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| disappointing comp test #'s https://slantsix.org/forum/viewtopic.php?t=12701 |
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| Author: | argentina-slantsixer [ Wed Apr 20, 2005 8:46 pm ] |
| Post subject: | disappointing comp test #'s |
Hey there I got my first comp gauge, so I decided to do a comp test since I've been having funny problems. First of all I have to say that I purchased a taiwanese gauge (oh, yeah, I'm cheap) in my defense the only thing I can claim is that piece of junk wa the only thing I could find down here. Well, I removed all the spar plugs, the coil to dist cap wire and started working. Engine was hot like for setting valvle lash. cyl 1 was 98 PSI, #2 was 110 PSI, #3 was 95 PSI, #4 was 100 PSI, #5 was 115 PSI, #6 105 PSI. SO I went nuts and decided to do a wet test. #1 100psi #2 110 psi #3 100 psi #4 105 psi #5 120 psi #6 105 psi. I'm looking over blown head gasket and r burnt valvles am I? I ended up so upset that I retorqued the head to 11kg, with minor changes when remeasured. When I finished my mill it had around 160 psi, give or take a few pounds, but I didn't measured those #'s with my ne gauge. No oil leaks, no coolant leaks, no mixed fluids, sometimes I get a gas smell coming from the engine and it ain't carb or stuff like that. I do have a li'l bit more oil consumption, but I moved to synt 5W40 oil in my last change. I do have some come and go overheating problems (not major problems but still are there) Any words? |
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| Author: | Dart270 [ Wed Apr 20, 2005 9:24 pm ] |
| Post subject: | |
Hmmm, that's a big drop, and across all cyls... Possibly the gauge is wrong, or the original gauge was wrong? A common reason for low comp readings is tight valves, but that is usually different for every cyl. Adjust lash? New cam? Stretched T chain? They are consistent, so you are looking at a symmetric problem (same for all cyls). Head gasket wouldn't do it, and burnt valves show up one or a few at a time... Lou |
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| Author: | drrw [ Thu Apr 21, 2005 11:09 am ] |
| Post subject: | |
I would either take the gauge back and get another one to see if it's different or get someone with a known good gauge to measure. Where was the 160 reading from? Could you get a reading from whoever took that reading? |
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| Author: | argentina-slantsixer [ Thu Apr 21, 2005 1:40 pm ] |
| Post subject: | |
Aha! Thanks guys, I almost go nuts on this History goes like that. I got a new cam when I put together my fresh mill, and grinder said to set .08 ex and intake. While I was breaking in the new motor, I loose taht lash like .10 on intake and .18 on ex. This was when I got my first 160 psi (give or take) reading. I wasn't happy with my grinder's specs about lash so I experimented everything, from zero lash to .20 .20 lash. I don't know wich pattern he used, but this cam likes very much low lash settings. Currently I'm .05 .08 and it works great but I suppose I have that to blame on my huge comp drop. I haven't got 2 even #'s on my cyls so I guess that I'm to due my apparent compression drop to that tight lash. I'm gonna loose those valvles and see if i see some PSI raise. thanks. Juan |
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