Racecar Project - Engine Parts
#1
Nordschleife Master
Thread Starter
Racecar Project - Engine Parts
Here are a few pictures of the GT3R parts that I'm putting in my engine. The crank is a brand new unit and you can see it compared to a stock 964 crank. Some differences are that it has 180 degree oiling rather than 360 degree of the stock crank as well as being fully counterweighted whereas the stock is not. It is however 3.5lbs heavier.
GT3R oil pump where part of the case is cast iron as well as having an additional scavage port.
GT3R Crank in the background, 964 crank in the foreground
GT3R oil pump in the foreground, 964.993 pump in the background
GT3R oil pump where part of the case is cast iron as well as having an additional scavage port.
GT3R Crank in the background, 964 crank in the foreground
GT3R oil pump in the foreground, 964.993 pump in the background
#2
Jarhead
Rennlist Member
Rennlist Member
Cool gear! Some questions:
-What are the benefits of the 180 degree oiling and counterweighting of the GT3 crankshaft?
-What's the benefit of the extra scanvenge port on the oil pump? Does it actually move a larger quantity of oil?
Brian
-What are the benefits of the 180 degree oiling and counterweighting of the GT3 crankshaft?
-What's the benefit of the extra scanvenge port on the oil pump? Does it actually move a larger quantity of oil?
Brian
#3
Rennlist Member
Geoffrey-
Does it look to you as though the main pressure section of the 996 pump is longer than the 993 pump and the scavenge section shorter? Or is is distortion in the photo, I haven't had both pumps in my hand to compare.
I think the advantage of the 996 pump is that there are actually 2 scavenge pumps built into where the 993 pump has only one. The new pick up is at the flywheel end of the pump where oil would naturally puddle under heavy braking. I think the 996 pump would have improved scavenging under braking and similar scavenging to the 993 pump when car sitting still.
Does it look to you as though the main pressure section of the 996 pump is longer than the 993 pump and the scavenge section shorter? Or is is distortion in the photo, I haven't had both pumps in my hand to compare.
I think the advantage of the 996 pump is that there are actually 2 scavenge pumps built into where the 993 pump has only one. The new pick up is at the flywheel end of the pump where oil would naturally puddle under heavy braking. I think the 996 pump would have improved scavenging under braking and similar scavenging to the 993 pump when car sitting still.
#6
Burning Brakes
Join Date: Feb 2004
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The additional weight will be offset by reliability factors, which will prove to be substantially more valuable on the track vs the savings of a few pounds.
Same could be said for the installation of safety equiptment.
Duncan
Same could be said for the installation of safety equiptment.
Duncan
#7
Nordschleife Master
Thread Starter
I'm not really concerned about the extra weight of the crankshaft, it is lighter than a 3.2/3.3 crankshaft which it is more similar to than the 964 or 993 cranks. The weight will also be offset by the lighter pistons, connecting rods, 5.5" Tilton clutch and lack of the heavy vibration damper found on the 964 crankshaft.
The 180 degree oiling design allows for the connecting rod bearing to be oiled every 180 degrees rather than every 360 degrees. In other words, there are two oil holes in the crankshaft every 180 degrees rather than a single oil hole at 360 degrees.
The GT3R pump has a larger secondary scavage pump and has the benefits already mentioned.
The 180 degree oiling design allows for the connecting rod bearing to be oiled every 180 degrees rather than every 360 degrees. In other words, there are two oil holes in the crankshaft every 180 degrees rather than a single oil hole at 360 degrees.
The GT3R pump has a larger secondary scavage pump and has the benefits already mentioned.
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#13
Three Wheelin'
Join Date: Dec 2004
Location: Halifax, Nova Scotia , Canada
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Geoffrey,
The GT3 crank has what we used to call crossdrilling on the big ends ? It would maybe possible to drill a 964 crank the same way ??
Surely both cranks are fully counterweighted ? though the GT3 weights are bigger .
All the best
Geoff
The GT3 crank has what we used to call crossdrilling on the big ends ? It would maybe possible to drill a 964 crank the same way ??
Surely both cranks are fully counterweighted ? though the GT3 weights are bigger .
All the best
Geoff
944, 964, 993, aficionado, crankshaft, engine, gt3, gt3r, gt3roilpump, oil, porsche, pump, reliability, s2, turbo