Alp Racing Engines

"Vintage Triumph Pre Unit"

Our high performance Pre-Unit Triumph engines are built for racing purposes. We build specific engines for specific Land Speed Racing classes. These are the most powerful LSR engines ever built on a Triumph pre-unit platform.

These engines can come with our Land Speed Racing frame and all the required components to achieve what you are aiming for. Our Triumph pre unit construction

frame is designed according to our high performance engines and are a big part of our success.

Parallel twin British Motorcycles are known for vibration, especially the vintage pre unit Triumph rigid frame. After many race and test runs we've figured out the best frame geometry and the perfect engine balance factor.

All our crankshafts are specifically balanced to our standards according to the frames they will be used in.

The smooth revving Triumph pre unit engine is key to efficient performance. The results speak for themselves!

Contact

Alp Sungurtekin Pre unit Triumph Engine Rebuild

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Alp Racing & Design 650 Vintage Class "Pre 56" Engine Specs:

OEM Pre-unit Triumph 6T Crankcases
MAP Connecting rods
OEM Triumph crankshaft, modified and balanced by Alp Sungurtekin
OEM Cast Iron Barrels
2.795" bore, 3.23" stroke
Original Hepolite pistons modified and balanced by Alp
13:1 compression ratio
OEM 1950 Triumph 6T iron head, ported/optimized by Alp
OEM pre unit oil pump.
Modified oiling system by Alp
BNR Primary drive and clutch
Dual Amal 32mm Concentric Carburetors or 1-3/8" Dual Amal GP's
Morris Magneto
Pre unit gearbox std ratio
On 110K Racing Gas 60+ Horsepower.
On 98% Nitro-methane 150 Horsepower estimated
Top speed 141mph Gas
Top speed 180mph Fuel - 09/17/2018 Bonneville "World of Speed"
1950 Triumph Frame 1952 Triumph Ironhead engine class M/VF 650

Alp Racing & Design 650 Pushrod Class Engine Specs:

Thunder Engineering Triumph pre unit crankcases and rods.
OEM Triumph crankshaft, modified and balanced by Alp Sungurtekin
Triples Rule Barrels, Custom made 650cc with plain cast iron sleeves from Northwest Sleeve.
2.795" bore, 3.23" stroke
Robins pistons modified and balanced by Alp
13:1 compression ratio
OEM 1964 Triumph T120 cylinder head, ported/optimized by Alp
OEM pre unit oil pump.
Modified oiling system by Alp
BNR Primary drive and clutch
Dual Amal GP 1-3/8 Carburetors
Morris Magneto
Pre unit gearbox std ratio
On 98% Nitromethane
150 Horsepower estimated. Top speed 175mph - 11/14/2015 El Mirage, CA SCTA class A/PF 650

Alp Racing Engine's Records Documentation & Certification HERE

Pushrod & Vintage Class Engine Rules HERE

VIDEO of the 175.625MPH Record run at El Mirage, CA

Ironhead Triumph Pre Unit Rocke Box Rebuild

Stage 3 Full Racing cylinder head for the SCTA & AMA Vintage LSR classes. 1950 Triumph 6T cast iron ports welded/brazed and flow optimised for dual GP's. This is the cyl. head & configuration that achieved the record speed of 169.936MPH at its first run right after built by Alp at the El Mirage dry lake in July 2016	Testing mechanical fuel injection pre unit engine for client. Top speed 172MPH	Optimising ironhead ports, Stage one (without pre welding)
alp r-d honing cylinder guides on a ironhead		Specs Book
Precision Honing .0001" Mitutoyo	Modifying Triumph 650 Crankshaft	Modifying Triumph 650 Crankshaft
The Devil is in the detail!	Alp's Engine Workstation	Alp's Engine Workstation
Alp's Engine Workstation	Alp's Engine Workstation	Balancing Connecting Rods
Long Nights	The perfect X	Verifying Deck Surface
Verifying Compression Ratio	Checking Valvetrain	Piston to Valve Clearance
Verifying Piston to Valve Clearance	Thunder Engineering Crankcases and Connecting rods that we use in the Pushrod Fuel Class
Amal Carburetors from Burlen Fuel	AMAL GP's and Matchbox Fuel Floats	Top Fuel Pre Unit Engine
Pre unit engine with Monoblock Carbs	650 pre unit engine Monoblock carbs side view	1956 Pre Unit Cylinder Head with Rocker Boxes
Pre Unit Gearbox Rebuild	Getting Ready for the Next Race