mgb compression test readings|Compression Testing : OEM Compression and plugs have very little relation to each other. The small wire plugs are not optimal for MGs even if you have electronic ignition and a 40,000 volt coil. NGK BPR6ES. I am concerned about compression on #1. On . WEBWho we are Management Further Education. At the heart of one of Europe's leading technical universities, we combine management and technology knowledge in a wide range of further education programs for young professionals and executives.
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Try propping your carbs open a bit while taking your compression readings. If the throttle butterfly is closed and the bushings are so good they don't allow any air in, what will . Compression and plugs have very little relation to each other. The small wire plugs are not optimal for MGs even if you have electronic ignition and a 40,000 volt coil. NGK BPR6ES. I am concerned about compression on #1. On . The normal compression range for a late MGB is 120-150, depending on mileage. 100 is very, very low - ready for a rebuild.
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Compression check on all 4 cylinders on a '77 MGB. Applies to pretty much all old engines. Mine came out to be in decent spec, but #2 is about 7.5% lower t. I'm really trying to push my YouTube channel forward for 2020, if you like the videos it would help me immensely if you would be kind enough to subscribe to . A compression test will tell you if your engine has good compression. An engine is essentially a self-powered air pump, so it needs good compression to run efficiently, cleanly .From the Workshop Manual high-compression engines (8.8:1) should be 160psi and low compression (8.0:1) 130psi for 18G engines. 18V high compression are slightly higher at 9.0:1 and 170psi at 275rpm.
If your car has SU/s, and you want to test it properly, take carb tops off and slip pistons out. So when you floor pedal, you are actually getting true atmospheric air in. While .
Join me to see how it does! I get the oil, filter and spark plugs changed on the MGB, adjust the tappets and give it a fighting chance of passing a compression test. After Saturday's spirited Fall Foliage ride ( a little over 200 miles including the commute) I decided to give it a quick check-up. Since I had the plugs out a compression test seemed a good idea. Dry HOT test results: #1 - 155 #2 - 150 Hello just did compression test on my GT, 72 engine stuck in a 67 body. What can you tell me about the results. 'cylinder 1. 85 psi, 2. 70 psi 3. 122 psi 4. 62 psi I did each cylinder twice. . If the new readings are the .
However 50 psi of compression is just not enough for any gasoline powered engine to run properly. To determine if it’s the piston rings that are causing the loss of compression you should do a “wet compression test next. Do this by adding a squirt of engine oil to the cylinders through the spark plug hole and then repeat the compression test. Readings dry cylinders 1-34 were 130, 110, 140, 135. After putting a little oil in the cylinders readings were 150, 125,150, 150. Those readings don't seem too bad to me. I'm hoping when I get around to adjusting the valves #2 reading will be closer. Anyway, I was considering replacing the engine prior to doing the compression test.If your engine runs bad, misfires on one or two cylinders, has rough idle, low compression, or may be losing coolant, you can do a compression test. For a stock engine, compression pressure at cranking speed should be in the 120-145 psi range (as high as 175 for flat top pistons). Compression should be the same an all cylinders within about +/-10%. I found that the plug in the #3 cylinder was black. Finally got around to a compression test today. First time I've done the test on this car since buying it in 2019. Cylinder 1 = 100psi Cylinder 2 = 120psi Cylinder 3 = 130psi with the blackened spark plug. Cylinder 4 = 130psi Happy to see #3 had good compression.
Had the car at a friends place today and decided to do a compression test "just for the fun of it". All cylinder checked out within 1psi of each other at 125psi. I was expecting higher around 160psi. Did a little research and found from the engine number that I have a Low Compression engi
What would be the expected results in psi for a compression test using an OTC compression tester on my late '53 TD? The engine was rebuilt March 2017, and running well with about 2000 miles on the engine. . He was getting around 130 psi on an late model 4 cylinder MGB in the video. . A pressure reading depends on multiple factors. Elevation . Low compression in one cylinder usually indicates a bad exhaust valve. Low compression in two adjacent cylinders typically means you have a bad head gasket. Low compression in all cylinders would tell you the rings and cylinders are worn and the engine needs to be overhauled. Either way an abnormal cylinder reading indicates a problem. Hello All. I had the cylinder head rebuilt on my late 67 250SL (117k miles) because it had very varied compression test results. Also, a leakdown test on some cylinders showed valve leakage (and some bore wear). The compression readings (hot) were 1:127, 2:140, 3:140, 4:137, 5:150, 6:160. These results were repeatable.
Although if they were extremely loose may cause low compression readings. {they would be extremly noisy while the engine was running} {If it ran at all}. My suggestion is re-adjust the valves {a little loose is better than too tight} .
A high compression (HC) stock engine would have a psi range of 160-165. With the flat topped pistons and your compression range, it would appear that you have the latter - and one in good shape at that. It is curious that the manual lists the compression ratios but doesn't list a compression range in psi.They did a compression test that came back 130/125/130/125 - the engine number has an "H" in it - which I believe means it should be a high compression engine and the compression should be closer to 160. . There are many variables which will affect the readings, so all I look for is a group of values that are in the right range and close to .
i purchased an MGA with a motor that won't turn. It's not the original motor anyways so I have a 1977-80 Mgb motor to drop in. The motor I am dropping in is the later de smog type motor probably with dished Pistons. I did a compression test and got the following: cylinder 1 100 psi, 2 is 90 psi, 3 is 90 psi, and 4 is at 105 psi. John Twist demonstrates the proper method of taking compression readings from an MG engine. Today before it got dark I did an engine compression test real quick. MGB 1976 - 27070mi on rebuilt - recently adjusted valves, cold @ 0.15 - measured on warm engine with air filter on - measured with 6 strokes on ignition (5sec) . Compression readings are overrated. Member Services: dbraun99 LLC www.dbraun99.com. I want to purchase a good compression gauge so that I can test a 1979 MGB's engine compression. Which one would you recommend? I found the following gauge on Mossmotors: . In some cases badly worn rings will give acceptable compression readings. A compression guage doesn't simulate an engine running, Combustion pressure is much .
Re: Worrisome compression test results on my MGB 1 William - Rivergate are good people who definitely know MG's, more about Midgets than B's; but they know our cars (they're the ones who designed the 5-speed conversion for a B) - but I am surprised they'd call for a lighter oil than 20W50! Same follows if the head is a CAM1106, except the intake is the smaller 1.5625 intake. Ultra low compression is also possible with 16.2cc dish pistons and the earlier head. Either the 12H906 or the 12H 2389 with 43cc combustion chambers will give about 7 to 1. You could just check the compression and 150psi or greater should indicate high .Connect compression gauge to #1 cylinder. Have assistant crank engine (ignition switch—off) through six compression stokes with the throttle wide open. * Needle should jump six times. Record the highest reading. Repeat on other cylinders. Interpretation of Readings (Step 2) The MG factory never published pressure readings for compression checks. Higher PSI readings from the test usually indicate better engine performance, although the ideal reading varies between vehicles. . Next, switch off the engine, remove the fuel pump, and disconnect the spark plugs. Attach the compression test adapter into the cylinder nearest the front of the engine, then connect the gauge to the other end of .
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The high compression engines such as your '66 will only achieve about 160# compression wet or dry when new, so your readings are good. If you are concerned that adding oil did nothing to raise compression test numbers, do a leakdown test, as perhaps there is some leakage around the valves, but with those numbers, I would be happy. Today was the day. My GT has about 600 miles on the rebuilt engine and it was time to check the head torque and adjust the valves. Afterwards I did a cold compression test. Got 155 on #1 and #4, 150 on #2 and #3 with throttle closed (idle). Opened the throttle and redid the test. Got the exact same readings. Closed the throttle again, same . Caution 1. When you crank the engine, keep away from the spark plug mounting holes. 2. If a compression measurement is performed with water, oil, fuel, etc. in the cylinder due to the cracks in the cylinders, these substances heated to a very high temperature will blow off the spark plug mounting holes and could be dangerous. Doing a compression test, is a good way to measure the condition of, the rings, cylinders, and valves. So, if your engine is running rough or is lacking power, consider doing a compression test. Also, it is important to perform a compression test every time a tune-up is done, as part of preventative maintenance.
MGB & GT Forum. Sign In Create Account. Compression test. . fuel pump disconnected I proceeded to do a compression test this was a cold test and it returned all cylinders giving 130psi this is a 1972 BGT with a 18v stamped on the block running a modified head too run unleaded fuel . An excellent reading on a US 18v with 8:1 pistons is 135 . While I'm at it, I ran a compression test. Results: Cyl 1: 135 lbs. (not bad, not good), Cyl 2: 165 (good), Cyl 3: 135, Cyl 4: 160 (also good). This tells me a couple of things. First, while there is no engine number plate, and I know it is not the original engine, it appears to be an earlier, high compression engine.
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mgb compression test readings|Compression Testing