Leakdown Testers

SGSST109E · 11-25-2021, 08:18 AM

HAd a Moroso 89600 for 50 years it finally started to read high. Bought a OTC 5609 two guage unit. Its accurate and repeatable.

jmcarter · 11-25-2021, 10:51 AM

Quote:

Originally Posted by SGSST109E

HAd a Moroso 89600 for 50 years it finally started to read high. Bought a OTC 5609 two guage unit. Its accurate and repeatable.

Only $74 on Amazon right now (with Prime membership anyway) and looks to be made in USA unless I’m missing something.

340Cuda · 11-25-2021, 11:36 AM

I have the OTC tester also and it seems to work well.

mschafer · 11-26-2021, 10:37 AM

I have a OTC also ,works well and would recommend it.

Dave Bergfeldt · 11-28-2021, 06:12 PM

Do Not .... I repeat Do Not get the Harbor Freight unit ... Difficult to use ... inaccurate numbers!!!!

sst5167 · 11-29-2021, 09:13 AM

I bought mine off a Cornwell truck quite a few years ago. I use mine after every race on both car as part of my routine maintenance, and it's been perfect. I would buy another one if I needed too.

reknapp52 · 12-12-2021, 04:27 PM

Turns out my brother has a Matco tester that I will be using. Do I need to warm the motor before running the test? It's been parked in my garage for about 3 weeks without being started. Also, what numbers are acceptable? My motor is 447 C.I. with 14.3 compression.

garyc · 01-31-2022, 02:49 PM

whats normal leak down on a new motor? does it matter what ring package?
thanks mike

garyc · 01-31-2022, 04:50 PM

most times leak down was used to find a dead cylinder

FED 387 · 01-31-2022, 06:29 PM

definitely less than 10% and if you have gapless end rings less than 5%---if its a tight motor AND NEW never started you are going to see about 3-4 to maybe 5 - 6 %---watch for variations between the cylinder readings especially those cylinders that are next to each other-- not small ones like a few percent but big differences like 10-30%--FED 387

11-25-2021, 08:18 AM	#1
SGSST109E Member Join Date: Jun 2007 Location: NJ Posts: 351 Likes: 62 Liked 126 Times in 61 Posts	Re: Leakdown Testers HAd a Moroso 89600 for 50 years it finally started to read high. Bought a OTC 5609 two guage unit. Its accurate and repeatable.

11-25-2021, 11:36 AM	#3
340Cuda VIP Member Join Date: Apr 2003 Location: Tulsa, Oklahoma Posts: 1,676 Likes: 3,892 Liked 805 Times in 341 Posts	Re: Leakdown Testers I have the OTC tester also and it seems to work well.

11-26-2021, 10:37 AM	#4
mschafer Junior Member Join Date: Oct 2014 Posts: 44 Likes: 0 Liked 13 Times in 9 Posts	Re: Leakdown Testers I have a OTC also ,works well and would recommend it.

11-28-2021, 06:12 PM	#5
Dave Bergfeldt Junior Member Join Date: Jan 2010 Posts: 31 Likes: 33 Liked 8 Times in 6 Posts	Re: Leakdown Testers Do Not .... I repeat Do Not get the Harbor Freight unit ... Difficult to use ... inaccurate numbers!!!! __________________ Dave Bergfeldt 106 SST/SG

11-29-2021, 09:13 AM	#6
sst5167 Junior Member Join Date: Dec 2009 Posts: 52 Likes: 17 Liked 17 Times in 9 Posts	Re: Leakdown Testers I bought mine off a Cornwell truck quite a few years ago. I use mine after every race on both car as part of my routine maintenance, and it's been perfect. I would buy another one if I needed too.

12-12-2021, 04:27 PM	#7
reknapp52 Junior Member Join Date: Nov 2008 Location: Cascade, CO Posts: 48 Likes: 22 Liked 7 Times in 5 Posts	Re: Leakdown Testers Turns out my brother has a Matco tester that I will be using. Do I need to warm the motor before running the test? It's been parked in my garage for about 3 weeks without being started. Also, what numbers are acceptable? My motor is 447 C.I. with 14.3 compression.

01-31-2022, 02:49 PM	#8
garyc Member Join Date: Mar 2021 Posts: 124 Likes: 0 Liked 51 Times in 30 Posts	Re: Leakdown Testers whats normal leak down on a new motor? does it matter what ring package? thanks mike Last edited by garyc; 01-31-2022 at 04:49 PM. Reason: previous post

01-31-2022, 04:50 PM	#9
garyc Member Join Date: Mar 2021 Posts: 124 Likes: 0 Liked 51 Times in 30 Posts	Re: Leakdown Testers most times leak down was used to find a dead cylinder

01-31-2022, 06:29 PM	#10
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,423 Likes: 545 Liked 333 Times in 180 Posts	Re: Leakdown Testers definitely less than 10% and if you have gapless end rings less than 5%---if its a tight motor AND NEW never started you are going to see about 3-4 to maybe 5 - 6 %---watch for variations between the cylinder readings especially those cylinders that are next to each other-- not small ones like a few percent but big differences like 10-30%--FED 387