DISI Compression Results

[Mandinca]

At least they are consistent. If they were all 170 except one at 135 if be worried. Looks like a bad tester.

[maisonvi]

Originally Posted by Mandinca At least they are consistent. If they were all 170 except one at 135 if be worried. Looks like a bad tester.

My thoughts exactly.

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[Lex]

190-190-180-190.

With more cranking 200-200-190-200.

Pretty much the same as they've been for the last 30k miles.

55k miles on the motor.

[Tokay444]

My build starts this winter. Striving to come out of the gate in the spring.
It's gonna be tough though.

[Lex]

I'm quite impressed and how the motor has held together. Original VVT, clutch, block. Modified and heavily tested on since before it had 10,000km. Always pushing it a little more each time. When/if it lets go, it's certainly done its job.

[ms3blackmica]

I hear you on that one, Lex.

76,000 miles here. 205-210 psi in every cylinder. No oil consumption and no blow-by issues.

Original clutch, VVT (no noises), everything.

Must be a GenWon thing

[MPS_Fan]

@Lex, be proud to have such a good engine. Mine took a shit at only 19k miles... That makes me sick!

[Lex]

Originally Posted by ms3blackmica I hear you on that one, Lex. 76,000 miles here. 205-210 psi in every cylinder. No oil consumption and no blow-by issues. Original clutch, VVT (no noises), everything. Must be a GenWon thing

Never had blowby or oil consumption issues either. I am religious on the maintenance and modify/tune smartly as I am sure you do as well but some do seem to be built on Wednesday.

Originally Posted by MPS_Fan @Lex, be proud to have such a good engine. Mine took a shit at only 19k miles... That makes me sick!

That is an early and I must say an unusual failure.

[ms3blackmica]

Originally Posted by Lex Never had blowby or oil consumption issues either. I am religious on the maintenance and modify/tune smartly as I am sure you do as well but some do seem to be built on Wednesday.

I too am religious on the maintenance and I strongly believe that is the reason it is in the excellent condition that it is today even 4 years later.

Since day one I have done a carbon cleaning treatment with Seafoam almost every 3,000-5,000 miles and religiously clean parts that accumulate dirt, carbon, etc...

I am always taking a peak inside the cylinder and the pistons are and have always remained very very clean.

I think maintenance is 100% key to longevity and an all around healthy engine.

It can be a bit of extra work but its a nice way to spend a Sunday for an hour or two with some music

[himurax13]

Originally Posted by ms3blackmica I hear you on that one, Lex. 76,000 miles here. 205-210 psi in every cylinder. No oil consumption and no blow-by issues. Original clutch, VVT (no noises), everything. Must be a GenWon thing

This is unusually rare in my part of the world.

[2012FailWheelDrive]

I have 47k with 8k of them with my 3071 @26 psi running a 3/9 mix of e85/93. Have been getting a TON of oil from my valve cover to my TIP. Added oil catch can according to jbr instructions with check valve and it helped a little but the problem still persists.

Here are my results.
Dry test: 1) 150 2) 150 3) 170 4)150
Wet test: 1) 200 2) 200 3) 215 4) 200

[timjs]

Originally Posted by 2012FailWheelDrive I have 47k with 8k of them with my 3071 @26 psi running a 3/9 mix of e85/93. Have been getting a TON of oil from my valve cover to my TIP. Added oil catch can according to jbr instructions with check valve and it helped a little but the problem still persists. Here are my results. Dry test: 1) 150 2) 150 3) 170 4)150 Wet test: 1) 200 2) 200 3) 215 4) 200

Good bye rings.
Inb4 @Tokay444; "yea but what's your leakdown?"

[2012FailWheelDrive]

Originally Posted by timjs Good bye rings. Inb4 @Tokay444; "yea but what's your leakdown?"

Haha yea I figured

[561BlackMS3]

81000 miles, I'm at sea level(Florida), the car is completely stock.
All cynlinders would jump to 210( +/- 2) then taper down to 180(+\- 2)and hold it on all cylinders.

[Tokay444]

If your gauge doesn't stick at the highest registered reading, it's faulty.

[5doorsoffury]

24k, tuned (20 psi)on e85 at 9k .
I ran my etune every day.
195-193-193-193
Matco tester

[MSMS3]

190, 190, 182, 190. 92,000 miles. Original K04. Never smoked even running catless downpipe since the first year. Scrupulous maintenance. Synthetic oil exclusively, initially Mobile 1 5w30 then switched to Rotella T6. Mazda oil filters. K&N cone on my Mazdaspeed/AEM CAI.

I drive the shit out if this car. There is not a day that goes by that does not see some WOT to 6,000 in 3rd or 4th, nor a week that does not see some three digit mph.

This is a stout engine. Only time the dealer has seen this car was for the VVT warranty fix and the idiots misdiagnosed that. Got that done and a new timing chain and it was making the same noise when I picked it up. Turned out to be the idler pully, which I then replaced myself. Still runs 13.2 quarters at 107-108 despite my shitty 60 ft launches. This is a 12 second car with a good driver.

[Matrix311]

Just did my first compression test of the new motor today. Used a brand new craftsman compression tester. I have 1,030 miles on the engine. During my engine breakin period I used SuperTech 10W40 oil during breakin period. Today i'm going to change the oil to Rotella T6 5w40. Could the weight of the oil cause my compression to be low in #3 ? Could the rings need more time to seat since i only have 1030 miles on the engine? Lastly should this be a major concern right now or should I just change the oil and monitor the compression over the next month?

#1 - 188
#2 - 180
#3 - 165
#4 - 185

[theurgy]

Leak down.

[Lex]

Originally Posted by Matrix311 Just did my first compression test of the new motor today. Used a brand new craftsman compression tester. I have 1,030 miles on the engine. During my engine breakin period I used SuperTech 10W40 oil during breakin period. Today i'm going to change the oil to Rotella T6 5w40. Could the weight of the oil cause my compression to be low in #3 ? Could the rings need more time to seat since i only have 1030 miles on the engine? Lastly should this be a major concern right now or should I just change the oil and monitor the compression over the next month? #1 - 188 #2 - 180 #3 - 165 #4 - 185

The motor should be broken in by now. I would do a leakdown test as suggested.

[Matrix311]

I haven't really gotten into any boost yet, maybe 11psi max over these 1,000 miles. I haven't even gone WOT yet. So I went out for a drive and did 3-4 WOT pulls, was pretty scary at first but also a blast getting into boost. Last time I went WOT I went ZZB so it was a little intimidating to do. Anywho i'm hoping this will help seat those rings since i haven't put much pressure to them yet. I did hit 20psi and flowed 410g/s so i have a feeling i'll be moving some major air as i start tuning. Hopefully what i just did i'll see a little better compression in #3 . Results to come shortly!

[Zabbin123]

Originally Posted by Matrix311 I haven't really gotten into any boost yet, maybe 11psi max over these 1,000 miles. I haven't even gone WOT yet. So I went out for a drive and did 3-4 WOT pulls, was pretty scary at first but also a blast getting into boost. Last time I went WOT I went ZZB so it was a little intimidating to do. Anywho i'm hoping this will help seat those rings since i haven't put much pressure to them yet. I did hit 20psi and flowed 410g/s so i have a feeling i'll be moving some major air as i start tuning. Hopefully what i just did i'll see a little better compression in #3 . Results to come shortly!

And what is the Verdict Eric? I have high hopes for you as of right now!

[phate]

Originally Posted by Matrix311 Just did my first compression test of the new motor today. Used a brand new craftsman compression tester. I have 1,030 miles on the engine. During my engine breakin period I used SuperTech 10W40 oil during breakin period. Today i'm going to change the oil to Rotella T6 5w40. Could the weight of the oil cause my compression to be low in #3 ? Could the rings need more time to seat since i only have 1030 miles on the engine? Lastly should this be a major concern right now or should I just change the oil and monitor the compression over the next month? #1 - 188 #2 - 180 #3 - 165 #4 - 185

Meh, is 15psi going to sway your decision to tear it down again? If it was mine, it sure wouldn't haha. I'd do another compression test just for funzies, maybe a leakdown, then run the hell out of it.

[Lex]

I wouldn't tear it down unless you have other issues crop up such as blowby, KR, oil consumption, lack of power.

[timjs]

I agree, it doesn't make sense to get worried over that small amount, unless of course it continues to deteriorate with more mileage.
I'm OCD about these things though, I'd probably leak down just to know where that 15 psi is going..

[mtosofsky]

I haven't really gotten into any boost yet, maybe 11psi max over these 1,000 miles. I haven't even gone WOT yet. So I went out for a drive and did 3-4 WOT pulls, was pretty scary at first but also a blast getting into boost. Last time I went WOT I went ZZB so it was a little intimidating to do. Anywho i'm hoping this will help seat those rings since i haven't put much pressure to them yet. I did hit 20psi and flowed 410g/s so i have a feeling i'll be moving some major air as i start tuning. Hopefully what i just did i'll see a little better compression in #3 . Results to come shortly!

This made me sad=[ I followed your build the entire time and marveled at all the parts and that garage. I agree with the others though. Unless you notice some bad sign happening, i'd just enjoy the car as much as possible.

[DSIT995]

Originally Posted by Matrix311 Just did my first compression test of the new motor today. Used a brand new craftsman compression tester. I have 1,030 miles on the engine. During my engine breakin period I used SuperTech 10W40 oil during breakin period. Today i'm going to change the oil to Rotella T6 5w40. Could the weight of the oil cause my compression to be low in #3 ? Could the rings need more time to seat since i only have 1030 miles on the engine? Lastly should this be a major concern right now or should I just change the oil and monitor the compression over the next month? #1 - 188 #2 - 180 #3 - 165 #4 - 185

When u do a comp test do you crank all the cylinders the same # of times or keep cranking til the needle stops?

I only ask since I need to crank #3 more than the others

[theurgy]

The other obvious question.. was the engine warm or cold?
Did you try adding the teaspoon of oil into cylinder #3 and retest?

[Matrix311]

Originally Posted by phate Meh, is 15psi going to sway your decision to tear it down again? If it was mine, it sure wouldn't haha. I'd do another compression test just for funzies, maybe a leakdown, then run the hell out of it.

No its not going to sway my decision to tear it down again at this moment. Only if things get worse i'll consider tearing back into it but as of now, with such a young engine and I've hardly pushed the limits of it, i'm going to drive it aggressively and monitor oil consumption and what not to see if anything changes. Again I've only hit 11psi boost on a safe tune map for the first 1,000 miles. Just a little bit ago I came home from doing my first WOT logs and hit 20psi so thats the most stress and power the engine has seen thus far.

Originally Posted by phate Meh, is 15psi going to sway your decision to tear it down again? If it was mine, it sure wouldn't haha. I'd do another compression test just for funzies, maybe a leakdown, then run the hell out of it.

Originally Posted by Lex I wouldn't tear it down unless you have other issues crop up such as blowby, KR, oil consumption, lack of power.

Agreed! Hopefully I dont get any blowby with everything I've done to it. I'm running dual catch cans (1 sealed and 1 vta) with a DIY perm plate I made and I have my pcv setup just like this. I would assume this setup would provide the most flow of crank case pressure possible.

[Zabbin123]

Did you shit your pants? haha

[Matrix311]

Originally Posted by timjs I agree, it doesn't make sense to get worried over that small amount, unless of course it continues to deteriorate with more mileage. I'm OCD about these things though, I'd probably leak down just to know where that 15 psi is going..

I'm OCD as well, this is why this stupid compression test is killing me, yet the car is running like a champ and feels amazing with only the base map i'm running ATM.

Originally Posted by theurgy The other obvious question.. was the engine warm or cold? Did you try adding the teaspoon of oil into cylinder #3 and retest?

Engine was very warm, I had just got back from doing 3-4 WOT LOGS and right when I got home I started doing the compression test. Same results as before with no change. I have not added a teaspoon of oil to the cylinder yet, what would that do? Lets say I do add oil to it and i run the test again and compression is up to say 180-185, what does that mean or let say I add oil and run the test and compression doesnt change and remains at 160-165, what does that mean?

Originally Posted by DSIT995 When u do a comp test do you crank all the cylinders the same # of times or keep cranking til the needle stops? I only ask since I need to crank #3 more than the others

I did them all differently, i just cranked it over like 3-4 times each about 2-3 seconds per crank or until the needle stopped moving. I did try #3 a little more and it made no change that I saw.

Originally Posted by Zabbin123 Did you shit your pants? haha

I may have sharted a bit yes

[timjs]

If you did a wet test (adding oil) and the compression raises significantly, then it indicates a ring sealing issue.
If it doesn't raise significantly, it indicates valves, head gasket, or injector seal.

The issue with wet tests is a lot of people pour way too much oil in there, and the compression DOES go up, but because all the space taken up by the excessive amount of oil actually raises the compression ratio. Therefore the test is inconclusive.

[atvfreek]

Originally Posted by timjs If you did a wet test (adding oil) and the compression raises significantly, then it indicates a ring sealing issue. If it doesn't raise significantly, it indicates valves, head gasket, or injector seal. The issue with wet tests is a lot of people pour way too much oil in there, and the compression DOES go up, but because all the space taken up by the excessive amount of oil actually raises the compression ratio. Therefore the test is inconclusive.

That's why it's important to test every cylinder using the same amount of oil and not just test the "low" cylinder. Then you can compare the differences in each

[Matrix311]

Originally Posted by timjs If you did a wet test (adding oil) and the compression raises significantly, then it indicates a ring sealing issue. If it doesn't raise significantly, it indicates valves, head gasket, or injector seal. The issue with wet tests is a lot of people pour way too much oil in there, and the compression DOES go up, but because all the space taken up by the excessive amount of oil actually raises the compression ratio. Therefore the test is inconclusive.

Thanks for the heads up! I'll do just a cap full of oil in each chamber and run the test to see what results are yielded.

[timjs]

Sounds good, but a leakdown test will tell more, if you are able to do one.

[Matrix311]

Originally Posted by timjs Sounds good, but a leakdown test will tell more, if you are able to do one.

yep a local guy has a tester, i'm going to do a wet test first and then a leakdown test. Hopefully have that leakdown test done before the end of the weekend.

[timjs]

I'm sure you know this, but don't do a leakdown with the oil still there. Burn it off first.

[[R]usty]

Had some time last night to do a compression test after doing some logs for my tune. Last compression test was about 5000 miles ago. Since then I've been beating the shit out of my car with new tunes and of course a custom tune this whole last month with Lex. Car as of a few days ago has 47,000 hard earned miles.

1 - 180
2 - 177
3 - 180
4 - 177


I'm very happy about these results. This motor has been absolutely rock solid since I got it.

[BackRoads]

Originally Posted by rustysurfsa Had some time last night to do a compression test after doing some logs for my tune. Last compression test was about 5000 miles ago. Since then I've been beating the shit out of my car with new tunes and of course a custom tune this whole last month with Lex. Car as of a few days ago has 47,000 hard earned miles. 1 - 180 2 - 177 3 - 180 4 - 177 I'm very happy about these results. This motor has been absolutely rock solid since I got it.

Yeah, that's awesome. You should be good for a long haul. I'm at 155-ish at 182,500 miles, so there can certainly be longevity in this engine.

[Matrix311]

looking good guys!