Need some figures, people!
02-01-2002, 11:20 PM
#1
SSU Moderator
Thread Starter
Join Date: Nov 2001
Location: Austin, TX
Posts: 4,857
Likes: 0
Received 0 Likes
on
0 Posts
Need some figures, people! Ok, what I want to do is to be able to calculate maximum rod length when given a compression height, deck height, and stroke. I was under the impression that the deck height for the LS1 is 9.24" and the LS1 puts the piston out of the hole .006". Here's where it gets sticky... Lunati's 382 stroker kit: they list a 4" stroke, 6.125" rod, and 1.13" compression height for their pistons. Doing the math I picked up from Joseph that doesnt add up. [DeckHeight - (Stroke/2 + Rod) + .006)] Right there I get 1.121 for the comp. height, NOT 1.13. So either I'm wrong on math somewhere or the deck height is 9.249".
Joseph's comments in an old thread: [quote]First you want to divide the stroke in half, so that you can measure from the centerline of the crankshaft bore.
3.9" stroke /2 = 1.95"
Use the actual rod length 6.125"
Now add these 2 numbers together = 8.075"
Take the results of adding these together and now you subtract the block deck height 9.24" - 8.075" = 1.165"
1.165" of compression height on a piston would give you close to zero deck, meaning the piston would be flat with the cylinder head surface at top dead center, assuming a true block.
Stock LS1 engines have the piston out of the cylinder .006-.007" out of each cylinder, so to duplicate that with compression height just add the .006" to the 1.165" that we came up with earlier.<hr></blockquote>
Ok, to check my math, I'd like to get some stock LS1 numbers since I think Lunati may push the piston out .015 from the deck height. I know the stroke is 3.622 and the rod is 6.098. Whats the compression height? ANY info would help....and I'd LOVE some sponsor support here. Im probably doing ALL this wrong. <img src="images/icons/rolleyes.gif" border="0">
Ryan
[ February 02, 2002: Message edited by: The Underdog ]</p>
Joseph's comments in an old thread: [quote]First you want to divide the stroke in half, so that you can measure from the centerline of the crankshaft bore.
3.9" stroke /2 = 1.95"
Use the actual rod length 6.125"
Now add these 2 numbers together = 8.075"
Take the results of adding these together and now you subtract the block deck height 9.24" - 8.075" = 1.165"
1.165" of compression height on a piston would give you close to zero deck, meaning the piston would be flat with the cylinder head surface at top dead center, assuming a true block.
Stock LS1 engines have the piston out of the cylinder .006-.007" out of each cylinder, so to duplicate that with compression height just add the .006" to the 1.165" that we came up with earlier.<hr></blockquote>
Ok, to check my math, I'd like to get some stock LS1 numbers since I think Lunati may push the piston out .015 from the deck height. I know the stroke is 3.622 and the rod is 6.098. Whats the compression height? ANY info would help....and I'd LOVE some sponsor support here. Im probably doing ALL this wrong. <img src="images/icons/rolleyes.gif" border="0">
Ryan
[ February 02, 2002: Message edited by: The Underdog ]</p>
02-02-2002, 08:44 AM
#2
TECH Addict
Join Date: Nov 2001
Location: Nawf Carolina
Posts: 2,556
Likes: 0
Received 0 Likes
on
0 Posts
Re: Need some figures, people! Hey there Ryan <img src="gr_stretch.gif" border="0">
Stock LS1
Stroke: 3.62
Rod: 6.098
Compression Height: 1.338
That makes a stack 9.246" tall, deck height is 9.24 which throws the pistons up .006"
J.
Stock LS1
Stroke: 3.62
Rod: 6.098
Compression Height: 1.338
That makes a stack 9.246" tall, deck height is 9.24 which throws the pistons up .006"
J.
02-02-2002, 09:00 AM
#3
SSU Moderator
Thread Starter
Join Date: Nov 2001
Location: Austin, TX
Posts: 4,857
Likes: 0
Received 0 Likes
on
0 Posts
Re: Need some figures, people! ok, so we've figured out that Lunati pushes the piston a total of .015" out of the block (additional .008-.009" past the stock .006"). Can anyone with one or that has built on confirm?
Ryan
Ryan
