Larry Carley, Author at Engine Builder Magazine - Page 5 of 24
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Keep the Valvetrain on Track

The key to choosing the right valvetrain components is to match the parts to the application. It sounds simple enough, yet many valvetrain component suppliers tell us there are a lot of misconceptions about what kind of parts are best for different kinds of performance applications.

Connecting Rods

They say an engine is only as reliable as its weakest link. The connecting rods that join the pistons with the crank can be a strong link or a weak link depending on the rods that are used.

Sourcing Engine Blocks

Production engine builders today want engine cores that match a very specific vehicle application. In many cases, they also want the tinware that goes with the engine because the oil pan, valve covers and timing cover are also year, make and model specific. That has changed the way core suppliers have to inventory their stock.

Carburetor and EFI Conversions

Carburetors have long served the performance aftermarket and racing industry well. Although they disappeared from new vehicles back in the late 1980s to meet emission requirements, it was only a couple of years ago that NASCAR finally abandoned carburetors in favor of fuel injection.

Motor Oil Issues

One of the challenges of building engines for a living is making sure that every engine you build has good oil pressure and suffers no lubrication-related issues once it goes out the door. Good oil pressure requires main and rod bearing clearances that are within your target specs for the application, a good oil pump and the “right” motor oil.

Diesel Performance Head Gaskets

The stock head gaskets that are used in most light truck diesel engines are robust enough to handle peak combustion pressures in the 1800 to 2200 PSI range, but may not do so well at higher pressures if the engine has been tweaked to produce more power.

Camshaft Selection and Design

Choosing the right cam from all of the possibilities that are out there can make a significant difference in how well an engine performs. It’s all about balance and correctly matching the cam with the cylinder heads, compression ratio, intake and exhaust systems, and RPM range where you want the engine to produce the most torque and horsepower.

Vanishing V8s: Downsizing Engines

The V8 isn’t dead yet, but storm clouds are brewing on the horizon. Concerns over global warming, CO2 emissions and dependence on foreign oil led the EPA to mandate new Corporate Average Fuel Economy rules. To achieve 54.5 miles per gallon by 2025, automakers may abandon the V8 altogether or restricting it to a handful of limited production applications.

Choosing the Right Oil Pump

Choosing a replacement oil pump for an engine you are building or modifying is a process that requires some thought. Original equipment oil pumps are usually adequate for most stock applications – but some are not, especially if an engine is being modified.

Building for Biodiesel

Some people have a negative view of biodiesel. They say it gums up the fuel pump and injectors. They say it gels in cold weather. They say it’s diverting food resources to make fuel. They say it’s too expensive and can’t compete economically with conventional No. 2 diesel fuel. Then they hear that diesel engines burning biodiesel are winning pulling championships, drag races and setting new land speed records. Maybe biodiesel isn’t so bad after all.

High Performance Diesel Crankshafts, Connecting Rods & Pistons

Most stock Cummins, Duramax and Power Stroke engines can safely handle cranking up the turbo boost to produce 500 to 600 or more horsepower. But once you get to get up around 700 to 800 horsepower in an otherwise stock motor, things start to break and upgrades will be necessary.

CNG and Propane Engine Builds

Building engines for a living means building whatever a customer wants. With a growing market for alternative fuels you might find yourself building an engine for a customer who wants his engine to run on compressed natural gas (CNG), liquefied natural gas (LNG) or propane (liquefied petroleum gas or LP).