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Old 02-22-2013, 09:33 PM   #1
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Default "Off-Road" engines for an On-Road car.....

So, I'm looking at the specs on different engines and I see some say on-road and some say off-road, what's the difference between the two? I'm mainly interested in the Werks engines, 41,000RPM and 2.7HP.....seems more like an on-road engine to me. Would it have a different power band that would make it not as suitable for on-road?

I just can't see dropping $500 on a .21 on-road engine.....
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Old 02-23-2013, 01:53 AM   #2
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On short tracks an offroad engine is a good option, tons of bottom torque but not that much top RPM. On larger tracks that is a disadvantage of more than a seccond a lap. If you dare to modify it you must change some things to get it more like an onroad engine but then again looking at Novarossi you will see the different conrod can be an early breaking point.

$500 is indeed much. over here there are clubs and a competition running 5 port onroad engines. The N21-5T is an awesome engine and the same is with the Sonic 5 port Basic engine. You will not be disapointed with these.
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Old 02-23-2013, 08:07 AM   #3
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werks b5 as a great gt engine as well as some other buggy engines just remember you do have gearing you can play with for larger or smaller tracks
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Old 02-23-2013, 12:19 PM   #4
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Thanks for the replies. This engine is for a dm1 1/7, I do plan on gearing the hell out of it. I'll check out the two engines mentioned by Roelof.

I'm also considering the LRP ZR.32, but it's max RPM and weight bother me a lot. I'm not racing this car, just building it and bashing so fuel economy couldn't bother me any less. I don't have to go with a .21, but weight is a big factor for me so if I can get power and rpm out of a lighter engine than that's what I'm going to do.

Thanks again,
Greg
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Old 02-23-2013, 05:14 PM   #5
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With the LRP you will have tons of torque so you can set other gearing to convert it to speed.
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Old 02-25-2013, 12:49 PM   #6
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I ran the OS.28 in the DM1 1/8th scale......geared it to the moon and it still ripped on bottom and would pull it no problem down the straights.
Problem is the engine has so much power and it was geared so tall that it would rip up the diffs. IF you are not racing it in 45 min or 60 min mains it will be just fine and be very fast with a bit more drive train maintenance.

This year I have dropped down to the Roma 25........drive train will last longer etc etc....

That is a heavy car so it is hard to get the best of all worlds with one engine......and I find the .21's just don't have the bottom to pull it and still keep the top for long straights. Just my opinion.
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