Pull the heads & inspect, or put a camera down in there... pull the dipstick while running and see if it smokes like a BBQ. The results from the sides of all cylinder walls tested, was basically the same resistance as the baseline, with lubricated piston movement, including cylinder #6. Bore Scoring Article GT Porsche. These marks have a look similar to a "scored" cylinder, yet have no physical damage to the surface and will not cause any harm. What I think you should do is get a brake hone, its the type that typically has 3 arms with a long stone on the ends. These failures are more often misdiagnosed than properly diagnosed, and can lead to lots of wasted money when the symptoms are mis- identified and local shops, or dealers just start replacing parts thinking that the issue is not mechanical. In regard to the cylinder bore scoring failure, 90% of these will have a new “air oil separator” fitted. Though LN supplies prepared engine blocks for other builders you may run across in your research, our profiles of piston, ring, and cylinder roughness average cannot be attained by those other builders. Incorrect valve recess. The noise will have the same rhythm and tone as a typical hydraulic lifter issue. 2. It is often at this time that thousands of dollars become wasted, performing a “lifter job” that does not address the issues at all. A side load of enough magnitude can result in tube scoring, piston rod, and rod bearing wear, and even seal failure. The pitting can and will cause stress risers to develop in the liner, potentially leading to cracks and premature liner failure. Now is this considered bad? Noticed it in a Cayman ad and the engine had been replaced due scored cylinders. This is no challenge for us- its another day at the office for our team, as we have build more engines afflicted with this mode of failure than anyone in North America. The cylinder walls are the surfaces of the holes in the block that are bored out for the pistons. 1: Ball hones correct sized work fine for deglazing a 2stroke cylinder. Trust that it is not in 95% of the cases we have seen first- hand. Thats right, our processes were borrowed from the Mezger engines, and in fact we used these same procedures to create our Mezger based Porsche engines here. Without a stock feeler ribbon, I used a splice of paper. Why? 5. If an engine had scored cylinders how would the engine behave? The cylinder was used again because it was surprisingly still in good shape! This makes the most common failure also end up being the cheapest failure to overcome. Well I know one of the quickest ways to ruin one is to run without an air cleaner that will score a cylinder and piston super quick and you are correct not the right oil gas ratio can do it too. You should not either. Raby Engine Development. Wear debris from the scored bores is very hard, and abrasive. Pulled the heads for an AFR swap and felt this when wiping the cylinder walls with a fresh oiled rag. What you must understand is this condition will not get any better over time. Marks may follow the ring gap but have no depth or damage to the cylinder bore wall. The rings expand against the cylinder wall and seal the combustion chamber. Why would a cylinder that’s having issues test better than the others? Also, the amount, type of liquid and how it got in, will have a major effect on what happens. Wrong. There is lots of speculation as to the cause. Nikisil is comprised of Nickel, Silicon, and Carbide, and is applied as a “plating” procedure. Dark tail pipes will be seen. ), A noise that “sounds like a lifter” (often misdiagnosed! It can be compression, oil, hydraulic fluid, water, steam, etc, etc. (Not always notable! Those that lack extensive, direct experience with the M96/97 engines may still believe this is a failure of a valve lifter. There’s no way around this- no magic cures, no special oils, or potions. Not a KBB value, not re- sale value, and not what their friends think about their Porsche. The unique CSL formula fills in worn areas of the cylinder walls to reduce blow-by and RESTORE compression to near original levels. Further, fuel contaminated oil then loses its ability to protect the engine components, further increasing wear throughout the engine, as well as the cylinders. Put simply- you don’t want that to happen to you. Wise purchasers will choose our services, taking advantage of our developmental work with LN Engineering’s “Nickies” cylinder line. Here I am happy. This carbon is very damaging to any components that it may encounter, so continued driving of vehicles with cylinder scoring (even if they “run perfectly”) can create extensive collateral damages. Carbon deposits on … There’s no engine oil that will solve this, and there’s no single part that can be changed out to solve this condition. Piston protrusion too great. Stuck piston rings are uncommon, but they do occur. ...Blowby is good times. In my old Aston Martin DB4 I had SU carbs with a wire mesh for an air filter.The wire mesh wouldn't stop anything from entering the engine. Thats why i do wonder whether if you were to examine the bores on lots of apparently healthy 911's that you would see some bore scoring but you don't know because there are no obvious symptoms. July 5, 2016, 9:25pm #8. He should measure it and bore to match it. Also what would cause scored cylinders? This failure will then be deemed “D- chunk failure” where the cylinder literally breaks, allowing coolant to flood the engine internals. Never use a steel sleeve to repair this issue, as the expansion coefficients are incorrect, the engine will always be noisy, and will likely have more issues than the process solved. The amount of miles that your car has logged means nothing to this failure, as we have seen this occur with engines with less than 20,000 miles, and with engines as high as 260,000 miles. Engines operated with scored cylinder bores will suffer multitudes of collateral damages due to this wear debris being suspended in the engine’s oil supply, and being circuilated to all internal components. A rythmic ticking noise that sounds similar to that of a hydraulic lifter; One exhaust pipe has more soot than the other; Increased oil consumption If caught at early onset we may be able to save your engine without full reconstruction! Obviously, this is a crucial area of a motor, since the pistons and rings slide up and down against this surface as the motor is running, usually at many thousands of RPMs. 4. Scored cylinder liners may be caused by broken piston rings, a defective piston, improper cooling, improper lubrication, or the presence of foreign particles or objects. If you use a microscope to look at a side view of a freshly honed cylinder wall, it might look a little like a hash of sharp lines like those earthquake seismograph plots that Californians are conditioned to viewing on TV. Worn Main Bearings Causing Oil Consumption. 0.50 is 1/2 mm or about 0.020". The cause could be a missing or ill-fitting air filter. 100% of our engines have used LN “Nickies” since the beginning of our program. If you are like me, you understand that the 996 and 997 are the best water-cooled cars to own, as long as you give them a new “heart”. Typically, since no scoring is visible, it supports the aforementioned narrative that the failure is a “lifter”. Why? Engine misfires are a common occurrence with diesel engines but the good news is that they are typically an easy issue to diagnosis. That’s right, I said LOVE. Rear the full discussion on cylinder bore scoring with the M96/M97 Carrera engines in the March 2015 GTPorsche magazine, by Peter Morgan. Rather than conclusively determining the condition of the AOS with a testing regimen using a crankcase manometer reading, they simply throw a new part at the engine. A scored cylinder in anything will result in what the seal is trying to keep sealed to leak by. Pull the heads & inspect, or put a camera down in there... Sand/grit through the air cleaner. The metal-to-metal contact smears the metal on the skirt on the piston and damages the piston. Look For Scoring. Seen here is a 997 C2S engine undergoing rebuild for the well-known problem of cylinder wall damage, more commonly known as scored bores.

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