default psi readings - MINI Cooper Forum
Go Back   MINI Cooper Forum > Model Specific MINI Forums > MINI Cooper S > Second Generation MINI Cooper S


Second Generation MINI Cooper S MINI Cooper S Late 2006 - Present

Mini2.com is the premier Mini Cooper Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Rate Thread
  #1 (permalink)  
Old May 26th, 2014, 06:03 PM
MINI2 Regular
Offline
 
Join Date: Oct 2007
Posts: 175
Local Time: 03:48 PM
default psi readings

What would be the default psi readings of a compression test for a 2008 R56S? Does BMW documentate the default readings somewhere in the manual?
Reply With Quote
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old May 26th, 2014, 06:46 PM
MINI2 Master
Offline
 
Join Date: Feb 2011
Location: South london
Posts: 1,190
Local Time: 04:48 PM
United Kingdom Male
Hi ya

Most people do a leak down check it's a much better way of finding faults and more accurate.
But if your doing a comp test you should be reading around 180psi roughly on a comp test. But the most important thing is the discrepancy between cylinders you don't want more than a 10-15 psi difference between cylinders.
Reply With Quote
  #3 (permalink)  
Old May 26th, 2014, 08:43 PM
MINI2 Regular
Offline
 
Join Date: Oct 2007
Posts: 175
Local Time: 03:48 PM
on my car i got a 160psi reading in all cylinders
Reply With Quote
  #4 (permalink)  
Old May 26th, 2014, 09:28 PM
MINI2 Master
Offline
 
Join Date: Feb 2011
Location: South london
Posts: 1,190
Local Time: 04:48 PM
United Kingdom Male
Hi ya

Seems a little low But as long as there all the same it's not to bad, and if you did not have the throttle wide open it will effect the out come, so 160 may not be to bad. if your worried do a leak down check on it.

So many things affect compression and all engines vary slightly.
Also stick a can of bg109 in it before you do an oil change. And check for carboning of your inlets valves
Reply With Quote
Thanks for this post from:
  #5 (permalink)  
Old May 26th, 2014, 10:06 PM
MINI2 Regular
Offline
 
Join Date: Oct 2007
Posts: 175
Local Time: 03:48 PM
Quote: Originally Posted by marque (original)
Also stick a can of bg109 in it before you do an oil change. And check for carboning of your inlets valves

Please rephrase and elaborate in depth if possible, i didnt get it.
Reply With Quote
  #6 (permalink)  
Old May 27th, 2014, 11:18 AM
MINI2 Master
Offline
 
Join Date: Feb 2011
Location: South london
Posts: 1,190
Local Time: 04:48 PM
United Kingdom Male
Quote: Originally Posted by genik (original)
Please rephrase and elaborate in depth if possible, i didnt get it.

Ok so bg109 if you search the net you will see it is an additive you can add to your oil, you can put it before you do an oil change or half way throw a service cycle. It is designed to last one heat cycle then turn inert. but Personally i do it before the oil change. I don't see the point of putting something in to help clean out the oil system then not flushing all the crap out.
The bg109 removes and cleans the oil system and removes sludge and contaminates in your oil system, but the reason why I recommended it to you to use it for your application it also removes varnish, carbon build up and sludge from the piston rings allowing them to work as they were designed. Which would also help if your rings were starting or causing the low compression problem. Remember prevention is better than the cure. But don't think you can put in a can and you will have 200psi comp reading does not work like that.

In an engine carbon is and always has been the enemy. carbon is abrasive so in very basic terms, you are turning a lubricant ( your engine oil) in to a fine grinding paste which will cause wear which then over time kills your engine. This carbon turns to sludge over heat cycles causing all kinds of problems.

I always change oil every 6000 miles and use a bg service pack containing bg44k, bg109, bgMOA.

I hope this is In depth enough with out getting it to oil technology and metallurgy.

With ref to the intake valve, carboning of the valves it is a know problem with the r56 i have seen these valves so carboned up they have caused compression problems
This is why I mentioned about the inlet valves

Ps did you do you comp check with engine hot or cold

Hope this helps
Reply With Quote
Thanks for this post from:
  #7 (permalink)  
Old May 27th, 2014, 08:05 PM
MINI2 Regular
Offline
 
Join Date: Oct 2007
Posts: 175
Local Time: 03:48 PM
I did have a comp check with engine mid (not too hot, not cold) it showed 160 in all cylinders,
Reply With Quote
Sponsored Links
Advertisement
 
Reply


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

Posting Rules
You may not post new threads
You may not 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

» Recent Threads
Cooper S judders when idle...
Jul 17th, 2010 04:53 PM
by ben_uk
Last post by Blusox
Today 03:35 PM
5 Replies, 951 Views
No spray on windshield wiper
Oct 19th, 2014 08:54 PM
by mom7x
Last post by CCroker
Today 01:57 PM
2 Replies, 306 Views
Will I get jipped?
Oct 21st, 2014 11:14 PM
Last post by CCroker
Today 01:52 PM
3 Replies, 246 Views
Rear wiper motor stem problem
Oct 18th, 2014 09:57 AM
Last post by ihughes
Today 01:34 PM
4 Replies, 469 Views
2010 Cooper S
Today 01:13 PM
Last post by mike_1979
Today 01:13 PM
0 Replies, 46 Views
Lights on warning not working
Oct 21st, 2014 11:42 AM
by S2dicky
Last post by tomf
Today 11:39 AM
3 Replies, 310 Views
2001 Mini Cooper - heater not working
Yesterday 08:41 AM
by TreezaB
Last post by TreezaB
Today 07:48 AM
2 Replies, 224 Views
$95 @ Willow Springs Streets of Willow November 15-16 2014
Today 01:37 AM
by harvie
Last post by harvie
Today 01:37 AM
0 Replies, 93 Views
Mini Clubman Barn Doors Won't Lock
Yesterday 03:51 AM
Last post by WeeBad
Today 12:48 AM
1 Replies, 251 Views
PAS Fluid Leak HELP!!
Oct 15th, 2014 07:16 PM
Last post by mab01uk
Yesterday 10:59 PM
7 Replies, 648 Views
Problem after problem!! Help please!!
Yesterday 08:32 PM
Last post by mab01uk
Yesterday 10:50 PM
1 Replies, 336 Views
Wheel arch - advice please :)
Yesterday 10:08 PM
Last post by mab01uk
Yesterday 10:43 PM
1 Replies, 108 Views
The new MINI voted "Classic of the Future"
Yesterday 07:08 PM
by mab01uk
Last post by Caveman
Yesterday 09:04 PM
1 Replies, 137 Views
Power Steering - not gone but acting up
Yesterday 02:23 PM
Last post by Caveman
Yesterday 09:01 PM
2 Replies, 193 Views
Bonnet gap bigger on one side
Oct 15th, 2014 05:28 PM
Last post by chris0074
Yesterday 08:42 PM
10 Replies, 999 Views
Fuel Consumption in Mini Cooper D 2014
Oct 21st, 2014 08:09 PM
Last post by chris0074
Yesterday 08:41 PM
7 Replies, 327 Views
MINI Customer Support - Spec list via VIN number
Yesterday 02:46 PM
Last post by chris0074
Yesterday 08:31 PM
5 Replies, 219 Views
R56 Aux input volume???????
Oct 20th, 2014 04:00 PM
Last post by peteski2014
Yesterday 07:31 PM
3 Replies, 438 Views
sunroof issue seeking repair suggestions in Toronto
Yesterday 07:19 PM
by wheaten
Last post by wheaten
Yesterday 07:19 PM
0 Replies, 106 Views
Start/Stop engine button illuminated when car is locked
Oct 21st, 2014 08:07 PM
Last post by chris0074
Yesterday 07:09 PM
5 Replies, 308 Views
» Premium
» Auto Insurance
Wheel & Tire Center

Powered by vBadvanced CMPS v3.2.1

All times are GMT. The time now is 03:48 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.3.2