RevTech engines are aftermarket V-twin motorcycle engines manufactured by the California-based Custom Chrome USA LLC. The sizes of these power sources range from 88 cubic inches up to 125 cu in and are sold as replacements for stock Harley 84-99 Evolution engines. Besides complete engines, Custom Chrome offers a plethora of aftermarket parts for Harley owners.
If you want to find out more about these popular power sources, you’ve come to the right place.
We at PowerSportsGuide have compiled everything you need to know into this RevTech engine review!
What is a RevTech Engine?
RevTech is a reputable brand of aftermarket V-twin motorcycle engines and parts manufactured by Custom Chrome USA. Besides these amazing power sources, the American manufacturer offers a wide variety of aftermarket motorcycle parts, including:
- Big bore kits
- Oil change kits
- Transmissions
- Gear sets
- Seats
- Custom body kits
- Gear
RevTech engines are designed to be a replacement for stock Harley power sources, but they can be used on any custom build project.
The manufacturer claims these power mills are engineered with three main goals in mind; outstanding looks, reliability, and huge power.
Besides RevTech, Custom Chrome USA LLC owns many other well-known brands including:
- Motor Factory: Complete line of replacement parts
- Santee: Foundation products with a rich heritage of quality
- Jammer Cycle Products: Old-school products
- HR3: Custom painted body kitsfor Harleys
- Inferno – “World’s finest products” for Harleys
- Tour Ease – “World’s finest products” for Harleys
- C.C. Rider – 1000+ styles of high-quality seats for Harleys
Where are RevTech Engines Manufactured?
According to the manufacturer, RevTech engines are assembled in the US with high-quality parts. Among the suppliers of the company are Mikuni, Andrews, Dynatek, Timken, and KB Pistons.
RevTech Engine Reviews
RevTech offers five different complete engine configurations, which are as follows:
- RevTech 88” Engine
- RevTech 100” Engine
- RevTech 110” Engine
- RevTech 115” Engine
- RevTech 125” Engine
These V-twin power sources are intended to replace ‘84-‘99 Evolution Harley-Davidson engines.
Therefore, these units can be a worthy replacement for your tired stock Harley engine or the base for a custom-build project.
In a nutshell, the key features of RevTech engines are as follows (applies to all engines):
- Cast aluminum crankacase (356-T6 aluminum)
- Smooth crankcase deck and blind case bolts for a cleaner appearance
- 7/16” threaded cylinder studs
- Forged flywheels from (4140 steel)
- Forged connecting rods (4340 Chrome moly Steel)
- 1-1/2” pressed-in crankpin (8620 Gear Material)
- Larger cooling fins with machined edges for better performacne and appearance
- Keith Black forged slipper pistons
- Moly coated skirts
- Mikuni HSR carburetors (42 or 45 depending on the model)
- Intake manifold matched to the heads
- Low profile air cleaner design
- Self-contained solid-state ignition
- Available finishes: natural aluminum, black, and polished
Let’s get down to the nitty-gritty and talk about each in detail!
RevTech 88” Engine
What is a RevTech 88”?
The RevTech 88” is an 88 cubic inch V-Twin engine with the following specifications:
- Displacement: 88 cu in
- Bore: 3.625”
- Stroke: 4.500”
- Cylinders: 2
- Carb: Mikuni HSR42
- Pistons: Keith Black Forged Slipper
- O-ring base seals instead of gaskets
- Pin diameter: .792”
- Cam lift: .495”
- D-shaped exhaust ports
- Late style external oil pump
- Wider-spaced head bolt pattern
RevTech 100” Engine
What is a RevTech 100”?
The RevTech 100” is a 100 cubic inch V-Twin aftermarket motorcycle engine manufactured by Custom Chrome. The key specifications of this power mill are as follows:
- Displacement: 100 cu in
- Bore: 4.000”
- Stroke: 4.000”
- Cylinders: 2
- Carb: Mikuni HSR42
- Pistons: Keith Black Forged Slipper
- Pin diameter: .792”
- Cam lift: .560”
- D-shaped exhaust ports
- Piston cooling oil jets
How Much HP does the RevTech 100” have?
Although the manufacturer doesn’t release official horsepower numbers, there are rumors that the RevTech 100” has about 100-105 HP on the dyno.
RevTech 110” Engine
What is a RevTech 110”?
As the name suggests, the RevTech 110” is a V-Twin 110 cubic inch aftermarket motorcycle engine. The key specs of this unit are as follows:
- Displacement: 100 cu in
- Bore: 4.000”
- Stroke: 4.375”
- Cylinders: 2
- Carb: Mikuni HSR45
- Pistons: Keith Black Forged Slipper
- Pin diameter: .792”
- Cam lift: .560”
How Much HP does the RevTech 110” have?
Although the manufacturer is hesitant to release the official horsepower numbers, based on our research the RevTech 110” engine has about 110 HP and 120 lb-ft of torque.
RevTech 115” Engine
What is a RevTech 115”?
The RevTech 115” engine is an aftermarket 115 cubic inch motorcycle engine. The key specs of this power source include:
- Displacement: 115 cu in
- Bore: 4.125”
- Stroke: 4.300”
- Cylinders: 2
- Carb: Mikuni HSR45
- Pistons: Keith Black Forged Slipper
- Pin diameter: .927”
- Cam lift: .560”
RevTech 125” Engine
What is a RevTech 125”?
The RevTech 125” is the flagship power source in the RevTech engine lineup. The key specs of this power source are as follows:
- Displacement: 125 cu in
- Bore: 4.25”
- Stroke: 4.41”
- Cylinders: 2
- Carb: Mikuni HSR45
- Pistons: Keith Black Forged Slipper
- Pin diameter: .927”
- Cam lift: .560”
RevTech Engine Specs Chart
For a clearer comparison, we’ve compiled the key specifications of RevTech engines into one chart:
| Model | Displ. (cu in) | Bore (“) | Stroke (“) | Carb |
| RevTech 88″ | 88 | 3.625 | 4.500 | Mikuni HSR 42 |
| RevTech 100″ | 100 | 4.000 | 4.000 | Mikuni HSR 42 |
| RevTech 110″ | 110 | 4.000 | 4.375 | Mikuni HSR 45 |
| RevTech 115″ | 115 | 4.125 | 4.3 | Mikuni HSR 45 |
| RevTech 125″ | 125 | 4.25 | 4.41 | Mikuni HSR 45 |
Disclaimer: These charts are for informational purposes only! For more information, please check the official factory manuals!
Takeaways – FAQs About RevTech Engines
As a takeaway, we’ve answered the most frequent questions about RevTech engines!
How Much Do RevTech Engines Cost?
As a rule of thumb, the prices of RevTech motorcycle engines range from $4,000 up to $6,000.
What Size Motors does RevTech Make?
RevTech currently offers engines with six different displacements, varying from 88 cu in to 125 cu in to be more specific, the sizes of RevTech engines are as follows:
- 88 cu in
- 100 cu in
- 110 cu in
- 115 cu in
- 125 cu in
Which RevTech Engine is the Biggest?
The biggest RevTech engine is the RevTech 125” (Bore: 4.25” and Stroke: 4.41”).
How Much Horsepower Does a RevTech Engine Have?
The manufacturer doesn’t release the official HP ratings of their products, but you can expect the power of a RevTech engine to fall into a range of 90-130 HP.
Are RevTech Engines Made in the USA?
RevTech engines are assembled in the US, but the parts come from various suppliers. The main company of RevTech is Custom Chrome USA LLC. headquartered in Morgan Hill, California.
What Kind of Oil does RevTech Engines Use?
Custom Chrome recommends its RecTech engine oil for its Ultima engines. These lubricants are specifically formulated for 4-stroke V-twin motorcycle engines like RevTech and Harley.
Is RevTech a Harley Engine?
Contrary to popular belief, RevTech engines are not manufactured by Harley-Davidson. Instead, RevTech is an aftermarket engine brand that offers engines for H-Ds and other custom-build projects.
How do You Know Which RevTech Engine You Have?
You can easily identify a RevTech engine as its size is stamped on the carburetor cover.
Who Makes RevTech Engines?
RevTech engines are manufactured by the California-based Custom Chrome USA LLC.
UPDATE: Unfortunately, it seems that RevTech engines are currently unavailable!
References
