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Old 09-12-2009, 07:56 AM   #1
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Default Differences between On-Road engines and Off-Road engines

My question pertains to the difference between on and off road engines. What's the real difference between them? Can you run an off-road engine in a on-road car? What problems might I encounter?

I ask this because I run an OFNA DM-1 and I need to pick up an on-road engine of the .28 size to run in the stock GT class with the Kyosho GT's. I predominately run 1/8 scale off road buggies and use RB and Novarossi engines. I could choose to rebuild my RB WS7II (.21) and run the open class or just pick up a new .28 but I don't know what the real differences are between a .21 and .28 engines.

Thanks for your insight.
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Old 09-12-2009, 08:07 AM   #2
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Nothing really in terms of construction and materials. The main difference is timing. On road engines have a lot more timing in them for high rpm HP. Yes you can run offroad motors in onroad. They just won't have the top end that good onroad motors will.
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Old 09-12-2009, 08:08 AM   #3
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I think the difference is the internal tuning of the engine(construcction) I guess the off road engines have moore torque than rpm's and on road engines have moore banance of rpm's and torque but I can be wrong
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Old 09-12-2009, 11:03 AM   #4
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Stick with the Ofna force 28 the car comes with that motor is plenty fast. Just get a JP3 pipe.
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Old 09-12-2009, 11:17 AM   #5
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Stick with the Ofna force 28 the car comes with that motor is plenty fast. Just get a JP3 pipe.
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Old 09-12-2009, 04:16 PM   #6
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Correct me if i'm wrong,but is'nt there a difference in the crankshaft lenth/diameter like sg and something else?
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Old 09-12-2009, 05:02 PM   #7
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Quote:
Originally Posted by p1pioneer View Post
Correct me if i'm wrong,but is'nt there a difference in the crankshaft lenth/diameter like sg and something else?
Nope...
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Old 09-12-2009, 05:09 PM   #8
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There used to be two different cranks. Standard threaded cranks and SG pilot shaft cranks. Onroad went SG first but now everyone uses SG cranks.
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Old 09-12-2009, 05:12 PM   #9
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Quote:
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There used to be two different cranks. Standard threaded cranks and SG pilot shaft cranks. Onroad went SG first but now everyone uses SG cranks.
thank you! dude i know nothing about off road anything.
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Old 09-12-2009, 05:32 PM   #10
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I am curious to find out if their is any difference on the mold for the case offroad vs onroad engine.

Novarossi has two a couple of different cases in the plus 21 series. Seems to be bearing size but I am curious if they are also molded different internally. I would think for a practice engine using onroad internals and crank and offroad case with the large oversized bearings would yield a good workhorse practice engine.

Offroad cases are a dime a dozen on ebay and almost never find onroad cases.
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Old 09-12-2009, 05:47 PM   #11
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What bigger bearings? The biggest bearing I know of is the rear bearing for the Nova onroad motors. The only difference is most Nova offroad motors use a 14mm crank while most factory Nova onroads use a 14.5mm crank, though tuner motors like Max and RB still use 14mm cranks. In 14mm versions you have 25.4 and 25.8mm bearings.
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Old 09-12-2009, 06:24 PM   #12
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Default mabry modified engines

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Old 09-12-2009, 06:42 PM   #13
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Quote:
Originally Posted by Serpent-Dan View Post
Stick with the Ofna force 28 the car comes with that motor is plenty fast. Just get a JP3 pipe.
What? There's no such thing as "fast enough". That's just patently heretical. I'm going to have to revoke your guy-card for saying that! All jokes aside though, you are right and I have heard good things about OFNA's .28 engines and I am talking nitro engines here in case I didn't specify earlier (since motors are to electric what engines are to internal cumbustion).

I'm leaning towards a Jammin .28 which since that's from the racing side of the OFNA house is probably the same basic .28 Force engine your referring too except for some tweaking.

Thanks for chiming in my friend.
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Old 09-12-2009, 06:58 PM   #14
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Actually, the Jammin is probably a Picco while the Force is probably SH.
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Old 09-12-2009, 08:10 PM   #15
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I guess I was wrong. I thought the front bearing on the kangroo was much larger than front bearing on the 35plus21.

Do you happen to know if the case are any different internally? Sure are alot of offroad cases on ebay usually brand new with new bearings.
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