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We serve the VW parts and VW Tech needs of owners of aircooled VW Beetle, Volkswagen Bus, Karmann Ghia, Type 181 Thing, VW Type 3 Squareback / Fastback / Squareback, and Type 4 VW. Tech Tips, project advice, and quality parts for VW Restoration, VW Performance and Custom Aircooled VW projects.

VW Distributor Options

Choosing the Right Distributor for your VW

Aircooled VW owners have an assortment of options when choosing a distributor for their engine. If you only look on the surface it seems simple: The “obvious” choice is the Bosch 009, right? Not necessarily. Once you do a little research, you’ll find a variety of stock units (including the SVDA unit), as well as the Bosch 009, 010, and 050 series, and finally the Mallory, MSD, and the age old Magneto. So which one is “best”?

Each of these units is excellent – for the right application. In this article, I will clarify the right time and application for each option available. You can read the entire straight through, or skip directly to your area of interest using the quick links below:

Before we rush ahead, we are going to use some terminology, we may as well define
>>> Read Full Article

VW Carburetors 101: Carb Selection Options

VW Carburetor Options - VW Technical Article

Aircooled Volkswagen enthusiasts have quite a few carburetor options. Performance increases that can be gained by going with aftermarket carburetion are a common consideration, but without a little guidance, you can end up with nightmares associated with poor carburetor selection or poor tuning. In the aircooled VW hobby world, it is easy to get confused by the volume of available, and often times conflicting information. There are a number of aspects to consider when upgrading your fuel system and selecting the best set of VW carburetors for your engine and driving needs.

>>> Read Full Article

Running Nitrous Oxide in a VW

Nitrous oxide can be used in your VW engine to create more horsepower. All engines operate under the same principles: better breathing, plus more fuel in a denser vapor equals more power. Using nitrous is not a whole lot different from using a bigger carburetor, a better manifold, a supercharger, or a turbocharger — all are methods to increase the amount of oxygen available for combustion. The air you and your engine breathe is made up, at sea level, of 78% gaseous nitrogen, 21% gaseous oxygen, and just 1% other gases. Nitrous oxide (N2O) is a liquid created by chemically bonding 2 molecules of nitrogen and 1 molecule of oxygen. When the nitrous oxide goes into your engine, the heat of combustion breaks the chemical bond which releases the oxygen and makes it available in a relatively high gaseous concentration compared to the concentration found in normal air,
>>> Read Full Article

Synthetic Oil Explained

7/13/14 IMPORTANT UPDATE! Since this article was written, there have been a lot of changes with oils which we use in our beloved vintage aircooled engines. For a long time, one “insider trick” was to use a good diesel oil, like Delo 15-40, which had great anti-scuff properties, even for our gasoline engines. But as things progress, things change! You have to keep up with these changes, or you can pay a serious price. A couple years ago the formulation of diesel oils CHANGED, and they no longer offered the advantages they had previously for us!

At ACN we try to keep abreast of what people at the ground level (that’s you) are experiencing, with all sorts of products. We have been hearing reports of people running diesel oils running oil temperatures that were ~20F elevated from their “normal” temperatures for some time, and finally put 2 and
>>> Read Full Article

VW Engine Piston & Cylinder Operation

VW Piston and Cylinder Operation

Increase your VW Engine Power with Proper Piston, Cylinder, and Ring Operation The way that pistons, cylinders, and rings work together to support engine power is often misunderstood or mysterious to enthusiasts. But anyone who wants to get the most fun and drivability out of their VW engine should take the time to understand how pistons and cylinders operate in relation to the air flow through their engine system. Oxygen availability is a well known limiting factor in the combustive process. Maximize the volume of air and exhaust that can be moved through your VW engine, and you increase the potential for more power. Performance engine builders and do-it-yourself VW engine enthusiasts tend to focus on modifications designed increase airflow volume, or overall air capacity of their engine system. These modifications include cylinder head work, increasing camshaft size, improving carburetor intake/exhaust, running the engine at higher RPMs,
>>> Read Full Article

VW Carburetors 102: VW Carburetor Jetting

VW Tech Article - Basic Jetting Theory and Procedure

After springing for a set of carburetors, some people bolt them on, and are “pleased” with the results. Others are upset by a backfiring, or smoke belching monster. In either case, spending the time to properly jet a set of dual (or single) carburetors is a worthwhile task, since receiving “perfect out-of-the-box” carburetors is one of the biggest myths in the VW industry!

Proper jetting varies depending on engine size, elevation, cam overlap, etc. Jetting is so specific to an individual engine that two identical engine combos with the SAME carbs can even require different jets! The moral of the story is: With your engine combo, carb information and driving elevation, we can advise and get you CLOSE, but to know that your carbs are jetted optimally, you will need to spend the time necessary to dial it in. It IS worth doing for drivability, engine life, and
>>> Read Full Article

VW Engine Break In Procedure

VW Engine Break In Procedure - VW Tech Articles by Aircooled.Net

Many people do not understand the importance of the following the appropriate steps to prepare an engine to run for the first time. Following proper VW Engine Break In Procedure can mean a long life or fast death for a high VW performance engine. The information in this article can also be a useful guide to starting a VW engine that has been sitting for a long period of time, since it ensures proper oiling before the engine fires up.

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VW Performance Engine Building Considerations

Building a ‘Big’ Aircooled VW Engine (Type 1)

This article is a guide to the theory and choices involved in building performance engines for Aircooled VWs (Type 1). There are careful decisions to be made with regard to the engine size and components that are “right” for what you have in mind. The Beetle (and other Type 1 VWs) are fairly light cars. Relatively speaking, it doesn’t take a lot of power for you to really get moving! 140 HP will keep even the Mustang GT’s in your rear view mirror on the street, and 180 HP will eat Corvette’s and Vipers for lunch all day.

>>> Read Full Article