OS Engines

Old 08-23-2012, 05:07 PM
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Does anyone have the OS.28 in a Truggy? I'm between the OS .25 and .28. What are your runtimes?
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Old 08-24-2012, 12:04 AM
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Ran a OS.28 in my truggy when I first raced it. With a full throttle throw and a 7.5MM choke i was getting about 6 min to a tank. Put in a 6MM choke and cut the throttle back until it was just visable looking down the carby and was able to get just over 7. Engine still had more than enough to run with .21 engines until a long straight where it ran out of legs. Never run a .25 but from what I have read they are supposed to be pretty good on run times.
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Old 08-24-2012, 07:13 AM
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I have seen 25's go 9+ with a 6mm restrictor
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Old 08-24-2012, 07:58 AM
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This might sound weird, but the .28 has TOO MUCH POWER! Plus the fuel mileage is not very good either. I would recommend running either a .21 or the .25 in your truggy. If you also race buggy, having another .21 would not be a bad idea and the OS .21 XZ-B or Speed still has plenty of power for your truggy!
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Old 08-24-2012, 08:54 AM
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Originally Posted by ehartman_49348 View Post
This might sound weird, but the .28 has TOO MUCH POWER! Plus the fuel mileage is not very good either. I would recommend running either a .21 or the .25 in your truggy. If you also race buggy, having another .21 would not be a bad idea and the OS .21 XZ-B or Speed still has plenty of power for your truggy!
I have also found the .28 to be way to much power and due to displacement and Tire Spin... the fuel milage is not there.

I found that a solid .21 such as a Speed or Reedy VR121 ST seem to have more than enough power even for a truggy with way better mileage. I know the .25s such as the OS or Nova have a little more grunt but not sure if you really need it.
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Old 08-24-2012, 07:23 PM
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I run the os .25 in my truggie getting about 9 min runs out of it,but have never tested it in a race setting,as we don't have enough people here to hold a race on our make shift track... The thing is amazing in the power department more than enough for a truggie.
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Old 08-24-2012, 08:15 PM
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Is there much difference in run times and power between a .21 or .25?
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Old 08-24-2012, 09:12 PM
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i get 10-12 depending on the track i am at with my os 21
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Old 08-24-2012, 09:18 PM
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Originally Posted by tootall2 View Post
Is there much difference in run times and power between a .21 or .25?
not really, but be ready to get new crank and rod after 2 gallons!!!! have had 3 of these broke in by pros and crank pin wear is still a problem according to them, and is a proven fact by guys who pinch and rebuild OS junk! i will NEVER buy a os engine again!! i have a ninja that still runs excellent only because its a MR, when they where still made by novarossi!~~
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Old 08-24-2012, 10:54 PM
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Originally Posted by nitroal View Post
i get 10-12 depending on the track i am at with my os 21
+1 on 10-12 runtime from a good race .21

I ran an OS .25 1 race day and i could hear the drivetrain crying from the drivers stand. A good quality race .21 is more than enough to toss a truggy around.
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Old 08-25-2012, 07:19 AM
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What is a good quality .21 that won't need any internals replaced after 3 gallons?
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Old 08-25-2012, 07:50 AM
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Originally Posted by tootall2 View Post
What is a good quality .21 that won't need any internals replaced after 3 gallons?
pretty much all of them if you can keep dirt out of the engine........ 99% of the time when a engine fades early its from dirt getting in.......... You can have the best air filter maintenance schedule and dirt will still get into the engine if you run in dusty conditions...........
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Old 08-25-2012, 09:47 AM
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Will the .21 need the best tune to throw the truggy around?
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Old 08-26-2012, 09:18 AM
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Originally Posted by tootall2 View Post
Will the .21 need the best tune to throw the truggy around?
no, I really only see .21's in truggy. Most people dont realize that more power most of the time leads to slower lap times. A nova P5 is a excellent truggy engine for the price
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Old 08-26-2012, 10:06 AM
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Originally Posted by tony montana View Post
no, I really only see .21's in truggy. Most people dont realize that more power most of the time leads to slower lap times. A nova P5 is a excellent truggy engine for the price
agreed. And a stock P5XLT can be had for a little over $200. Or you can get some work done to it for a little more $ and blow away a stock .25 and get better run times.
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