The most expensive engine rebuilds are the ones
you have to rebuild twice!
Let RotorSports Racing do it right for you the first time.
RotorSports
Racing Engine Stages are designed to meet performance, application,
and budget expectations. They are however, also a guideline for
pricing and modification purposes, as any engine can be designed
to meet your own specific needs. For instance, there are options
such as ceramic apex seals for optimum reliability that may be
substituted for our standard upgraded apex seals. The stages are
also to be considered as options to meet your specific requirements
rather than a chronological step procedure to performance and
reliability on the same engine.
Stage
1
Stock Rebuilds are an economical choice for
engine replacement without sacrificing reliability. Each engine
receives careful inspection upon disassembly and all components
cleaned and checked for wear or damage. All engine seals, bearings,
gaskets and related springs and rubber "O" rings are replaced
with new OEM parts. The side housings are micro-lapped to restore
them to better than new condition. Engine Rotors and Rotor Housings
are reused only if in excellent condition and chosen by the customer
over new ones. Engine assembly includes installation of front
cover and sealing the oilpan, additional accessories can be installed
as well at customers request.
Streetporting
available
Stage
2
Stage 2 Engines feature new rotor housings, upgraded
apex seals with heavy duty springs, competition oil seal springs,
new oil pump and chain, high pressure oil regulator, and improved
design high flow main bearings.
Streetporting
and Bridgeporting available
Stage
3
Stage 3 Engines include all of the Stage 2 preparations
plus the engine rotors are machined and heavy duty 3mm apex seals
with dual springs are installed to prevent seal "skipping" at
high rpms and reduce the risk of engine damage from high turbo
boost. Additionally the rotors are
race clearanced, rotor housings receive
the cooling modification, the oil passages are enlarged, and
eccentric shaft modifications are
performed.
Streetporting
and Bridgeporting available
Stage
4
Stage 4 Engines are built using all new engine components
modified to racing specifications. All Stage 3 preparations plus
careful selection of both competition and modified OEM parts to
build the best motor for your needs. Recommended for highly modified
normally aspirated and turbo/ nitrous engines.
Streetporting
and Bridgeporting available
Preparation
Services
Streetporting
Porting of the intake and exhaust ports to maximize engine
power without adversely affecting street driveability. Porting
can only be performed on excellent condition used or new housings
and may require additional component replacement. This modification
involves porting all the intake and exhaust ports to change the
induction and exhaust timing and improve the airflow throughout
the engine operating range. Simply grinding out the ports to a
predetermined size without considering the rpm range, and portflow
characteristics will produce a lazy, and slow responding motor
that makes good horsepower only above 4000 rpm . Our proven porting
is designed for each engine type to flow more air by maintaining
high velocity through the port. This improves torque and peak
power without sacrificing throttle response or smooth idling.
Bridgeporting
For race prepared engines. This porting method involves
adding additional ports which increase intake timing. Due to the
increased intake to exhaust cycle overlap, bridgeported engines
must be revved much higher and require more internal engine modifications
in order to operate safely at these higher rpms. Engine idle,
low rpm power, and throttle response are compromised for maximum
power. Several types of bridgeporting, including turbo applications,
are available.
Rotor Housing
Cooling Modification
To increase the surface area and reduce thermal loads on race
and turbocharged engines we cut cooling fins into the coolant
passages in the rotor housing hot zones. The result is less rotor
housing water seal failures and extended apex seal life.
Eccentric
Shaft Modification
For race engines the factory ball and spring are replaced
with fixed jets for improved oil flow at high rpms . The shaft
journals are also polished to improve bearing life. Not recommended
for street driven cars due to low rpm driving, and thus lower
oil pressures experienced in stop and go conditions.
Two Piece Eccentric Shaft
Another option to rotor clearancing is using the lighter two piece
eccentric shaft by Guru Motorsports in Australia. This reduces
flex in the e-shaft at high rpm's thus enabling the rotor clearances
to be set at minimum and seal clearances to be tighter. This means
more horsepower. And it's 2.6 lbs lighter than the stock Mazda
eccentric shaft, which means quicker rev's and less stress. Read
more.
Rotor Clearancing
For high rpm operation increased clearance between the rotors
and the housing is necessary to prevent contact due to heat induced
expansion and rotational forces. For bridgeported and high boost
turbo engines. See also two piece eccentric shaft below.
Cryogenic
Processing
Cryogenic processing strengthens metalic components through a
process of controlled temperature reduction to specific cold temperatures
within specialized containers and then controlled raising of the
temperature. Used in racing for years for strength and longevity
in high performance engines. Racers report 3-5 times increase
in component life in race environments. Read
more
Engine/Turbo
Coatings
Various coatings are available to lower friction,
provide heat barriers, resist corrosion, resist carbon buildup,
prevent icing, and more including Coolkrome. Highly recommended
for high performance components for added power and reliability.
Available for engine components, intakes, turbos, transmissions,
differentials, brake systems, and more. Read
more
Urethane Motor Mounts
High performance high horsepower engines can break
the stock motor mounts. And over time, the stock mounts become
weaker until one eventually breaks. Consider RotorSports Racing's
Urethane Motor Mounts
with your engine rebuild.
Extrude Hone & Throttlebody Bore
RotorSports Racing offers Extrude Hone
services for serious rotary engine enthusiasts. You can enlarge
the passageways within the upper and lower intake, and if needed,
the throttlebody. Portflow is matched and surface contour is improved.
The result is more power through balanced airflow and efficiency.
Services can be performed to 13B and 20B intakes to maximize cfm
airflow.
Read more
Sonic Cleaning
Sonic cleaning services are available
for just about anything that needs to be thoroughly cleaned. Commonly
used for radiators, oil coolers, intercoolers, or other components
that can be difficult to clean by design. For instance, a spun
bearing will deposit bearing material throughout the oil passage
system. While much of it will settle in the oilpan, it is highly
recommended in such cases to sonic clean the oil cooler and inspect
the turbo(s). Upon disassembly of engines for rebuild, we sonic
cleaned parts prior to inspection and preparation.
| Engine
Stages |
E
Stage 1 |
E
Stage 2 |
E
Stage 3 |
E
Stage 4 |
Custom |
| New seals,
bearings, o-rings, gaskets, springs |
Y |
Y |
Y |
Y |
. |
| Shimming
eccentric shaft |
Y |
Y |
Y |
Y |
. |
| Upgrade
corner seal springs |
Y |
Y |
Y |
Y |
. |
| High
flow oil pressure regulator |
. |
Y |
Y |
Y |
. |
| Competition
oil seal springs |
. |
Y |
Y |
Y |
. |
| New rotor
housings |
. |
Y |
Y |
Y |
. |
| New oil
pump and chain |
. |
Y |
Y |
Y |
. |
| High
flow main bearings (stationary gear bearings) |
. |
Y |
Y |
Y |
. |
| New side
housings |
. |
Additional |
Additional |
Additional |
. |
| Side
housing Lapping |
Y |
Y |
Y |
NA |
. |
| Rotor
housing cooling modification |
. |
Additional |
Y |
Y |
. |
| Eccentric
shaft oil jets |
. |
Additional |
Option |
Y |
. |
| Oil passages
enlarged |
. |
Additional |
Y |
Y |
. |
| Steel
braided Oil Metering Pump Lines (FD) |
. |
Additional |
Additional |
Y |
. |
| New rotors |
. |
Additional |
Additional |
Y |
. |
| 2mm 2
piece apex seals |
Y |
Y |
Option |
Option |
. |
| 3mm 2
piece apex seals |
N |
Option |
Y |
Option |
. |
| 2mm 2
piece ceramic apex seals |
N |
Option |
Option |
Y |
. |
| 3mm 2
piece ceramic apex seals |
N |
Option |
Option |
Option |
. |
| Rotor
machining for 3mm seals |
N |
Option |
Y |
Option |
. |
| Rotor
clearancing |
N |
Option |
Option |
Option |
. |
| Engine
streetporting |
N |
Option |
Option |
Y |
. |
| Engine
bridgeporting |
N |
Option |
Option |
Option |
. |
| Cryogenic
tempering |
. |
Option |
Option |
Y |
. |
| Engine coatings |
N |
Option |
Option |
Y |
|
| Turbo/Exhaust
coatings |
N |
Option |
Option |
Y |
|
| 2 piece eccentric
shaft |
N |
Option |
Option |
Option |
. |
| Stationary
Gear Sets |
N |
Option |
Option |
Option |
. |
Option= optional services costs added to standard
pricing
Y= Included in the Engine Stage structure (or recommended in Stage
4 engine)
N= Not available in that Engine Stage structure
Rebuild
Kits available
