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06-11-2014, 01:18 AM | #1 |
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Understanding bore and stroke
There is a discussion on VBA's fb page about the Thunder Manufacturing bore kit. Can someone shed some light on why someone would choose to bore out a 1500 engine vs getting a 1600 which, from my understanding, is all the same, but with a longer stroke. Seems like with the rpm restrictions a longer stroke would produce more power, right?
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06-11-2014, 08:05 AM | #2 |
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Because increasing the bore is the easiest way, to increase the stroke a different crankshaft is required, and or longer rods, which then require a taller cylinder. Its probably only worth boring if you have to rebuild the motor anyway after it is worn out, a couple of pistons is all thats required to increase the size, rather than messing with all the other stuff .
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06-11-2014, 09:31 AM | #3 |
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YEP....big bore piston kits are relatively easy. I am not experienced in knowing if a 1600 engine will fit into a 1500 frame or will all of the electrics/electronics etc. will work. That would certainly be easy if it was a true drop-in.
In "stroking" an engine a different crank (such as installing a second gen Busa crank into a first gen engine, 2nd gen Busa engines have a 2mm longer stroke)) or having the crank stroked by a company such as Falicon or Marine Crankshaft. Stroked engines will require SHORTER not longer rods or cylinder base spacer plates to compensate for the longer stroke. Either method of increasing displacement will offer gains, but there are so many other factors involved and how the engine is gonna be used that will ultimately determine the quality and quantity of power gained. RACNRAY
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06-11-2014, 03:26 PM | #4 |
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1500 specs:
Displacement: 1470 cc Bore x stroke: 102 x 90mm 1600 specs: Displacement: 1,552cc Bore x stroke: 102.0 x 95.0mm The only difference is a 5.0mm longer stroke for the 1600. A 1600 engine will fit into a 1500 frame.
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Last edited by Yellow Jacket; 06-12-2014 at 02:42 PM.
Reason: Apparently my calculator was broken.
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06-11-2014, 05:17 PM | #5 |
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Me thinks ur calculator needs new batteries...there is a 5 mm difference in stroke between the 2 engines, not 3mm.
Jus sayin... RACNRAY
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06-11-2014, 08:30 PM | #6 | |
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06-11-2014, 10:05 PM | #7 |
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Brad your an Ass, but funny. Yeah a funny Ass.
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06-12-2014, 07:26 AM | #8 |
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06-12-2014, 02:39 PM | #9 |
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Nah, I was using the "new math" where a close answer is as good as an exact answer!
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06-12-2014, 03:23 PM | #10 |
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Entirely TMI ..........
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06-12-2014, 11:36 PM | #11 |
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Hey you guys quit picking on my buddy Kris and his baby blue alligator trimmings.:cool::cool:
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06-13-2014, 11:16 PM | #12 |
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Years ago when I had an 04 meanstreak, motorcycle cruiser magazine did an article on the thunder kit. They said the horse power from the kawasaki 1500 and 1600 were the same. They took a1500 Meanstreak to Thunder mfg installed the kit and on the dyno it hit 100 hp. Entertaining article.
http://www.motorcyclecruiser.com/mil...cycle-makeover
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06-19-2014, 09:18 AM | #13 |
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The shorter stroke on the 1500 will wind out and hit it's HP faster.
I know of a 99 1500 Nomad that had the Thunder kit and an assload of porting along with bigger valves installed. The owner also had a V2k, and the built 1500 would stay with it. MT
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06-19-2014, 12:50 PM | #14 | |
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06-20-2014, 02:54 PM | #15 | |
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Where the Thunder kit really makes more power is in the included cams. I'll stand by a comment I've made many times, and that is, if you put 1500 meanie cams or 'A' cams in and do some porting work with larger valves you will get more results than with the Thunder kit. Let's be real, 100 cc's isn't much of a difference, and an 'A' model puts more hp and torque out than the later 1500/1600s. MT
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