What Makes Hirth Aircraft Engines Different?

When initially looking at the Hirth Aircraft engine line, it may at first appear that Hirth engines are more expensive than equivalent engines from other sources. We would like you to consider the 1000hr rated TBO, one year warranty, superior reliability, and the lower RPM operating range. Over the long run you will find that Hirth aircraft engines can actually turn out to be the least expensive choice.

Most engines in the light aircraft market were designed for a specific use on the ground and then altered to be used in aircraft. Hirth engines are designed specifically for aircraft use. Hirth does not make snowmobile, water craft, or car engines and then try to modify them for aircraft applications. Hirth knows that in order for a 2 cycle engine to perform properly in aircraft use, peak power and peak torque have to be achieved at lower RPMs. The engine has to have a realistic TBO and not use complicated rotary valves. The use of Nikasil cylinders and Hyper-Eutectic Aluminum pistons make Hirth engines very seizure resistant. Our red line CHT is 535F, our redline EGT is 1256F. This gives Hirths good fuel efficiency and a very clean oil burn. The use of chrome moly steel crankshafts insure long life with little chance of failure. It costs more to build an engine when you use the best technology and materials available but in the long run you will find that Hirth is the better value.

Hirth Aircraft Line

All Hirths have Al-Nikasil coated cylinders for superior performance and reliability. Al-Nikasil in simple terms is a nickel based material, applied in a paste form. When super heated it becomes part of the cylinder itself. Al-Nikasil provides for a super low coefficient of friction allowing Hirths not only to produce more hp than our nearest competitor but also to run with greater efficiency and reliability.
Hirths crankshafts are 4130 chrome moly steel. Heads, rings, block casting, connecting rods and associated components are all of the highest grade alloys available today.

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F-36 2 cycle 15hp The F36 are from the same family of engines and are some of the lightest single cylinder engines you'll find anywhere Engine Type: 2 cycle, single cylinder Horsepower: 15hp @ 6000rpm Torque: 19ft.lbs @ 6000rpm Cooling: Free air cooled

 

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F-33 2 cycle 28hp The F33 engines are some of the lightest single cylinder engines you'll find anywhere Engine Type: 2 cycle, single cylinder Horsepower: 28hp @ 6500rpm Torque: 25ft.lbs @ 6000rpm Cooling: Free air Cooled by prop or slip stream (Optional fan cooling available)

 

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2702 2 cycle 40hp The 2702 is our small high torque low RPM engine. Like it's big brother, the 3202 it's a low RPM powerhouse, at an incredible 5500 rpm this little engine is producing 40hp and it's pumping out 39ft/lbs of torque at only 4500 rpm. The Hirth 2702 is ideal for single seat ultralight aircraft. Engine Type: 2 cycle, single cylinder Horsepower: 40hp @ 5500rpm Torque: 39ft.lbs @ 4500rpm Cooling: Optional, fan cooled or free air cooled by prop

 

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F-23 2 cycle 50hp If you prefer an opposed cylinder engine, then this one's for you. The F-23 puts out an amazing 50hp at only 6150 rpm and provides 42ft/lbs. of torque. All with a total weight of only 84 Lbs.. This engine can handle any part 103 ultralight and most single seat experimental aircraft. Opposed pistons cancel out each others internal inertia forces resulting in an amazingly smooth running engine. Engine Type: Opposed - 2 cycle, two cylinder Horsepower: 50hp @ 6150rpm Torque: 42ft.lbs @ 6150rpm Cooling: Free air Cooled by prop blast

 

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3202 2 cycle 55hp (Replaced Hirth 2704 - May 2002) Hirth's High Torque low RPM engine. The 3202 produces 55hp at only 5500 rpm while building an impressive torque of 52ft/lbs. at only 4500 rpm. This low RPM operation equates to the smoothest and quietest running power plant you'll will find anywhere. Hirth 3202 the biggest little engine available. This is an excellent replacement/upgrade for the discontinued Rotax 503. Engine Type: 2 cycle, two cylinder Horsepower: 55hp @ 5500rpm Torque: 53ft/bs @ 5000rpm Cooling: Optional, fan cooled or free air cooled by prop

 

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3203 2 cycle 65hp (Replaced Hirth 2706 - May 2002) Hirth's most popular engine. The 3203 produces more Horsepower and Torque per pound then any other engine in it's class. The Hirth 3203 is the premiere powerplant for the heaviest of Ultralight trainers and light Experimentals today. Engine Type: 2 cycle, two cylinder Horsepower: 65hp @ 6300rpm Torque: 55ft/bs @ 6000rpm Cooling: Optional, fan cooled or free air cooled by prop

 

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3502 water cooled 2 cycle 60hp The new 3502 2 cylinder water cooled engine. Engine Type: 2 cycle, two cylinder Horsepower: 60hp @ 5000rpm Torque: 62ft/bs @ 4750rpm Cooling: Liquid cooled.

 

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3503 water cooled 2 cycle 70hp The new 3503 2 cylinder water cooled engine. Engine Type: 2 cycle, two cylinder in line Horsepower: 70hp @ 6500rpm Torque: 57ft/bs @ 6000rpm Cooling: Liquid cooled.

 

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3702 - 3 cylinder - 2 cycle water cooled 84hp Hirth's latest design. 3702's have a very narrow profile allowing installation in small cowlings. Very low fuel consumption rivals similar Hp 4 cycle engines. Engine Type: 2 cycle, three cylinder Horsepower: 84Hp @ 4950Rpm Torque: 87 Ft.Lbs @ 4300Rpm Cooling: Water cooled

 

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3703 - 3 cylinder - 2 cycle water cooled 100hp Hirth's latest design. 3703's have a very narrow profile allowing installation in small cowlings. Very low fuel consumption rivals similar Hp 4 cycle engines. Engine Type: 2 cycle, three cylinder Horsepower: 100Hp @ 6000Rpm Torque: 88 Ft.Lbs @ 5500Rpm Cooling: Water cooled

 

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3002 2 cycle 80hp Flagship of the Hirth product line; the 300x series are available in two versions, the solid 3002 80hp and the awesome 3003/2c 110hp. The Hirth 300x series is the premiere power plants for the Experimental and Homebuilt industry. Engine Type: 2 cycle, four cylinder Horsepower: 85Hp @5500rpm 80Hp W/ fan cooling Torque: 78ft/bs @ 4500rpm Cooling: Free air cooled, optional fan cooling available.

 

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3003 Fuel Injected 110 hp Flagship of the Hirth product line; the 300x series are available in two versions, the solid 3002 80hp and the awesome 3003/2c 110hp. The Hirth 300x series is the premiere power plants for the Experimental and Homebuilt industry. Engine Type: 2 cycle, four cylinder Horsepower: 110Hp@6200rpm, 105Hp W/ fan cooling Torque: 89ft/lbs @ 5700rpm Cooling: Free air, optional twin fan cooling

Quality Support

While the quality and design of the engine is of course important. After-sale support of the engine is of equal importance. Recreational Power Engineering has developed the most comprehensive support system in the industry. Engines are warranted for a full year plus a 3 year pro-rated crankshaft warranty. Warranty not only covers defective parts but also labor, free tech support, and prepaid return shipping of the engine. These are all unprecedented support features.

NOTE: Hirth engines are manufactured on a limited basis. There can be a 4 to 6 week lead-time on some models. It is best to get your order in well before your kit is complete to avoid waiting on your engine. 50% down is required to order.

!!!Prices subject to change without notice. Call or write for current pricing!!!

We hope you like what you've seen

Thank you for visiting RPE's Hirth Web Pages. Let us know via e-mail, phone, fax, or snail-mail, which engine(s) interest you and we will be happy to send you detailed data sheets and 9"X 11" dimensional drawings free of charge. Full size prints are available for $10 each. If you have any questions feel free to contact us at your convenience.
Thanks for giving Hirth a look