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10

I certainly don't claim to have any special inside knowledge as to why Porsche engineers decided to route the exhaust that way, but I think that we can analyze the possibilities and trade-offs from an engineering view and perhaps see how one might come to such a conclusion. The possible options I think we can safely eliminate any front-facing exhaust ...


8

After all the hand waving and posturing, allow me to point out that the track was a whole 2 kilometers shorter when the 956 set that time. Also, those 2km were a technical part. Aside from that, one should also take into account the fact that the Porsche 956 weighed only 800kg. That's lighter than a Fiat Uno Mia. No supercar today weighs less than a ton (...


6

Yes for the most part an AGM is a drop in replacement for your standard Lead Acid Battery. The charging voltages are almost identical. You are correct that they have a lower internal resistance and can be charged at a much faster rate. This shouldn't cause a problem on the majority of vehicles as the wiring in the car is designed to handle the maximum rated ...


5

You need to confirm that timing is OK This forum thread looks to be talking about the same engine as what you have (3.4 L, 5 chains). According to the post, this is what you'll have to do: rotate the engine to TDC for Bank 1 (let's hope your 150┬░ of freedom allows for this) check that the timing notches on the cams are parallel to the cylinder head (from ...


5

The answer is one of: Friction For example, rod, main, balance or intermediate shaft, and/or cam bearings, oil or water pump, or piston rings are too tight. Re-assembly of dry clean components without using assembly lubricant will also cause excess friction. Compression Air pressure resisting movement. Removing spark plugs will help here (in this case, ...


5

Unless the rotor shows obvious signs of damage there is no way to tell by a photo. The only way to be sure is to measure the rotor with a micrometer. The most accurate method is with a micrometer specifically designed to measure rotors. The contact areas of the micrometer are pointed, this allows measurement at the base of any grooves. After the smallest ...


4

In short, the Porsche 956 made use of underbody ground-effects which modern-day challengers do not utilize to the same extent. The 'Ring is a very technical circuit. The lap times are not going to be governed solely on raw power; cornering speed is key. Ground effects gives so much grip that in the words of one '70s F1 driver, you can "paint the road" with ...


4

This issue might take some step-by-step diagnosis to find the source of the issue. Since it sounds like a repeatable issue, it should be able to come up with an educated root cause (instead of just throwing parts at the issue). I think Peter's suggestion is a good place to start (finding any fault codes in the ECU). After that, I would suggest testing the ...


4

I had a similar-sounding problem on a VW New Beetle. The car would start from cold fine, but after 15 minutes of running, it would be very difficult to re-start. It turned out to be a defective coolant temperature sensor. Replacing the sensor fixed the issue immediately. The computer was showing a code of P1296, which indicates a coolant-system defect.


4

If you planned on driving this more than once, I would replace all fluids in the car (oil, transmission/clutch, brake, coolant, power steering, etc.) I would then look over all rubber belts and tubes to make sure they are all still in decent condition, if not, replace. Vacuum lines need to be in decent shape also. Once you know your brake system is in ...


4

You can get it covered with epoxy primer. If you have many pits and cavities, it would be best to go over the areas with a wire brush and then shoot your primer. I recommend a wire brush for the pitted areas vs a typical sanding block as it will not penetrate areas with depth. If moisture is trapped in there, expect it to corrode through. It is best to ...


4

In 1983 there was a bypass where the GP track was being built giving a slightly faster circuit when the record was set but more importantly in 1984 N├╝rburgring grand prix circuit was opened so racing takes place there instead and for safety reasons racing cars, inc F1, etc do not run at full speed on the old track. Road legal cars are edging ever closer to ...


3

I have found that NPT is a US standard for pipes and fittings. There is a Wikipedia page showing different conversions of the NPT standard.


3

In addition to what already has been said by @Zaid, it could be added that, there hasn't been any revolutionary technological breakthrough in engine (internal combustion, jet propulsion or rocket) industry for half a century, even more. All the updates are small, evolutionary, iterations mainly connected with close looped, micro-controlled, electrical ...


3

This is a very known problem of this model (Porsche 924). Your WUR (warm up regulator) is faulty, and it needs to be changed. Read this link for more info: http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/443505-how-do-i-test-if-warm-up-regulator-bad.html


3

Let me also suggest that the backfire issue is related to ignition, not the valves. Check your timing, which you said you did statically, and also check to be sure the plug wires are in the proper place on the distributor. Easy to mess that up and it will cause a major odd firing of the engine. the above comments about fluids and tires is also on the money, ...


1

I put a AGM battery in my audi a4 1999 , and the computer got confused enough to throw up annoying symbols on the dash , like bulb out errors and the like , so i changed back to excide premium 90AH , I recon the cars computer just could't figure out what had changed ,with the AGM being able to be recharged 5 times faster than the standard battery , but no ...



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