Got results from Leakdown test

BLKPERL · 04-05-2006, 11:04 AM

Compression test:
1-190
2-195
3-200
4-200

Leakdown test:
1-5%
2-9%
3-5%
4-5%

My mechanic told me <3 0% leakdown is OK
Is this good?

If APR doesn't find this engine as healthy for Stage 3+ tuning, then I'll be ordering the GT2871R eliminator turbo kit with unitronic software from Renn-art

**Kris Hansen** · 04-05-2006, 11:06 AM

mAd1(gt3071r) · 04-05-2006, 11:09 AM

BLKPERL · 04-05-2006, 11:09 AM

2001's don't have software yet, so I might be the test car. APR told me to get a leakdown to make sure the engine is good

BLKPERL · 04-05-2006, 11:10 AM

mAd1(gt3071r) · 04-05-2006, 11:11 AM

wolfpack5 · 04-05-2006, 11:14 AM

I think the limit is closer to 15% (BMW anyway). Your numbers look good, tho.

**Kris Hansen** · 04-05-2006, 11:22 AM

seals internally well. it's when you have 2 or 3 relly good, and the rest not so good that you start doing leakdown tests on the bad holes.

BSCA4 · 04-05-2006, 11:22 AM

**Kris Hansen** · 04-05-2006, 11:30 AM

A leakdown test can help you pinpoint a more severe problem.

While a compression test is a dynamic test (engine moving), a cylinder leakdown test (C.L.T.) is a static test (engine at rest). The compression test measures how much pressure the engine can produce while cranking; in contrast to the C.L.T., which measures how much pressure is lost in the engine. In a C.L.T. the engine is placed on TDC of the cylinder in question and using a similar type of connector as the compression test, we fill the cylinder with pressure. The tester then measures the volume of air needed to maintain a predetermined pressure in the cylinder. This reading is expressed in a percentage. Good cylinder leakdown readings should be below 5-8%.

The great thing about C.L.T. is that it deals with how well the cylinder is sealing and nothing else. The readings are not affected by carbon deposits, cam timing, or even engine cranking speed.

Another great feature of the C.L.T. is the fact that you can hear where the air is leaking out of the cylinder. When a cylinder has high percentage of leakage, first check the oil filler cap. Do you hear a hissing sound? If so, you may have pressure leaking by the rings. Is there air escaping out the exhaust? Is it escaping out the intake system? Then a burned valve may be the problem. If two adjoining cylinders have similar low readings and you hear leakage out the other cylinder, then a failed head gasket may be the problem.

Being able to pinpoint the exact source of the compression loss will tell you where the problem is; and not just that you have one. This knowledge will greatly assist you in the next step... the repair.

source

04-05-2006, 11:04 AM	#1
BLKPERL Senior Member Account #: 17918 Join Date: Mar 2001 Posts: 5,493	Got results from Leakdown test Compression test: 1-190 2-195 3-200 4-200 Leakdown test: 1-5% 2-9% 3-5% 4-5% My mechanic told me <3 0% leakdown is OK Is this good? If APR doesn't find this engine as healthy for Stage 3+ tuning, then I'll be ordering the GT2871R eliminator turbo kit with unitronic software from Renn-art __________________ 2001 B5 A4 1.8TQMS CH Ecu Performance: APR Stage 3+, APR FMIC, Carbonio Intake, APR Exhaust, Cryo Southbend SS w/Unorthodox flywheel, Autospeed DTS, Forge BPV, SPAL EFK w/180 degree thermostat, S4 engine mounts, S4 fender liners Suspension: Vogtland Coilovers,H-sports, CPP Rear sway bar links Brakes: Stoptech 332mm,S4 rear brakes, Ferodo DS2500 all around Exterior: Reiger RS4 bumper (summer),S4 bumper(winter),S4 skirts,S4 rear, Tint: 35% front, 20% rear Street: 18" Silver OZ SLs,225/40 Kumho SPT Winter: 17" Flik Lex, 225/45 Dunlop Wintersport 3D Interior: S4 Silver Beltline trim,Landspeed Aluminum Shifter Plate,UUC Rob Knob w/Custom insert,Tycoon Alcantara Shift boot,LLTEK M&S mats,Beetle Sunglass holder, Valentine 1 hardwired w/LI-S4 display, Awe-Tuning pedals Sounds: RNS-E Navplus, Phatnoise Phatbox My Dyno Chart: 295 whp 277lbs My Compression & Leadown tests B5 1/4 mile database B6 1/4 mile database B7 1/4 mile database B7 Carbonio Intake Log Vag Com Data Log Vag Com Tech Section Edy Jun's FAQ

04-05-2006, 11:06 AM	#2
Kris Hansen Chief of Goat control Account #: 20 Join Date: Oct 2000 Posts: 66,548,190	Why did they do a leakdown test with nice compression numbers like those?

04-05-2006, 11:09 AM	#3
mAd1(gt3071r) Member Account #: 57175 Join Date: Jun 2003 Posts: 3,640	2nd. I' wouldn't waste time or money doing a leak down since the compression numbers are that good

04-05-2006, 11:09 AM	#4
BLKPERL Senior Member Account #: 17918 Join Date: Mar 2001 Posts: 5,493	APR Stage 3+ 2001's don't have software yet, so I might be the test car. APR told me to get a leakdown to make sure the engine is good __________________ 2001 B5 A4 1.8TQMS CH Ecu Performance: APR Stage 3+, APR FMIC, Carbonio Intake, APR Exhaust, Cryo Southbend SS w/Unorthodox flywheel, Autospeed DTS, Forge BPV, SPAL EFK w/180 degree thermostat, S4 engine mounts, S4 fender liners Suspension: Vogtland Coilovers,H-sports, CPP Rear sway bar links Brakes: Stoptech 332mm,S4 rear brakes, Ferodo DS2500 all around Exterior: Reiger RS4 bumper (summer),S4 bumper(winter),S4 skirts,S4 rear, Tint: 35% front, 20% rear Street: 18" Silver OZ SLs,225/40 Kumho SPT Winter: 17" Flik Lex, 225/45 Dunlop Wintersport 3D Interior: S4 Silver Beltline trim,Landspeed Aluminum Shifter Plate,UUC Rob Knob w/Custom insert,Tycoon Alcantara Shift boot,LLTEK M&S mats,Beetle Sunglass holder, Valentine 1 hardwired w/LI-S4 display, Awe-Tuning pedals Sounds: RNS-E Navplus, Phatnoise Phatbox My Dyno Chart: 295 whp 277lbs My Compression & Leadown tests B5 1/4 mile database B6 1/4 mile database B7 1/4 mile database B7 Carbonio Intake Log Vag Com Data Log Vag Com Tech Section Edy Jun's FAQ

04-05-2006, 11:10 AM	#5
BLKPERL Senior Member Account #: 17918 Join Date: Mar 2001 Posts: 5,493	Thanks __________________ 2001 B5 A4 1.8TQMS CH Ecu Performance: APR Stage 3+, APR FMIC, Carbonio Intake, APR Exhaust, Cryo Southbend SS w/Unorthodox flywheel, Autospeed DTS, Forge BPV, SPAL EFK w/180 degree thermostat, S4 engine mounts, S4 fender liners Suspension: Vogtland Coilovers,H-sports, CPP Rear sway bar links Brakes: Stoptech 332mm,S4 rear brakes, Ferodo DS2500 all around Exterior: Reiger RS4 bumper (summer),S4 bumper(winter),S4 skirts,S4 rear, Tint: 35% front, 20% rear Street: 18" Silver OZ SLs,225/40 Kumho SPT Winter: 17" Flik Lex, 225/45 Dunlop Wintersport 3D Interior: S4 Silver Beltline trim,Landspeed Aluminum Shifter Plate,UUC Rob Knob w/Custom insert,Tycoon Alcantara Shift boot,LLTEK M&S mats,Beetle Sunglass holder, Valentine 1 hardwired w/LI-S4 display, Awe-Tuning pedals Sounds: RNS-E Navplus, Phatnoise Phatbox My Dyno Chart: 295 whp 277lbs My Compression & Leadown tests B5 1/4 mile database B6 1/4 mile database B7 1/4 mile database B7 Carbonio Intake Log Vag Com Data Log Vag Com Tech Section Edy Jun's FAQ

04-05-2006, 11:11 AM	#6
mAd1(gt3071r) Member Account #: 57175 Join Date: Jun 2003 Posts: 3,640	Valve failure?

04-05-2006, 11:14 AM	#7
wolfpack5 New Member Account #: 105896 Join Date: Mar 2006 Posts: 89	30% leakdown is too much I think the limit is closer to 15% (BMW anyway). Your numbers look good, tho. __________________ wolfpack5 2000 A4 Quattro 1.8T 97,100 miles

04-05-2006, 11:22 AM	#8
Kris Hansen Chief of Goat control Account #: 20 Join Date: Oct 2000 Posts: 66,548,190	Sure they do! If all cylinders are high, and close to each other, you are sure that the engine ... seals internally well. it's when you have 2 or 3 relly good, and the rest not so good that you start doing leakdown tests on the bad holes.

04-05-2006, 11:22 AM	#9
BSCA4 Senior Member Account #: 34916 Join Date: Mar 2002 Posts: 6,793	Actually, leak down #s is more important than compression #s IIRC __________________ Cheer, Ryan 1.8TM traded!!! Future 1.8TAQMS (I WILL BE BACK)

04-05-2006, 11:30 AM	#10
Kris Hansen Chief of Goat control Account #: 20 Join Date: Oct 2000 Posts: 66,548,190	not really.... They are just different. A compression test is easier to run... A leakdown test can help you pinpoint a more severe problem. While a compression test is a dynamic test (engine moving), a cylinder leakdown test (C.L.T.) is a static test (engine at rest). The compression test measures how much pressure the engine can produce while cranking; in contrast to the C.L.T., which measures how much pressure is lost in the engine. In a C.L.T. the engine is placed on TDC of the cylinder in question and using a similar type of connector as the compression test, we fill the cylinder with pressure. The tester then measures the volume of air needed to maintain a predetermined pressure in the cylinder. This reading is expressed in a percentage. Good cylinder leakdown readings should be below 5-8%. The great thing about C.L.T. is that it deals with how well the cylinder is sealing and nothing else. The readings are not affected by carbon deposits, cam timing, or even engine cranking speed. Another great feature of the C.L.T. is the fact that you can hear where the air is leaking out of the cylinder. When a cylinder has high percentage of leakage, first check the oil filler cap. Do you hear a hissing sound? If so, you may have pressure leaking by the rings. Is there air escaping out the exhaust? Is it escaping out the intake system? Then a burned valve may be the problem. If two adjoining cylinders have similar low readings and you hear leakage out the other cylinder, then a failed head gasket may be the problem. Being able to pinpoint the exact source of the compression loss will tell you where the problem is; and not just that you have one. This knowledge will greatly assist you in the next step... the repair. source

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