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Cummins Conversion Basics

Cooling Hoses

Posted by Eric Rego on

In some instances, it will be required to reduce the ID of a hose to make a transition. For these instances, special rubber reducers are available from Gates that slip inside a hose and act like a “bushing,” effectively reducing the ID. The table included at the bottom of this article shows what ID reducer options are available.   Another option is to use a transition hose to step up or down a hose size. This option can work well especially if additional length is needed to make connections. Popular Gates transition hoses are also listed in this article.   We've also...

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Cooling Fans/Fan Drives

Posted by Eric Rego on

For this edition, we will be covering cooling systems and how to adapt a Cummins B series engine to an existing radiator. Often when engineering a cooling package, the complete package is engineered as a system. That is, the interaction between the fan, shroud, and radiator is optimized to minimize power consumption and noise and provide proper cooling under adverse conditions. To demonstrate this point, we can simply look at the fans used on the Cummins powered White American and 100 series tractors. Each model of tractor used a different fan that was optimized for each engine's specific heat rejection...

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Accessories (Tach Drives, Starting Aids, A/C)

Posted by Eric Rego on

Tachometer Drives   When using a mechanically driven tachometer, parts are available both from CaseIH and Cummins for a B series engine to allow such a tachometer to be driven.  This tachometer drive is installed into the front timing gear cover and is a 90 degree drive (total speed reduction relative to crankshaft speed is 2:1).  In some situations, a longer tach drive cable will be required to reach the drive.  The cable from a White 2-135/155 is a good option when additional cable length is needed to reach the tachometer drive. The  mechanical tachometer drive shown installed on the...

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Charge Air Cooling

Posted by Eric Rego on

Charge air cooling is an important topic especially with higher horsepower B series engines. Often people will look at a pickup truck rating and question why charge air cooling is needed when pickup engines were not equipped with charge air coolers even at 175+hp. The answer lies in an engine's expected duty cycle and design life.   Charge air cooling not only helps deliver a denser charge as a part of the recipe for higher engine output, but can also increase an engine's durability. Cooler intake air translates into cooler combustion temperatures and ultimately cooler running internal engine components. With...

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4BT Conversions

Posted by Eric Rego on

Occasionally a question comes up regarding using a Cummins 4B four cylinder engine for a conversion.  In addition to having a shorter length, which places the engine a notable distance from the radiator, the other issue with 4 cylinder engines is engine vibration.  Inline four-cylinder engines have an inherent vibration that occurs every half crank revolution and attempts to shake the engine up and down. This is known as a second order vibration that originates from the fact that the rate of acceleration and deceleration of a piston when it is near top dead center is different than the acceleration...

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