Feuling Tech Articles


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Feuling Tech #1
Iron Works Magazine
Complete Camchest Kit installation

Feuling Tech #2
American Bagger Magazine
Camshaft, Valve Spring & Oiling System Installation

Feuling Tech #3
Hot Bike Baggers Magazine
Oiling System Basics

Feuling Tech #4
Iron Works Magazine
Oil cooler installation

Feuling Tech #5
Hot Bike Magazine
Complete Camchest Kit installation

Feuling Tech #6
U.S. Standard torque Values

Feuling Tech #7
Harley Cam Specs

Feuling Tech #8
Ozbike 574 cam install

Feuling Tech #9
Iron Works Magazine Pressure Testing Camplates

Feuling Tech #10
AMD Dealer About Feuling

Feuling Tech #11
Feuling Twin Cam Plate Testing Tool


Feuling Tech Memo


The TC-88 and TC-88B engines have a small, die cast, crank-speed gerotor style oil pump that utilizes a spring washer to preload the pump gears against the cam support plate and pump housing. The side loading from the spring washer can cause excessive friction and premature wear. 

The TC-88 engine uses a dry-sump lubrication system. To perform properly, the dry sump system requires a properly sized, BALANCED SYSTEM including a scavenge pump that is capable of removing all residual oil from the crankcase at all engine speeds and conditions. Failure of the scavenge pump to perform to these requirements causes “WET SUMPING.” Instead of returning to the oil tank, the oil builds up in the crankcase and cam chest causing excessive friction/power loss and oil aeration.  This can result in oil being forced out the breather, air cleaner contamination, oil leaks, loss of oil supply, lifter clatter, component wear and potential engine failure.

TC-88 engines have piston cooling jets that are designed to squirt oil on the under side of the pistons. These jets have a check valve that opens at approximately 25-28 PSI oil pressure.  Without adequate pressure pump volume this pressure regulated oil flow to the jets can short circuit critical oil flow from the lifters and top end.

Twin Cam valve springs need oil for cooling.  Inadequate oil flow can cause excessive valve spring temperature causing loss of spring tension resulting in noisy valve train separation and potential engine failure. Inadequate oil supply to the rocker boxes can cause excessive rocker arm bushing wear and component failure.

The Twin Cam® crankshaft has machined “paddles” on the periphery of the left flywheel to provide a trigger for the crank position sensor (CPS).  These paddles can whip up unscavenged oil in the crankcase, turning the oil into aerated frothing “peanut butter” that pushes its way up into the rocker boxes-out the breather, into the air cleaner and beyond!

Feuling® Oil Pump Corporation has high efficiency, billet, bolt-in replacement oil pumps for            T/C® engines that provide increased supply and scavenge volume over the stock oil pump. Large diameter gerotors, aerospace materials and tolerances create high efficiency pumps without the need for a high friction spring washer. The Feuling® Lifters, camplates, and pushrods are designed to optimize the Feuling® oil pumps creating a BALANCED SYSTEM resulting in cooler engine and oil temperatures, more HP and TQ. to the rear wheels.

Feuling’s® oil filter cooler is the ultimate in oil cooling and filtration technology. Combining an oil cooler and oil filter in one, used in conjunction with the stock spin on oil filter. Creating cleaner cooler oil!

The dyno-developed and track tested combination of Feuling® components will allow the Twin Cam® engine to provide maximum power, reliability and longevity.

The Feuling® products are THE solution!



3740 Oceanic Way, suite 304, Oceanside, CA 92056 Ph. 1-866-966-9767 Fax 760-487-1545


WARNING: Cancer -

NOTE: Some of FEULING's products: namely Camshafts, Valve-springs and High Flow Fuel Injectors ARE NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES. The following disclaimer is associated with these FEULING products. 



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