711cc & 765cc Engine Kits
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Oops, maybe I should have asked that differently. I was wondering how many other people have done this modification. We have built two of these for trackday use and they are awesome. The bike is so light and narrow it makes the extra power and torque feel like a 1000cc superbike.
Jamie
Jamie
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Hanman,
Did you put the 765 crank in a standard bore 675 or one of your big bore motors?
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TJ, always good to hear from you.
We coupled the crank with a big bore (78mm piston) to get the 765cc. The piston for this configuration is different from what we typically run in the 711cc motors in that it's a 17mm wrist pin.
Come out to Gingerman on Friday and you can ride it!
Jamie
We coupled the crank with a big bore (78mm piston) to get the 765cc. The piston for this configuration is different from what we typically run in the 711cc motors in that it's a 17mm wrist pin.
Come out to Gingerman on Friday and you can ride it!
Jamie
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870 Posts
I bet this took a lot of work to fuel and tune properly.
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It's no more work than developing a fuel map for any other modification. Apex Manufacturing does all of our dyno tuning.
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The benefit in using an OEM crankshaft is the fatigue strength. Most crank manufactures fillet roll the pins which is a massive improvement in fatigue strength over grinding a tangential radius which is what you have to do when welding. I'm not aware of any companies that are able to fillet roll on a prototype basis due to the dedicated tooling required. Stroker cranks are mostly used in drag racing and not road racing due to the amount of time at peak power.
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Cost is roughly another $3000 on top of a standard build, this includes the piston kit, crank, rods, block and head gasket. Standard build pricing can be found at www.HanshawEngines.com.
Peak power between the 711cc and 765cc motors is very close, in the low 140's depending on fuel. Increasing the stroke increases torque and produces the same power at equivalent piston speeds which is roughly 1000RPM sooner on the 765cc motors. The torque increase is what makes the bike so much faster accelerating out of corners.
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214 Posts
Nice and which generation match the 765 build?
Is it feasible with a street triple engine? 2012 with daytona cam in paticular?
Sent from my SM-G920W8 using Tapatalk
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If anyone is interested I have big bore kits available, 711cc or the 765cc.
Compression ratio depends on build but typically results in 14.5:1.
Pistons, wrist pins, clips, and rings are new.
Cylinder block and connecting rods are remanufactured.
711cc kit is $1500 plus shipping
The 765 kit comes with a new crankshaft and new rods and is $3000 plus shipping.
Hanshaw Racing Engines has built dozens of these along with stroker 765cc versions.
[email protected]
Compression ratio depends on build but typically results in 14.5:1.
Pistons, wrist pins, clips, and rings are new.
Cylinder block and connecting rods are remanufactured.
711cc kit is $1500 plus shipping
The 765 kit comes with a new crankshaft and new rods and is $3000 plus shipping.
Hanshaw Racing Engines has built dozens of these along with stroker 765cc versions.
[email protected]
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Email sent
Hello, I am team member from formula student team.
We would like to build new engine with 711 kit.
Is it still actual?
Is it possible to send the big bore kit to Europe?
Please, send me more information
My email is [email protected]
Or just replay to this post.
We would like to build new engine with 711 kit.
Is it still actual?
Is it possible to send the big bore kit to Europe?
Please, send me more information
My email is [email protected]
Or just replay to this post.
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