRST!
The formula and math is as follows...
pi (1/2 bore) ^2 * stroke
or to make it easier...
Pi X R X R (R squared) X H
I'll do it for the 400ex
So get the bore in cm, divide by 2. 86mm = 8.6cm, /2 = 4.3 square it, = 18.49, times Pi, 18.49 X 3.14159 = 58.08
58.08 X stroke in cm, 58.08 X 7.0 = 406.56cc's
The math says a stock stroke with an 86mm piston is 406.
Hmmm... thanks guys. Not sure how the site i got that from was wrong. Thanks for the new knowledge!!!Originally posted by rubbersdown
The formula and math is as follows...
pi (1/2 bore) ^2 * stroke
or to make it easier...
Pi X R X R (R squared) X H
I'll do it for the 400ex
So get the bore in cm, divide by 2. 86mm = 8.6cm, /2 = 4.3 square it, = 18.49, times Pi, 18.49 X 3.14159 = 58.08
58.08 X stroke in cm, 58.08 X 7.0 = 406.56cc's
The math says a stock stroke with an 86mm piston is 406.
2000 Honda TRX400EX ( MX Setup )
2006 Suzuki LTR450 ( Stock )
1986 Suzuki LT-250R ( Stock )
2001 Kawasaki KX250 ( MX Setup )
2004 Kawasaki KX85 ( Playin Bike )
199? Yamaha PW80 ( Pit Bike )
2003 Polaris Trail Boss 330
1996 Kawasaki Bayou 220
Proud owner of more than 38 internal combustion engines!!!
Support our troops and we will support you!!! HOOAH!!!
Assist, Protect, Defend!!! Military Police!!
Thanks guys. I appreciate the lesson.
2000 KTM 300 EXC (two stroke heaven)
1999 Honda 400EX
Bored to a 406
Lonestar carrier
CRF450 timing chain
1994 Suzuki 250F