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Thread: MS3/DISI - Low Compression Discussion

  1. #26
    Moderator loki's Avatar
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    Default Re: MS3/DISI - Low Compression Discussion

    Quote Originally Posted by breakfasteatre View Post
    I would have never known there was anything wrong my motor if i hadnt of done a compression check "for fun"

    Its crazy, when i pulled the piston out, there was a 4" long piece cracked off of the side, sitting in the cylinder bore. There was zero damage to the cylinder wall, not even one scratch, it was amazing.
    bout time you had some good luck

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    Jr Member Prezi's Avatar
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    Default Re: MS3/DISI - Low Compression Discussion

    I guess i'll give a quick experience with low compression.

    January 2014, I found a 2007 MS3 at Achilles Mazda for a good price (with warranty still on it). Went to test drive it with my uncle, feel in love with the car. My uncle drove it, did whatever tests he had to do while driving (he's a retired mechanic) and said it was alright. Bought the car.

    My first mistake was NOT requesting a compression test, nor reading up more on what to look for when purchasing the vehicle. It wasn't until after the car was in my possession I started reading up more on the issues with the engine on here and mazdaspeedforums.com… also bugging/texting the hell out of a fellow TM3 member to ask questions and learn more lol.

    Since i've had the car, i've had my turbo replaced, vvt replaced, MAF sensor replaced, trailer arm bushings replaced, and a few other parts. Even after all that, I never felt my car was performing 100%.

    Fast forward a couple month (not to bore you guys), and after 2 not so great compression tests.. .I purchased my own compression kit, and me a phil did a third test on my engine. .. the numbers from right to left were 180 - 160 - 130- 150. Not great at all.

    Took my car to the dealership, and explained to the service manager (very nice guy!) the issues I was experiencing with my car. He said leave it with him for a few days, while they have a look. After a couple of days, I got a phone call saying that my piston rings were worn, and that i needed a new engine. Luckily for me I still have extended warranty on the car, and mazda ended up replacing my whole engine.

    For anyone looking to purchase this car, please learn from my mistakes… read up, ask questions, read more, ask more questions and do a compression test before purchasing a MS3. It will save you a lot of headache.
    Last edited by Prezi; 05-29-2014 at 08:03 PM.
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    Moderator loki's Avatar
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    Default Re: MS3/DISI - Low Compression Discussion

    You had a good outcome

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    Default Re: MS3/DISI - Low Compression Discussion

    I was driving down the road and the engine died.. i visually checked my compression and it was 0-190-190-190.
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    Default Re: MS3/DISI - Low Compression Discussion

    No way...you blew up?

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    Default MS3/DISI - Low Compression Discussion

    Haha that was 2 years ago, when I blew the stock motor.

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    Default Re: MS3/DISI - Low Compression Discussion

    Quote Originally Posted by Snotrocket View Post
    Haha that was 2 years ago, when I blew the stock motor.
    LoL didn't read back, thought it was a rando thread bump because you blew

  9. #33
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    Default Re: MS3/DISI - Low Compression Discussion

    Quote Originally Posted by SomeGuy View Post
    LoL didn't read back, thought it was a rando thread bump because you blew
    Haha no just a random thread bump cuz I'm bored at work.

  10. #34
    Jr Member ricola's Avatar
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    Default Re: MS3/DISI - Low Compression Discussion

    Picked up an 07 speed. Had the compression tested today and it came out 175-175-175-175. Weird. Seems too good to be true

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    Default Re: MS3/DISI - Low Compression Discussion

    Likely kept stock.

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    Default Re: MS3/DISI - Low Compression Discussion

    Quote Originally Posted by ricola View Post
    Picked up an 07 speed. Had the compression tested today and it came out 175-175-175-175. Weird. Seems too good to be true
    Why would a speed3 that has good compression be weird?

    Is the expectation that all speed3 motors are just f****ed?

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    Default Re: MS3/DISI - Low Compression Discussion

    Quote Originally Posted by loki View Post
    Why would a speed3 that has good compression be weird?

    Is the expectation that all speed3 motors are just f****ed?
    Sweet. Good answer!

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    Sr Member Flagrum_3's Avatar
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    Default Re: MS3/DISI - Low Compression Discussion

    Quote Originally Posted by loki View Post
    Why would a speed3 that has good compression be weird?

    Is the expectation that all speed3 motors are just f****ed?
    Maybe he meant it was weird the readings came out identical for all cylinders?...which is not seen very often, usually there would be slight differences from cylinder to cylinder.

    _3

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    Default Re: MS3/DISI - Low Compression Discussion

    Quote Originally Posted by Flagrum_3 View Post
    Maybe he meant it was weird the readings came out identical for all cylinders?...which is not seen very often, usually there would be slight differences from cylinder to cylinder.

    _3
    That's pretty much what I was getting at. I didn't expect those numbers from a 100k engine.

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    Default Re: MS3/DISI - Low Compression Discussion

    a year ago my #s were #1 180 #2 180 #3 183 #4 191...this is before Downpipe and targeting 18psi.

    Did a test last weekend and got #1 170 #2 172 #3 171 #4 176 (with DP and targeting 20 psi). Not sure if the drop in compression is anything to be concerned about since its pretty even across all cylinders. Engine has 91K on it.

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