#1 Staging Lane
Join Date: Sep 2008
Location: Currently, Zormat, Afghanistan....Home staion, FT. Richardson, Alaska
Posts: 76
LQ9 or LQ4 What is the difference between the two? Which Is better? I tried the search but no dice.
#2 TECH Resident
Join Date: Mar 2007
Location: Slidell,LA
Posts: 804
The biggest difference is the compression ratio lq4 is lower than the lq9. Someone will chime in on what they are since I have forgotten what they are. I think the lq4 is 9.3 or something close to that.
#3 On The Tree
1984 Pontaic Fiero My Garage
Join Date: Mar 2009
Location: Smithfield, UT
Posts: 104
According to Will Handzel, the main difference is pistons. LQ9 got coated skirts and 10.1:1 flat-tops versus the LQ4 at 9.4:1 circular-dish, uncoated.
#4 On The Tree
Join Date: Feb 2009
Location: Puyallup
Posts: 167
^ Werd. Thats what Ive heard.
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#5 Staging Lane
Join Date: Sep 2008
Location: Currently, Zormat, Afghanistan....Home staion, FT. Richardson, Alaska
Posts: 76
so both blocks rods cranks are the same? minus the 99-00 lq4 cranks which wont bolt to the t56 and 4l60?
#6 Staging Lane
Join Date: May 2008
Location: kansas
Posts: 66
the crank reluctor wheel are different... lq4 has a 24x and the lq9 has a 58x
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#7 Staging Lane
Join Date: Sep 2008
Location: Currently, Zormat, Afghanistan....Home staion, FT. Richardson, Alaska
Posts: 76
So who here has a stock bottom 6.0 or l92 in their f body?
#8 12 Second Club
Join Date: Jan 2009
Posts: 231
the only diffrence is the heads the lq4 has lower compression and the lq9 has higher compression but its the same block
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#9 TECH Junkie
Join Date: Jun 2004
Location: Murrieta, CA
Posts: 3,080
Quote:
Originally Posted by
1bdtrk So who here has a stock bottom 6.0 or l92 in their f body?
I do...
basically the differences have been mentioned already...
the LQ4 pistons are dished for lower compression... ideal for boosted applications
the LQ9 are flat topped... better for NA cars
both are iron blocks
in my case i have an LQ4, but I milled my heads to raise my compression back up.
#10 12 Second Club
Join Date: Jan 2009
Posts: 231
Quote:
Originally Posted by
Soul TKR I do...
did u like ur 6.0 better than ur ls1 motor?
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#11 Staging Lane
Join Date: Sep 2008
Location: Currently, Zormat, Afghanistan....Home staion, FT. Richardson, Alaska
Posts: 76
Quote:
Originally Posted by
Soul TKR I do...
what H/C/I combo you using? hp/tq? You like it better?
#12 TECH Apprentice
Join Date: Sep 2008
Location: Joplin, MO
Posts: 304
So a 2002 LQ9 will mate with a T56? And what crank would you need to buy to go back to the 24x reluctor? Will any aftermarket cranks work?
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#13 TECH Apprentice
Join Date: Sep 2008
Location: Joplin, MO
Posts: 304
And what heads could you bolt onto one of these? Could you bolt LS3 or LS7 heads onto a LQ9?
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#14 TECH Veteran
Join Date: Sep 2005
Location: Houston,TX
Posts: 4,050
Quote:
Originally Posted by
99LS6SS So a 2002 LQ9 will mate with a T56? And what crank would you need to buy to go back to the 24x reluctor? Will any aftermarket cranks work?
lq9 24x as well. ive come across a few lq9 and none had 58x.
all 24x. there may be some 06+ that may have 58x.
#15 TECH Veteran
Join Date: Sep 2005
Location: Houston,TX
Posts: 4,050
Quote:
Originally Posted by
99LS6SS And what heads could you bolt onto one of these? Could you bolt LS3 or LS7 heads onto a LQ9?
negative on ls7, ls3/l92 will work
#16 TECH Apprentice
Join Date: Sep 2008
Location: Joplin, MO
Posts: 304
Why won't the LS7's work? Sorry these might seem like dumb questions but I've never delt with an LS7
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#17 Teching In
Join Date: Sep 2007
Location: Albuquerque, NM
Posts: 30
Quote:
Originally Posted by
99LS6SS Why won't the LS7's work? Sorry these might seem like dumb questions but I've never delt with an LS7
The LS7 changed the degree of the heads as compared with the other LS motors. I dont remember the exact angle but that is why.
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#18 TECH Junkie
Join Date: Jun 2004
Location: Murrieta, CA
Posts: 3,080
Quote:
Originally Posted by
ssick1 did u like ur 6.0 better than ur ls1 motor?
no contest... I LOVE the 6.0, there's no reason not to lol
the bigger engine helps raise that TQ curve throughout more of the rpm range...
Quote:
Originally Posted by
1bdtrk what H/C/I combo you using? hp/tq? You like it better?
My mods are in my sig and on my sig pic... I like it MUCH better... really powerful!
Tags 60 , afghanistan , buy , compression , crank , difference , differences , engine , houston , lq4 , lq9 , raise , reluctor , wheel , zormat
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LQ9 or LQ4 
