1275 compression test|1275 compression ratios and horsepower : manufacture I got 120 on all cylinders on my low compression 8:1 1275 engine. My Sprite/MG Midget Handbook and Service Manual lists a compression of 120 for a 8.8:1 1275 engine .
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results of compression test : Spridgets List Archive : The Austin
Let it set for about 26 hours, blew it out, and did another compression test. This time my results were 100, 110, 110, and 130 from the front to the back. What should these results tell me about my 74 midget?I got 120 on all cylinders on my low compression 8:1 1275 engine. My .My 1275 history is a bit of a mystery as there is no engine No. Does anyone .I always assumed my 69 GAN4 1275 had a 8.8-1 compression ratio because of the .
hi, i have just bought a clubman with a 1275 engine. i want the engine for my other mini and will check it over before i fit it. i did a dry compression test it last night and and got . I got 120 on all cylinders on my low compression 8:1 1275 engine. My Sprite/MG Midget Handbook and Service Manual lists a compression of 120 for a 8.8:1 1275 engine . My 1275 history is a bit of a mystery as there is no engine No. Does anyone know why the compression is about 220 psi on all 4 cylinders - and what damage might this do to the engine? Thanks, Steve.
The simple way to figure this out is to divide 1275 by 4, which = 318.75cc. Then to find out what static volume you need, subtract 1 from your desired compression ratio (9.5 - 1 .Posted 21 January 2010 - 06:51 PM. Hmmm - 150 is 'just' ok - the fact they picked up with a wet test does show the rings/bores are a bit worn. If they had all been 180 dry - that would have . a lot of oil, perhaps more than you should be for the test. Remember that in a 1275cc engine with approx 10:1 compression the combustion chambers are in the order of 30 . Without a doubt, my friend's compression tester, which is a Draper, is better than I bought now, which has been very cheap. Anyway, there is a big difference between the .
I always assumed my 69 GAN4 1275 had a 8.8-1 compression ratio because of the specifications listed in the General data of the original owners manual. The manual recommended fuel with octane ratings of at least 94. So I .Aside from getting it running, it's in great shape body and interior wise. The owner has some invoices from 2005-2009, and one of them was an engine tune up (ignition, fluids, etc). On this . I just completed my last compression test. The first compression test measured 90psi at each cylinder. I followed the advice of a wise sage on this forum Ian) and poured some transmission fluid in each cylinder. Let it set for about 26 hours, blew it out, and did another compression test. This time
•Normal: Compression builds up quickly and evenly to the specified compression for each cylinder. •Piston Rings Leaking: Compression is low on the first stroke. Compression builds up with the following strokes but . In addition to the 'dry' compression test, follow it up with a 'wet' test (i.e., squirt a little oil in each spark plug hole before pulling compression)..that'll tell you, if there are problems, where they are - valves or cylinders. . 1275 Compression, Camshaft, et al: Spridgets: 16: Apr 28, 2013: Compression results - Worth Rebuiding .
He gets into the specs on all the various engines up though 69. The 1275 engine compression ration changed from GAN4 MKIII to GAN5 MKIII. The piston dish changed. The 1969 1275 GAN4 was a 8.8 compression motor and GAN5 1275's were 8.0 compression. 8.8 required 94 octane and 8.0 91octane. Please correct me if you know different.
How to guide - Classic Mini Compression TestIn this video i take a look at how to check for compression using the Gunson Compression tester, following my Min.
1275 compression. Posted by rhodyspit75 . Page 12. Topic List Forum List Newer Older Start New Topic. 1275 compression #1. This topic is about my 1960 Austin-Healey Bugeye Sprite. . I decided to do a compression test today and number 1 & 4 are at 145 pounds and 2 & 3 are 120. I put oil in the two low cylinders and it only came up a little.
Page 1 of 2 - 1275 Compression Ratio - posted in Problems, Questions and Technical: hi all, i've got a 93' 1275 carb engine, as you may know these engines run a lower compression ratio than the coopers etc, would i be able to have the head skimmed to raise the comp ratio to a decent level or is it a case that the pistons in my engine are low comp ones? 1275 compression test high. Posted by Berks4x4 . Topic List Forum List Newer Older Start New Topic. 1275 compression test high. #1. This topic is about my 1973 MG Midget MkIII. Berks4x4 Steve Paterson. Ascot, Berks, UK . Sign in to contact. 1973 MG MGB 1973 MG Midget MkIII. Topic Creator (OP) Compression Test 1275 Boc - posted in Mini Chat: Hello all, I did a compression test on my 1275 carb British Open Classic yesterday. Car is from 1992 and has 120 000 miles. I dont know if block/head were already rebuild. Here are the results (warm engine, full throttle): As pressures increased when I added oil, I guess rings or bore are a bit worn out? a lot of oil, perhaps more than you should be for the test. Remember that in a 1275cc engine with approx 10:1 compression the combustion chambers are in the order of 30-40ccs, which is quite small. Adding even 10ccs of incompressible oil can make the compression extremely high for the remaining space.-- Trevor Boicey Ottawa, Canada (email redacted)
On my freshly re-built 1275 there is some positive pressure coming out of the oil fill. Hooking the front cover breather to the y-line to the intake didn't work for me, it still leaked. . Ok have done the new compression test with plugs out and throttle open readings were as follows from front to back #1 was132, #3 was115 #4 was 90 #2 was 90 .
Compression Test. 1275Cc A Serie
1275 engine compression. Thread starter 6sprite9; Start date Jul 19, 2008; Share this page. Facebook X (Twitter) Reddit Pinterest Tumblr WhatsApp Email Share Link. 6. 6sprite9 Freshman Member. Offline. Jul 19, 2008 #1 does anyone know how much cyl. psi a 1275 austin engine should have to run properly? currently at 120-125 psi. thanx, bob. Reply. 1275 compression test high. Posted by Berks4x4 . Topic List Forum List Newer Older Start New Topic. 1275 compression test high. #1. This topic is about my 1973 MG Midget MkIII. Berks4x4 Steve Paterson. Ascot, Berks, UK . Sign in to contact. 1973 MG MGB 1973 MG Midget MkIII. Topic Creator (OP)
A flat top 1275 under the stock 62cc chambers of 2004+ 1200 heads delivers a 10.25:1 compression ratio, which isn't a bad place to be with the 560 cams. However, the EFI bikes can push it a little higher, you can actually run the 10.5:1 domed pistons with the IMPACT 560 cams for even more power than shown above. Over the years, there have probably been a dozen stock 1275 pistons. Currently, three different designs are available from AE/Hepolite as stock replacements. All have an 8.4cc dished top, but compression ratios are . 1275 compression test high. Posted by Berks4x4 . Topic List Forum List Newer Older Start New Topic. 1275 compression test high. #1. This topic is about my 1973 MG Midget MkIII. Berks4x4 Steve Paterson. Ascot, Berks, UK . Sign in to contact. 1973 MG MGB 1973 MG Midget MkIII. Topic Creator (OP) 1275 compression test high. Posted by Berks4x4 . Topic List Forum List Newer Older Start New Topic. 1275 compression test high. #1. This topic is about my 1973 MG Midget MkIII. Berks4x4 Steve Paterson. Ascot, Berks, UK . Sign in to contact. 1973 MG MGB 1973 MG Midget MkIII. Topic Creator (OP)
1275 posts Compression gauges very a lot, so just one reading in the absence of any reference point is pretty useless. I ONLY use compression gauges to look for consistency across cylinders in multi-cylinder engines. All the writing that went into the responses to this thread probably took longer than it takes to do a top-end on a 125 sx. In all my years messing with the A-series engine I only had one head that failed me and that was a 1275 Cooper S head AEG163 and they were know for cracking in between the intake and exhaust seats. . smog head on my 74 Midget with a 12G940 that I bought on eBay for 0.00 and it came with hardened seats. Anyway, the compression test will .
1275 engine compression. Thread starter 6sprite9; Start date Jul 19, 2008; Share this page. Facebook X (Twitter) Reddit Pinterest Tumblr WhatsApp Email Share Link. 6. 6sprite9 Freshman Member. Offline. Jul 19, 2008 #1 69 austin 1275.how much cyl.psi should this engine have in order to run properly? thanks. Reply. R. RonMacPherson Guest. Guest.It was to this end that I carried out the 1275 engine build detailed in the relevant articles, and to prove that having to go out to 73.5mm bore (1380) isn't an absolute necessity to have a blistering street performer. . valves sticking in guides, compression test, leak-down test, manifold air leaks, carb condition, fuel supply, everything .Tech - Compression Ratio Calculator - Classic Mini DIY
1275 compression. Posted by rhodyspit75 . Page 12. Topic List Forum List Newer Older Start New Topic. 1275 compression #1. This topic is about my 1960 Austin-Healey Bugeye Sprite. . I decided to do a compression test today and number 1 & 4 are at 145 pounds and 2 & 3 are 120. I put oil in the two low cylinders and it only came up a little.
tend to find them with 80k on the clock 175psi on cold engine is fairly good, the turbo engines tend to be higher as direct injection compression ratio higher as well, its worth doing a cold engine test and an hot engine test see what happens with it, have seen weak rings loose compression under heat loads, also if have low reading put a syringe full of engine oil in . 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.1275 BMC A Series Engine - Low Compression . Looking into picking up an old MG Midget for a project, and it's been sitting for about 10 years. Aside from getting it running, it's in great shape body and interior wise. . On this invoice, the compression test read, from 1-4, 130-125-75-90. The owner didn't do anything to resolve this issue and .
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1275 compression test|1275 compression ratios and horsepower