mgb engine compression test|MGB Worrisome compression test results on my MGB 18GK : purchasing 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.
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how to / compression test : MGB & GT Forum : The MG Experience
Today's compression test resulted in the following. Warm Engine, Dry test, throttle and Air valve in closed position. #1 - 120. #2 - 110. #3 - 110. #4 - 110. I am happy to see the consistency but expected to see higher numbers. . Anyhow, my car's a 1974 MGB with an 18GK engine. The engine was rebuilt just over six years ago, and if I've counted correctly, it has less than 15k miles on it. The HS4 twin . 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. Does any one know if these are decent numbers? Any input from the experts is appreciated. 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 .
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 . 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 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. Join me to see how it does! .more.
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 .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 . We bolted the kit onto our 1978 MGB test mule and put it through its paces. First, we ran the kit straight out of the box as delivered from Moss. Then we pushed it further with more boost, more camshaft and an improved cylinder . 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. Does any one .
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 and to start easily. As a rule, most engines should have 140 to 160 lbs of cranking compression with no more than 10% difference between any of the cylinders. Our 1973 MGB GT had a rebuilt engine with about 20,000 miles on it. We suspected the engine had a higher than normal compression ratio, however, because even with unleaded premium fuel it pinged under load. A compression confirmed those suspicions, yielding readings of 190 to 200 psi per cylinder. Checked the compression in the cylinders. Took plugs out and checked each cylinder in line and wrote down the readings (i mistakenly noted bar rather than the psi reading) – when converted the readings are about 180psi which represents 10:1 compression ratio which is good and quite high. A previous owner had the engine bored.
Pull plugs. screw tester into hole #1 get in car. Floor the pedal. Crank 1-2-3-4-5 "uhhhnnnh"s Maintining constant number of engine spins is mildly important. if the value after 5 is 150, the value after 1 is likely to be 120-130, 2--130-135, etc. Picking up a . However, the 12H 3508 engine casting number is almost certainly an 18V engine, unless its a very late (1971) 18GK engine (Engine # 18GK RWe-H/14,365 and later) which used that engine block castingas well (although with studs to .
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
However, a clue might be that if you run a compression test and have numbers on the order of 180 then you likely have an HC engine. If your numbers are on the order of 120 then you likely have an LC engine. . 68 MGB rebuilt engine D9 cam balanced, still a work in process but runs real nice. 88 Saab SPG Turbo 86 Vanagon Westy (South African .
Before you can perform a compression test on your car’s engine, you’ll need to run it for 5 to 10 minutes to bring it up to its normal running temperature. 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 .
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.John Twist demonstrates the proper method of taking compression readings from an MG engine. 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. 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.
Re: Worrisome compression test results on my MGB 1 Valves that are too tight {Or Burnt} can cause compression loss! Valve guides or guide seals, I wouldn`t think would cause any significant compression loss. {Unless the guides were EXTREMLY worn then it would smoke blue smoke horrendiously on start up}
MGB Worrisome compression test results on my MGB 18GK
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) DRY : 1-135 2-125 3-125 4-128 WET : 1-135 2-125 3-125 5-130 . 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. In an online John Twist video he recommends cranking 10 times before accepting a result, and removing all spark plugs before measuring. He .
Took compression test, warm, WOT, 1-153 2-149 3-155 4-160psi. Sorry for the long post, just trying to give detail. If you have any ideas of where to look, I'd appreciate it. I love the car but I'm missing a good chunk of the summer and can't even tell if it is fuel or spark related!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. . MGB compression was dictated over the years by the dish in the piston and the combustion chamber size (based, in turn, on the casting of . 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.If gauge reads low on first stroke and builds slowly never reaching the minimum psi: bad news; that cylinder fails the compression test. The rings are probably bad. Confirm by conducting a wet test. Squirt a tbs. of motor oil into the cylinder. Crank engine a few times to spread oil. Conduct another compression test. Higher reading confirms bad .
Engine-wise, I’ve converted the carb, exhaust, and PCV system to a 1968 set of HS4’s, stock manifold, tourist trophy sport exhaust and the proper 1968 mushroom pcv valve. I’ve done the umbrella valve stem seals, re-sealed the oil pan, dipstick tube, valve cover, cleaned the mesh in the tappet cover and re-sealed both of them. 1974 MG MGB - full technical specs sheet, including performance data, economy and emissions, dimensions, weight and engine particulars. . Engine construction: sump: compression ratio: 9:1: Fuel system: 2 SU carbs: bmep (brake mean effective pressure) 985.5 kPa (142.9 psi) Maximum RPM: crankshaft bearings: Engine coolant: Water: Unitary .A compression test is simple to learn and only requires a few basic tools. From a mechanical perspective, you will need to know how to properly remove the spark plugs on the vehicle or equipment you are testing and properly disable the ignition system and fuel system, the latter if the vehicle is fuel injected. For carbureted engines, you can choose to disable the fuel supply .
In reply to # 2731865 by lil.red.roadster It would help if you could post the car details as you may/may not have a ballast resistor fitted (Different coil) anyway. The only sensible test of a coil is the resistance of the primary - across the two small terminals! For NON-ballast around 3ohms, ballasted about 1.8 John Twist discovers a 1976 MGB with faulty compression.
instron tensile compression tester model 4481
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mgb engine compression test|MGB Worrisome compression test results on my MGB 18GK