Piston rock @ BDC in LSx OEM 6 liter iron block 4 inch strokers?? - LS1TECH

Log In 


Generation IV Internal Engine 2005-2014 LS2 | LS3 | LS7 | L92 | LS9
Sponsored by:
Sponsored by:

Piston rock @ BDC in LSx OEM 6 liter iron block 4 inch strokers??

Reply
 
Thread Tools Search this Thread
Old 04-28-2012, 05:38 PM   #1
Staging Lane
Thread Starter
 
Join Date: Sep 2007
Location: Brooklyn, NY
Posts: 80
Default Piston rock @ BDC in LSx OEM 6 liter iron block 4 inch strokers??

I want to build a 415 ci stroker out of a LSx 6 liter OEM iron block e.g. LQ4/9 or LY6, because the iron blocks are more plentiful, wicked cheap and are stronger than the aluminum LS blocks. But I have been told to be concerned about the piston rock at both BDC and TDC. Especially BDC because with the 4 inch stroke most pistons are pulled so far out of the cylinder sleeve with iron blocks which have a shorter sleeve than their aluminum block counterparts and also a shorter deck.

Who makes is best 4 inch crank rotating assembly combo for a LQ4/9 based stroker?? Or even the LY6 based stroker??

How much shorter are cylinder sleeves on the Gen III/IV iron blocks as compared to the LS2 or LS3/L92 blocks??

Can the "piston rock problem" be gotten rid of or avoided altogether with the right 4 inch crank rotating assembly combo??

This is for a daily driven '95 Caprice 9C1 with occasional autocrossing and road racing.

Thanx for your advice in advance!

Last edited by B'klyn9C1; 04-28-2012 at 09:13 PM.
B'klyn9C1 is offline   Reply With Quote
Old 04-28-2012, 09:44 PM   #2
12 Second Club
iTrader: (20)
 
litle88's Avatar
 
Join Date: Jan 2007
Location: Burbank, Illinois
Posts: 2,548
Default

Just call a sponsor ----->
Get a combo within your budget that will meet the way your going to run it NA OR FI and they'll get you the right piston. Piston design has come along way. Just my .2
litle88 is offline   Reply With Quote
Old 04-29-2012, 12:46 AM   #3
TECH Apprentice
 
Join Date: May 2009
Posts: 300
Default

all lsx being aluminum or iron have the same deck height unless its a tall deck lsx from gmpp
fastazzls1 is offline   Reply With Quote
Old 04-29-2012, 09:58 AM   #4
KCS
Moderator
iTrader: (19)
 
KCS's Avatar
 
Join Date: Mar 2005
Location: The Woodlands, TX
Posts: 6,363
Default

Quote:
Originally Posted by B'klyn9C1 View Post
I want to build a 415 ci stroker out of a LSx 6 liter OEM iron block e.g. LQ4/9 or LY6, because the iron blocks are more plentiful, wicked cheap and are stronger than the aluminum LS blocks. But I have been told to be concerned about the piston rock at both BDC and TDC. Especially BDC because with the 4 inch stroke most pistons are pulled so far out of the cylinder sleeve with iron blocks which have a shorter sleeve than their aluminum block counterparts and also a shorter deck.

Who makes is best 4 inch crank rotating assembly combo for a LQ4/9 based stroker?? Or even the LY6 based stroker??

How much shorter are cylinder sleeves on the Gen III/IV iron blocks as compared to the LS2 or LS3/L92 blocks??

Can the "piston rock problem" be gotten rid of or avoided altogether with the right 4 inch crank rotating assembly combo??

This is for a daily driven '95 Caprice 9C1 with occasional autocrossing and road racing.

Thanx for your advice in advance!
BDC piston rock with 4" strokes are no longer a problem in even the iron LQ4/9 engines. They were nearly a decade ago, but the piston manufacturers have long since realized the solution and rectified the problem in the piston design. Now, 4.125" stroke cranks are going into the iron blocks pretty regularly, and even 4.250" strokes are going into standard deck height sleeved blocks, however these are not exactly off the shelf kits.
KCS is online now   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Is the LQ4/9 sleeved? Freefallin Generation III Internal Engine 11 08-12-2014 05:53 PM
Anyone has a 417 ci LSx stroker out of a OEM 6 liter iron block(LQ9 or LY6)?? B'klyn9C1 Generation IV Internal Engine 5 06-21-2012 01:00 PM
Why not more 6.200" con rods for LSx strokers? B'klyn9C1 Generation IV Internal Engine 4 10-25-2011 10:50 PM
SLP "ZL402" LS1 and LS2 short block assemblies on sale! tbyrne Generation IV Internal Engine 6 10-23-2005 10:22 AM
402ci, 408ci, and rocking pistons Bryan Wilkinson Generation III Internal Engine 8 09-05-2005 04:50 PM


Tags
40, 415, 9c1, autocross, bdc, block, build, caprice, issues, ls, ls1tech, ls2, lsx, problems, stroke, stroker, strongest, wheel

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -5. The time now is 07:21 AM.