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Free shipping over $100 · USA & Canada
Free shipping over $100 · USA & Canada
3.900" Tapered Ring Compressor | Piston Installation Tool | Engine Assembly Tool | 6061 Aluminum | RF009

Tapered Ring Compressor

3.900 in bore

PART # RF009

$36.28 - $36.28
$36.28
$36.28 - $36.28
$36.28
Availability:
in stock, ready to be shipped
1-Year Limited Warranty
Free shipping is available on orders over $100 shipping to the USA or Canada.
High-Strength 6061 Aluminum

Built from premium aerospace-grade material for impressive durability and corrosion resistance, ensuring a long service life in tough workshop conditions.

Smooth, Tapered Interior

Precisely angled to guide piston rings into the cylinder bore with minimal friction, helping to prevent ring damage and save valuable installation time.

Precision Machined

Engineered with tight tolerances for a consistent, snug fit that delivers reliable compression and professional-grade performance on every job.

Lightweight & Easy to Handle

Weighing significantly less than steel alternatives, this user-friendly tool reduces fatigue and boosts efficiency during extended engine assembly tasks.

Available in Multiple Sizes

Choose the ideal dimension for your specific engine project, making this tapered ring compressor a versatile solution for both DIY enthusiasts and professional mechanics.

Your application

Match your finished bore.

Choose the compressor for the measured finished cylinder bore. Check the piston and ring specifications for your build.

Size3.900 in bore

For a matching 3.900-inch cylinder bore. Verify the finished bore size, piston and ring compatibility, and available deck access before use. This is a fixed-size tool, not an adjustable compressor.

3.900" Tapered Ring Compressor | Piston Installation Tool | Engine Assembly Tool | 6061 Aluminum | High-Performance Engine Building

Inside the box

Know exactly what arrives.

Included components for this product.

QtyComponent
1 3.900 in Tapered Ring Compressor
One fixed-size aluminum sleeve for guiding piston rings into a matching cylinder bore.

Engineering details

A taper that guides the rings.

The wider entry guides the piston and rings into a narrowing passage. As the piston moves through, the taper compresses the rings toward the cylinder bore.

How a tapered sleeve guides piston rings Simplified cross-section showing piston rings entering a tapered compressor sleeve aligned with the cylinder bore. The piston, rings and engine block illustrate use and are not included. PistonPiston ringsTapered sleeveCylinder bore
Simplified cross-section. Piston, rings and engine block shown for context.

Smooth tapered interior.

A continuous taper guides the piston rings toward the bore-sized outlet.

6061 aluminum body.

Precision-machined aluminum keeps the tool lightweight and easy to handle during assembly.

A fixed-size tool.

This compressor is sized for a 3.900-inch bore. Check the finished bore and the piston and ring specifications for your build.

Before you order

How do I choose the correct size?

This tool is sized for a 3.900-inch cylinder bore. Match the compressor to the measured finished bore and check the piston and ring specifications; engine displacement alone does not identify the correct size.

Is this compressor adjustable?

No. This is a fixed-size tapered compressor. Other bore sizes are sold as separate products.

What is included?

One tapered ring compressor. Pistons, piston rings and other engine components are not included.

Does this replace the engine assembly checks?

No. Follow the piston, ring and engine service specifications for clearances, preparation and installation.

What warranty is included?

This tool carries a one-year limited warranty from the date of purchase, subject to XOTIC PERFORMANCE’s warranty policy.

California Proposition 65 warning

WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov

From our customers

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1,637reviews across XOTIC
4.83 / 5
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