Suzuki SX4 Sedan - Compression - Suzuki Forums: Suzuki Forum Site
Suzuki Forum Suzuki Forums

» Auto Insurance
» Featured Product
Wheel & Tire Center

Go Back   Suzuki Forums: Suzuki Forum Site > Suzuki Models > Other Suzuki Models > Suzuki SX4 Forum
Register Home Forum Active Topics Photo Gallery Garage Search Today's Posts Mark Forums Read Auto EscrowAuto LoansInsurance Advertise

Suzuki-Forums.com is the premier Suzuki All Forum on the internet. Registered Users do not see the above ads.
Closed Thread
 
LinkBack Thread Tools Display Modes
Old 10-12-2018, 06:52 PM   #1 (permalink)
Newbie
 
Join Date: May 2018
Posts: 17
Gallery: 0
Brian84 is on a distinguished road
Default Suzuki SX4 Sedan - Compression

Hi,

I own Suzuki SX4 Sedan (2012 - J20B engine), automatic transmission.
I'm interested how much it needs to be compressed for a new car just bought?

I am confused because some people say 180 ish and some people say 160 ish
and it also depends on the sea altitude when compression is measured.

Supposedly not the same to measure on 3.500 meters sea altitud or 300 metars sea altitud. If so, what is the difference in ish?

Last edited by Brian84; 10-12-2018 at 07:12 PM.
Brian84 is offline   Quick reply to this message
Sponsored Links
Advertisement
 
Old 10-13-2018, 05:44 AM   #2 (permalink)
LMP
Veteran
 
LMP's Avatar
 
Join Date: Oct 2011
Location: Chicoutimi, Saguenay,Qc,Canada
Posts: 796
Gallery: 1
LMP is on a distinguished road
Default

so..at what altitude are you? and where ?
at 3500m (11500ft) , air pressure is 9.6 psi....instead of 14.7 (absolute) at sea level.
__________________
2011 sx4 JX 2.0 AWD CVT at 35500km(may2019)- 1928 Model 629 Graham-Paige - 1993 Pontiac Transport 3.8 - 2015 Kia Sorrento 2.4 AWD - 1994 Kawasaki Ninja EX250

Last edited by LMP; 10-13-2018 at 06:06 AM.
LMP is offline   Quick reply to this message
Old 10-14-2018, 04:01 PM   #3 (permalink)
Newbie
 
Join Date: May 2018
Posts: 17
Gallery: 0
Brian84 is on a distinguished road
Default

Quote:
Originally Posted by LMP View Post
so..at what altitude are you? and where ?
at 3500m (11500ft) , air pressure is 9.6 psi....instead of 14.7 (absolute) at sea level.

I'm at a altitude of 400 meters. My car has 82.000 mile and its compression is 160 psi.

That's why I'm interested in what compression has a new car just bought.
Brian84 is offline   Quick reply to this message
 
Old 10-16-2018, 08:57 PM   #4 (permalink)
Newbie
 
Join Date: May 2018
Posts: 17
Gallery: 0
Brian84 is on a distinguished road
Default

Nobody knows the answer to my question?
Brian84 is offline   Quick reply to this message
Old 10-17-2018, 12:32 AM   #5 (permalink)
Veteran
 
Join Date: Sep 2014
Location: New Zealand
Posts: 3,715
Gallery: 0
2013GV is on a distinguished road
Default

Quote:
Originally Posted by Brian84 View Post
I'm at a altitude of 400 meters. My car has 82.000 mile and its compression is 160 psi.

That's why I'm interested in what compression has a new car just bought.
is that cold? hot? and fully charged battery and WOT? sounds reasonable if thats cold with that many miles
__________________
2015 5 dr Grand Vitara 2.4 (daily driver)
1971 V8 HG Holden with 383 stroker 9" torq lok and TH350 trans (the toy)
Mitzi RVR 2.0 (not one of my better buys)
the 2013 3 dr GV is now the off road only toy

"Dogs feel very strongly that they should always go with you in the car, in case the need should arise for them to bark violently at nothing right in your ear."
2013GV is offline   Quick reply to this message
Old 10-17-2018, 02:57 AM   #6 (permalink)
LMP
Veteran
 
LMP's Avatar
 
Join Date: Oct 2011
Location: Chicoutimi, Saguenay,Qc,Canada
Posts: 796
Gallery: 1
LMP is on a distinguished road
Default

Yes.
Take all 4 spark plugs out, test compression on all, if they are the same within little margin, all is OK.
Now if we have to go by the numbers…at 400 meters, absolute “normal” atmospheric pressure (actual value varies a little) is 14 psi. Compression ratio is 10.2. Isothermic compression without losses would bring this to 143 psi absolute, 129 gauge. But rapid compression approaches adiabatic, meaning an increase in temperature, hence pressure. The engine condition, temperature and cranking speed and atmospheric air temperature do have an effect on this and this is why those variations may bring different results, like something similar on all cylinders probably between 160 and 180 gauge….but predicting an exact value is futile.
As long as all cylinders all have a value close to each other in the above range, like the 160 you mention, it is OK….
__________________
2011 sx4 JX 2.0 AWD CVT at 35500km(may2019)- 1928 Model 629 Graham-Paige - 1993 Pontiac Transport 3.8 - 2015 Kia Sorrento 2.4 AWD - 1994 Kawasaki Ninja EX250

Last edited by LMP; 10-17-2018 at 03:05 AM.
LMP is offline   Quick reply to this message
Old 10-17-2018, 01:56 PM   #7 (permalink)
Newbie
 
Join Date: May 2018
Posts: 17
Gallery: 0
Brian84 is on a distinguished road
Default

Quote:
Originally Posted by 2013GV View Post
is that cold? hot? and fully charged battery and WOT? sounds reasonable if thats cold with that many miles

It's hot with the battery in normal condition (not a new battery).
Brian84 is offline   Quick reply to this message
Old 10-20-2018, 04:57 PM   #8 (permalink)
Newbie
 
Join Date: May 2018
Posts: 17
Gallery: 0
Brian84 is on a distinguished road
Default

.. and does anyone know the answer?
Brian84 is offline   Quick reply to this message
Old 10-20-2018, 05:19 PM   #9 (permalink)
Veteran
 
Join Date: Sep 2014
Location: New Zealand
Posts: 3,715
Gallery: 0
2013GV is on a distinguished road
Default

Quote:
Originally Posted by Brian84 View Post
.. and does anyone know the answer?
the figures are ok, its the difference between them thats more of an issue, you just say "160 psi" but don't list each cylinder.

15 psi or more difference between cyls requires further investigation

As long as battery is fully charged overnight before hand, and wide open throttle with all the other plugs removed then figures are ok. Do a cold test, dry and wet (teaspoon of new clean engine oil down the cyl just before the test is a "wet" test) and note readings.

Hot tests are not all that good, and quite often inaccurate.
__________________
2015 5 dr Grand Vitara 2.4 (daily driver)
1971 V8 HG Holden with 383 stroker 9" torq lok and TH350 trans (the toy)
Mitzi RVR 2.0 (not one of my better buys)
the 2013 3 dr GV is now the off road only toy

"Dogs feel very strongly that they should always go with you in the car, in case the need should arise for them to bark violently at nothing right in your ear."

Last edited by 2013GV; 10-20-2018 at 05:22 PM.
2013GV is offline   Quick reply to this message
Old 10-20-2018, 09:13 PM   #10 (permalink)
Newbie
 
Join Date: May 2018
Posts: 17
Gallery: 0
Brian84 is on a distinguished road
Default

Do you know how much compression has a new SX4 car just bought?
Brian84 is offline   Quick reply to this message
Sponsored Links
Advertisement
 
Closed Thread

  Suzuki Forums: Suzuki Forum Site > Suzuki Models > Other Suzuki Models > Suzuki SX4 Forum

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Suzuki Forums: Suzuki Forum Site forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Insurance
Please select your insurance company (Optional)

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:41 PM.



Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.