Welcome to Downs Engineering
We are now in our 30th year as a California company and fifty years in the
racing industry. We have expanded our Hayabusa product line in order to
better serve our customers. We are a full service shop and are available to
do research and development projects, from engine and oil systems to
complete car builds. We have developed race winning products and
systems for the Hayabusa engine for the past 13 years.
Suzuki Hayabusa Engine
Undergoing Testing On Our
making you go fast is what we do best!
Hayabusa Specialty Parts
Setting up a custom design
Turbo Engine on the Dyno
Downs Engineering Sports Racing
Car. Available with a 175 HP
Hayabusa engine or a 375HP Turbo
Hayabusa. This is a 1000LB car.
Our Wet Sump and Dry Sump Oil             
Systems are the best Hayabusa               
Systems on the market today
Parts and supplies for all types of Motorsports.
Sand Rails, Kit Cars, Race Cars, Motorcycles, Track Cars,
Street Cars
Contact Mike Downs
Downs Engineering
19564 Eighth St East
Sonoma CA 95476
phone: 707 938 1011
fax: 707 935 0481
email: mdowns@downsengineering.com

Property of Downs Engineering. All rights reserved.
Having problems with your Busa? Low oil
pressure? Oil starvation in corners?
Connecting rod failures?  
Click here for
solutions to these and other problems
inherent in the Hayabusa engine.
500th Hayabusa Engine Ships

We have sold and serviced 500 Hayabusa
engines since 1999.  Our engines go to
discerning customers all over the world.  
Many of these engines were factory stock,
inspected and approved by D/E.  Many were
made for turbo-charged applications, while
others were made into normally aspirated
race engines.
The Artimus Box, a vintage
racing mystery thriller, is now
available in paperback and for
ebooks.  Check Amazon.com, or

We will rebuild your Hayabusa engine using new
OEM Main and Rod bearings. The rebuild also
includes New Piston Rings, New Oil Pump, and Cam
Chain, as well as a complete competition valve job.
We thoroughly inspect the gearbox and shift forks,
along with the condition of the clutch discs and clutch
basket. We run-in the completed engine on our
engine dyno. After run-in we make power runs on the
engine to insure proper running.

If you would like to upgrade your pre 2008 engine to
current power and torque levels we can install the
2mm stroked 2008-2011 1340cc crankshaft and
replacement exhaust cam.

Get ready now for the 2013 season. Racing starts
again soon.
Novac's Race, a vintage racing adventure,
is my latest book. Follow Jack Novac
while he thrills the crowds in Europe and
trys to stay one step ahead of a Nazi killer.
Available now in paperback and ebook
formats, available on Amazon.com and on
Click here for details
We are now dealers for Wossner
connecting rods, currently the
strongest Hayabusa connecting rod
available.  Limited time introductory
offer:  $800 per set.  Order your
set today.