Comp Turbo Frequently Asked Questions

Table of Contents

Turbocharger Installation Guide
Turbocharger Installation Guide (Oil-Less Model)
Oil Feed, Drain, and Water Port sizes
Nomenclature
CT3B
Size Comparison
Turbocharger Size Sheets

Turbocharger Installation Guide

1. Bolt the turbine casing solidly to the exhaust manifold. The connection from the compressor casing to the air intake piping should be flexible.
2. The oil inlet piping should be short to minimize oil lag on startup and should be the following size,
   a. CT3B Ball Bearing should use -3 Oil line.
   b. CT360 Sleeve bearing should use -4 Oil line.
3. The oil drain should be short, slope downward over its entire length and have at least a ¾" inside diameter. Horizontal runs should be avoided.
4. The turbocharger must be supplied with filtered engine oil at between 35 and 50 psi pressure when the oil is up to temperature. Excessively high oil inlet pressure can cause oil leakage and smoke in the engine exhaust.
5. Air cleaner pressure drop should be no greater that 15" H2O and muffler restriction no greater than 1.5" Hg. If not air cleaner is used, a screen should be placed over the compressor casing air inlet to prevent entry of foreign material that can damage the compressor wheel.
6. All connections and flanged joints should be checked for leakage when the engine is running and engine oil and water are warm.

Turbocharger Installation Guide
(Oil-Less Model)

1. Bolt the turbine casing solidly to the exhaust manifold. The connection from the compressor casing to the air intake piping should be flexible.
2. Since this turbocharger does not require lube oil from the engine, it can be mounted in a variety of positions, including vertical.
3. This turbocharger contains a water jacket in its bearing housing and must be supplied with cooling fluid from the engine cooling system.
4. Air cleaner pressure drop should be no greater than 15" H2O and muffler restriction no greater than 1.5" Hg. If no air cleaner is used, a screen should be placed over the compressor casing air inlet to prevent entry of foreign material that can damage the compressor wheel.
5. All connections and flanged joints should be checked for leakage when the engine is running and the cooling fluid is warm.

Oil Feed, Drain, and Water Port sizes

CT2, CT3, CT4, and CT43
• Oil feed inlet size - 1/8" NPT
• Oil drain inlet size - 1/2" NPT
• Water Port size - 3/8" NPT

CT5 and CT6
• Oil feed inlet size- 1/8" NPT
• Oil drain inlet size- 3/4" NPT

Recommended Feed Line

CT2, CT3, CT4, and CT43

- 3 feed line
• Ball bearing with high oil pressure

- 4 feed line
• Ball bearing with low oil pressure
• Standard bearing

CT 5 & CT6

- 4 feed line

Nomenclature

Each of our turbocharger names' have been categorized by its respective housing size and wheel sizes.

Every turbo starts with the housing size then the compressor wheel size and the turbine wheel size.
CT#-####
CT# is the housing size we have CT2,3,4,43,5, and 6 sizes.
The next four numbers are the wheel sizes in millimeters.
The first two numbers are the compressor wheel size and the last two numbers are the turbine wheel size.
The compressor wheel is measured by the inducer diameter.
The turbine wheel is measured by the exducer diameter.

CT3B

CT3B stands for Comp Turbo Three Bearing, it is our Triplex Ceramic™ Ball Bearing system and it is on the seal plate on every ball bearing turbo.

Size Comparison

Our turbos are often compared with other manufactures like Garrett. Here is a chart on how each of our turbochargers matches in size with Garrett turbochargers