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07-08-2002, 01:10 AM | #1 |
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Bored & Stroked
What do these terms mean? i have heard of an engine being bored .0400 over or a "bored out v-8". But what does it mean? Also, what does it mean if it is a Stroked 302 or a stroker kit??? thanx for the help
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07-09-2002, 08:24 AM | #2 |
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Boring the motor is just like it sounds. It bores out the sides of the cylinder walls to make them bigger. Stroking it is just changing the stroke that the crank is making.
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1990 Mustang GT- 347 Stroker-Tremec 3550-Compucar Nitrous, AFR, Systemax Intake, AFM, 30lbers, 70MM TB, 76mm MAF, full suspension and lots more 1995 Chevy S-10 406 SBC, Dual tunnel ram, Dart heads, Nitrous, full tub, 4-link, adjustable drag shocks, coil-overs, 9in rearend, 4.56 gears...etc |
07-09-2002, 10:57 AM | #3 |
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What does the CI mean in your engine? cool indeed? just wondering
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07-09-2002, 11:05 AM | #4 |
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347 cubic inches..
I bored my motor out .30 over and stroked it out to a 347...
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1990 Mustang GT- 347 Stroker-Tremec 3550-Compucar Nitrous, AFR, Systemax Intake, AFM, 30lbers, 70MM TB, 76mm MAF, full suspension and lots more 1995 Chevy S-10 406 SBC, Dual tunnel ram, Dart heads, Nitrous, full tub, 4-link, adjustable drag shocks, coil-overs, 9in rearend, 4.56 gears...etc |
07-09-2002, 11:23 AM | #5 |
or '331 LX Eric'
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Smokedawg's 347 cu. in. motor would have been only 342 if he had not bored the cylinders to .030" over.
Likewise, my 331 cu. in. motor would have been only 327 had I not had mine bored .030" over. Obviously, in both cases, we had to get pistons that measure 4.030" to fit properly. The more you overbore the cylinders, the more displacement you get, however there is a point of diminishing returns when you bore too much and therefore loose strength in the cylinder/block walls. E
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1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60' |
07-11-2002, 05:06 PM | #6 | |
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Quote:
327ci+.030ci=330? why 331? |
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07-11-2002, 05:56 PM | #7 |
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because when you bore it out .030 over, you make the entire bore slightly bigger in diameter. Basically, with a 302, if you filled the cylinders up with water, then measured the amount it took to fill all 8 of them, you'd have 302 cubic inches of water. When you take .030 off the cylinder walls, then measure it again, it turns out to be 306 cubic inches. Does this make sence?
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1990 Notchback: BBK Ceramic Coated Full length headers, Dr. Gas 3"- 2 1/2" x-pipe, Flowmaster 40's/turndowns. |
07-11-2002, 06:53 PM | #8 |
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To figure an engine's displacement, the formula is:
pi / 4 x bore squared x stroke x # of cylinders Now, pi (3.1415927) divided by 4 equals .7853982, so the first part of the formula will always be .7853982: .7853982 x bore squared x stroke x # of cylinders Now, a 302 has a 4" bore, a 3" stroke, and 8 cylinders, so, by substituting those numbers, you get: .7853982 x 4 squared (16) x 3 x 8 or: .7853982 x 16 x 3 x 8 = 301.5929 cubic inches With me so far? Okay, now let's say you bore the engine .030" over, which means increasing the bore diameter of each cylinder to 4.030". Then the formula would look like this: .7853982 x 16.2409 x 3 x 8 = 306.13375 cubic inches. If you were to bore it .060" over, the formula would become: .7853982 x 16.4836 x 3 x 8 = 310.70853 cubic inches Get it? Take care, -Chris
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07-11-2002, 06:56 PM | #9 |
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By the way, to help put it into perspective for you, .030" is approximately as thick as 10 sheets of notebook paper.
Take care, -Chris
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07-11-2002, 09:46 PM | #10 | |
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Quote:
props for the 100% correct answer is there anything u dont know? lol peace
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1983 mustang, 393 cubic inch stroker small block, victor jr heads and intake, gold race 1.6 roller rockers. comp cam 304, 244@ .050. .576" hydralic retro roller cam,lunati rods. block was o-ringed,10:1 forged pistons, speed pro fit fit rings, clevite bearings,msd distributor and igniton,be cool huge radiator, black lite electric fan, march underdrive pulleys, mildon deep sump oil pan, mac 1 3.4" long tube headers, 3" dr gas x-pipe and mac exhaust,ARP bolts. car weighs 2900 lbs w/out driver, sub frames, weld wheels, mickey thompson sportsman pro 26 x 10.5 x 15's,#8 fuel line steel braided |
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