Busy Week at Dragonman's Machine Shop

Published on March 28, 2024
Duration: 12:43

This video showcases the extensive engine and transmission rebuilding services offered by Dragonman's Machine Shop, specializing in vintage Harley-Davidson models like Shovelheads, Panheads, and Knuckleheads. The instructor details various precision machining processes, including boring cylinders, rebuilding transmissions, balancing flywheels, installing custom valve seats, and modifying heads for dual spark plugs. The content highlights the shop's specialized equipment and the expertise gained over 57 years in business, emphasizing their ability to tackle complex repairs that other shops may refuse.

Quick Summary

Dragonman's Machine Shop offers expert rebuilding services for vintage Harley-Davidson engines like Shovelheads, Panheads, and Knuckleheads. They provide specialized work including cylinder boring to precise tolerances, transmission overhauls, flywheel balancing, custom valve seat installation, and case repairs, leveraging 57 years of experience and specialized machinery.

Chapters

  1. 01:00Introduction to Engine Rebuilds
  2. 01:05Shovelhead Lower End and Transmission Rebuild
  3. 01:22Cylinder Head Services and Rocker Rebuilding
  4. 01:45Transmission Rebuild Costs
  5. 02:12Flywheel Assembly Rebuild Service
  6. 02:47Knucklehead Motor Rebuild Details
  7. 03:17Cylinder Boring and Honing Process
  8. 03:33Valve Grinder Machine and Valve Jobs
  9. 03:44Automatic Honing Machine and While-You-Wait Service
  10. 04:07Piston to Cylinder Clearance Check
  11. 04:21Honing Machine Capabilities
  12. 04:38Connecting Rod Rebuilding Machine
  13. 04:56Turntable for Main Race Replacement
  14. 05:30Case Repair and Insert Installation
  15. 05:34Completed Engine Showcase
  16. 06:05Complete Motor Testing and Timing
  17. 06:10Seat Machining and Fixtures
  18. 06:40Jig for Harley-Davidson Heads
  19. 07:00Shovelhead Dual Spark Plug Example
  20. 07:16More Services Offered
  21. 07:18Shaving Flywheels Explained
  22. 08:42Shaving Cylinder Heads for Compression
  23. 09:08Achieving Higher Compression Ratios
  24. 10:00Balancing and Vibration Concerns
  25. 10:19New Jobs and Workflow
  26. 10:35Head and Boring Job Intake
  27. 10:49Evolution Motor Service
  28. 11:05Broken Front Engine Case Repair
  29. 11:18Shovelhead Seat Trimming Machine
  30. 11:35Case Machining Jig
  31. 11:53Machine for Spark Plug and Valve Guide Relocation
  32. 12:08Seat Cutting Machine with Digital Readout
  33. 12:22Conclusion and Business Overview
  34. 12:2657 Years in Business

Frequently Asked Questions

What specialized services does Dragonman's Machine Shop offer for vintage Harley-Davidson engines?

Dragonman's Machine Shop specializes in comprehensive rebuilding services for vintage Harley-Davidson engines, including Shovelheads, Panheads, and Knuckleheads. Services cover lower end rebuilds, transmission overhauls, cylinder boring, head work with custom valve seats, flywheel balancing, and case repairs, utilizing specialized machinery and expertise.

How does Dragonman's Machine Shop handle cylinder boring and honing for Harley engines?

The shop employs seven honing machines with a wide range of mandrels to achieve precise cylinder bore finishes. They use a dial indicator accurate to 1/10,000th of an inch to ensure exact measurements and proper piston-to-cylinder clearance, typically between 1.5 to 2 thousandths of an inch.

What is involved in Dragonman's flywheel assembly rebuild service?

The flywheel assembly rebuild costs $295 and includes new lower end races and bushings. Customers can choose between Jims Machining or Eastern Motorcycle Parts crank pins, along with 54 T-section roller bearings from New Jersey, all made from All-American parts.

Can Dragonman's Machine Shop increase the compression ratio of a Harley-Davidson engine?

Yes, compression can be increased by precisely shaving the cylinder head gasket surface or the cylinder itself. Removing up to 100,000ths of an inch can achieve higher compression ratios without causing engine imbalance or vibration, provided head bolts are trimmed accordingly.

What makes Dragonman's valve seat installation unique?

Dragonman's installs custom-made, lifetime nickel alloy valve seats that are 80% nickel, designed to withstand modern fuels with high methanol and alcohol content. These seats are pressed in with a 3-4 thousandths interference fit, making them exceptionally durable and difficult to cut.

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