RX8 Engines

Pettit Built Renesis Engines

In the past 20 years Pettit Racing has produced more than a thousand race and street rotary engines earning a worldwide reputation for unsurpassed quality, top performance and outstanding reliability. A reputation earned by having a passion for quality, superior attention to detail and Racing Championships to back it up.

Every engine receives the following enhancements:

  1. FLEX ARMOR APEX SEAL FORTIFICATION— OUR LATEST TECHNOLOGY TO FURTHER STRENGTHEN AND SAFEGUARD YOUR ENGINE
  2. BLUEPRINTED, STREET PORTED, AND ALL CRITICAL WEAR / CONTACT SURFACES RECEIVE OUR PROPRIETARY FINISHING TREATMENT
  3. PETTIT HOUSING MODS IMPROVE COOLING TO MINIMIZE SURFACE PROTRUSION AROUND LEAD PLUGS
  4. MODS TO SEAL PATH AND PORTS HELP TO BETTER MAINTAIN COMPRESSION SEAL INTEGRITY DURING PORT CROSSING AND CLOSURE
  5. OIL SYSTEM MODS IMPROVE OIL FLOW TO BEARINGS
  6. MAIN & ROTOR BEARINGS CLEARANCED TO RACE P-SPECS
  7. EIGHT QUALITY CONTROL INSPECTIONS
  8. CLEAN-ROOM ASSEMBLED W/ROTOR PRO TOOLS
  9. STATIC COMPRESSION TESTED, CAPPED AND SKIN-SEALED FOR SHIPPING

Top Quality:

So what makes Pettit Built Engines the best and how is that consistently achieved for over 1000 engines?  Every Pettit Built Engine receives 8 quality control inspections; first the “rejection” inspection identifies all the failed and unusable parts from the chosen core or your old engine, these failed parts tell a story and this valuable information is very important because determining the cause or causes of failure can pinpoint existing problems so they can be corrected before they cause damage to the new engine. This is just another way we try to insure that your Pettit Built engine will have performance and longevity beyond expectations. Next even brand new parts are carefully inspected and approved for each and every engine. Then all modifications, porting, machining, blueprinting and custom work are completed and inspection #3 is performed. The parts then receive a high temperature detergent bath and high pressure rinse by a 10hp cleaning machine and inspection #4 is performed. Then on to preassembly and inspection #5, to pass the preassembly inspection a 12-18 micron finish is required on all critical surfaces. To consistently achieve these high standards, Pettit has developed several proprietary methods for machine and hand finishing of all critical surfaces, just one more reason Pettit Built Engines are considered by many to be the best. Next is Inspection #6, during this inspection the oil galleys, internal passages and all mating surfaces get a final inspection and special protective finishes are applied to the iron and aluminum parts. The parts are now ready for the engine (clean) room, there inspection #7 is performed as all critical openings are caped or sealed and made ready for final assembly. Finally during the assembly process we perform one last inspection for a total of 8 quality control inspections.

On top of all the inspections and  paying close attention to every detail we only use genuine Mazda Parts, then every engine is personally assembled by Cam Worth, that’s right for over 20 years he personally assembles every engine sold by Pettit Racing as well as countless engines for numerous race teams, all the R&D and race engines for Pettit projects and many special engines for magazines, project cars, boats and marine use, prototype and experimental multi-fuel engines, the new Diasio Renesis powered sports racers, the new X Board rotary powered surf boards and most recently AXIO 1 rotor kart engines.

Modifications:

Our standard street port is the right choice for both naturally aspirated and forced induction Renesis setups. Our modifications improve efficiency and flow with out major changes in port timing, benefits include more power delivered through all the rpm ranges as well as better fuel economy and improved longevity, besides our porting and blueprinting every Renesis engine receives special machining to improve coolant flow around the exhaust ports and reduce surface protrusion around the leading spark plugs, these modifications are a must do for turbocharged Renesis Engines.

Horse Power:

The naturally aspirated Pettit Built Renesis when properly tuned with ambient temps around 70-80F, using a header and open exhaust will produce 245+hp or 210whp @ 8800 rpm

The same Pettit Built Renesis with our forced induction system, (supercharger) running 8-10 psi boost and maintaining charge temperature of less than 135F and again properly tuned w/ a header and open exhaust can produce 365+ hp or 330whp @  8400 rpm.

With Turbo charging @ 12-14 psi/boost and maintaining a charge temperature of <125F with a .8:1 or less backpressure ratio is capable of producing 200 hp / rotor, or 400 hp, sure more boost makes more power but then other factors like material strength and management errors become more critical and these variables can lead to unexpected failures.

Engine Longevity:

Engine Life is totally dependent on proper care and the best balance of performance and longevity is achieved by following our recommendations page. The basics are warm it up easy, keep the oil clean, use a quality fuel lubricant additive and good quality fuel. These simple techniques have proven to work for many customers worldwide and many have reported their Pettit Built engines still performing well with over 15 years of use.

Renesis exhaust and intake ports:

Renesis exhaust and intake port flow path modifications (some pictured above) i.e. radius machining, blueprinting, porting, polishing and our modifications that improve coolant flow around the exhaust ports, all help to minimize heat concentration on the side housing surface at the outer edge of the exhaust ports, this is proving to be a common point of failure especially with turbocharged Renesis engines. These modifications reduce temperatures in several critical areas which not only adds power but also makes a significant improvement in reliability.

Build your Engine:

Due to a shortage of engine core parts the best and most cost effective method for obtaining a Pettit Built Renesis Engine is to ship us your old engine, once here we disassemble it, inspect it and call you with our findings and exact cost.

 

Failure Analysis:

We also perform a failure analysis and in most cases the old parts tell us what caused your engine to fail, this can help correct existing problems insuring your Pettit Built Engine provides many years of avoid

Customer Participation:

Another popular service we offer is allowing customers to participate in disassembly, inspection and/or failure analysis of their engine, 30-45 minutes.

For a few customers who did a great job destroying some expensive parts, most commented  had they not seen it first hand, it would have been hard to believe the amount of parts affected.

After disassembly / inspection we provide the final cost for your build as well as the most cost effective way to achieve your goals. The average time on these builds is 10 working days.

Injector Service:

Included at no cost with every Pettit Built Engine is service for the injectors, we clean and  flow test each one then perform a pressure and leak check on both primary and secondary fuel rails, this further insures your Pettit Built Engine runs at peak efficiency from day one which is especially important during the initial seating period for seals and critical surfaces. Another reason Pettit Built Engines are known to provide performance and longevity beyond expectation.

Instructions:

We provide install, start up and run in guidelines as well as include some Protek-R fuel lube with every engine

Pricing: Most engines that arrive here for building need at least 1 new rotor housing, which puts the average cost at $3695 plus the housing $900 for a total of $4135

Pricing for OTS Pettit Built Engines:

To get a Pettit Built engine without sending a core, we will ship you a Pettit Built OTS engine (off the shelf) these engines all come with new rotor housings and rotors, due to all the new parts these engines cost $4950 plus the refundable core charge of $1000 when we receive your usable core, total cost before core refund $5850.

Turnaround:

The average turnaround time is 10-12 working days.

Renesis R&D at Pettit

Failure Analysis and Prevention for turbocharged Renesis Engines

The following information has been compiled from the ongoing R&D at Pettit. Since late 2003 when we opened the first failed turbo Renesis, we have been testing and evaluating our modifications to improve performance and reliability for both the naturally aspirated and forced induction Renesis setups. We gained much knowledge from preparing engines for the Diasio D962R Sports Racers www.Diasio.com as well as engines for our customers worldwide. More knowledge came with the Diasio turbo models, it now produces 370whp @ 12 psi and after several updates the latest version is performing well with several race wins to back it up.

Pettit modifications, some pictured above, include exhaust port and intake port flow path improvements like radius machining, blueprinting, porting, polishing and mods that improve coolant flow around the exhaust ports, this reduces temperatures in the area where side and corner seal failures have proven to be a common problem with turbo charged Renesis engines. Our modifications to the rotor housings help reduce the affects of elevated combustion temperature around the leading plug hole minimizing surface protrusion that causes apex seal skip, chatter and eventually failure. Our modifications not only add performance but make a significant improvement in reliability and longevity Cooler operating temperatures will further improve these results.

Pictured above are examples from failed engines which had turbo systems designed for 5-7 psi but ran higher boost, this can raise back pressure ratios as high as 3:1 raising combustion temps to the danger zone and compressing hot exhaust gasses between the engine and turbo concentrating heat on the edges of the exhaust ports. This in turn transfers to the side seals, even the springs that hold them seated can be affected. These conditions also can cause the minute film of protective lubricant to vaporize resulting in elevated friction and wear, which generates more heat and wear eventually causing hard starting and / or a weak idle on hot engines. At this point it is a good idea to send in the engine before a catastrophic failure leaves you stranded and ruins some expensive parts.

The following picture shows a stock Renesis exhaust port from a turbo charged application, in order to better show the failure / wear the surface around the port was decarbonized and cleaned. It appears turbo back pressure and heat load at the outer edge of this exhaust port caused enough surface deformation to allow the corner seals to gouge away some surface material causing damage to the corner seals and side seals, this resulted in compression loss and engine failure, not to mention ruining some expensive parts.

The Renesis rotor housings pictured below have several road races in turbo charged Diasio Sports Racers producing 340-370 whp. The left picture shows a stock Renesis rotor housing with apparent apex seal skip and chatter this is evidenced by carbon around the leading plug hole and chatter narks following. It appears that combustion heat load around the leading plug hole is causing some material protrusion above the normal housing surface. It is theorized that under these conditions and with high revs the apex seal appears to be loosing contact, as the seal travels over the minor axis (hump) it naturally has a reduction of contact pressure, then as it passes over the surface protrusion around the leading plug hole there is another loss of contact, this may be where chatter is induced.

The right picture shows a housing that has our modifications intended to reduce surface temperatures and improve cooling around the leading plug hole, it shows little evidence of contact loss and appears that the modifications made a significant improvement on the areas in question. Any thoughts or ideas on these are appreciated, forward to info@pettitracing.com