wut is stroking?
03-15-2007, 08:09 PM
#6
5th Gear Member
Join Date: Nov 2004
Location: Texas
Posts: 3,834
RE: wut is stroking?
At least there are knowledgable people in here to help you....lol.[&:]
Stroking a motor increases the displacement. A 5.0 HO is a 302....4" cylinder bore X 3" rod length. You can stroke a motor using 3.25" rods or 3.4" rods (<--most common). If you keep the stock cylinder bore of 4" and add a 3.25" rod, you now have a 327" motor instead of 302. If add a 3.4" rod, you have a 342ci motor. If you bore the cylinder .030 over (making the bore 4.030") and add a 3.25" rod, you have a 331; or a 347 w/ a 3.4" rod.
As a side note: Shorter rods often allow you to (more dependibly) rev higher. Longer rods mean the pistons are traveling at much faster speeds at higher rpms and can cause a longer rod motor to wear out sooner. That doesn't mean a 347 won't last you 100k miles, it just means that a 331 driven under the same conditions as a 347 would probably outlast the 347.
W/ the new Boss 302 block, Ford says it can be bored up to a 4.125" diameter, meaning you could use a 331 stroker kit (w/ larger diameter pistons, obviously) and have a displacement larger than 347 using shorter rods.......
Stroking a motor increases the displacement. A 5.0 HO is a 302....4" cylinder bore X 3" rod length. You can stroke a motor using 3.25" rods or 3.4" rods (<--most common). If you keep the stock cylinder bore of 4" and add a 3.25" rod, you now have a 327" motor instead of 302. If add a 3.4" rod, you have a 342ci motor. If you bore the cylinder .030 over (making the bore 4.030") and add a 3.25" rod, you have a 331; or a 347 w/ a 3.4" rod.
As a side note: Shorter rods often allow you to (more dependibly) rev higher. Longer rods mean the pistons are traveling at much faster speeds at higher rpms and can cause a longer rod motor to wear out sooner. That doesn't mean a 347 won't last you 100k miles, it just means that a 331 driven under the same conditions as a 347 would probably outlast the 347.
W/ the new Boss 302 block, Ford says it can be bored up to a 4.125" diameter, meaning you could use a 331 stroker kit (w/ larger diameter pistons, obviously) and have a displacement larger than 347 using shorter rods.......
03-15-2007, 08:55 PM
#9
6th Gear Member
Join Date: Dec 2006
Location: Citrus County, FL
Posts: 8,007
RE: wut is stroking?
Stroking a motor increases the displacement. A 5.0 HO is a 302....4" cylinder bore X 3" rod length. You can stroke a motor using 3.25" rods or 3.4" rods (<--most common). If you keep the stock cylinder bore of 4" and add a 3.25" rod, you now have a 327" motor instead of 302. If add a 3.4" rod, you have a 342ci motor. If you bore the cylinder .030 over (making the bore 4.030") and add a 3.25" rod, you have a 331; or a 347 w/ a 3.4" rod.
having your block bored .060 instead of .030 has nothing to do with rod length or stroke, but a larger diameter bore will yield a higher cubic inch displacement with any given stroke
03-15-2007, 10:21 PM
#10
4th Gear Member
Join Date: Oct 2006
Location:
Posts: 1,826
RE: wut is stroking?
http://www.fordmuscle.com/archives/2003/09/stroker/
this might help
you're confusing the bore and the stroke. the bore is how big around the cylinder is. think of looking at a pop can from the top; to make the top of the can bigger is increasing the bore. to make the can taller would be to increase the stroke. both increase the volume in different ways. as a side note, you dont bore a motor to gain displacement. a motor is bored to get a "new" cylindre wall to work with.
you should check that .060 over motor pretty well, as it may have overheating issues.
this might help
you're confusing the bore and the stroke. the bore is how big around the cylinder is. think of looking at a pop can from the top; to make the top of the can bigger is increasing the bore. to make the can taller would be to increase the stroke. both increase the volume in different ways. as a side note, you dont bore a motor to gain displacement. a motor is bored to get a "new" cylindre wall to work with.
you should check that .060 over motor pretty well, as it may have overheating issues.