Compression test... - 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 > Suzuki Jimny, Sierra & Samurai 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.
Reply
 
LinkBack Thread Tools Display Modes
Old 03-23-2011, 11:06 AM   #1 (permalink)
Member
 
sohcneondriver's Avatar
 
Join Date: Jan 2011
Posts: 69
Gallery: 0
sohcneondriver is on a distinguished road
Garage
Default Compression test...

What do you guys think about these numbers?

#1 130 psi.
#2 150 psi.
#3 120 psi.
#4 115 psi.

I don't have a tach so I don't actually know the rpm that was at but I did the check with all the plugs out at the same time and a strong newer battery.

The engine smokes pretty bad at times so I was beginning to suspect the rings, and I thought maybe a compression test would tell me something. It also has a massive oil leak (I lose a quart about every 25 miles). So I'm considering taking the engine out and doing a rebuild, just can't decide if I'll be able to do it myself or not...
sohcneondriver is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 03-23-2011, 11:24 AM   #2 (permalink)
Veteran
 
ranger88den's Avatar
 
Join Date: May 2006
Location: NW Ohio
Posts: 4,278
Gallery: 0
ranger88den is an unknown quantity at this point
Default

Did you do the test WOT with all plugs out?
__________________
1997 Geo Tracker, 2dr convertible/hardtop, 1.6, 16v, 5 spd manual, 4wd
1995 Geo Tracker, 2dr convertible/hardtop, 1.6, 16v, 3 spd auto, 4wd
1995 Geo Tracker, 2dr convertible/hardtop, 1.6, 16v, 3 spd auto, 4wd
1992 Geo Tracker LSI, 2 dr convertible, 1.6, 8v, 5 spd manual, 4wd
1991 Geo Tracker, 2dr hardtop (TT), 1.6, 8v, 3 spd auto, 4wd
1994 Geo Tracker, 2 dr convertible, 1.6, 8v, 5 spd manual, 4wd

1988 Ford Ranger, p/u, 2.9, 3pd auto


RUST NEVER SLEEPS IN THE RUSTBELT!
ranger88den is offline   Reply With Quote Quick reply to this message
Old 03-23-2011, 01:38 PM   #3 (permalink)
Member
 
sohcneondriver's Avatar
 
Join Date: Jan 2011
Posts: 69
Gallery: 0
sohcneondriver is on a distinguished road
Garage
Default Nope...

Nope, forgot about WOT. Is it standard to do it that way? I'll probably test it again today anyway because I want to see if it comes up with a little oil poured in the cylinder.
sohcneondriver is offline   Reply With Quote Quick reply to this message
 
Old 03-23-2011, 02:04 PM   #4 (permalink)
Veteran
 
ranger88den's Avatar
 
Join Date: May 2006
Location: NW Ohio
Posts: 4,278
Gallery: 0
ranger88den is an unknown quantity at this point
Default

How to do compression test?
This is from the Kick-Fix website regarding Trackers & Sidekicks but is applicable.
__________________
1997 Geo Tracker, 2dr convertible/hardtop, 1.6, 16v, 5 spd manual, 4wd
1995 Geo Tracker, 2dr convertible/hardtop, 1.6, 16v, 3 spd auto, 4wd
1995 Geo Tracker, 2dr convertible/hardtop, 1.6, 16v, 3 spd auto, 4wd
1992 Geo Tracker LSI, 2 dr convertible, 1.6, 8v, 5 spd manual, 4wd
1991 Geo Tracker, 2dr hardtop (TT), 1.6, 8v, 3 spd auto, 4wd
1994 Geo Tracker, 2 dr convertible, 1.6, 8v, 5 spd manual, 4wd

1988 Ford Ranger, p/u, 2.9, 3pd auto


RUST NEVER SLEEPS IN THE RUSTBELT!
ranger88den is offline   Reply With Quote Quick reply to this message
Old 03-23-2011, 02:17 PM   #5 (permalink)
Veteran
 
Join Date: Jan 2008
Location: San Diego, CA
Posts: 1,230
Gallery: 0
Baratacus is on a distinguished road
Default

theres no need to do a WOT test. The WOT compression test goes under the premise that without the throttle plate held wide open, you won't get a full air charge into the cylinder for it to compress. However, when cranking the engine, the engine rpms are hardly enough to register as a twitch on your tachometer. At that RPM, the throttle plate is open enough for the engine to start up, which is all you need for a compression test. WOT is unnecesary. You may see the compression come up with fewer cranks, but your peak compression won't be any higher or lower if you crank it till it peaks.

Now as far as a wet test, you may get some higher numbers with that.

When you say that your engine is going through a quart every 25 miles, is that leaking or is that burning?

Last edited by Baratacus; 03-23-2011 at 02:33 PM.
Baratacus is offline   Reply With Quote Quick reply to this message
Old 03-24-2011, 05:20 AM   #6 (permalink)
Full Member
 
Join Date: Jan 2011
Location: Darwin N.T.
Posts: 105
Gallery: 5
lokdzuk is on a distinguished road
Garage
Default

i had the problem of my engine smoking and it needed a rebuild but it was making a horrible tapping noise from the piston going to far up and down. it took me 8 hours to take the engine out and put it back in. i only needed a few sockets and spanners didn't need engine crane cos the engine only weighs 60 70 kilos and i just lifted it out by hand.
lokdzuk is offline   Reply With Quote Quick reply to this message
Old 03-24-2011, 08:47 AM   #7 (permalink)
Member
 
sohcneondriver's Avatar
 
Join Date: Jan 2011
Posts: 69
Gallery: 0
sohcneondriver is on a distinguished road
Garage
Default

Baratacus
It is doing both but I'm pretty sure most of the loss is from leaking. However it does seem to smoke worse every day. I've only put 100 miles on it since I got it and when I got it there were no problems (that I knew of) except a fair oil leak.

Oh, and now I am leaking gas, too. It leaves a puddle wherever I park it. I think the tank has rusted through.
sohcneondriver is offline   Reply With Quote Quick reply to this message
Old 03-24-2011, 08:49 AM   #8 (permalink)
Member
 
sohcneondriver's Avatar
 
Join Date: Jan 2011
Posts: 69
Gallery: 0
sohcneondriver is on a distinguished road
Garage
Default

lokdzuk
Did you do the engine work youself, or just the pulling the engine out and putting it back in part?
sohcneondriver is offline   Reply With Quote Quick reply to this message
Old 03-24-2011, 09:51 AM   #9 (permalink)
Member
 
Join Date: Mar 2011
Location: New Smyrna FL
Posts: 44
Gallery: 0
CAMISAMI is on a distinguished road
Default

Those numbers are low but the really telling part is the difference between cyl. The difference should be 10% or less which yours is not. The oil loss is probably from blow -by. Try a wet [little oil in each cyl] compression if you get a fairly large rise the rings are leaking in that cyl also if not probably a bad valve. bottom line is at least a rering and head work.
CAMISAMI is offline   Reply With Quote Quick reply to this message
Old 03-24-2011, 10:35 AM   #10 (permalink)
Veteran
 
Join Date: Jan 2008
Location: San Diego, CA
Posts: 1,230
Gallery: 0
Baratacus is on a distinguished road
Default

with any luck its just the rings. You need to check that fuel leak out though. It may be something as easy as cracked hose to the fuel filter. Check your fuel pump too while your checking stuff. If it's dripping fuel out the bottom drain of the pump then the diaphragm is ruptured and you could be getting fuel into your oil. This will damage your seals and break down the oil. It will destroy your engine in a big hurry. Since you mentioned it was running fine when you got it, I just thought I'd throw that out there as something to look at as far as a possible cause for advanced engine wear.
Baratacus is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

  Suzuki Forums: Suzuki Forum Site > Suzuki Models > Suzuki Jimny, Sierra & Samurai 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 09:06 AM.



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.