DISI Compression Results

[Blackrider]

I just did mine at 88,000KM and there is less than a 5 PSI difference between cylinders. I did it coldish, so my numbers were a bit lower but I was more concerned about the variance.

[superskaterxes]

just did mine again at ~60k miles and i had 170's across the board.

20k of which were BT

[Dano]

damn...do I have to re-do mine again?

[Sneak]

Just did mine today (warm).

2008 MS3
108,000 mi (stock for first 60k, then stage 2)

(Passenger)
180
185
187
187

750 ASL - 75*, sunny.

Really surprised.

[BlueStreak]

Did a compression test on a fellow Gen 1 Speed owner in Toronto.

170
185
185
185

The car has 56,000KMs on it with the majority of it being highway. Odd that cylinder 1 is showing signs of wear so quickly.

[thomas_cory2000]

Just did a compression test last week, all cylinders are sitting at about 175! lol

[dkapetansky]

Just did a compression test last week, all cylinders are sitting at about 190! lol (This '07 MS3 has 30k miles on it.)

[thomas_cory2000]

Originally Posted by Johnny Carruthers Just did mine today (warm). 2008 MS3 108,000 mi (stock for first 60k, then stage 2) (Passenger) 180 185 187 187 750 ASL - 75*, sunny. Really surprised.

SERIOUS QUESTION,

I have an 07 MS3 74k miles on it, cars in mint cond, but was giving some very serious consideration on trading it in or seeling it for anther 1 with lower miles, since ur well over 100k have u noticed anything start 2 fall apart &/or what al have u replaced that has worn out since new?????

Originally Posted by dkapetansky Just did a compression test last week, all cylinders are sitting at about 190! lol (This '07 MS3 has 30k miles on it.)

Arent u getting rid of your car lol

[frivolous_rob]

Originally Posted by Johnny Carruthers Just did mine today (warm). 2008 MS3 108,000 mi (stock for first 60k, then stage 2) (Passenger) 180 185 187 187 750 ASL - 75*, sunny. Really surprised.

You give me hope good sir!
Mine was stock till 60k and then I went to town. Now big turbo at 71k and car is loving every bit of it. Glad your numbers are good =]

[Sneak]

@thomas_cory2000 - I know this isn't the thread for this...I was also considering dumping mine because of miles. It's my DD so I haven't really beat the hell out of it, but it's fun to surprise the dick driving the S4 every now and then. (I keep it as stock looking as possible). I just bought a used 3076 turbo and am putting it on in the next few weeks. I'm seeing mostly salt corrosion on bolts and stuff. This doesn't include mods or related repairs.

44k - tensioner pulley
45k - rear shocks
60k - Mazda replaced the wiring harness (driver air bag light came on for the 4th time)
80k - brakes
93k - replaced driver CV boot 2x in a week, caused me to replace FSB endlinks (shitty mechanic the first time, I did it myself the 2nd)
109k - timing chain's really loose and I'm waiting for the parts to come in (DCR VVT actuator, timing chain, tensioner, etc).

Not too bad though.

Originally Posted by letsfightrobbb You give me hope good sir! Mine was stock till 60k and then I went to town. Now big turbo at 71k and car is loving every bit of it. Glad your numbers are good =]

Thanks man - I figured I should do it after some trolling. I'm definitely not the most experienced here, so I research a lot before posting. I've gotta ditch my K04 before I hit 110k...too bad my wife doesn't know enough to give me shit over it.

[frivolous_rob]

^ youll love driving with big turbo. no more boosting around town uncontrollably. Car feels way more solid.

[thomas_cory2000]

Originally Posted by Johnny Carruthers @thomas_cory2000 - I know this isn't the thread for this...I was also considering dumping mine because of miles. It's my DD so I haven't really beat the hell out of it, but it's fun to surprise the dick driving the S4 every now and then. (I keep it as stock looking as possible). I just bought a used 3076 turbo and am putting it on in the next few weeks. I'm seeing mostly salt corrosion on bolts and stuff. This doesn't include mods or related repairs. 44k - tensioner pulley 45k - rear shocks 60k - Mazda replaced the wiring harness (driver air bag light came on for the 4th time) 80k - brakes 93k - replaced driver CV boot 2x in a week, caused me to replace FSB endlinks (shitty mechanic the first time, I did it myself the 2nd) 109k - timing chain's really loose and I'm waiting for the parts to come in (DCR VVT actuator, timing chain, tensioner, etc). Not too bad though. Thanks man - I figured I should do it after some trolling. I'm definitely not the most experienced here, so I research a lot before posting. I've gotta ditch my K04 before I hit 110k...too bad my wife doesn't know enough to give me shit over it.

Ive replaced my brakes and pads all the way around and the tires, I alo have to go to the dealer friday to get (DCR VVT actuator, timing chain, tensioner, etc). <--- replaced as well $850-900

[Sneak]

Originally Posted by thomas_cory2000 Ive replaced my brakes and pads all the way around and the tires, I alo have to go to the dealer friday to get (DCR VVT actuator, timing chain, tensioner, etc). <--- replaced as well $850-900

That's why I'm doing it myself. Just need the timing tools. Total upgraded parts will be $450 and a day or 2 labor. And I'll get to know my car a little better. If I fail, then I'll take it to Mazda.

[BlueStreak]

Now that I know why my engine went sour, here's the info.

190
185
150-160 (due to a cracked ringland)
180

Car has around 85,000KMs and has been raced in autocross and time attack over the last 3 years.

[Dano]

Damn that sucks. Time for a build? Or get a 2012 Focus ST. Lol


Tappin

[BlueStreak]

Originally Posted by Dano Damn that sucks. Time for a build? Or get a 2012 Focus ST. Lol Tappin

Time To Go Forged

[frivolous_rob]

150,150,150,151. 07 ms3 72k miles. 3076r for 1k miles. 4000ft elevation. At least its consistent

[Tomas]

2009 MS3
40K miles - spraying meth for about 20K
Ambient Temp about 68 deg.
Sealevel

185
185
185
190

Hey Lex,
What do you say about the marks on the piston crowns. Are those from the Injectors spraying? I am assuming this is normal for DI engines. Looks a little as if there was brass on the crowns. The blots are sort of golden looking. Spark Plugs look perfect.

Boroscope pics:

[theurgy]

Just ran a compression test this weekend as I was changing out my sparkplugs for Denso ITV-22's.

181
181
179
180

Looks all good to me!

[Dano]

Originally Posted by Dano did this a few weeks ago when I thought I heard a knock at idle but it turned out to be nothing. Cold motor-none of the suggestions used like cluth and accl pedal depressed. Just cranked her over with injector fuze pulled until PSI hit max...took about 4 compression strokes. 28K miles 1=175 2=174 3=175 4=175 Edit: 400 ASL

updated numbers at 50K. Car was very warm to hot for this test so I guess that's why I got some 180's

1=180
2=175
3=180
4=178

[xtasy]

Car bought stock @ 23,400 miles, All basic bolt on except downpipe till 36k miles.

30k-36k miles tuned @ 20 psi

Passenger side to driver side ->
1.) 184
2.) 182
3.) 182
4.) 182

test done twice.. same result.

[Tokay444]

Nice!

[Lex]

Originally Posted by Tomas 2009 MS3 40K miles - spraying meth for about 20K Ambient Temp about 68 deg. Sealevel 185 185 185 190 Hey Lex, What do you say about the marks on the piston crowns. Are those from the Injectors spraying? I am assuming this is normal for DI engines. Looks a little as if there was brass on the crowns. The blots are sort of golden looking. Spark Plugs look perfect. Boroscope pics:

I'm so late to this party but the spray pattern from teh injector just cleans the carbon from the crowns so you're seeing that triangular shape - in the first pic especially. Any shiny stuff is generally not so hot - it can be pitting from detonation or just an unclear image. The crowns are very clean however.

[Evan@COBB]

Looks like most everyone has been having some really nice readings. Unfortuneately, that trend does not apply to me.

Test 1 @ 30,000 miles:

Cylinder 1 - 160
Cylinder 2 - 167
Cylinder 3 - 187
Cylinder 4 - 200

Test 2 @ 33,000 miles

Cylinder 1 - 159 w/ 21% leakage
Cylinder 2 - 162 w/ 28% leakage
Cylinder 3 - 175 w/ 13% leakage
Cylinder 4 - 191 w/ 3% leakage

Air is coming through dipstick.

Been trying to figure out which direction I'd like to go with a rebuild.

[Tokay444]

Originally Posted by Evan@COBB Looks like most everyone has been having some really nice readings. Unfortuneately, that trend does not apply to me. Test 1 @ 30,000 miles: Cylinder 1 - 160 Cylinder 2 - 167 Cylinder 3 - 187 Cylinder 4 - 200 Test 2 @ 33,000 miles Cylinder 1 - 159 w/ 21% leakage Cylinder 2 - 162 w/ 28% leakage Cylinder 3 - 175 w/ 13% leakage Cylinder 4 - 191 w/ 3% leakage Air is coming through dipstick. Been trying to figure out which direction I'd like to go with a rebuild.

Look into mazda's new high pressure valve flush.

[djuosnteisn]

Originally Posted by Tokay444 Look into mazda's new high pressure valve flush.

Is this some cleaning technique?

[Evan@COBB]

Originally Posted by Tokay444 Look into mazda's new high pressure valve flush.

Yeah, I've never heard of this.

However, I cleaned my intake valves last weekend (for the second time)

[Tokay444]

It is.
It's crazy how well it works.
I've seen it cure a 20% leak down and restore factory compression accross the board.

It's proprietary for the disi I believe.

[Lex]

Originally Posted by Tokay444 It is. It's crazy how well it works. I've seen it cure a 20% leak down and restore factory compression accross the board. It's proprietary for the disi I believe.

If he's leaking through into the crankcase - ie it's leaking past the rings, flushing the valves won't help with anything.

Originally Posted by Evan@COBB Yeah, I've never heard of this. However, I cleaned my intake valves last weekend (for the second time)

@Evan@COBB
Evan, what are your vacuum readings at warm idle with A/C turned off?

[Tokay444]

I know what you're saying, but it cleans the combustion chambers as well and removes deposits from the ring lands which can cause blow by.

[Lex]

Originally Posted by Tokay444 I know what you're saying, but it cleans the combustion chambers as well and removes deposits from the ring lands which can cause blow by.

Aight ... does any dealer do this? Just phone in and book it?

[Tokay444]

The system is knew, so not ALL dealers have it, and the tech go away for special training on it.
It's about $300 and was developed just for the problem us disi guys have with buildup on the valves.

The chemicals are extremely harsh and an oil change is done immediately post service.
They'll scope the valves prior and post for an extra fee.

[Lex]

Originally Posted by Tokay444 The system is knew, so not ALL dealers have it, and the tech go away for special training on it. It's about $300 and was developed just for the problem us disi guys have with buildup on the valves. The chemicals are extremely harsh and an oil change is done immediately post service. They'll scope the valves prior and post for an extra fee.

You've got some concrete evidence of this? Know someone who's done it first hand? Certainly beats removing the intake manifold and scrubbing.

[Tokay444]

Yes. He's on the forum. Kris"cwp" something or other.

He was/having extreme fuel dilution issues (+10% after 1500kms) that Mazda is turning a blind eye to.
He had bad leak down over 20%. Brought it back to less than 2%, and resorted his compression to perfect spec.
He is still having fuel dilution issues however. Brand new genpu.

[theurgy]

Interesting.
Lex, I'll inquire with some of our local dealers here.

[Evan@COBB]

@Lex

Vacuum shows -10 on the AP.

[djuosnteisn]

Originally Posted by Lex If he's leaking through into the crankcase - ie it's leaking past the rings, flushing the valves won't help with anything.

Could also be a leaky PCV i suppose...



The valve cleaning service sounds awesome.

[theurgy]

I'm guessing with the new SkyActiv engines being introduced to the broader scale of vehicles and not just limited to the Mazdaspeeds, dealing with the pitfalls of direct injection is going to be a concern for Mazda.

[Evan@COBB]

Originally Posted by djuosnteisn Could also be a leaky PCV i suppose... The valve cleaning service sounds awesome.

Haven't performed a compression/leakage test since I've installed a new PCV and installed the OCC.

At the same time as I did those installs, I installed a reworked K04 from Forced Performance.

I then had a smoking turbo which I cured with a bnoon bolt.

Now, it seems, that if I get into high boost, as soon as I let off, I get a cloud of white smoke that puffs out.

It's never ending..

Oh yeah, I'm still getting oil coming through the valve cover vent and into the SF intake.

FML.

[djuosnteisn]

Originally Posted by Evan@COBB Haven't performed a compression/leakage test since I've installed a new PCV and installed the OCC. At the same time as I did those installs, I installed a reworked K04 from Forced Performance. I then had a smoking turbo which I cured with a bnoon bolt. Now, it seems, that if I get into high boost, as soon as I let off, I get a cloud of white smoke that puffs out. It's never ending.. Oh yeah, I'm still getting oil coming through the valve cover vent and into the SF intake. FML.

Hahahahaha. And you have check valves with the OCC? Seems unlikely the that's the cause of low compression then.