Compression test

dzenno · 03-31-2011, 09:28 PM

Had a compression test done at BMW the other day. Numbers look great, all cylinders close to each other. This was done with a BMW tool following their documented procedure. End result is this tiny card about 1.5"x1.5" in size

thought you might find it interesting to see

Clap135 · 03-31-2011, 09:35 PM

Roughly speaking the lowest cylinder was about 18.2 bar which is roughly 264psi
and the highest one was 19.5 which is 282psi.

I don't know what the spec is suppose to be, but they all seem high to me. I am used to seeing pressures in the 150-180 range on all the cars I ever did.

dzenno · 03-31-2011, 09:48 PM

I'll do it myself as well soon but I wanted to have a "reference" from them...

vasillalov · 03-31-2011, 10:00 PM

Quote:

Originally Posted by Clap135

Roughly speaking the lowest cylinder was about 18.2 bar which is roughly 264psi
and the highest one was 19.5 which is 282psi.

I don't know what the spec is suppose to be, but they all seem high to me. I am used to seeing pressures in the 150-180 range on all the cars I ever did.

Agreed. Those seem rather high numbers. The good news is that they all seem to fall close within each other.

boostd92 · 04-01-2011, 10:49 AM

I'm used to seeing 180-200 for lower compression turbo cars (8-9:1).

If that chart is including atmospheric pressure of 1 bar, the numbers would be in the 240psi range mostly. Probably good for a higher compression DI car.

Jeff@TopGearSolutions · 04-01-2011, 11:18 AM

Never seen numbers that high either, but I hear it just matters if they are all close in relation to one another.

shifterboy45 · 04-01-2011, 11:54 AM

no matter the numbers (hi or lo) if they are all consistent thats what matters.

if the concern is carboned up combustion chambers, it would show in areas of drivabilty

enrita · 04-01-2011, 12:44 PM

Great work dzenno! Good reference point.

mazdaspeed6 · 04-01-2011, 06:22 PM

they are suppose to be around 200 from what i was told by my tech

dzenno · 04-01-2011, 06:30 PM

Recommend everyone especially those with upgraded turbos or those about to get them to test your engines and see where you stand..in case numbers don't look right I'd stay away from further modding and trade your car in

Ilma · 04-01-2011, 10:52 PM

Lol.....

You should go show that to the dealer who tried to convince you of a leaking head gasket

dzenno · 04-02-2011, 12:01 AM

Quote:

Originally Posted by Ilma

Lol.....

You should go show that to the dealer who tried to convince you of a leaking head gasket

I know eh

should get my money back lol

03-31-2011, 09:28 PM	#1
dzenno Banned 273 Rep 5,876 Posts Drives: Join Date: Feb 2006 iTrader: (1)	Compression test - 1st in 3 years :) Had a compression test done at BMW the other day. Numbers look great, all cylinders close to each other. This was done with a BMW tool following their documented procedure. End result is this tiny card about 1.5"x1.5" in size thought you might find it interesting to see
	Appreciate 0 Tweet Quote

03-31-2011, 09:35 PM	#2
Clap135 Brigadier General 103 Rep 3,460 Posts Drives: 2009 N54 Join Date: Jul 2009 Location: Sticky's Mom House iTrader: (1)	Roughly speaking the lowest cylinder was about 18.2 bar which is roughly 264psi and the highest one was 19.5 which is 282psi. I don't know what the spec is suppose to be, but they all seem high to me. I am used to seeing pressures in the 150-180 range on all the cars I ever did.
	Appreciate 0 Quote

03-31-2011, 09:48 PM	#3
dzenno Banned 273 Rep 5,876 Posts Drives: Join Date: Feb 2006 iTrader: (1)	I'll do it myself as well soon but I wanted to have a "reference" from them...
	Appreciate 0 Quote

04-01-2011, 10:49 AM	#5
boostd92 Captain 62 Rep 759 Posts Drives: '11 E92 M-Sport Join Date: Jun 2009 Location: Chicago, IL iTrader: (1) Garage List 2011 BMW 335i M-Spo ... [7.26]	I'm used to seeing 180-200 for lower compression turbo cars (8-9:1). If that chart is including atmospheric pressure of 1 bar, the numbers would be in the 240psi range mostly. Probably good for a higher compression DI car.
	Appreciate 0 Quote

04-01-2011, 11:18 AM	#6
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Never seen numbers that high either, but I hear it just matters if they are all close in relation to one another.
	Appreciate 0 Quote

04-01-2011, 11:54 AM	#7
shifterboy45 Major 23 Rep 1,179 Posts Drives: 2009 335i Coupe Join Date: Feb 2009 Location: North by Northwest iTrader: (0)	no matter the numbers (hi or lo) if they are all consistent thats what matters. if the concern is carboned up combustion chambers, it would show in areas of drivabilty
	Appreciate 0 Quote

04-01-2011, 12:44 PM	#8
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	Great work dzenno! Good reference point. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
	Appreciate 0 Quote

04-01-2011, 06:22 PM	#9
mazdaspeed6 Second Lieutenant 13 Rep 272 Posts Drives: 335i Join Date: Dec 2009 Location: ct iTrader: (2)	they are suppose to be around 200 from what i was told by my tech __________________ car for sale
	Appreciate 0 Quote

04-01-2011, 06:30 PM	#10
dzenno Banned 273 Rep 5,876 Posts Drives: Join Date: Feb 2006 iTrader: (1)	Recommend everyone especially those with upgraded turbos or those about to get them to test your engines and see where you stand..in case numbers don't look right I'd stay away from further modding and trade your car in
	Appreciate 0 Quote

04-01-2011, 10:52 PM	#11
Ilma Colonel 184 Rep 2,841 Posts Drives: 2008 135i Join Date: Nov 2008 Location: Mississauga iTrader: (0)	Lol..... You should go show that to the dealer who tried to convince you of a leaking head gasket
	Appreciate 0 Quote