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Porsche engine during rebuild when cylinders are being pulled by George Perdomo

Nikasil cylinders being pulled to make various inspections. Bores in these are electroplated with a very thin layer of nickel-silicon carbide. This makes them extremely slippery as well as very durable. Originally created for the 917, they remain the cylinders of choice for high performance Porsche engines.

Porsche RSR clone's engine is being tuned by George Perdomo so each cylinder breathes equally

Carbs have been re-jetted in RSR clone. Cylinder air flow is now being finely tuned so that all cylinders will breathe equally. Basically, this is air flow balancing.

Porsche engine with 4 broken head studs is being repaired

Engine has total of 4 broken head studs---2 on this side at #4 and #6 and 2 on the other side. When studs break, the related head's fastening is unbalanced (due to the broken stud.) This causes damage to / rounding of the head's mating surface. These were rounded by 0.001". Doesn't seem like much but that small measure is unacceptable in a Porsche engine. These heads were subsequently milled perfectly flat---the way they were when this engine was new.

Porsche has been lowered and raked 2 degrees for improved handling

Customer's car after being lowered and raked 2 degrees. This refinement improves both cornering and straight-line stability as well as front-end braking. Drive this car and exactly the same Porsche in stock stance geometry and you'll immediately notice the improved handling & control given by this refinement.

30 year old Porsche engine has been restored / rebuilt

Rebuild of 3.2 engine nears completion. Before owner takes control, I'll treat it to a very specific break-in procedure culminating with an oil & filter change. When done, this engine will perform like new.

Porsche RSR clone is parked outside GP AutoWerks waiting for engine performance adjustments

RSR clone has just arrived for engine performance adjustments.

Porsche engine's cam timing is being set

To get an engine's full power potential, it is essential to precisely time the cams on both sides. Here, the dial gauge indicates a precision setting on this cam.

ARP Head studs are installed in Porsche engine

ARP studs installed. This is an excellent upgrade when replacing stock studs as ARPs will last indefinitely.

Porsche 356 replica on flatbed arrives with ignition and handling issues

356 replica has been brought in with ignition and handling issues. Bad wiring done on "upgraded" ignition components is found. Handling problem is two-fold: 2 out-of-round wheel rims, and bad bushings. Corrections are made to return ignition and handling to premium form.

Porsche pistons and cylinders are laid on table

Cleaned, inspected and measured Turbo pistons & cylinders. With all specs in factory order, only a new set of rings is needed to restore this engine's compression to peak performance.

New Porsche piston ring held in hand

New piston rings are visually inspected prior to weighing each set. Ultimately, swap-allowable components will be moved among assemblies to minimize weight deviation. The goal being to optimize reciprocating balance without the need/cost for machining. We'll discuss the final weight deviation with the owner who can decide to machine if greater precision is desired.

Six Porsche spark plugs are set side by side for comparison

Plugs are revealing of an engine's operating condition. Here, cylinder 6 has extreme issues... bad rings and/or a worn intake valve guide and/or seal. Based on the information given here alone, this engine's performance is significantly lacking. We'll show these to the owner and speak about what corrective paths might be taken. (Owner's decision was to rebuild.)

Night shift at George Perdomo's Porsche service, repair and & rebuild shop in Miami

Night shift at 73rd Ave shop.

Porsche engine is ready to receive new rod journal bearings

Case is prepped to receive new rod journal bearings. (With crank journals in excellent condition, there's no need to split this case.) Clean mating surfaces are essential to the durability of a rebuilt engine. Look closely at cylinder seats---super clean.

Porsche engine with nearly 300,000 miles is removed from car and being prepared by George Perdomo fo

'80 CIS engine with nearly 300,000 miles has just been removed from its companion chassis. This engine and transmission are scheduled for a comprehensive rebuild. A set budget is already given so we are clear on what the owner wants/expects before proceeding.

Porsche connecting rods with new journal bearings are laid out in tray

Connecting rods with new journal bearings. Together with their piston assemblies, these have been balanced to within 0.5 grams deviation. To make this worthwhile, crank and flywheel must also be balanced to the same tolerance. The result is a very smooth running engine with exceptional durability.

George Perdomo reaching into Porsche engine area to tune engine

After many years of experience, it's possible to tune an engine by sound & touch alone. Here, a 3.2 is being run through low, mid, and high RPM ranges. Immediately after this photo is taken, fine adjustments are made to improve high-end performance.

Porsche parts laid out on ground for inspection

I inspect parts immediately after receiving them. Anything wrong is corrected quickly. This prevents progress delays due to part supplier errors. Ultimately this means my customers consistently see their cars sooner than later.

Porsche turbo exhaust-side drive blades

Turbo's exhaust-side drive blades are visually inspected to determine immediately if, due to any damage, there's reason for replacement. These blades look good. Shaft play was checked just after this image was taken and that too reports in order. Missing stud will be replaced upon reassembly.

Porsche brake pads falling apart

Brake pads fell apart upon removal from car. Should these brakes have been needed for an emergency, the corner where the loose pad material was would most likely not have worked correctly. These are economical Mintex pads---I would never recommend this type pad for a Porsche.

Porsche's magnetic drain nut has collected worn metal

Transmission's magnetic drain nut is doing its job collecting worn gear metal. Given when this oil was last serviced, this transmission is experiencing normal wear.

George Perdomo's signature Porsche height & rake setting on classic 930

My signature height & rake settings on a classic 930. Lowering obviously brings the car's center of gravity down. A 2-degree nose down rake improves front brake performance as the nose is already "advanced" downwards when the chassis begins a braking cycle.

Porsche engine's stained interior walls

Stained interior walls of this chain housing case tell of oil not being changed frequently enough---bad news for ALL lubricated parts in this engine. Compare these walls to those in the next chain housing...

'79 Porsche engine's interior walls indicating a well-cared for engine

'79 chain housing...6 years older than housing just seen. By comparison, these walls indicate a well cared for engine---an engine that's experienced frequent oil & filter changes. Based on lubrication care alone, there's a very high probability of all the internals of this engine being in better condition than those in the stained wall engine. (Hydrolic tensioner upgrade is seen here. An excellent decision.)

Complete Porsche 3-condenser AC system hose coiled on the ground

Guess how much hose there is in a 3-condenser Porsche AC system? Answer is at end of next photo's caption.

Porsche AC compressor in black death mode

AC compressor in "black death" mode. "Black" being due to the amount of metal worn from piston failure and mixed with the system's oil. "Death" being due to incorrect---lacking---oil charge. Is not worth repairing this compressor---new unit is called for. Entire AC system must be flushed of this "oily soot" to work correctly. Then recharged with correct oil and refrigerant amounts. (Answer to question: 40+ Feet.)

George Perdomo preforming a compression test on Porsche engine

Compression test in progress. Combined with a leak down, the two data sets provide a clear picture of each cylinder's sealing integrity within an engine. Only a leak down procedure reveals exactly where issues are within a given cylinder.

'74 Porsche Carrera parked on Rocky Mountain Road

Customer's '74 Carrera in the Rockies. With almost 3" of ground clearance, this car corners as if on rails. The trade-off is there's very little suspension travel. This creates a very stiff ride.

Porsche 930 heads just removed from car sit next to each other on ground

Just removed 930 heads. From this engine's leak down test, we know valve seating is good but the rings are not. Further testing will be preformed to confirm this status. I'll also check guide-to-valve clearances. Stem seals are replaced by default.

Before & after of Porsche engine heads showing dirty and clean heads

Before cleaning, components are always inspected to see what evidence of anomalies may be shown by the grit & grim an engine's parts wear. If parts are cleaned before such inspections, valuable "evidence" may be lost forever.

'80 Porsche Targa roof top being rebuilt

'80 Targa top with skin & burlap removed. This is headed for a complete restoration. Worn webbing will be replaced, joints lubricated, plates repositioned to spec, new skin & cushioning, and ultimately the roof will be tuned to the car to minimize wind noise and eliminate water leaks.

George Perdomo inspecting Porsche engine rod bearings for play

Rod bearings being checked for play at the crank shaft. A specific measure of front-to-rear play of rods at the crank is acceptable. Unwanted is any lateral swing movement of the rods at their piston-ends. If there is swing, a worn rod bearing is evident.

Porsche engine's oddly positioned intake gasket

Dismantling engines often uncovers mysteries---in this case an oddly positioned intake gasket. While this gasket has shifted slightly before this photo was taken, its original position can be detected given the gasket's intact grime line.

Anti seize being properly applied to Porsche engine's alternator shaft by George Perdomo

Where proper to apply, anti seize serves its name sake allowing parts to separate easily be it tomorrow or 10 years from now. This makes for smart mechanical servicing no matter who returns next to parts treated in this manner.

Porsche engine's exhaust manifold leak is revealed

Whomever installed this engine's exhaust system last failed to correctly secure this exhaust manifold. The result is a flange leak evidenced by the soot marker on the cylinder. While an engine is installed and running, the sound this produces can be taken for a broken stud unless one knows the resonance difference between the two.

George Perdomo applying liquid gasket to Porsche engine chain housing cover

Chain house cover getting a liquid gasket application. When applied correctly, this type of "gasket" allows parts to expand & contract without the seal loosing integrity.

Porsche fuel tank seam is rusting

Fuel tank seam. In tropical climates, these seams rust predictably. Got to catch this corrosion early or an otherwise excellent tank will be ruined by its seam's deterioration alone. This tank is being attended early. Will clean and treat the seam all around, returning to the owner a fuel tank more durable than a new OEM.

Excessive oil leaking from below Porsche engine

Minor oil leaks in Porsche engines are typical. This is excessive and unacceptable and should (was) attended immediately. Bottom line, oil and a hot exhaust are a bad combination. This is a potential fire hazard. Would be worse if the oil return tubes were leaking. Here, they are not. Good idea to look under your engine once in a while---or have it inspected.

Porsche crankshaft is removed from engine to take several measurements

Crankshaft just removed from its case. There's several measurements to take after disassembling. What's found is compared to factory specs and reported to the owner. While I advise what should be done as part of this report, it's always the owner's call as to what is accomplished.

Porsche 911 running on 5 cylinders has chafed-through fuel injection wire

"5 Cylinder" 250k mile 911 is in to find out why and where the loss of power is. Fuel starvation is found at one cylinder. Then the root cause: an injector wire has chafed through on the air filter box rendering its cylinder useless. This wire is repaired, then rerouted to prevent a repeat performance.

Porsche doughnut clutch disk compared to spring clutch disk

Old rubber dampened clutch disks are risky. They're prone to failure and when they do fail, rubber chunks fly throughout the clutch area causing some measure of collateral damage. When replacing a worn rubber disk, I advise going with a spring dampened disk unless there's call for originality---as there sometimes is.

Porsche magnesium fan housing is cracking

While exceedingly light in weight, magnesium fan housings tend to fracture over time due to operating stress.

Another Porsche magnesium fan housing cracking

Another view of the same fan housing. Once fractured and so weakened, tension from the alternator belt can pull a housing out of round...

Porsche fan housing showing area where fan blades have contacted housing

Once pulled out of round enough, fan and housing meet. Contact usually occurs around 1 and/or 7 o'clock inside the house (due to the directional pull of the belt.) Contact between these parts makes a distinct bell ringing sound that's audible from inside the car when the engine is at idle...

Porsche cooling fan that has made contact with housing shows result of friction

To avoid the expense of a replacement fan, we advise not driving your car once contact between fan and housing occurs. This fan is partner to the housing just seen. The result of contact / friction is clear. Because this deterioration typically occurs at the rear edge of the blades, it's hidden from view when the fan's in operating position in the engine.

Bite in original Porsche chain housing o-ring

Bite in this chain house o-ring tells of an inexperienced installation. Fact is, someone qualified would sense this seal being bitten when it occurred... and should have removed and replaced it immediately.

Photos of Porsche service, repair & rebuilding performed on customer's cars and parts.


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GP AutoWerks

Shop Address

4551 SW 71 Ave.

Bay #1, Miami, FL




Notes, Disclaimers

& Credits

GP AutoWerks is an independent Porsche service & repair shop located in Miami, Florida, U.S.A. Serving both street and race track enthusiasts, GP AutoWerks provides a full range of Porsche mechanical capabilities from simple adjustments to comprehensive engine and transmission rebuilding for both classic and contemporary Porsches. Porsche, the Porsche crest, and Porsche car model names are under licensed use by Porsche Cars North America, Inc. (PCNA) from the owner Dr. Ing. h.c. F. Porsche Aktiengesellschaft, Porsche AG ("Porsche.") No association or affiliation with Porsche, PCNA or AG is intended or implied by GP AutoWerks who happens to

specialize in service, repair, PPI, modification and restoration of Porsche vehicles. Videos shown are Porsche productions presented for educational & entertainment purposes only. Permission for presentation is on file. Thank you.

Photos of Porsche service & repair, including engine & transmission rebuilds, brakes & suspension, body werks, interior, modification & restoration, and PPI work including parts and cars depict the property of GP AutoWerks' customers. All such images are used in this website with the expressed permission of GP AutoWerks' customers.  Thank you.

Photography, unless credited otherwise, is © 2015-2020 Karl Hansen. All rights reserved.

Photo captions are provided to reflect photo content and credits appear where due.


Website © 2020 Karl Hansen. All rights reserved.


Happy Porsche driving! And remember to please buckle up because being glad you did is a wonderful thing ~~~

GP AutoWerks


Independent Porsche Service, Repair & Rebuild Specialist

Porsche: Tune Up, Oil Change, Engine Rebuild, Transmission Rebuild,

Brakes, Suspension, Alignment, Corner Balance, Air Conditioning, PPI


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