DICTIONARY OF AUTOMOTIVE TERMS - "Ib"

I-beam

A steel beam that is shaped like the letter I when you look at the cross section

I-beam suspension

A suspension which uses an I-beam. The wheels on opposite sides of the vehicle are linked by a solid member, usually an I-beam but sometimes a tube. This minimizes the pieces needed for the suspension, but weighs slightly more, so is seldom used on high-performance vehicles. It was most common on older car front suspensions, but is now most commonly used on the rear of front-wheel-drive vehicles.

Also See
Twin I-beam suspension

I-beam axle

See
Rigid axle

IBP

1. Acronym for Integral Back Pressure
2. Acronym for Initial Boiling Point. In a standard laboratory distillation, the temperature on the distillation thermometer at the moment the first drop of distillate falls from the condenser.