TP engines are aftermarket V-twin engines made by the Connecticut-based Total Performance Engineering. The displacements of these engines range from 114” to 124” while their power averages about 94-122 HP.
If you want to find out more about these popular power mills, this post is for you.
We at PowerSportsGuide have compiled all you need to know into this TP engine review!
What is a TP Engine?
TP engines are big-block V-twin motorcycle engines produced by TP (Total Performance) Engineering. The Connecticut-based company is a reputable manufacturer of aftermarket V-twin motorcycle engines, transmissions, and parts.
The majority of these products are designed for Harley-Davidsons, but they are commonly used by the custom motorcycle industry as well.
Besides these complete bolt-in engines, TP Engineering produces unique Pro-Series engine components including patented TP Classic and Smart Oil Pumps, Scramjet Air Cleaners, Forged Roller Rocker Arms, and the patented Pro-Vent Rocker Boxes.
These components are compatible with both Harley Twin Cam and Evo engines.
Where are TP Engines Built?
TP engines and components are proudly manufactured and assembled in the US, using the best American materials supplied by US companies. TP Engineering is located and headquartered in Danbury, Connecticut.
TP Engine Reviews
As the name suggests, TP (Total Performance) engines are built for performance and durability. These large-displacement V-twin power sources are designed to fit into Evo-style Harley frames.
TP engines are available in three different sizes, which are as follows:
- TP 114” – 94/113 HP
- TP 121” – 100/120 HP
- TP 124” – 105/122 HP
Each engine is available in Performance and Emission Compliant configurations as well. The latter is designed to meet California ARB and US EPA standards for noise and exhaust emissions.
This means that they are completely street-legal in any state, but as a side effect, they produce less HP and torque.
In contrast, the Performance variations produce significantly more power but are only allowed to be used in closed courses.
All engines come with several advanced features, including:
- Pro-Series Remote single-fire ignition
- TP’s exclusive MegaTorque intake port
- Detonation-free combustion chamber
- Adjustable pushrods
- Forged coated pistons
- Patented Pro-Vent chrome billet rocker boxes
- 7075-T6 billet lifter blocks
- Pro-Series forged steel roller rocker arms
- Patented Pro-Series Smart oil pump
- Push-button compression releases
- Scramjet air cleaner
- 45mm Mikuni carburetor
- 2” Intake valve diameter
- 1.625” exhaust valve diameter
Two of the key advantages of these engines are their TP-exclusive MegaTorque intake port and the unique detonation-free combustion chamber. These innovative features increase the usable power in each RPM range, which results in a stronger throttle response and smoother power delivery.
Besides their great performance and quiet operation, TP engines are also known for their high-quality looks. Choices of finishes include natural, polished, polished diamond cut, and powder coated.
Let’s drill into the details and talk about TP engines in detail!
1. TP 114” Engine Review
The TP 114” is the entry-level engine in the lineup.
It features a 4.125” bore and 4.250” stroke, which translate to 114 cubic inches or 1860 cubic centimeters.
This power source puts out 94 HP in the “Emissions Compliant” and 113 HP in the Performance” configuration.
The key specifications of the TP 114” engine are as follows:
| Specs | TP 114″ Emission Comp. | TP 114″ Performance |
| Bore (“) | 4.125 | 4.125 |
| Stroke (“) | 4.25 | 4.25 |
| Displacement (cc) | 114 | 114 |
| Displacement (cu in) | 1860 | 1860 |
| Intake Valve Diameter (“) | 2 | 2 |
| Exhaust Valve Diameter (“) | 1.625 | 1.625 |
| Intake Duration @ 0.053 | 220° | 262° |
| Exhaust Duration @ 0.053 | 232° | 266° |
| Valve Lift Intake (“) | 0.516 | 0.630 |
| Valve Lift Exhaust (“) | 0.516 | 0.630 |
| Horsepower @ 5,500 RPM | 94 | 113 |
| Torque @ 3,900 RPM | 111 | 121 |
| Shipping Weight (lbs.) | 184 | 184 |
2. TP 121” Engine Review
The TP 121” is the mid-sized complete V-twin engine in the company’s offering.
As far as specifications go, this power mill has a 4.125” bore and a 4.500” stroke, which equals 121 cubic inches or 1975 cubic centimeters.
The TP 121” puts out 100 HP in the “Emissions Compliant” and 120 HP in the Performance” configuration.
The key specifications of the TP 121” engine are as follows:
| Specs | TP 121″ Emission Comp. | TP 121″ Performance |
| Bore (“) | 4.125 | 4.125 |
| Stroke (“) | 4.5 | 4.5 |
| Displacement (cc) | 121 | 121 |
| Displacement (cu in) | 1975 | 1975 |
| Intake Valve Diameter (“) | 2 | 2 |
| Exhaust Valve Diameter (“) | 1.625 | 1.625 |
| Intake Duration @ 0.053 | 220° | 262° |
| Exhaust Duration @ 0.053 | 232° | 266° |
| Valve Lift Intake (“) | 0.516 | 0.630 |
| Valve Lift Exhaust (“) | 0.516 | 0.630 |
| Horsepower @ 5,500 RPM | 100 | 120 |
| Torque @ 3,900 RPM | 120 | 125 |
| Shipping Weight (lbs.) | 184 | 184 |
3. TP 124” Engine Review
The TP 124” is the flagship model in the engine fleet of TP Engineering with a displacement of 124 cubic inches (2024cc).
This big-inch V-twin power source offers 105 HP in the “Emissions Compliant” and 122 HP in the Performance” configuration.
The key specifications of the TP 124” engine are as follows:
| Specs | TP 124″ Emission Comp. | TP 124″ Performance |
| Bore (“) | 4.125 | 4.125 |
| Stroke (“) | 4.625 | 4.625 |
| Displacement (cc) | 124 | 124 |
| Displacement (cu in) | 2024 | 2024 |
| Intake Valve Diameter (“) | 2 | 2 |
| Exhaust Valve Diameter (“) | 1.625 | 1.625 |
| Intake Duration @ 0.053 | 220° | 262° |
| Exhaust Duration @ 0.053 | 232° | 266° |
| Valve Lift Intake (“) | 0.516 | 0.630 |
| Valve Lift Exhaust (“) | 0.516 | 0.630 |
| Horsepower @ 5,500 RPM | 105 | 122 |
| Torque @ 3,900 RPM | 125 | 130 |
| Shipping Weight (lbs.) | 184 | 184 |
TP Engine Specs Chart
For a better comparison, we’ve compiled the key specifications of TP engines into one chart:
| Specs | TP 114″ Emission Comp. | TP 114″ Performance | TP 121″ Emission Comp. | TP 121″ Performance | TP 124″ Emission Comp. | TP 124″ Performance |
| Bore (“) | 4.125 | 4.125 | 4.125 | 4.125 | 4.125 | 4.125 |
| Stroke (“) | 4.25 | 4.25 | 4.5 | 4.5 | 4.625 | 4.625 |
| Displacement (cc) | 114 | 114 | 121 | 121 | 124 | 124 |
| Displacement (cu in) | 1860 | 1860 | 1975 | 1975 | 2024 | 2024 |
| Intake Valve Diameter (“) | 2 | 2 | 2 | 2 | 2 | 2 |
| Exhaust Valve Diameter (“) | 1.625 | 1.625 | 1.625 | 1.625 | 1.625 | 1.625 |
| Intake Duration @ 0.053 | 220° | 262° | 220° | 262° | 220° | 262° |
| Exhaust Duration @ 0.053 | 232° | 266° | 232° | 266° | 232° | 266° |
| Valve Lift Intake (“) | 0.516 | 0.630 | 0.516 | 0.630 | 0.516 | 0.630 |
| Valve Lift Exhaust (“) | 0.516 | 0.630 | 0.516 | 0.630 | 0.516 | 0.630 |
| Horsepower @ 5,500 RPM | 94 | 113 | 100 | 120 | 105 | 122 |
| Torque @ 3,900 RPM | 111 | 121 | 120 | 125 | 125 | 130 |
| Shipping Weight (lbs.) | 184 | 184 | 184 | 184 | 184 | 184 |
Disclaimer: These charts are for informational purposes only! For more information, please check the official factory manuals!
Takeaways – FAQs About TP Engines
As a takeaway, we’ve answered the most frequent questions about TP engines!
What is a TP Engine?
TP engines are aftermarket big-inch V-twin motorcycle engines manufactured by Total Performance (TP) Engineering.
Are TP Engines Made in the US?
Yes, TP engines are manufactured and assembled in the US since the company is located and headquartered in Danbury, Connecticut. What’s more, each part of these amazing engines is made with the finest American materials supplied by US companies.
Yes that’s right, TP Engineering doesn’t rely on outside sources, but manufactures every single part in-house.
If you are looking for an authentic US-built V-twin, a TP engine is for you!
What Size Motors does TP Engineering Make?
TP Engineering offers three different engines in sizes: 141”, 121”, and 124”.
Which TP Engine is the Biggest?
The biggest TP engine is the TP 141” with a bore of 4.125” and a stroke of 4.625”.
How Much Horsepower Does a TP Engine Have?
The HP rating of TP engines depends on their size and configuration, but it ranges from 94 up to 122 HP.
To be more precise, the HP figures for TP engines are as follows:
| Engine | Horsepower @ 5,500 RPM | Torque @ 3,900 RPM |
| TP 114″ Emission Comp. | 94 | 111 |
| TP 114″ Performance | 113 | 121 |
| TP 121″ Emission Comp. | 100 | 120 |
| TP 121″ Performance | 120 | 125 |
| TP 124″ Emission Comp. | 105 | 125 |
| TP 124″ Performance | 122 | 130 |
Is TP a Harley Engine?
Contrary to popular belief, TP engines are not made by Harley-Davidson. Instead, TP Engineering is an aftermarket motorcycle engine manufacturer offering engines for Harley-Davidsons as well as custom motorcycles.
How do You Know Which TP Engine You Have?
You can identify a TP engine based on the serial number stamped on the side of the engine. Just locate the number and call the manufacturer, and they will likely help you identify your engine.
How Much Do TP Engines Cost?
As a rule of thumb, the prices of TP motorcycle engines range from $8,000 up to $9,000.
Is TP Still in Business?
Yes, to the delight of many fans, TP (Total Performance) Engineering is still in business! You can read more about and contact the manufacturer here.
How Much Does a TP Engine Weigh?
TP engines weigh 184 pounds.
Are TP Engines Any Good?
TP engines are known for their high quality and durability, which makes them widely popular among riders!
References
