Crankshafts:Stock and Performance
The crankshaft is the working arm of the engine. All the force generated by combustion and the downward motion of the pistons is focused on the crank throws. The leverage effect of the force exerted on the crank journals twists the shaft and converts the up-and-down reciprocating motion of the pistons into rotational motion of
Engine Bearings: Stock & Performance
The importance of the engine’s bearings can’t be over-emphasized. The bearings support the crankshaft and connecting rods, and in pushrod engines also the camshaft. The bearings provide a surface for the friction-reducing oil film that allows the parts to spin without rubbing metal against metal. It’s a tough job because of the high loads created
Tech Notes
Engine Builders: The AERA Technical Committee offers the following information regarding harmonic damper loosening, key shear and crankshaft damage on 1992-2002 GM 6.5L diesel engines. This condition has been reported on engines that have been in service a long time as well as engines shortly after re-installation of the harmonic damper. In some instances, over
Surfacing Equipment Options
On older cast iron engines with conventional soft-faced head gaskets, as long as the surface finish on the cylinder head and block deck is roughly 60 to 100 microinches Ra (roughness average), the head gasket should cold seal and remain leak-free for the life of the engine. But on late model bimetal (aluminum head/cast iron
Engine Balancing
In the dark ages of the automotive industry, engine balancing was considered an art practiced exclusively by performance engine builders. Only those wizards of speed (it was widely believed) could understand the forces that caused drivetrain vibration – and more importantly, those that stopped it. Those few who could balance an engine were looked upon
Rebuilding The Chrysler 2.7L
It was rated at 200 HP and it was originally used as the base motor in the Intrepid and Concorde, but it’s been the optional engine in the Stratus and Sebring since 2001 and it will be the standard engine in Chrysler’s new 300 sedan that’s coming out later this year. So, while there are
Surfacing Equipment For Today’s Engines
The surfacing needs of today’s engines are as complex as the engines themselves. Multi-valve aluminum cylinder heads on cast iron blocks are a tough combination to seal because of the difference in expansion rates between the two metals. If the surface finishes on the head and block are too rough, lateral shearing forces which occur
Coolant contamination of engine oil for 1996-2003 GM 3.1L or 3.4L VIN J & E engines
Engine Builders: The AERA Technical Committee offers the following information regarding coolant contamination of engine oil for 1996-2003 GM 3.1L or 3.4L VIN J & E engines due to failure of the intake manifold gasket. GM has redesigned a new intake manifold gasket (p/n 89017279) to reduce the chance of failure. The material used in
Rebuilding the Chevrolet LT1 Engine
Compared to the 1991 Chevy 350 L98 with TPI, the LT1 made 20 percent more horsepower, got better fuel mileage, and had a much broader torque band with 90 percent of its peak torque available from just over 1,000 rpm all the way up to nearly 6,000 rpm. GM Powertrain accomplished all of this by
Rebuilding the Chevrolet LT1 Engine
Although it shared many common dimensions, looked much the same and even had a few common parts, it was totally redesigned to provide more power with lower emissions and better fuel economy. Compared to the 1991 Chevy 350 L98 with TPI, the LT1 made 20% more horsepower, got better fuel mileage, and had a
Understanding Alternator Current Output
The amount of electronic and electrical equipment in today’s cars has increased exponentially over the past decade and we can look forward to even more in the near future. The demands for electrical power are increasing and, consequently, greater output currents are needed from the alternator. In this article, we will examine what determines the
Performance Marine Engines – Meeting Customer Expectations
Life is a series of compromises. Human relations almost alwaysinvolves compromises of some sort. You want Chinese for dinner,she wants Italian; something has to give. Even if you go yourseparate ways, it’s a compromise and a decision to not dine together. Believe it or not, it’s the same with machinery. Any exercisein design is a
Ford’s 4G Alternator: IAR Series & The New 4G
When one considers the Ford IAR series of alternators,then examines the new 4G alternator, it seems that Ford went overboardto correct all the problems with the IAR series. The IAR series was designed for rapid assemblyand disassembly with plenty of snap-on connectors and mountinghardware. With this design approach came problems, particularlywith the burnt out B-S-S
Brakes Market: Brake Rebuilders Have No Intention Of Slowing Down
Despite a few bumps in the aftermarket roadto success, brake rebuilders have no intention of slowing down.Some brake industry professionals say that demand in the brakerebuilding market is pretty consistent compared to last year. "The market (in sales) seems to be following the same patternsas last year," said Steve Suber, friction materials managerfor EIS Brake
Performance Small Block: Chevy Engines
Small block Chevy engines long ago became mainstays in both thetraditional and high performance marketplace. So many of themhave been rebuilt over the years, and so much has been writtenabout the rebuilding process, it would appear that nothing moreneed be said. But the small block engine has changed over the years and so haveconsumer preferences
Shot Blasting Equipment Maintenance: Simple Does Not Mean Maintenance-Free
The technology of hurling steel or glass shot at more than 100 mph is pretty simple. But in the world of shot blasting machines, simple does not mean maintenance-free. The essence of these machines, no matter what their design, is that clean core parts come at the price of dramatic wear-down of media, as well