Ultima®
El Bruto Engines Big Inches
Economy backed by Racing Technology

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A Barrel-Chested Brute of an Engine to POWER your Bike

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El Bruto™ Series100ci 4" bore Engines

Ultima is now offering the new " El Bruto" series engines which are designed to provide our customers with a USA built High Performance engine that was priced to be the best value of any engines now on the market. Ultima’s commitment engineering excellence and competitive pricing brought El Bruto to life with a completely new design set of castings emphasizing performance, reliability, and value.

All of the castings in these Engines are poured in US foundries and are based on all new CAD designs cast from C355 Aluminium a common US Military alloy known for its stability over multiple heat cycles. The engine components are machined on state of the art CNC equiptment for guaranteed dimensional accuracy and repeatability. All of our engines are dynamically balanced using propritory methods to provide the smoothest running engines on the market and now with our new high flow cylinder heads these engines now can boast the most powerful engines on the market as well!!

We think that you will agree these engines are the best value anywhere.


Product Specifications/ Highlights 100 Ci

Bore: 3.875"

Stroke: 4.25"

Piston: Forged

Compression: 9.6:1

Rated Power: 115 RW Horsepower

115LBFT Torque

Camshaft: 248Duration 625lift

Pushrods: Ultima

Valve Spring: Ultima

Chrome Nose Cone/Rocker Boxes

Billet Oil Pump/Tappet Blocks

Mikuni 45mm HSR Series Carburetor

Cases

See description here >> CASES <<

Crankshaft

See description here >> STROKER <<

Cylinder

C355-T6 Casting

Cast in heavy wall liners will not move

Liners are Centrifugly Cast with Graphite impregnated Nickle for high durability

All Fins are machined for an excellent cosmetic appreance

Cylinder Head

C355-T6 Casting

All fins are machined for excellent cosmetic appearance

Twin Cam Styling

30 % More fin than most Evo style heads for cooler running

2.100 Stainless Int Valves

1.700 Stainless Ex Valves

Manganeze Bronze guides

High Silicon WireValve Spring w/ Chromoly Retainer

 100 CI Complete Engine

298-250 Complete 100 CI Engine-- Natural Finish
298-251 Complete 100 CI Engine-- Black Finish
298-252 Complete 100 CI Engine-- Polish Finish


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Good Old
American
Know-How

Quality
Performance
Ingenuity
Style
Economy
Toughness
Tradition
Expertise

Tour the Engine Engineering Dept.
and Assembly Facility
>> TOUR <<

Styled Machining & Clean Custom Looks
That are backed up by
Smooth Powerful Performance

EL BRUTO Big Inch

>>  100" ENGINE  <<

>>  Long Blocks  <<

>>  113" ENGINE  <<

>>  120" ENGINE  <<

>>  Long Blocks  <<

>>  127" ENGINE  <<

U L T I M A    E N G I N E S

>>  80" ENGINE  <<

>>  Short Blocks  <<

>>  96" ENGINE  <<

U L T I M A    C O M P O N E N T S

>>  Engine Cases <<

>>  Stroker Kit  <<

>>  Connecting Rods  <<

>>  Cylinders & Heads  <<

>>  Ignition Line  <<


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