Leak Down Test Percentages

jnaut · 04-22-2011, 07:13 PM

I have researched but came up with nothing, does anybody know factory nissan spec on leak down percentage? Thanks for your help jason.

SPOHN · 04-22-2011, 08:17 PM

I know on the 350 it was 20% or less was considered within spec. But 20% is on the high side IMO. I recall this from my FI install. For this matters on a OEM block. Make sure whoever does this uses a good quality tool for this job for it is well know to get erratic results if not done properly. But a dealer should be able to let you know the specs from the service manual.

Mike · 04-22-2011, 08:32 PM

I know with my 350Z I had 35-50 and they replaced my engine.

jnaut · 04-22-2011, 08:38 PM

from what i have found 10 - 20 is good and 20 -30 is meh and after 30 is game over for the engine

04-22-2011, 07:13 PM	#1 (permalink)
jnaut A True Z Fanatic Join Date: Dec 2009 Location: wpb, fl Posts: 1,146 Drives: 09 370z Rep Power: 17	Leak Down Test Percentages I have researched but came up with nothing, does anybody know factory nissan spec on leak down percentage? Thanks for your help jason. __________________ Best 1/4 mile 12.24 Best mph 114.5_______

04-22-2011, 08:17 PM	#2 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 45 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	I know on the 350 it was 20% or less was considered within spec. But 20% is on the high side IMO. I recall this from my FI install. For this matters on a OEM block. Make sure whoever does this uses a good quality tool for this job for it is well know to get erratic results if not done properly. But a dealer should be able to let you know the specs from the service manual. __________________

04-22-2011, 08:32 PM	#3 (permalink)
Mike The370Z.com Sponsor Join Date: Jun 2009 Location: Loganville, GA Posts: 5,944 Drives: 370z Rep Power: 2185	I know with my 350Z I had 35-50 and they replaced my engine. __________________ NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z Porsche: 93 968 / 23 Macan GTS / 93 968

04-22-2011, 08:38 PM	#4 (permalink)
jnaut A True Z Fanatic Join Date: Dec 2009 Location: wpb, fl Posts: 1,146 Drives: 09 370z Rep Power: 17	from what i have found 10 - 20 is good and 20 -30 is meh and after 30 is game over for the engine __________________ Best 1/4 mile 12.24 Best mph 114.5_______

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