Porsche Transmission Rebuild
The most noticeable performance decline in manual Porsche transmissions is the ability to shift easily / quickly / cleanly from one gear to the next---up or down. Syncro wear is most often to blame. Given worn syncros, shifting puts gears and dog-teeth at increased risk of damage, particularly if a driver does not shift-compensate for syncro wear. Should you experience any noticeable oddity when shifting, I recommend inspecting this condition sooner than later. Reason being, it's more economical to replace just syncro rings as compared to also replacing ruined gears and/or dog teeth.
'09 model Porsches and up have electronic PDK shifting.
Transmission oil in most cases should be changed every 15,000 miles. Do this regularly and you will go a long way to preserving the integrity, performance, and value of your Porsche transmission.
Porsche Clutch & Flywheel
Clutches & flywheels have a factory prescribed wear limit. Once beyond that limit, driving performance declines. You can extend the life of your entire transmission by driving it correctly. Not sure how to do that... Find out right now with no obligation. 305-588-0874
917 Long Tail
Click drawing to enlarge
Top: Broken head studs are marked in yellow. Performance declines some from cylinder & heads held unevenly to crankcase. Precise flatness of head surfaces and cylinder faces can be beat out of spec as a result of operating an engine with broken studs. Bottom: ARP studs have replaced all old stock studs. An excellent upgrade as these will last indefinitely.
Engine rebuilds typically begin with a leak-down test. This provides insight to what can be expected during rebuild in regards to valve and piston ring sealing integrity. Leak-down results seen above indicate cylinder #4 being best and #6 the worst. Differences seen here confirm this engine's lacking performance.
One skilled person is capable of correctly & safely handling a Porsche engine during the entire rebuild process provided the equipment required is on hand. Here, a 3.2 engine rebuild has just been completed. GP is preparing to connect the engine and its' matching transmission prior to returning them as a unit to the Porsche on the lift.
Click photos to enlarge
Porsche Rebuild Parts - Aftermarket Parts
By default, genuine Porsche or OEM parts (when available) are used for repairs & rebuilds. If an owner prefers aftermarket, that's an option and accomplished when possible. If you have any question as to a comparison between a genuine Porsche part and the matching aftermarket part, ask. Discussion will reveal pros & cons so you can make an intelligent, informed decision. Or, leave it to GP to decide if you prefer. As a Master Porsche Mechanic, GP serves as a steward of your budget and guardian for optimal quality always.
Where classic Porsches are concerned, it's an increasing challenge to find certain parts. Good news is there are resources across the nation and abroad so tough-to-find parts... can be found. Experience knows where to look for you.
Porsche Records / Documentation
Keeping accurate Porsche service & repair records substantiates the care given a car. Such records also provide very valuable reference when planning an engine / transmission rebuild. Working on any area of your car for that matter. Benefit being the ability to potentially find documented answers to questions that may arise before or while work is in progress. In short, the recommendation is: be a Porsche service record keeper if you aren't already.
GP / George Perdomo has GT and GTP class racing experience if you're interested. From the simplest of add-ons or refinements to your track Porsche, to extensive build outs for your class, you're in experienced, winning race hands here.
Following Porsche's Le Mans victory in 1970 and '71, the company redirected their racing efforts to North America and the CAN AM series. Teaming up with the Roger Penske organization, the 917/10 was created with magneseum tubular frame weighing just 100 lbs and a 5 liter turbocharged 12 cylinder engine producing 1,000 hp. In 1972, the 917 was the most powerful racing car in history. On the track, it brought McLaren's CAN AM leadership to a decissive end. The successor to the 917/10 was the 917/30 (the engine increased to 5.4 liters.) In August of 1975, Porsche took the 917/30 to the Talladega race track in an attempt to establish a closed course speed record. With Mark Donahue in the seat, they did so on August 9, 1975 with an average speed of 221.12 miles per hour---a record that endured for 15 years... eventually broken by an Indy car.
Air cooled Porsche engine thermal performance depends in large part on how clean the engine's exterior surface is. The cleaner the better as this allows heat to more readily escape the engine. It's up to my customer to decide what investment is made in "clean." Engine above has been degreased then media blasted. The alternative is to degrease only. Look at the difference below. (Click photo to enlarge.)
The quintesential Porsche race car of the early 1970's was the 917 series. So dominating was the 917 that racing rules were specifically altered to put an end to Porsche's unrelenting track dominance.
Porsche Engine Rebuild
Rebuilding serves to extract maximum power from your Porsche engine. And doing so exactly as Porsche's engineers specify. This requires great precision together with an intricate knowledge of correct disassembly, cleaning, inspection, measuring, determining what can be machined and intelligently recycled and what must be replaced with new, pure assembly, and final run-in. Combined and done accurately, this all sets the stage for your engine's new, powerful, and long life ahead. And all of which is provided you with the smart investment made in a GP Porsche engine rebuild. Explore what 30+ years of street & track Porsche engine rebuilding means to you. Speak with GP about your particular goals & budget.
Porsche arrived at shop with engine running with a noticeable knock. Diagnosis quickly determines an internal issue. After progressive dismantling with inspections done along the way, the problem is found: Whomever had previously worked on this engine failed to install #4 rocker shaft correctly. This led to the rocker binding... then that rocker's piston and valve making contact. The crankcase is open here to make an internal inspection. While the problem is the rocker shaft, since there was piston-to-valve contact, everything that may have been damaged must be inspected so any & all issues are found and complete repairs are made in one session---there is no exception to comprehensively inspecting for any & all possible collateral damage. In this case, the damaged parts---valve, guide, rocker, rocker shaft, and piston---were replaced for #4 cylinder. Below, the engine just before being reinstalled.
Click photos to enlarge
PROFILE OF A PORSCHE ENGINE REBUILD - After removing the engine from its chassis, inspections are done before cleaning. This allows any potentially valuable engine issue evidence to be found prior to it being erased forever by cleaning. Compression and leak down tests may be performed. As disassembly proceeds, inspection of parts both visually and with measuring tools is made. Notes are made for future reference. Any anomalies found along the way are photo-recorded and sent to the owner immediately. Parts cleaning follows. More inspections are made and more measurements taken. Next comes an evaluation of what parts need replacing and what parts can be machined for reuse. The owner is involved in this phase as various decisions need making---decisions relative to: OEM or aftermarket parts use; what additional attention may be applied the engine given accessibility; and possible performance modifications if not already discussed. New parts and machined parts that arrive are inspected for correctness to the order, then for dimensions and quality. Unless agreed to otherwise at the outset, rebuild measurements are according to precise Porsche factory specifications. Likewise, the rebuild process is also done according to Porsche factory standards (unless agreed to otherwise.) Timing of inter-related parts is a critical Master Mechanic function. Attending this properly results in an engine performing to its' engineered optimal/maximum level. Upon the engine's completion, it's then reinstalled. A specific break in procedure follows. Various inspections. Oil & filter change. Then tuning if needed, testing, perhaps a final tuning and testing. There are NO short cuts to precision engine rebuilds. No distractions are tolerated during critical stages. If your looking for Power + Durability, GP precision is what you what.
Looking for more than factory stock in your engine? GP can provide the expertise to make your engine rebuild better than what factory specs call for. Exactly what this entails depends on the goals you have in mind. In this regard, GP can help you understand & evaluate your options. Ultimately, you'll have a clear picture of what can be done to your engine during a rebuild, what the added investment is, and what the added performance outcome will be. Consultations are comp.
Endurance of your Porsche engine & transmission requires both areas receiving proper lubrication. This means:
Maintaining correct levels
Changing lubricants including filters on a scheduled basis
Using the correct lubricants for your particular engine & transmission
Adding oil radiator(s) for high performance driving
Maintaining clean oil radiators
Preventing / repairing oil leaks
The more frequently engine and transmission oil (and filter) is changed, the longer your engine and transmission will endure prior to needing major attention.
Earlier model Porsches require manual tuning adjustments on occasion. Later model Porsches are computer controlled. GP is scanner savvy. In a nutshell, you're covered from nuts & bolts to digital bits & bytes engine tuning.
Click photos to enlarge
Above: Gears, dog teeth, shift rods, forks, sleeves and bearings are being inspected in this transmission rebuild. If any anomaly is found, it's photo-recorded and immediately text-sent to the owner. Comments on what is found is always provided an owner unless that owner has a standing order for GP to progress with repairs as found status calls for.
Right: New flywheel is installed with pilot bearing and new bolts---new bolts are standard procedure as old bolts, once removed, are stretched from the initial torquing and so will not correctly stretch again. Old "doughnut-style clutch disk compared to new spring-style. Doughnuts tended to explode making a mess of components in a transmission's bell housing.
Transmission rebuild completed, the trans is connected to the engine with proper torque settings applied to fasteners. New oil is installed. Flanges on the drive couplings are cleaned and ready to receive the drive shafts/CVs with new gaskets.
Any and every mating surface on a Porsche engine/transmission rebuild must be very clean and flat. If not, the gasket applied is given the opportunity to leak. Eventually, it will.
Your GP Porsche engine rebuild is done under "pure" mechanical conditions. "Pure" means there's only one individual attending your engine start-to-finish. Unlike other Porsche shops, there are no mechanics hired off the street here in order for ownership to increase profits. There are no trainees making mistakes on your engine rebuild. And no swapping of mechanics during any stage of engine rebuilding which allows for the errors that cost customers time, frustration, power and money. Rebuild your Porsche engine with GP AutoWerks and you get one, highly experienced Porsche engine rebuilder attending your engine start-to-finish. That credentialed Porsche expert is GP / George Perdomo.
Standards & Beyond
Porsche factory specs, tolerances, torques, and OEM parts are meticulously applied to your engine rebuild as standard procedure. Should you be interested in going beyond factory engineered standards, or want more economy from aftermarket parts, consider what you'd like to accomplish. With any Porsche engine, more in any direction is possible. More operating simplicity from upgrades. More power from adding cc's, turbos or supercharging. More durability from going to extreme balancing of components. Bear in mind as engine performance increases, handling capability should as well. With years of GT & GTP racing experience, GP offers you the qualifications to intelligently guide you through the maze of options elaborating on the outcomes you can anticipate. This, regarding a consolidated engine-chassis performance mod for street and/or competition.
Same engine before and after GP AutoWerks rebuild. With most surfaces blasted and refinished with appropriate engine-area coatings (or left bare to match Porsche stock finishing) this engine rebuild is "with restoration"---an owner's option made at the outset of a rebuild. According to customer's goal in this case, work was accomplished to match a stock engine (for the period) as close as possible. While impressive from the outsides, when installed, this engine will offer the owner the same performance as when the engine was new.
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Porsche® Revive the Passion -
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Miami Porsche Service, Repair, Rebuild | GP AutoWerks
Power + durability.
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Master Porsche engine rebuilding. All work done to precise Porsche factory specs. Want more power, cc's, have a smoother and even more durable engine than stock specs call for? Discuss your rebuild options with GP. Have 30+ years of performance Porsche engine rebuilding experience on your side. Power + durability from precision---the lasting value had with a GP Porsche engine rebuild.
MIAMI PORSCHE SERVICE / REPAIR / REBUILD / PPI
To know more about the potential in your Porsche engine from a GP rebuild, please call. Or, look into the desktop site. There, you'll find much more rebuild info along with many captioned GP photos taken while work is in progress. Curious Porsche facts also await you. Visit:
Porsche, the Porsche crest and Porsche model names are the property of Dr. Ing. h.c. F. Porsche Aktiengesellschaft, Porsche AG ("Porsche") and is under licensed use by Porsche Cars North America, PCNA. The PCA logo is the property of the Porsche Club of America. No affiliation with either Porsche or the Porsche Club of America is intended or implied by GP AutoWerks, an independent Porsche service, repair, rebuild & PPI shop located in Miami, FL., U.S.A. Any use of the word "safe" or "safety" in this mobile site holds a car's owner and/or driver ultimately responsible for all matters concerning the operational safety of the car being driven or otherwise used. Please see desktop website for full disclaimer and credits.
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Power + durability.
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