High Performance Rocker Arms, Valve Springs, Retainers and Locks
On a small block Chevy, altering the rocker arm geometry without changing the rocker arm lift ratio can add 15 to 20 horsepower at the rear wheels. The stock lift ratio for a small block (SB) Chevy V8 rocker arm is 1.5:1, and for a big block (BB) Chevy V8, the ratio is 1.7:1. Bolt-on
Crack Detection
Take a look in the mirror. Smiling back at you, you’ll notice that row of pearly whites. They probably look pretty good. Maybe a bit stained from coffee or smoking, but overall, they seem to be pretty solid, right? If you’re like many people, the fear sets in as soon as you sit down in
Shop Line
Q: I have experienced problems with blowing oil filter seals off some 4.2L Ford engines. Any solutions? A: The AERA Technical Committee offers the following information regarding high oil pressure on 1997-2004 Ford 4.2L VIN 2 engines. This condition occurs immediately after engine front cover/oil pump replacement. In some instances, this higher than normal pressure
Timing Chain Selection: And a look at ‘new’ and ‘how to’
The simple timing chain: it has a distinct function, yet constantly changing designs, materials, procedures and refinements make for a part that seems to evolve by the month. With such changes going on, how do we know what chain and gears are the best to use on a particular engine? When the automobile was invented,
Pistons and Pins: What’s New
Asking piston manufacturers “what’s new” reveals a number of trends that are reshaping the piston business today. One is that there’s no longer a time lag of three or four years for aftermarket piston suppliers to tool up for the latest piston applications. Production engine remanufacturers (PERs) and custom engine rebuilders (CERs) are asking for
Performance Notes, How To Compete With The Crate Motor Business
If you are a regular reader of the performance automotive consumer magazines you may have spotted a trend – many of the feature cars and tech articles are focused on crate motors. To an engine builder specializing in custom high performance engines, and for engine builders looking to get into the performance arena, this could
Performance Cylinder Sleeves
In the performance segment of the automotive aftermarket, young enthusiasts often think only the latest is great enough for their vehicle. Thanks to the prevalence of computerized engine management systems, some might believe that high-tech guarantees high horsepower. Yesterday’s technology? No way will it find success on the street or strip. However, engine builders know
High Performance Piston Rings and Cylinder Finishes
Today’s performance ring sets are thinner, lighter and more conformable than ever before. Thinner, low-tension rings reduce friction for more usable horsepower. Less weight reduces ring groove pound out. Narrower rings also allow tighter tolerances and less blowby. All very good things when you’re building a performance engine. But they also require rounder, straighter cylinder
Engine Bearings and Crankshafts, What makes them [not] tick?
The relationship between the crankshaft and main bearings is an integral one. Any metal-to-metal contact can have catastrophic results, and if the carnage was the result of improper finish or fitment, you’ll likely get to work on your relationship skills again. There are many analogies to explain how its parts relate to the engine as
Coretalk: Tony Stewart Motorsports To Headline SME Show
Stewart’s personal race team, which is a passion for the versatile NASCAR, IndyCar and USAC champion, will be featured on the show floor on January 24-25 at the Performance Theater. “The competition level is so tight right now – any extra bit of speed or performance you can squeeze out of your car can be
Valve Selection: Hot Valve Materials for Hot Engines
Are stock valve materials good enough, or do you need to upgrade to valves that are made of a more durable alloy? If so, what kind of alloy? These are questions every engine builder must answer when selecting valves for performance engine applications. To the naked eye, most valves look pretty much the same. Unless
What Are The Costs?
In the equipment industry, it’s a similar situation. Change and development have been furious. Advancements in technology have made nearly every step of the rebuilding process more exact than ever, which has made it easier for shops to meet the ever-tightening tolerances and reach OE specifications. But these advancements haven’t come without their costs, both
Which Cranksfaft Meets Your Racing Needs Best?
There are a lot of racing crankshafts in the automotive aftermarket today. You’ll find a wide variety of styles, strokes, weights and price ranges from which you can choose. The question you need to be asking is which crank is “right” for the engine you’re building? The answer to that question depends on several things
Head Gaskets – Sealing the Engine
Sealing an internal combustion engine has never been easy. In the last 100 years gasket manufacturers have tried many things, including paper, leather and even beef tallow, to try and seal the joint between the head and block. Today, engine leaks are not what they used to be but can still be quite a headache
Cylinder Head Crack Repairs
It seems as if many cylinder heads are doomed to crack from the very start because of their lightweight construction and design. Aluminum overhead cam (OHC) heads, in particular, are often found to be warped as well as cracked. But so too are many pushrod cast iron heads. One of the causes of cracking in
Coretalk: Pentagon 9/11 Survivor To Keynote PERA Convention
After American Airlines Flight 77 crashed into the Pentagon, very close to his second floor office, LTC Birdwell was thrown to the ground and engulfed in flames. Of the burns that consumed 60 percent of his body, nearly half were third-degree burns. With more than 30 operations and months of multiple skin grafts and burn
Coretalk: Recon Automotive Founder Armand J. Mancini Dies
He leaves behind his wife of 42 years, Carole, and three sons and a daughter – Armand, Vincent, Daniel and Carrie Mancini Young. He is also survived by three brothers, a sister and six grandchildren. Mancini was an icon of the automotive remanufacturing industry, having founded Recon in 1973 and building it into one of
Performance Pistons
Piston manufacturers are introducing new performance pistons for all of these applications as well as refining existing piston designs to reduce weight, and improve strength, durability and ring sealing. Piston design and manufacturing used to be a relatively low-tech process. Now, with the aid of finite element analysis and other computer modeling techniques, many aftermarket
Gen III GM Small Block Engine, LS1 Motor for Cars, Trucks
The first generation small block was revised to create the second generation LT1/LT4 that was used for some applications from ’92 to ’97, but the results didn’t satisfy the people at GM Powertrain, so they started all over in ’91 and designed a brand new small block. It’s officially called the “Gen III” motor, but
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