ProTek RC CR21 3-Port .21 Off-Road Engine (Turbo Plug)

Description

ProTek CR21 High Performance .21 1/8 Nitro Club Race Engine

The ProTek RC CR21 3-Port .21 Off-Road Engine is a great option for club racing on smaller tracks. With a freshly designed crankshaft and lightweight piston, the CR21 can deliver smooth power and crisp engine response. The engine shares the same bore and stroke as the highly successful ProTek Samurai engines, promoting peak engine performance. These features give budget-conscious racers an engine capable of extreme reliability and performance.
The CR21 nitro engine uses a 9-fin cooling head to maintain optimal operating temperatures, and add great looks. The combustion chamber is designed to promote low to medium RPM ranges, perfect for club racing, while still offering high-performance output at high RPM. Internally, the engine uses a chamfered “Knife-Edge” connecting rod that reduces reciprocating mass and increases peak RPM. The J3-1 carburetor allows for precise tuning via the three adjustable needles. Two carburetor inserts (6mm – Orange and 7mm – Yellow) are included to aid in tuning conditions.

Features:

• Excellent option for off-road club racers
• Great choice for smaller tracks 
• Advanced crankshaft design and lightweight piston deliver smooth crisp power
• Black anodized 9-fin cooling head
• Includes a ultra hot ProTek P3 turbo glow plug
• “Knife Edged” connecting rod decreases reciprocating mass while increasing rpm
• 3-Needle J3-1 Carburetor allows for precise tuning
• Includes 6mm and 7mm carburetor venturis

Specifications:

• Displacement:.21ci (3.49cc)
• Recommended Application:1/8 Off-Road
• Bore:0.641in (16.27mm)
• Stroke:0.661in (16.80mm)
• Output:2.41hp @ 33,000RPM (2.45ps)
• Porting:
• Intake:2
• Exhaust:1
• Practical RPM Range:4,000-40,000
• Weight:13.43oz (381g)

Recommended Exhaust:

• PTK-2060:ProTek R/C 2060 Tuned Pipe w/Manifold (PTK-2060-1: pipe only)
• PTK-2090:ProTek R/C 2090 Tuned Pipe w/Manifold (PTK-2090-1: pipe only)

Recommended Glowplug:

• PTK-2542: ProTek R/C P3 Turbo Glow Plug (Ultra Hot)

Includes:

• (1) CR21 3-Port .21 Off-Road Engine
• (1) P3 “Glow Plug Turbo Glow Plug “Ultra Hot”
• (1) Exhaust Gasket
• (1) 7mm Venturi
• (1) 6mm Venturi

This product was added to our catalog on September 21, 2022

Dillon Aldred Monday, Mar 20 2023 (about 2 years ago) ProTek RC CR21 3-Port .21 Off-Road Engine (Turbo Plug) The power on the motor is great. Ran it at DNC No issues and multiple club races from silver dollar in chico to full throttle hobbies down in ceres and have like it on every track. the power is real smooth easily drivable. Easy tuning and a mid adjustment makes it nice. ive ran it with the 7mm venturi and the protek 2100 pipe on my buggy. 4 customers found this review helpful. Nathan Williams Verified Owner Thursday, Jan 16 2025 (8 months ago) ProTek RC CR21 3-Port .21 Off-Road Engine (Turbo Plug) This was my first nitro engine and I couldn’t be more pleased. If you’re between this and a FP02, you won’t go wrong with either, I’m pretty sure both of them are the same/similar spec. For $300, you get an O.S. based engine with a 21j carb (the carb on the CR21 is in fact a 21j carb). I have about a gallon and a half on mine so far and compression is still strong and she’s gotten me on the podium.
I paired mine initially with a Hipex 2034, but am now switching to a 2135. I think this engine will work well with anything like a 2135, 2090, 2100, or any other commonly used pipe with O.S. engines.
Solid first engine if you’re new to nitro like I am. 1 customer found this review helpful. Jeremy Kim Verified Owner Thursday, Dec 19 2024 (9 months ago) ProTek RC CR21 3-Port .21 Off-Road Engine (Turbo Plug) The engine looks amazing, but not sure if one small section of the mounting bracket is not anodized. Not sure if that’s on purpose or not, either way I’m happy with what I bought. The manual is pretty easy to understand. And the pipe that came with it, is exactly what i need just my first nitro buggy. 1 customer found this review helpful. Cooper Koliba Verified Owner Wednesday, Jun 12 2024 (about a year ago) ProTek RC CR21 3-Port .21 Off-Road Engine (Turbo Plug) Bought it for my RC8B4 and love it so far. Runs great and is easy to tune.
Would recommend if you dont want to break the bank on an expensive engine. View all reviews