Comparison of Nitro Engines for R/C Cars
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Nitro Engines Performance Chart

Confused about engine size and horsepower? Here is a side-by-side comparison and review of small, medium, and big block R/C nitro engines from HPI, OFNA, OS Engines, Traxxas, and more.

Small Block (.12 - .18ci) Nitro Engines

Company Model / Brand O.S. 12TR HPI Pro 12R XS Picco XP12R
Size (ci) .12 .12 .12
Horsepower / rpm 1.1 hp 1.35 hp @ 38,000 rpm 1.45 hp @ 39,000 rpm
Piston / sleeve Chrome plated ABC ABC
Carb 5.5mm bore, slide valve 5.5mm bore, slide type 2-needle, slide
Exhaust Rear Rear Rear
Price   $ 134  
Usage 1/10 gas on-road 1/10 gas on-road 1/10 gas on-road
Reviews Offer 10% more touring power than .12CV-Rs. [1] A real screamer, with very good low-end pull and an absolutely track-blistering top end. [2] [3]

Resources:
1. OS Engines
2. R/C Car Magazine Nov 2003
3. Radio Control Car Action Magazine Nov 2003

Big Block (.21ci) Nitro Engines

Model O.S. Engines .21 VZ-B    
Size (ci) .21    
Horsepower / rpm 2.45 @ 32,000 rpm    
Piston / sleeve Chrome    
Carb -    
Exhaust Rear    
Price $279.99    
Usage 1/8 gas buggies    
Reviews The VZ-B was amazing. the response from low rpms is absolutely unreal. [1]    

Resources:
1. R/C Car Magazine Nov 2003

Big Block (.25ci and bigger) Nitro Engines

Here are engines that are bigger than the big-blocks, yet usually have the same outer dimensions (size) as the .21ci engines.

Model Team Orion Wasp HPI Nitro Star S-25 Dynamite Mach .26
Size (ci) .26 with pull-start .25 with pull-start .26 with pull-start
Horsepower / rpm 2.7 @ 37,000 rpm 2.5 hp 2.75 @ 30,000 rpm
Piston / sleeve ABC ABC ABC
Carb 8mm 3-needle slide 7mm, 2-needle slide 8mm 2-needle slide
Exhaust Rear Rear Rear
Price $ 199 $ 139 $ 139
Usage 1/8 monster trucks 1/8 monster trucks 1/8 monster trucks
Reviews This is a high performance mill, made in Italy from the finest material and with utmost care and attention to detail. [1] The S-25 is available for installation in any truck or buggy that was built to carry a .21 engine. [2] This big bore powerhouse is designed to push the T-Maxx to the outer limits of monster truck performance. [3]

Resources:
1. R/C Car Magazine Nov 2003
2. Radio Control Car Action Magazine Nov 2003
3. www.dynamiterc.com

Model Sirio S27Pro OFNA Force .26 OFNA/Picco .26 Outlaw
Size (ci) .27 .26 with pull-start .26 with pull-start
Horsepower / rpm 3.1 hp 2.41 hp 2.75 hp
Piston / sleeve ABC ABC ABC
Carb 8mm 2-needle slide valve 8mm 2-needle slide 8mm 2-needle slide
Exhaust Rear Rear Rear
Price $ 379 $ 135 $ 189
Usage 1/8 monster trucks 1/8 monster trucks 1/8 monster trucks
Reviews [1] [1] Manufactured by Picco, these engines have been strong contenders in the horsepower wars for both small- and big-block engines. [1]

Resources:
1. Radio Control Car Action Magazine Nov 2003

Model XTM 24.7 Pro    
Size (ci) .247 with pull-start    
Horsepower / rpm 2.75 hp    
Piston / sleeve ABC    
Carb 8mm 2-needle slide carb    
Exhaust Rear    
Price $ 189    
Usage 1/8 scale    
Reviews [1]    

Resources:
1. Radio Control Car Action Magazine Nov 2003

 

 

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