Jump to content
SAU Community

Recommended Posts

hey guys my car has been in the garage since the start of october and its set to get new turbos due to the blown ones, however i want to check the compression b4 towing it off to the workshop and finding out that i need a rebuild. i havnt bought the turbos yet incase i need a rebuild, because if i do i will probaly sell the car as is :)

i dont know what other tools you need for compression tests but ive got socket set already so if anyone can come and do a test for me id more then appreciate it! i can offer a case of beer if anyones interested! since thats the usual form of currency around here for help lol :)

im in the western suburbs of sydney (blacktown area)

Link to comment
https://www.sau.com.au/forums/topic/145806-compression-test/
Share on other sites

i have comp thingy but car sould be warm i think to test. I live just down the road if you need a hand let me know when, i do shift work so maybe be hard finding a day when we are both off.

working arvos all week and off next monday and tuesday

wel i started the car for the first time since i knew it was blown (october) and it idles fine with no unordinary noises.. i let it idle till it was upto operating temps.. im assuming my engine is fine by the looks of how its going! but yeah just to make sure

blk180: cool would it be ok for a monday or tuesday next week? anytime monday but tuesday would have to be before about 2pm.

In this case you don't need accurate reading, you can do a cold test , you will see if all the cylinders are the same. First do a cold test, if they are all the same , start the engine warm it up and do a proper test . Leakdown test would be good too.

did a cold start today with the help of blk180 (thanks mate)

1- 135

2- 130

3- 115

4- 135

5- 130

6- 135

those were the results, couldnt do cylinder 3 again cuz my battery died lol

Number 3 looks a bit sus, was it the last one to test ? If yes the battery could have been low and cranking it slower than the others . If it was done in order number 3 is not as healthy as the others. Leakdown test will be more comprehensive . Did the front turbo let go? Did you do a comp test ever before this happened?

yeah number 3 worries me as well. the cylinders were done in order. unfortunantly i never got around to doing a compression test ever lol this was the first time.

not sure which turbo, let go ill be bringing it to hills motorsport once my turbos arrive. ill get a leakdown test while its there as well.

but yeah i havnt turned on the car since october

yeah number 3 worries me as well. the cylinders were done in order. unfortunantly i never got around to doing a compression test ever lol this was the first time.

not sure which turbo, let go ill be bringing it to hills motorsport once my turbos arrive. ill get a leakdown test while its there as well.

but yeah i havnt turned on the car since october

So you don't really know that a turbo/turbos let go, right ? If you have a cat undo the the cat where it joins the front pipes and check in there . Have you checked the wastegates to make sure they dont stay open?

im gna go and check my cat right now.

not to sure how to check the wastegates though

edit: dammit i dont have my jack. im pretty sure the turbo let go though as i heard the peices in my cat when it was idling before

The rods should be all the way to the front when the gats are shut . If you have a compressor undo the hose and pump 10 psi or so the rods should move to the rear thn the gates open . If you can blow 10-12 psi you can do that too but you must have strong lungs .. Look in the cat first and if you dont find anything there then look at the gates ... One of the gates open you won't have any boost, any leaks in the system ( blown cooler or pipe ) you wont have vacium ( or maybe very little vacium ).

What kind of turbos are you buying?

im jus getting the slide hi flow turbos.

not to sure how to check that so i better not do it incase i break it even more lol. but ill check the cat asap.

ive just changed my cooler pipes to a hardpipe kit so that cancels it out and cooler is all good.

Before you condem the enigne i would be getting a cylinder leakage test for all you know it could be a valve not seatings find out where the compression is leaking from before you give the engine a full rebuild.. As a mechanic i seen lots of people pay for a full rebuild when its been a valve not seating.. get the cars properly check before condeming the whole engine.. my lil 2 cents add ;) just a thought... but still if u wanna check if it is the compression rings doa wet test as it is called in the industry, this will tell you if it is the rings not sealing..

  • 2 months later...

hey guys just an update, got my car back today!!!

i got my new slide hi flow turbos installed along with xforce dumps & got my hks evc III @ 1bar.

engine was A-OK the rear turbo blew and went into my cat :ninja::)

ill be getting it dyno'd on saturday & will be attending the sau vs. v8 drag day on the 25th, so ill post up the results soon :(

THANKS AGAIN TO THE GREAT WORK FROM THE GUYS AT NBP (Northern Beaches Performance)!!! and of course all the help from SAU'ers!

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Oh bugger ! Your right ! Good old hydrogen sulfide. Takes me back to the good old school days ! 
    • I've owned a few scooters over the years, a Vespa PX oil burner was my first scooter, followed by a few others, including a little 50cc BeeWee that I used as a barracks bike, and I've had a blast on all of them, they really are the cheapest for of city/suburb transport around The only issue with scooters in Australia is lots of people look down on them due to their size,  maybe they need a big bike to make up for something else where they are lacking, unlike Europe and Asia where every man an their dog owns one, and now that filtering is legal in NSW, local traffic is never a issue Not to say I haven't owned my share of big cc bikes over the years, but they were for more blasting through the hills or Hwy riding where it needed to sit on Hwy speeds Safety wise, I ride like everyone is always trying to kill me, everyone is running a red, or running stop/give way signs, or generally asleep at the wheel, which most people are duringtheir commute, I also ride really safe, and give myself, and everyone else enough room in case I need to pull some hasty evasive actions, I've done a few rider training days over the years, which has come in handy on more than a few occasions  As for mods, there's nothing really, and yes your right about aftermarket exhaust, all you get is loud and obnoxious noises from them, like every 250-300 cc you hear with a aftermarket muffler, in saying this I did put a rear muffler from a 125 Aprilla on one of my old 125 scooters, it was horrendous and no amount of full face helmet and ear plugs would dampen that noise As for coming from the Harley, and what a overpriced POS that was, I no longer do big rides as my poor old busted joints ache after about 1/2 an hour of riding, long cruises are so much more enjoyable now in a car, so a big bike would be pointless   
    • Oh wow, it's easy to forget how cheap these can be. Probably the cheapest way to travel. Though people in cars here tend to be morons and I would not feel very safe. Were scooters ever big in Australia? It used to be the thing growing up in Europe ~20 years ago. 50/70/125ccm Peugeot or Yamaha and some others. Utterly obnoxious Polini race exhausts. Kick stands that slant as much as possible. So loud. So much noise for really not moving very fast at all. But it felt cool at the time. Not sure where I'm going with this, but there is an aftermarket for mopeds! Though I'd have pictured you more for a Goldwing kind of guy after growing out of the Harley.
    • You need to know I am sorry for this.  
    • As the MX5 isn't apparently "manly" enough, and I need something for runs to the local shops, and also take to my part time job at the salon, basically I can keep the MX5 away from car parks and stuff......like "flying lockers", I was wondering what I could buy to fix this issue LOL, I pick up a new Yamaha 125 Delight this arvo from Trooper Lu, basically a R1 that you can fit a slab of beer on between your feet, also, it was $29400 cheaper than a R1, so actually it's 2 x better than a R1    
×
×
  • Create New...