Compression test results, anyone help me? have a really quick question
#1
Compression test results, anyone help me? have a really quick question
first:
1990 miata 1.6L
runs and drives fines, gets 28-33 mpg
adjustable cam gears and a few racing beat things under the hood
full adjustable suspension, springs
behind the seat metal panel on the corners are bent and you can get to the trunk like below where the top it, the carpet covers it but it sags down... i wasnt sure if a rollcage was once on there or what, havent looked into it yet. but i was wondering how usual rollcages are mounted on miatas
just doesnt have power, feels like it should have a good bit more.. never drove a car with this little power before lol
all cylinders are at 105-115 psi just removing spark plugs
and i tried the first two cylinders on a wet test and it was 148ish on both, pretty much on the 150 line
whats going on? piston rings shot ild assume, but anything else
1990 miata 1.6L
runs and drives fines, gets 28-33 mpg
adjustable cam gears and a few racing beat things under the hood
full adjustable suspension, springs
behind the seat metal panel on the corners are bent and you can get to the trunk like below where the top it, the carpet covers it but it sags down... i wasnt sure if a rollcage was once on there or what, havent looked into it yet. but i was wondering how usual rollcages are mounted on miatas
just doesnt have power, feels like it should have a good bit more.. never drove a car with this little power before lol
all cylinders are at 105-115 psi just removing spark plugs
and i tried the first two cylinders on a wet test and it was 148ish on both, pretty much on the 150 line
whats going on? piston rings shot ild assume, but anything else
#9
test in all the way, brand new, oring is fine on tester
120psi on all cylinders and number 3 is at 105 or so
drove it around and temp gauge was in middle, and the tester was hot as hell after i screwed it out
the 105 cylinder when i put a little oil did jump up a past 120
and the 120 cylinders did jump up past 140 or so with a little oil
i dont have a leak tester to see if the air would come through the pcv valve/breather but timing will be next checked, whats easiest way to adjust timing on the miata?
120psi on all cylinders and number 3 is at 105 or so
drove it around and temp gauge was in middle, and the tester was hot as hell after i screwed it out
the 105 cylinder when i put a little oil did jump up a past 120
and the 120 cylinders did jump up past 140 or so with a little oil
i dont have a leak tester to see if the air would come through the pcv valve/breather but timing will be next checked, whats easiest way to adjust timing on the miata?
Last edited by josh90miata; 07-05-2011 at 02:42 PM.
#12
No idea man... odometer reads 211,000
but i found some paper work on the car today
bought at 144,000
1st rebuild at 146k
2nd rebuild at 146,935
5/28/97 front crankshaft seal/camshaft seal, timing belt, 115,527 miles
7/15/01 rings, oil pump, starter, rebuild - 145,975 miles
2/09/03 crank and bearings, water pump 146,935 miles
7/15/01 oil/filter 146k
2/09/03 oil/filter 146,935
5/29/03 oil filter 148,182
2/07/04 oil/filter 150, 282 1.5 qt low
have all original papers from roswell mazda in roswell, ga and this nice mazda book
has full suspension and handles amazingly, idk what the car was used for.. but a/c and power steering, and all accessories work, speakers in the headset too lol
but its a nice car and runs and drives fine, just doesnt have the power.. thats why i thought about compression and seems i was right... doesnt burn any oil at all though
but i found some paper work on the car today
bought at 144,000
1st rebuild at 146k
2nd rebuild at 146,935
5/28/97 front crankshaft seal/camshaft seal, timing belt, 115,527 miles
7/15/01 rings, oil pump, starter, rebuild - 145,975 miles
2/09/03 crank and bearings, water pump 146,935 miles
7/15/01 oil/filter 146k
2/09/03 oil/filter 146,935
5/29/03 oil filter 148,182
2/07/04 oil/filter 150, 282 1.5 qt low
have all original papers from roswell mazda in roswell, ga and this nice mazda book
has full suspension and handles amazingly, idk what the car was used for.. but a/c and power steering, and all accessories work, speakers in the headset too lol
but its a nice car and runs and drives fine, just doesnt have the power.. thats why i thought about compression and seems i was right... doesnt burn any oil at all though
#16
Boost Czar
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engine should be warm.
make sure you are unplugging the CAS and running WOT so the injectors dont fire and you are ingesting all the air possible.
Crank until the gauge stops going up.
if you do a wet test, put the same amount of oil in each; you need very little like (1) teaspoon.
make sure you are unplugging the CAS and running WOT so the injectors dont fire and you are ingesting all the air possible.
Crank until the gauge stops going up.
if you do a wet test, put the same amount of oil in each; you need very little like (1) teaspoon.
#18
whatever became of this? I have a 1.8l 96 and also have 120, 105, 120, 120, this is warm, crank and WOT.
Putting oil in #2 brings it up to 120. I did not oil the others nor have I tried a second gauge. I can do that now.
Intake and Exhaust cams are 19 belt nipples apart (as it shows in the pictures on other links around here).
Could I have burnt all of the exhaust valves evenly? Hard to believe!
Yes, all kinds of sea foam and other products...no help. Car runs great but is amazingly slow. It did Dyno at 104rwhp before the turbo. 200hp with the turbo. Right now, no turbo.
Paul
Putting oil in #2 brings it up to 120. I did not oil the others nor have I tried a second gauge. I can do that now.
Intake and Exhaust cams are 19 belt nipples apart (as it shows in the pictures on other links around here).
Could I have burnt all of the exhaust valves evenly? Hard to believe!
Yes, all kinds of sea foam and other products...no help. Car runs great but is amazingly slow. It did Dyno at 104rwhp before the turbo. 200hp with the turbo. Right now, no turbo.
Paul