Compression Estimates
#1
On The Tree
Thread Starter
iTrader: (2)
Join Date: May 2008
Location: Arizona
Posts: 132
Likes: 0
Received 0 Likes
on
0 Posts
Compression Estimates
I currently have an LQ4 factory shortblock with 243 heads on it. I was offered a good deal on a factory LQ9 shortblock. What would my resulting compression be with an LQ9 and 243 heads, and would it be too high for pump gas? Thanks
#3
TECH Addict
iTrader: (10)
Join Date: Nov 2005
Location: Memphrica Tn
Posts: 2,077
Likes: 0
Received 0 Likes
on
0 Posts
What he said.. It should be right at 11to one if you use a stock headgasket. And will be fine with 91or 93 octane I have heard ppl say over 11.5 to one is where you start running into problems on pump gas but no real experience there.
#4
TECH Resident
iTrader: (2)
Join Date: Sep 2010
Location: Salisbury, NC
Posts: 909
Likes: 0
Received 0 Likes
on
0 Posts
10.2:1 is where it starts on a non computer controlled locked out timing engine with iron heads. these LS motors are a thing of beauty between the computer controlled timing the aluminum heads and chevy magic they can get up to about 11.5 sometimes 12:1 static with a big cam before you have the first issue. sounds like a cool build, good luck