A car with a .28 engine will have more torque but it willl use more fuel and can be harder on the cars drive train.

A car with a .21 engine has a higher rpm so will have better acceleration so in theory most .21 engines will be faster than .28 engines.

RC car engine displacements range start at .21ci (Cubic inches). These number that begin with a decimal point are the displacement in cubic inches. So a .21 engine is .21 cubic inches of displacement

Here's a small reference list (cc is rounded) to give you an idea of how cubic inches compare to cubic centimeters:

Engine Cubic Inches to CC Reference
.21ci - 3.5cc
.28ci - 4.6cc
.30ci - 5.0cc

RC Car Nitro Engines

RC car enthusiasts are always on the lookout for high-quality and reliable nitro engines. These engines provide the power and performance needed for competitive racing or simply cruising around the neighborhood. If you're in the market for a new nitro engine, you'll be pleased to know that there are plenty of options available. In this article, we'll take a look at some of the top RC car nitro engines for sale.

RC Nitro Engine Kit

For those who like to build their own engines, a nitro engine kit is the perfect choice. These kits come with all the necessary parts and instructions to build a complete engine from scratch. One of the top RC nitro engine kits on the market is the Novarossi 35 Plus 21 Engine Kit. This engine features a 3.5cc displacement and is capable of producing up to 2.4 horsepower. It's also designed with a ceramic rear ball bearing and a balanced crankshaft for improved durability and performance. The Novarossi 35 Plus 21 Engine Kit is a great choice for those who want to build their own high-performance engine.

Nitro Engine for Sale

If you're looking for a pre-built nitro engine, there are plenty of options available. One of the most popular nitro engines on the market is the Traxxas TRX 3.3 Racing Engine. This engine is designed specifically for the Traxxas Revo and T-Maxx RC trucks, but it can also be used in other vehicles with the appropriate conversion kit. The TRX 3.3 features a 5-port design and delivers up to 60% more peak horsepower than the previous version. It's also equipped with a high-volume air intake system and a precision carburetor for improved performance and fuel efficiency.

Another great nitro engine for sale is the HPI Racing Nitro Star F4.6. This engine features a 4.6cc displacement and is capable of producing up to 2.9 horsepower. It's designed with a slide carburetor and a pull-start system for easy starting and tuning. The Nitro Star F4.6 also features an aluminum heatsink head and a cast aluminum piston for improved durability and performance.

O.S. Nitro Engine

O.S. Engines is one of the most trusted brands in the RC car industry, and their nitro engines are known for their quality and performance. One of their top nitro engines is the O.S. Speed B21 Ty Tessmann II Engine. This engine is designed with a 3.49cc displacement and is capable of producing up to 2.61 horsepower. It's equipped with a slide carburetor and an aluminum heatsink head for improved cooling and performance. The B21 Ty Tessmann II Engine also features a ceramic rear ball bearing and a tungsten-balanced crankshaft for improved durability and smooth operation.

Another great O.S. nitro engine is the O.S. MAX 21XR-B Ver.II Engine. This engine features a 3.5cc displacement and is capable of producing up to 2.6 horsepower. It's designed with a slide carburetor and an aluminum heatsink head for improved cooling and performance. The MAX 21XR-B Ver.II Engine also features a rear ceramic ball bearing and a DLC-coated crankshaft for improved durability and efficiency.

RC Engine Kit

For those who prefer to build their own engines but want a more affordable option than the Novarossi 35 Plus 21 Engine Kit, the HPI Racing Nitro Star T3.0 Engine Kit is a great choice. This engine features a 3.0cc displacement and is capable of producing up to 1.5 horsepower.