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Old 09-12-2009, 09:07 PM   #16
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That I don't know but nearly everyone uses the same front bearing. The only difference is they use a rubber sealed one on offroad engines. As far as the rest of the case goes, they look about the same but have never measured the port castings to see.
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Old 09-12-2009, 11:07 PM   #17
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The size of the bearing has nothing to do with the kind of engine, it is just an evolution and at the same time a saving of their own market. The 14 x 25.4 bearing is used with most brands and if you have the choice between a Picco bearing for half the price as a Novarossi then the choice is simple made.

The difference between onroad and offroad is indeed only the internal timings. An offroad is made for less RPM but more bottom torque and most of the time it is set with a lower exhaust port which is easy to raise and with that also a smaller cranktiming. Because the lower RPM it is possible that less strong materials are used, high revs takes a lot of strength of the materials.

But an offroad engine in an onroad car like a Mugen or Serpent gets a shorter manifold which will give automaticly a higher rpm, that will result into a not so bad performing car, it is for sure a right choice on short tracks. On a GT car which is buggy based you will get a longer manifold and so standard buggy performances. But a good buggy engine will perform better than a standard LRP, SH or Force .28 engine and with the right drivestyle it could save fuel as the same theory is used with truggy cars.
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Old 09-13-2009, 05:22 PM   #18
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Quote:
Originally Posted by wingracer View Post
Actually, the Jammin is probably a Picco while the Force is probably SH.
Force is also a Picco engine.
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Old 09-13-2009, 05:58 PM   #19
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Force is also a Picco engine.
Are you sure about that? I'm looking at photos of lots of Force motors right now and they look like SH to me.
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Old 09-13-2009, 09:08 PM   #20
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The Force .28 that comes with the Ofna DM-1 rtr is a Picco engine.
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Old 09-13-2009, 09:47 PM   #21
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If true, get that motor. Still not sure about that though. Need to get an up close look at one.
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Old 10-22-2009, 10:36 PM   #22
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The difference between onroad and offroad is indeed only the internal timings. An offroad is made for less RPM but more bottom torque and most of the time it is set with a lower exhaust port which is easy to raise and with that also a smaller cranktiming. Because the lower RPM it is possible that less strong materials are used, high revs takes a lot of strength of the materials.
I'm pretty sure off road and on road engines have just about the same amount of precision and detail to the internals parts to achieve the required horsepower and rpms needed for their different applications.
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Old 11-04-2009, 05:41 AM   #23
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Offroad engines are designed to have torque. I also read in the nitro offroad section that offroad engines are designed for only being at top throttle for a limited amount of time unlike on road engines
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