O.S. 21XZ-R On Road ABC Engine
New from O.S. Engines, the .21XZ-R On-Road ABC engine is designed to take drivers to victory at major 1/8 scale on-road championship races. The tungsten-weighted crankshaft creates optimum balance for consistent low and mid-speed torque while the cylinder liner features 7 scavenger ports and 3 exhaust ports for more efficient combustion. Other improvements over its predecessor include a newly designed 21M carburetor, a lighter piston and a more durable conrod.
Specifications
Displacement: .213 ci (3.49cc)
Bore: .640 in (16.27mm)
Stroke: .661 in (16.8mm)
Practical RPM: 4,000 – 45,000 rpm
Power Outlet: 2.7 hp/33,000 rpm
Weight: 12.32 oz (348g)
Available: Late October
Source: OS Engines [osengines.com]
Categories - Engines, OS Engines, Products
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Comments
1. M7H - October 27th, 2009 at 11:00
I want one!
According to the OS website it has 3.31 HP!
I forsee belt replacement every qualifier!….
2. Stefan - October 27th, 2009 at 12:37
3.31 hp LOL … put it on a dyno and you can be happy when the fastest of the fast will make 1.7-1.8 true hp. But sure it’s worth a guess depending on the price and on a maybe upcomming Speed version. For sure it was able to help Shimo to take the Japanese title already.
3. X - October 27th, 2009 at 14:46
those specs in the os web page are from a .28
4. M7H - October 27th, 2009 at 17:04
I’ve seen it for around USD 270,- in a HK webshop.
Which is a very nice price!
I’ve also read about problems with the engine at the RCTech forum, but maybe they’ve solved those issues now…..
5. Stefan - October 27th, 2009 at 23:27
Thx for the info guys. That’s really a great price.