Generation III Internal Engine 1997-2006 LS1 | LS6

Sponsored by:

CR on lq9 ?

Reply Subscribe

Search this Thread

Old

Dec 31, 2008 | 12:32 AM

#1

Thread Starter

On The Tree

Joined: Apr 2007

Posts: 132

Likes: 0

From: germantown, maryland

Default

CR on lq9 ?

does anyone know what the cr is on a totally stock lq9 with stock 241 heads on it?

Old

Dec 31, 2008 | 03:06 AM

#2

TECH Addict

iTrader: (11)

Joined: Jun 2003

Posts: 2,215

Likes: 19

From: Arlington, Tx

Default

Old

Dec 31, 2008 | 02:33 PM

#3

Thread Starter

On The Tree

Joined: Apr 2007

Posts: 132

Likes: 0

From: germantown, maryland

Default

10.70 lower then i thought

Old

Dec 31, 2008 | 03:48 PM

#4

Staging Lane

iTrader: (42)

Joined: Jan 2002

Posts: 85

Likes: 0

From: Mechanicsville,Va

Default

Quote:

Originally Posted by 405HP_Z06

Not to steal this thread. Since you have a nice calculator.. How about a
LQ4 with 59cc heads. Think the dish in a LQ4 piston is -6cc. Stock gasket.

Thanks

Old

Dec 31, 2008 | 03:55 PM

#5

TECH Senior Member

iTrader: (23)

Joined: Jul 2004

Posts: 9,853

Likes: 0

From: Houston, TX

Default

How about an LQ9 with stock gasket and 243 heads?

Old

Dec 31, 2008 | 04:19 PM

#6

TECH Enthusiast

iTrader: (28)

Joined: Apr 2008

Posts: 591

Likes: 0

From: Grayson, KY 41143

Default

here is everyone a calculator..

http://web.tampabay.rr.com/1bking/ch....htm#calc_comp

Old

Dec 31, 2008 | 05:28 PM

#7

TECH Addict

iTrader: (11)

Joined: Jun 2003

Posts: 2,215

Likes: 19

From: Arlington, Tx

Default

Quote:

Originally Posted by WYATT318MOPAR

here is everyone a calculator..

http://web.tampabay.rr.com/1bking/ch....htm#calc_comp

This calculator, like most, doesn't account for piston top OD and ring depth. It also makes an assumption on head gasket bore diameter that's incorrect. Close but no cigar.

Last edited by 405HP_Z06; Dec 31, 2008 at 07:34 PM.

Trending Topics

Let's Talk Detailing (Products, Methods)

15

319
Degree Wheel or Dot to Dot?

16

357
Working on an Engine Simulator

20

452
LQ9 Stage 3 sloppy cam kit

10

217
Recommend valve spring compressor for 400+ lb spring

7

201

Old

Dec 31, 2008 | 05:42 PM

#8

On The Tree

iTrader: (18)

Joined: Jan 2006

Posts: 175

Likes: 0

From: Wetumpka, AL

Default

Quote:

Originally Posted by 405HP_Z06

This calculator, like most, doesn't account for piston top OD and ring depth. Close but no cigar.

So where is your calculator

Old

Dec 31, 2008 | 05:43 PM

#9

TECH Addict

iTrader: (11)

Joined: Jun 2003

Posts: 2,215

Likes: 19

From: Arlington, Tx

Default

Quote:

Originally Posted by STOCK12SECZ

Not to steal this thread. Since you have a nice calculator.. How about a
LQ4 with 59cc heads. Think the dish in a LQ4 piston is -6cc. Stock gasket.

Thanks

Old

Dec 31, 2008 | 05:44 PM

#10

TECH Addict

iTrader: (11)

Joined: Jun 2003

Posts: 2,215

Likes: 19

From: Arlington, Tx

Default

Quote:

Originally Posted by GMCtrk

How about an LQ9 with stock gasket and 243 heads?

Old

Dec 31, 2008 | 05:46 PM

#11

TECH Addict

iTrader: (11)

Joined: Jun 2003

Posts: 2,215

Likes: 19

From: Arlington, Tx

Default

Quote:

Originally Posted by zx9rgreen

So where is your calculator

On my computer, you can purchase the program from Performance Trends. It's called Compression Ratio Calculator.

Old

Dec 31, 2008 | 06:31 PM

#12

Thread Starter

On The Tree

Joined: Apr 2007

Posts: 132

Likes: 0

From: germantown, maryland

Default

now the question is that bump in cr worth more then like 5 horsepower

Old

Dec 31, 2008 | 06:46 PM

#13

TECH Addict

iTrader: (14)

Joined: May 2005

Posts: 2,727

Likes: 0

From: Simi Valley, CA.

Default

I got 10.9:1 for the LQ9 guy on the free calculator, but i guess that little bit can make the difference on a built race motor.

Old

Dec 31, 2008 | 07:36 PM

#14

TECH Addict

iTrader: (11)

Joined: Jun 2003

Posts: 2,215

Likes: 19

From: Arlington, Tx

Default

Quote:

Originally Posted by djsanchez2

I got 10.9:1 for the LQ9 guy on the free calculator, but i guess that little bit can make the difference on a built race motor.

If accuracy isn't a concern than why even calculate it? There is only one correct way to calculate compression ratio and as long as the parameters are correct one can't argue with the math.

Old

Dec 31, 2008 | 08:29 PM

#15

Staging Lane

iTrader: (42)

Joined: Jan 2002

Posts: 85

Likes: 0

From: Mechanicsville,Va

Default

Quote:

Originally Posted by 405HP_Z06

Much appreciated!

Old

Dec 31, 2008 | 11:08 PM

#16

TECH Addict

iTrader: (11)

Joined: Jun 2003

Posts: 2,215

Likes: 19

From: Arlington, Tx

Default

Quote:

Originally Posted by pewter02z28gs

now the question is that bump in cr worth more then like 5 horsepower

If your going to swap heads, at least use some 243's.

Old

Dec 31, 2008 | 11:19 PM

#17

TECH Senior Member

iTrader: (23)

Joined: Jul 2004

Posts: 9,853

Likes: 0

From: Houston, TX

Default

so it looks like I'll be sitting at right at 11:1. That should give me a nice gain coming from 10.1:1

Old

Dec 31, 2008 | 11:30 PM

#18

Banned

iTrader: (88)

Joined: Mar 2006

Posts: 21,019

Likes: 891

From: The Beach...

Default

Stock 241's on a LQ9 is going to suck ballz..

Old

Jan 1, 2009 | 12:03 AM

#19

TECH Senior Member

iTrader: (23)

Joined: Jul 2004

Posts: 9,853

Likes: 0

From: Houston, TX

Default

Quote:

Originally Posted by the_merv

Stock 241's on a LQ9 is going to suck ballz..

Yep.

I'm personally debating picking up some 241s dirt cheap and having them ported. 11:1 may be too much compression for me. The 67cc 241s would be more friendly

Old

Jan 1, 2009 | 12:19 AM

#20

Banned

iTrader: (88)

Joined: Mar 2006

Posts: 21,019

Likes: 891

From: The Beach...

Default

Go with L92's..

First
Prev
1 / 2
Next
Last

All times are GMT -5. The time now is 10:00 AM.