boldy205 75 Posted April 2, 2006 (edited) i have finaly treated myself to an Mi for my 205, while it is still in the 405 i thought id run a quick compresion test, from the cambelt end i got: 150 160 160 150, what should i be getting is this about right?? bearing in mind theres no history of a rebuild and its covered nearly 130k!! thank for any coments. matt. by the way its a non cat model. Edited April 2, 2006 by boldy205 Share this post Link to post Share on other sites
Rippthrough 98 Posted April 2, 2006 i have finaly treated myself to an Mi for my 205, while it is still in the 405 i thought id run a quick compresion test, from the cambelt end i got: 150 160 160 150, what should i be getting is this about right?? bearing in mind theres no history of a rebuild and its covered nearly 130k!! thank for any coments. matt. by the way its a non cat model. Looks absolutely fine to me. Share this post Link to post Share on other sites
Jonmurgie 2 Posted April 2, 2006 I've seen people report upto 200psi for the Mi but I think it's the fact that your getting nice exual readings across all 4 that would suggest it sounds OK Share this post Link to post Share on other sites
boldy205 75 Posted April 2, 2006 great, think i will take the engine out next week then, thanks for the replies. matt Share this post Link to post Share on other sites
Mongo 0 Posted April 2, 2006 great, think i will take the engine out next week then, thanks for the replies.matt was that with the engine hot or cold? Were you also pressing down the accelerator while turning the engine over as well? id expect to see around that with either a cold engine pressing the accelerator down while turning the engine over, or a hot engine with no pressing the accelerator down. Either that or it wasnt creating an amazing seal in teh spark plug hole (oil the rubber grommit) as without a decent extension bar its quite a bugger getting them down the spark plug holes as its quite long. Share this post Link to post Share on other sites
Guest Bishop Posted April 2, 2006 boldy205, My mates got a Mi16 D6C (160hp) as well. It's in pretty good nick as it was almost never thrashed, belonged to an elderley couple before. Has about 80,000Km give or take in it. We did a compression test, dry, not shure about the throttle. The readings were clearly based around the 200psi range. No way as even as your's, but clearly it should be making more. Although you wont be dissapointed in you're Mi16, I guarantee it. It's an animal. Share this post Link to post Share on other sites
Dream Weaver 2 Posted April 2, 2006 Compression readings mean jack in my experience. My old Mi unit the chucked blue smoke out like a good un and had knackered rings gave 180 psi across the cylinders. My new unit which doesnt use oil has lower readings. Share this post Link to post Share on other sites
tidypug 5 2 Cars Posted April 3, 2006 doesn't it depend which rings are shot though? Share this post Link to post Share on other sites
Jer309GTi 3 Posted April 3, 2006 I did the test with boldy205. The test was done on a stone cold engine, with no throttle. It did smoke a bit on full throttle when we drove it home, so thats why we did the test. The car has only done journeys of a mile or 2 every few days for the past god knows how long so would this make the engine a little smoky until it gets a good thrashing? Share this post Link to post Share on other sites
KRISKARRERA 2 1 Cars Posted April 5, 2006 with no throttle.Never tested how much difference that makes but it's suppose to make some difference isn't it. Share this post Link to post Share on other sites
boldy205 75 Posted April 6, 2006 so what kind of differance is holding open the throttle going to make? higher or lower compression? Share this post Link to post Share on other sites
KRISKARRERA 2 1 Cars Posted April 6, 2006 Higher. How much higher I don't know - I've not been bored enough to to a back to back test. Share this post Link to post Share on other sites
Mongo 0 Posted April 6, 2006 Higher. How much higher I don't know - I've not been bored enough to to a back to back test. Stone cold engine, no throttle - 115psi Warm engine, throttle - 200psi on my mi, i was bored and it was partly snowing when i done it! Share this post Link to post Share on other sites
mbayley77 0 Posted April 7, 2006 Cold engine no throttle 150 PSI Hot engine full throttle 150 PSI On an Mi running twin 45's Share this post Link to post Share on other sites
James_R 3 Posted April 8, 2006 Compression test's are useful if you do a warm dry and then a wet test, to see how much you gain from adding a little oil to each bore to check ring seal, so if you get 160 dry then 200 wet it shows poorly rings. Smokey when driving says stem seals, Mi's seem to cabury's them from what I've seen. Newer engine showing a lower comp test, does it have more overlap on the cams?? Share this post Link to post Share on other sites
