What is our stock cc volume?
Re: What is our stock cc volume? John,
I believe Wizkid posted stock chanber cc to be 67.3.
Most ported heads are milled 0.030.
I have read that 60cc is around 11 to 1 CR and
63-64cc is @ 10.6 to 1.
Try doing a search. Someone I'm sure has an excel spreadsheet for calc. chamber volume vs. CR.
If you are planning on going with some boost, you may want to try a set of 6.0L truck heads. They have larger chambers than the stock 5.7 heads and would drop you CR some to allow for more safe boost.
I hope this helps some.
Brandon
I believe Wizkid posted stock chanber cc to be 67.3.
Most ported heads are milled 0.030.
I have read that 60cc is around 11 to 1 CR and
63-64cc is @ 10.6 to 1.
Try doing a search. Someone I'm sure has an excel spreadsheet for calc. chamber volume vs. CR.
If you are planning on going with some boost, you may want to try a set of 6.0L truck heads. They have larger chambers than the stock 5.7 heads and would drop you CR some to allow for more safe boost.
I hope this helps some.
Brandon
Re: What is our stock cc volume? Playdough,
The 6.0L heads are supposed to bolt right on to the LS1 block. That's the general consensus. I sure hope so since I have a set sitting in my garage.
The 6.0L heads have revised ports (better flowing) and larger chambers than the 5.7s.
Do a search for "6.0L" or "truck heads". There is a lot of info on the boards.
John,
I would assume your heads are in the low 60cc range, if they milled them 0.030 in.
The 6.0L heads are supposed to bolt right on to the LS1 block. That's the general consensus. I sure hope so since I have a set sitting in my garage.
The 6.0L heads have revised ports (better flowing) and larger chambers than the 5.7s.
Do a search for "6.0L" or "truck heads". There is a lot of info on the boards.
John,
I would assume your heads are in the low 60cc range, if they milled them 0.030 in.
Launching!
Joined: Nov 2001
Posts: 236
Likes: 0
From: Memphis, TN
Re: What is our stock cc volume? [quote]Originally posted by Speed Demon:
<strong>John,
I believe Wizkid posted stock chanber cc to be 67.3.
Most ported heads are milled 0.030.
I have read that 60cc is around 11 to 1 CR and
63-64cc is @ 10.6 to 1.
Try doing a search. Someone I'm sure has an excel spreadsheet for calc. chamber volume vs. CR.
If you are planning on going with some boost, you may want to try a set of 6.0L truck heads. They have larger chambers than the stock 5.7 heads and would drop you CR some to allow for more safe boost.
I hope this helps some.
Brandon</strong><hr></blockquote>
To calculate *New* compression ratio from a changed combusion chamber size:
(for STOCK LS1 displacement)
1 - add 10.484 to the cyl head comb. chamber size
2 - add 708.3096 to the number from step 1
3 - divide the number from 2, by the number in 1
example:
60 cc cylinder heads
step 1: 60 + 10.484 = 70.484
step 2: 708.3096 + 70.484 = 778.7936
step 3: 778.7936 / 70.484 = 11.05
(for 382 displacement)
same steps, use 782.4823 instead of 708.3096
Remember, this is all static compression, depending on the cam you choose, your dynamic compression can vary significantly.
-brian
(note, this is based off a 67.4 cc stock chamber only. For another head size (ie, 67.3), just subtract it from 77.8835 to get the addition number in step 1. Example, 77.8835-67.3=10.58)
[ December 06, 2001: Message edited by: horsepower ]</p>
<strong>John,
I believe Wizkid posted stock chanber cc to be 67.3.
Most ported heads are milled 0.030.
I have read that 60cc is around 11 to 1 CR and
63-64cc is @ 10.6 to 1.
Try doing a search. Someone I'm sure has an excel spreadsheet for calc. chamber volume vs. CR.
If you are planning on going with some boost, you may want to try a set of 6.0L truck heads. They have larger chambers than the stock 5.7 heads and would drop you CR some to allow for more safe boost.
I hope this helps some.
Brandon</strong><hr></blockquote>
To calculate *New* compression ratio from a changed combusion chamber size:
(for STOCK LS1 displacement)
1 - add 10.484 to the cyl head comb. chamber size
2 - add 708.3096 to the number from step 1
3 - divide the number from 2, by the number in 1
example:
60 cc cylinder heads
step 1: 60 + 10.484 = 70.484
step 2: 708.3096 + 70.484 = 778.7936
step 3: 778.7936 / 70.484 = 11.05
(for 382 displacement)
same steps, use 782.4823 instead of 708.3096
Remember, this is all static compression, depending on the cam you choose, your dynamic compression can vary significantly.
-brian
(note, this is based off a 67.4 cc stock chamber only. For another head size (ie, 67.3), just subtract it from 77.8835 to get the addition number in step 1. Example, 77.8835-67.3=10.58)
[ December 06, 2001: Message edited by: horsepower ]</p>
Re: What is our stock cc volume? Considering everything is stock but the combustion chamber volume.
Combustion Chamber Volume (cc)-- Static Compression Ratio
60 11 :1
61 10.9 :1
62 10.75 :1
63 10.6 :1
64 10.5 :1
65 10.4 :1
66 10.25 :1
67.3 10.1 :1
ERic
Combustion Chamber Volume (cc)-- Static Compression Ratio
60 11 :1
61 10.9 :1
62 10.75 :1
63 10.6 :1
64 10.5 :1
65 10.4 :1
66 10.25 :1
67.3 10.1 :1
ERic
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Re: What is our stock cc volume? [quote]Originally posted by horsepower:
<strong>
60 cc cylinder heads
60 + 2.72966 = 62.72966
708.3096 / 62.72966 = 11.29 or 11.29:1 compression ratio
[ December 06, 2001: Message edited by: horsepower ]</strong><hr></blockquote>
I get 11.03:1 for 60cc combustion chambers.
I have a spreadsheet I have written to calculate this easily. I am working on an article and will release the spread sheet with it. I might release the spread sheet a little earlier.
Eric
<strong>
60 cc cylinder heads
60 + 2.72966 = 62.72966
708.3096 / 62.72966 = 11.29 or 11.29:1 compression ratio
[ December 06, 2001: Message edited by: horsepower ]</strong><hr></blockquote>
I get 11.03:1 for 60cc combustion chambers.
I have a spreadsheet I have written to calculate this easily. I am working on an article and will release the spread sheet with it. I might release the spread sheet a little earlier.
Eric
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Joined: Nov 2001
Posts: 236
Likes: 0
From: Memphis, TN
Re: What is our stock cc volume? [quote]Originally posted by wizkid:
<strong>
I get 11.03:1 for 60cc combustion chambers.
I have a spreadsheet I have written to calculate this easily. I am working on an article and will release the spread sheet with it. I might release the spread sheet a little earlier.
Eric</strong><hr></blockquote>
yes, i fixed it - goofed my first post <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
<strong>
I get 11.03:1 for 60cc combustion chambers.
I have a spreadsheet I have written to calculate this easily. I am working on an article and will release the spread sheet with it. I might release the spread sheet a little earlier.
Eric</strong><hr></blockquote>
yes, i fixed it - goofed my first post <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
Re: What is our stock cc volume? Is that with a stock 5.7L head milled .030 to achieve 60cc? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by wizkid:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by horsepower:
<strong>
60 cc cylinder heads
60 + 2.72966 = 62.72966
708.3096 / 62.72966 = 11.29 or 11.29:1 compression ratio
[ December 06, 2001: Message edited by: horsepower ]</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I get 11.03:1 for 60cc combustion chambers.
I have a spreadsheet I have written to calculate this easily. I am working on an article and will release the spread sheet with it. I might release the spread sheet a little earlier.
Eric</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by wizkid:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by horsepower:
<strong>
60 cc cylinder heads
60 + 2.72966 = 62.72966
708.3096 / 62.72966 = 11.29 or 11.29:1 compression ratio
[ December 06, 2001: Message edited by: horsepower ]</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I get 11.03:1 for 60cc combustion chambers.
I have a spreadsheet I have written to calculate this easily. I am working on an article and will release the spread sheet with it. I might release the spread sheet a little earlier.
Eric</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">
Re: What is our stock cc volume? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by jhelms:
<strong>WAY BACK IN DECEMBER 2001</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Wow, this post came back from the grave! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<strong>WAY BACK IN DECEMBER 2001</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Wow, this post came back from the grave! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
