Compression check-up - ZR-1 Net Registry Forums

We Gone · 10-31-2019

Was changing plugs last changed around 2008... Plugs NGK BKR7EIX gap .050

At that time I also did a compression check stock catback Marc' prom
engine temp 195
2- 230 4- 225 6- 228 8- 225
1- 230 3- 226 5- 230 7- 228

Fast forward today 2019 Marc's 510hp package done 12/2013
Cold engine Going back tp AC 41-602
2- 238 4- 238 6- 240 8- 240
1- 232 3- 233 4- 232 7- 234

BLM Left bank 136
BLM right bank 132
Int-L 127
Int R 128
Map Volts 1.33-139
TP Sensor 0.53v
02 R & L 83-890

I have a vid from the scanner readings but can't post here

Jagdpanzer · 10-31-2019

Nice numbers,
How many miles in the meantime?

Sent from my iPhone using ZR-1 Net Registry

We Gone · 10-31-2019

45k in 2008, 53k in 2013 when I took it to Marc, Just turned 62K.

The increase in compression was due to the MLS head gaskets that Marc used.

"The compressed thickness of the MLS gasket is .050" verses .065" for the OE gasket. For a 350 ci engine, the MLS gasket will add .4 to the compression ratio. If the original compression was 11.0:1 it will increase to 11.4:1"

10-31-2019	#1
We Gone Join Date: Apr 2004 Location: ATL. GA. Posts: 2,170	Compression check-up Was changing plugs last changed around 2008... Plugs NGK BKR7EIX gap .050 At that time I also did a compression check stock catback Marc' prom engine temp 195 2- 230 4- 225 6- 228 8- 225 1- 230 3- 226 5- 230 7- 228 Fast forward today 2019 Marc's 510hp package done 12/2013 Cold engine Going back tp AC 41-602 2- 238 4- 238 6- 240 8- 240 1- 232 3- 233 4- 232 7- 234 BLM Left bank 136 BLM right bank 132 Int-L 127 Int R 128 Map Volts 1.33-139 TP Sensor 0.53v 02 R & L 83-890 I have a vid from the scanner readings but can't post here __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold Last edited by We Gone; 10-31-2019 at 01:49 PM.

10-31-2019	#2
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,657	Re: Compression check-up Nice numbers, How many miles in the meantime? Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

10-31-2019	#3
We Gone Join Date: Apr 2004 Location: ATL. GA. Posts: 2,170	Re: Compression check-up 45k in 2008, 53k in 2013 when I took it to Marc, Just turned 62K. The increase in compression was due to the MLS head gaskets that Marc used. "The compressed thickness of the MLS gasket is .050" verses .065" for the OE gasket. For a 350 ci engine, the MLS gasket will add .4 to the compression ratio. If the original compression was 11.0:1 it will increase to 11.4:1" __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold