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You remove all the plugs, open the throttle, and kick rapidly (or use the electric starter) until the gauge needle stops climbing. On a Triumph this usually happens in 4 to 5 .Includes bulletin boards and free classified ads for BSA, Triumph, Norton and much .The wedding band is just a sleeve . compression of the "white" bottom .Private Message - Compression test questions - Britbike forum
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This is Classic Triumph Forum for bikes pre-1983. Moderated by: John Healy. 2 .You remove all the plugs, open the throttle, and kick rapidly (or use the electric .
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Member Spotlight - Compression test questions - Britbike forum Can anyone tell me what the compression test pressure should be in a TR3A engine? With the engine warm, all 4 cylinders have 145 psi to 155 dry and 175 psi to 195 with engine oil in the cylinders. As I've had some blue exhaust smoke with warm engine, revving and idling, I did a wet test (some oil in each cylinder) to see if rings are the problem. Wet test readings: 145 155 .
A "perfect" cylinder would achieve about 125 psig (gauge) but compression efficiency isn't perfect but if you get around that number it indicates good. As others noted - low compression could be due to poor ring sealing, .
A compression test will tell you what you need to know if you take readings (with the same tester) throughout the life of the engine. That way you have a known baseline. . A cylinder leakage test is a much better diagnostic tool. Still it doesn't test the oil ring, but if compression rings are bad via the leak tester you know you have ring sealing .Remove all the spark plugs and use a compression tester to test the compression of each cylinder. Basically, you connect the compression tester to a cylinder and crank the engine .
1959 Triumph TR3A. 1967 Austin-Healey 3000 BJ8 "Healey". Topic Creator (OP) Aug 7, 2021 09:59 AM. Joined 9 years ago. 157 Posts. I just checked compression on my . There is no 'correct pressure' for compresison testing, as the instruments are neither built for precision nor calibrated. Look for an even, ideally +/- 5-10mmHg across the . The latest compression test results, after resetting the valve lash per a corrected Haynes manual are: # 1 190 psi # 2 170 psi # 3 170 psi # 4 160 psi
I attempted to do a compression test on my T140. I am not sure if I carried out the tests correctly but this is what I did and the results. I ran the bike for about 10min then connected the gauge to the right hand cylinder and started the engine. After a bit of a rev - 3000pm it gave 110psi, switched off engine and gauge stayed at 110psi .
1959 Triumph T120 Bonneville at The Art of the Motorcycle exhibition, Las Vegas. The Bonneville T120 was Edward Turner's last production design at Triumph [5] (in retirement Turner designed the Triumph Bandit/BSA Fury which did not pass the prototype stage before BSA went under [6]).The new motorcycle was conceived and developed so quickly that it was not included in . {Previously owned British vehicles: Two 1959 TR3A's, a 1957 MGA 1500, a 1975 Jaguar XJ6C, 1985 and 1986 XJ6 SIII's, 1988 and 1993 XJ6/XJ40's} Reply. Dave Russell Yoda - R.I.P. Gold . Offline. . TR3 broken pushrod &compression test: Triumph: 1: Jun 1, 2010: R: compression test procedure on 1500 midget: Spridgets: 5: May 24, 2010: F .
If compression comes up that means valve seats are not leaking. A wet test & a quickly preformed hot test are not exactly the same. Often compression test won't disclose oil consumption unless test is really bad. Back to the wet test, if the cly. is grooved, or the rings are broken or stuck tight into the grooves the wet test will have less change. Just finished a compression test on my rebuilt engine, and the numbers are: #1 210 PSI #3 200 #2 170 PSI #4 195 The factory workshop manual. Home. Forums. New . TR2/3/3A 1960 TR3A engine compression question. Triumph: 7: Oct 4, 2016: C: For Sale 1961 TR3A fuel tank: Triumph Classifieds: 0: Oct 14, 2024: For Sale TR3A Nose Panel: Triumph .
There is always a difference between dry and wet compression results. The oil improves the seal between ring and wall, but not at the valve seat. The test is to determine if a low compression is due to poor ring or poor valve seal, and the latter is clearly the case in bore 2. No significant change in pressure, so a bad valve seal. Also try re-running the compression test with adding a small amount (2 or 3 squirts from a pump oil can) of oil to each cylinder just before testing it. If the compression only comes up a little bit, then it's probably valves; but if it comes up a lot then it's probably rings. . 1962 Triumph TR4 "My First Triumph" 1962 Triumph TR4 "Big Red .
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pecon, Those readings on a cold motor sitting overnight are probably not out of line. Once the oil drains from the rings they can leak compression. That is normal. There is a place for cold compression test, but generally the best results are at operating temperature. On a warmed motor with 9.1 pistons you'd expect 175-180#. In this DIY Tech Tip from Lowbrow Customs, Todd shows you how to test your motorcycle's cylinder compression, and what it means. A simple compression tester which is available at most any auto parts store is all that is needed for this useful task. This can help identify compression loss, which has a MAJOR effect on the engine's power, due to worn .The Triumph Twenty One (also known as the 3TA) is a standard motorcycle made by Triumph Engineering Co Ltd in Coventry.The Model Twenty One was the first of the Triumph unit construction twin cylinder motorcycles. Rebranded as the Triumph 3TA in 1959 it continued in production until 1966 when it was survived by the Triumph T90, its sports version. [1] 2025 Classic Triumph Motorcycle Calendars by C.B.S - 10/25/23 4:04 pm New FAQ post: Problem posting photos . On the compression test, sounds a bit low. Are you checking with the throttles wide open? Wide open and several kicks to get a good reading, should approach 150 warm. Could just need a bit of running in to get the rings re-bedded properly.
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Here we see 9.5:1 geometric compression ratio would deliver 340psi pressure ( 23bar ) and temperature of 454C. This will be near to what we'd get in a running engien. In reality adiabatic compression is never achieved under starter drive, its too slow and heat loss is fast, but there is scope for higher test pressures above simple geometric values.
Make sure the throttle is wide open while doing a compression test. If the throttle is closed, the engine is being strangled and is trying to suck in and com. Road Test: Triumph 6T Thunderbird. by. . while an Amal Monobloc carburettor replaced the SU instrument for 1959, when the colour scheme became charcoal-grey and black. The following year brought the adoption of a twin-downtube frame with new front forks and petrol tank, and 18-inch diameter wheels. . An alloy cylinder head raised the . 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. .
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unplug and remove all coils. remove one or all plugs. one cylinder at a time install the gauge. it screws hand tight into the spark plug hole with o ring seal. then crank the engine 6 rotations or until pressure peaks. take reading. do all cylinders and cmpare cylinder to cylinder. the service manual will tell you the specs on cylinder compression specs.
Tracing its lineage from Edward Turner’s original twin-cylinder design, the Bonneville was conceived when Triumph first measured the effects of fitting a twin-carburettor cylinder head, high compression pistons and hot .
Good on ya Bushy, this puts at least three of us on the same page. The original question from Bergvw8 was: "My parts guy is spec'ing out EMGO Pistons that have a 8.6 : 1 compression ratio, but my new friend Haynes says that the ratio should be 7.9:1". He also posed this question at the same time: "Remember that it's +.020 --- does this sound right?" . Tracing its lineage from Edward Turner’s original twin-cylinder design, the Bonneville was conceived when Triumph first measured the effects of fitting a twin-carburettor cylinder head, high compression pistons and hot E3134 camshaft to its well-developed 649cc Tiger 110 motor.. The factory’s Experimental Instruction Sheet 419, dated 19 March 1958, . Compression Test I ck'd the Triumph Manual and could find nothing. The Haynes Manual states the following:-----Triumph do (does) not provide any figures for standard and minimum running compression. However, any engine in good condition should show 150 to 180 psi, and anything less than 120 psi is in need of attention.
If not valves or gasket issues. Compression testing only gives a rough guide to condition. More involv3d but not hard is a leak down test. With this you can test for rings, in valve, ex valve and head gasket. Due to the lower pressures you candifferentite between valves. Compression testing can seal a leaky valve. 1959 Triumph TR3A 1968 Triumph Spitfire MkIII 1973 Triumph 1500. Mar 9, 2013 10:13 AM. Top Contributor. Joined 12 years ago. . As a comparison for you, I recently did a compression test on my 78 spitfire 1500 and got compression readings of 140 lbs on three cylinders and 130 on one cylinder. Hope that helps. David
1959 Triumph TR3A 1963 Triumph TR4. Nov 28, 2022 05:22 PM. Top Contributor. Joined 4 years ago. . #2 went from 170# compression to 60#, not sure I can replace just one piston & liner.Higher compression put too much pressure on the lower half of the engine. . Maybe you have a bad valve on #2. You can have somebody do a leak down . 1959 TRIUMPH TWENTY-ONE HAS BATHTUB STYLING. The British home market had been hungry for cheap transportation after WWII, and commuter motorcycles helped fill that role. But England being.well, England, was wet and rainy and to prevent rust an owner needed to wipe his bike down each night after getting home from work. This was a chore that . 1959 Triumph Bonneville Drivetrain - 649 cc parallel-twin engine - 46 hp @ 6,500 rpm - Kickstart - Four-speed gearbox The real selling point on the T120 Bonneville was the beating heart and the .Today I am testing the engine compression on my Triumph Bonneville T140. The bike is running fine, but I want to do a baseline test to check the compression .
At the time this bike was released it was the fastest production motorcycle at 115mph.
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1959 triumph compression test|Triumph TR2