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O.S Engines thread

Old 08-02-2022, 02:31 PM
  #2806  
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Running a B2103 S Low Profile, does anyone else have poor fuel mileage? Seems to run great, but I PUSH 6:30 fuel stops. Running a Venturi 6 in it as well. Is that a limitation with the carb?
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Old 08-03-2022, 08:36 AM
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Originally Posted by supasmo View Post
Running a B2103 S Low Profile, does anyone else have poor fuel mileage? Seems to run great, but I PUSH 6:30 fuel stops. Running a Venturi 6 in it as well. Is that a limitation with the carb?
I’ve been told the Samurai S03 is the same except for cooling head. With that being said I get good fuel mileage, between 8.5-9.5 depending on the track.
My race partner has the low head 2103 and with only maybe a gallon on it if that is getting I would say around 8mins give or take a bit based on track.
The carb is actually supposed to be better for fuel mileage. We both run 6.5mm venturi

How much fuel do you have through engine?
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Old 08-03-2022, 01:03 PM
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Originally Posted by Galatians2 20 View Post
Iíve been told the Samurai S03 is the same except for cooling head. With that being said I get good fuel mileage, between 8.5-9.5 depending on the track.
My race partner has the low head 2103 and with only maybe a gallon on it if that is getting I would say around 8mins give or take a bit based on track.
The carb is actually supposed to be better for fuel mileage. We both run 6.5mm venturi

How much fuel do you have through engine?
So when the engine was newer it ran 8 min easily. After the engine had itís first bearing change at around 1.5-2 gal i have noticed the decrease in time. Iím a bit over 2 gal through it.
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Old 08-09-2022, 12:44 PM
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Originally Posted by supasmo View Post
So when the engine was newer it ran 8 min easily. After the engine had itís first bearing change at around 1.5-2 gal i have noticed the decrease in time. Iím a bit over 2 gal through it.
Sounds like you just need to lean it out. Because speeds are so fast, alot of folks try to stay rich, in order to tame it.
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Old 08-10-2022, 02:28 PM
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AD3 is coming!!!!!!
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Old 08-15-2022, 12:33 AM
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Hello all, I have a engine with a runtime of 1 Gallon. Very good shapeÖall bearings top! But I have a tuning issue.
I drove the engine to a good temperatureÖ.brake that my car stopped and the the engine fell in a very deep idle but ONLY for one or two seconds then it normalized automatically to a very good idle. Problem isÖ.very often the engine dies. Hope someone has an idea
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Old 08-15-2022, 01:10 AM
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It looks like you have to adjust the trim more to the brake and raise the trim.

If you are sure in neutral the carburator is pushed against the idle screw then you have to look at the clutch for something like a sticking bearing or clutch shoe.
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Old 08-31-2022, 02:24 PM
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AD3 is on Horizon available to pre-order..
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Old 09-05-2022, 04:57 PM
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So what's the consensus on the best overall O.S. engine for buggy? Looking for great power output but also good mileage and easy tuning. Gets a little confusing trying to find all the differences between various models. Is the 2104 the latest?
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Old 09-05-2022, 11:16 PM
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Originally Posted by blaze309 View Post
So what's the consensus on the best overall O.S. engine for buggy? Looking for great power output but also good mileage and easy tuning. Gets a little confusing trying to find all the differences between various models. Is the 2104 the latest?
Do you only do club races ? OR mostly go to big big races ?
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Old 09-05-2022, 11:38 PM
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Originally Posted by Phillip F View Post
Do you only do club races ? OR mostly go to big big races ?

A bit of a mix. I do a lot of club and semi local trophy races. Bigger events such as Racetime are about twice a year.
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Old 09-06-2022, 03:18 AM
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I would take a look at the new AD3, the AD2 has been pretty popular from what Iíve seen.
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Old 09-06-2022, 09:57 AM
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Originally Posted by blaze309 View Post
So what's the consensus on the best overall O.S. engine for buggy? Looking for great power output but also good mileage and easy tuning. Gets a little confusing trying to find all the differences between various models. Is the 2104 the latest?
I’m not sure you can say there is one best overall.
I’ve begun running more OS & OS based engines and all of them have been great.
I think some better questions would be what are you looking for.
What’s your budget?
How do you want the power curve?

Current models of OS & OS based I’ve been running and pipes used are:

Protek Samurai S03 (75mm/2100)- costs a little less, has great power bottom to top but smoother bottom with this pipe and usually get around 9mins on tank

Ninja JX21-B06 (Hipex L50/2135)- costs a little less, crazy power overall w/pipe combo, also around 9mins on tank

In truggy:

OS B2104 (85mm/2090) - great power in truck. In buggy would run 80mm or 75mm header with 2100 pipe for smoother bottom and great top end. Getting between 8-9mins in truggy

OS B2103 type R (85mm/2090) - once broken in the power is awesome actually surprised me. I feel it’s a lot for buggy but would tone it down with 75mm/2100 pipe combo. Last truggy race pit at about 8.5min mark on looser track.

Some people talk smack about the carb on the S03 and the 22 series carbs on these new OS engines but I love them and have no issues. All engines idle smooth and have had no issues other then slight tuning adjustments with weather and early on as they broke in fully.

AD2 & Rhonda I’ve heard is great engine with smooth power curve.

Flashpoint FP02 is a popular low priced choice. It is a spec 2 rebranded. Great engine for both buggy & truggy. (I haven’t ran mine yet)

Ongaro engine is B2104 with a few changes internally. Supposed to smooth out the power band compared to standard 2104

All should get you 8-10mins on tank based on your tune, track size, and throttle control. I have a heavier trigger finger.

Hope this helps some.
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Old 09-14-2022, 03:53 PM
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Does anyone know if the typeS P/S will fit in the Protek R03 crank case
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Old 09-25-2022, 11:10 PM
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Originally Posted by Galatians2 20 View Post
AD2 & Rhonda Iíve heard is great engine with smooth power curve.

Ongaro engine is B2104 with a few changes internally. Supposed to smooth out the power band compared to standard 2104
For the best engine I guess we should be looking at the top end ones. As I understand thats B2103, B2104, Ongaro, AD2 and AD3.

Ongaro is a modified B2104.

What I wonder then is why on AD2 and AD3 it says "O.S. Max" which is the budget model?
Are ADs not based on the premium models but the budget ones?
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