scooby_doo_do Posted May 23, 2003 Share Posted May 23, 2003 I was just wondering what readings i should be looking for if i had a compression check from my car ? Whats a good engine reading normally for a supra? and a messed engine ? Thanks.. Craig, Quote Link to comment Share on other sites More sharing options...
mos Posted May 23, 2003 Share Posted May 23, 2003 185 psi or more for an N/A 156 minimum for N/A No difference greater than 14 psi between cylinders 156 psi or more fo TT 128 minimum for TT No difference greater than 14 psi between cylinders Each engine will be different but as long as you are in spec then its O.K. Quote Link to comment Share on other sites More sharing options...
scooby_doo_do Posted May 23, 2003 Author Share Posted May 23, 2003 ok, i find out what mine is tommorrow.... I think i was told roughly 150 in all cylinders except for 6 which was a slightly lower reading but this has no been fixed as far as i'm aware.. Craig. Quote Link to comment Share on other sites More sharing options...
mos Posted May 23, 2003 Share Posted May 23, 2003 If it hasnt been fixed and 6 is still lower then get a leakdown test carried out Quote Link to comment Share on other sites More sharing options...
scooby_doo_do Posted May 23, 2003 Author Share Posted May 23, 2003 i think they said something along the lines of i had a split on one of my pipes and it was leaking water...... but after a new pipe and clean up its all sorted.... Don't take this as being the right explanation as i was on the mobile at the time and couldn't hear all that well ! i'll find out all the details tommorrow... C. Quote Link to comment Share on other sites More sharing options...
scooby_doo_do Posted May 23, 2003 Author Share Posted May 23, 2003 Sorry, i'm not very technical, but whats a leakdown test.... And thanks for all the answers.. Craig, Quote Link to comment Share on other sites More sharing options...
mos Posted May 23, 2003 Share Posted May 23, 2003 Really cant understand the water one. When the cylinder moves upwards all the vv,s are shut, the cylinder continues upwards and compreses the air fuel mix, this is what is tested on a compression test, the only ways to get a low reading are poor valve seating, blown headgasket, worn piston rings. A leakdown test is when air is pumped into the cylinder, and gives an insight into where the low compression is coming from as the air will obviously go where the gap is. Quote Link to comment Share on other sites More sharing options...
dude Posted May 23, 2003 Share Posted May 23, 2003 Bad compression is normally due to either a badly seating valve or worn piston rings , if youve got low readings try doing a wet test (using oil) if the reading goes up this would point to rings . John:flame Dev Quote Link to comment Share on other sites More sharing options...
Jake Posted May 23, 2003 Share Posted May 23, 2003 Originally posted by mos When the cylinder moves upwards all the vv,s are shut, the cylinder continues upwards and compreses the air fuel mix Cylinders move do they ? Quote Link to comment Share on other sites More sharing options...
Terminator Posted May 23, 2003 Share Posted May 23, 2003 Originally posted by dunk657 Cylinders move do they ? Now that depends upon who's driving:devil: Quote Link to comment Share on other sites More sharing options...
dude Posted May 23, 2003 Share Posted May 23, 2003 Originally posted by dunk657 Cylinders move do they ? Dont be silly we all know that they move downwards:p John:flame Dev Quote Link to comment Share on other sites More sharing options...
mos Posted May 23, 2003 Share Posted May 23, 2003 Long long day thank you for pointing out the errors of my ways when trying to help Quote Link to comment Share on other sites More sharing options...
dude Posted May 23, 2003 Share Posted May 23, 2003 John:flame Dev Quote Link to comment Share on other sites More sharing options...
MONKEYmark Posted May 23, 2003 Share Posted May 23, 2003 just lent my dads compression meter to do mine. never done owt like that before but will give it a go found a website with cheap compression testers if anyone wants it they start from £12 +vat you would pay more than that for someone to do it for you. this seems a good site for tools http://www.justoffbase-tools.co.uk/vehicle_service_tools/CT953.html Quote Link to comment Share on other sites More sharing options...
mos Posted May 23, 2003 Share Posted May 23, 2003 Disconnect the injector plug on the cylinder that you are testing and you will be fine Quote Link to comment Share on other sites More sharing options...
dude Posted May 23, 2003 Share Posted May 23, 2003 Or just disconnect the ignitor box , and dont forget throttle open . John:flame Dev Quote Link to comment Share on other sites More sharing options...
MONKEYmark Posted May 23, 2003 Share Posted May 23, 2003 dont you just pull the efi fuse? will have another look. at the search function, eyfi put info up about it Quote Link to comment Share on other sites More sharing options...
eyefi Posted May 23, 2003 Share Posted May 23, 2003 u'd b better with no fuel going in at all. take out efi 1 & 2 fuses. this way u wont get any fuel washing the cylinders. Quote Link to comment Share on other sites More sharing options...
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