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Comparison of GT2/3/Turbo engine to the 962 racing car engine
There is a cool thread on the Pelican board HERE where a 962 engine is rebuilt. I asked if I could use some of the photos to show that the GT2/3/Turbo engine is really a derivitive of the 962 racing engine. This is the kind of stuff that to me makes a Porsche cool, and why I can't stand the normal 997/Boxster/Cayman stuff.
The 962 engine was created by taking the aircooled crankcase and adding water cooled cylinders and water cooled cylinder heads to it. This was modified for street use in the GT/Turbo street engines. In fact, the first batch of GT3s to come to the USA still had the remnants of the aircooled crankcase casting, Porsche redid the case to eliminate these features in later production. The 962 engine uses individual cylinder heads while the GT3 uses a single head to cover 3 cylinders. The cam drive on the GT3 is a chain drive rather than gears. The oil pump on the 962 has 3 rather than 2 scavenge pumps and there are a lot of other details that are different, but the GT2/3/Turbo have Porsche racing heritage to the bone and the other Porsche stuff is pretender Porsche to me.
The GT3 gearbox is the same kind of story.
So think of this next time you drive your GT3, the engine is derived from the 962 racing car. Below is a picture of the inside of the crankcase, note this is very similar to the GT 3 street engine except for the oil pump and gear driven cams of the 962. Note Titanium rods.
Below is the crankcase with studs sticking out. Aircooled or watecooled the engine is same at this point of assembly. The heads and cylinders go over the studs.
Below are the cylinders and cylinder heads which slip over the studs above. In an aircooled car these would be finned, here they are jacketed for water.
Below the cambox is shown on top of the heads.
Below note the oil filter which is same as seen on 906 in the mid-60's. On an aircooled engine this is where an oil cooler mounts, on GT3 this is where the dry sump tank mounts.
These are the cams mounted in the cambox, on the GT3 engine the cams would have sprockets instead of gears since the cams on the street engine are chain driven.
have you ever heard the sound a 962 makes at speed? it's probably the single best engine / exhaust note in history. at least according to me.
some guy in holland or denmark makes street versions called the 962 Dauer LM- they retailed for about 950,ooo euros way back in the day...now that is a car to dream about
have you ever heard the sound a 962 makes at speed? it's probably the single best engine / exhaust note in history. at least according to me.
some guy in holland or denmark makes street versions called the 962 Dauer LM- they retailed for about 950,ooo euros way back in the day...now that is a car to dream about
+1
And I wonder why they don't mention the Dauer car when they call the new Bugatti the fastest car ever tested. If I'm not mistaken, the Dauer (depending on your source) is capable of almost 260mph depending on gearing, and acceleration also faster than the Veyron. (Sorry for the OT)
There is a cool thread on the Pelican board HERE where a 962 engine is rebuilt. I asked if I could use some of the photos to show that the GT2/3/Turbo engine is really a derivitive of the 962 racing engine. This is the kind of stuff that to me makes a Porsche cool, and why I can't stand the normal 997/Boxster/Cayman stuff.
The 962 engine was created by taking the aircooled crankcase and adding water cooled cylinders and water cooled cylinder heads to it. This was modified for street use in the GT/Turbo street engines. In fact, the first batch of GT3s to come to the USA still had the remnants of the aircooled crankcase casting, Porsche redid the case to eliminate these features in later production. The 962 engine uses individual cylinder heads while the GT3 uses a single head to cover 3 cylinders. The cam drive on the GT3 is a chain drive rather than gears. The oil pump on the 962 has 3 rather than 2 scavenge pumps and there are a lot of other details that are different, but the GT2/3/Turbo have Porsche racing heritage to the bone and the other Porsche stuff is pretender Porsche to me.
The GT3 gearbox is the same kind of story.
So think of this next time you drive your GT3, the engine is derived from the 962.
heritage to the bone.
You said it all... that's what makes these cars so special
Time for an update. Here are pictures of a GT3 engine I took apart.
Open crankcase is just like air cooled. All the parts seen can be used in an air-cooled engine, the Ti rods, crank, countershaft and oil pump.
Note that the countershaft, which has a 959 part number, is machined from a single steel forging like the 962 (normal 911 part is two piece, a steel shaft with aluminum gear bolted on to it), but has helical cut gears and sprockets for chains. The GT3 oil pump has a tandem scavenge section with two pick ups. Crankshaft is gun drilled and the rods are titanium.
Main difference with 962 is 959 style water cooled cylinder heads which cover 3 cylinders and are not welded to the cylinders. 962 has 6 individual heads electron beam welded to the cylinders.
Note that the GT3 cylinders are Nikasil units that are basically an unfinned version of an air cooled cylinder that is mounted in a water jacket.
The engines have hand engraved numbers on the parts in some places as assembly notes. Like an old 356 4 cam - heritage again.
10-29-2006, 05:01 PM
Comparison of GT2/3/Turbo engine to the 962 racing car engine
