lq4 with milled l92s what compression?
03-25-2010, 03:50 AM
#1
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lq4 with milled l92s what compression? putting together an l92 headed lq4. will have the stock bottom end. heads will be milled to either 67 or 68cc chambers. can anyone tell me what compression that will give?
03-25-2010, 08:12 PM
#6
Bore 4
ST = Stroke 3.622
RL = Rod Length 6.098
Number of cylinders 8
Deck Height (how much pistons come out of the hole) -0.01
Piston Dome or Dish (- for a dome + for a dish) 6.7
Compressed Head gasket thickness 0.052
Cylinder Head Chamber Volume 68
Static Compression Ratio 9.95 :1
ST = Stroke 3.622
RL = Rod Length 6.098
Number of cylinders 8
Deck Height (how much pistons come out of the hole) -0.01
Piston Dome or Dish (- for a dome + for a dish) 6.7
Compressed Head gasket thickness 0.052
Cylinder Head Chamber Volume 68
Static Compression Ratio 9.95 :1
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03-26-2010, 06:53 AM
#8
Bore 4
ST = Stroke 3.622
RL = Rod Length 6.098
Number of cylinders 8
Deck Height (how much pistons come out of the hole) -0.01
Piston Dome or Dish (- for a dome + for a dish) 6.7
Compressed Head gasket thickness 0.052
Cylinder Head Chamber Volume 68
Static Compression Ratio 9.95 :1
ST = Stroke 3.622
RL = Rod Length 6.098
Number of cylinders 8
Deck Height (how much pistons come out of the hole) -0.01
Piston Dome or Dish (- for a dome + for a dish) 6.7
Compressed Head gasket thickness 0.052
Cylinder Head Chamber Volume 68
Static Compression Ratio 9.95 :1
Sometimes you have to check for yourself to find out. The only part on mine I didnt physically check was the head gasket compressed thickness.
03-26-2010, 07:12 AM
#9
What books, this is just a calculator. I CC'd my heads, check the dish on the piston, measure how far above the deck the pistons are, compressed GM head gasket is .052, ID of my 6.2L head gaskets are 4.065. etc etc.
Don't know what to tell you, not much more to measure.
Even with cam I ran before and the one I have now I do not have PTV issues or any other problems. My math and physically measuring of my engine seems to work.
Don't know what to tell you, not much more to measure.
Even with cam I ran before and the one I have now I do not have PTV issues or any other problems. My math and physically measuring of my engine seems to work.
03-27-2010, 10:36 PM
#10
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Hey 69LT1bird,I like the combo,i'm looking to do a similar one. How does it feel with that new cam? Have you run it down the track yet to get new numbers?
03-28-2010, 07:39 AM
#11
What books, this is just a calculator. I CC'd my heads, check the dish on the piston, measure how far above the deck the pistons are, compressed GM head gasket is .052, ID of my 6.2L head gaskets are 4.065. etc etc.
Don't know what to tell you, not much more to measure.
Even with cam I ran before and the one I have now I do not have PTV issues or any other problems. My math and physically measuring of my engine seems to work.
Don't know what to tell you, not much more to measure.
Even with cam I ran before and the one I have now I do not have PTV issues or any other problems. My math and physically measuring of my engine seems to work.
03-28-2010, 07:56 AM
#12
No track times yet. I am trying to finish up my tuning. The weather here hasn't been the most cooperative. The cam feels great, nice lopey idle, feels much better in the higher rpm ranges, much better breathing, still breaks the tires loose without hardly trying. I think it will be a good cam for my car. I still need to move the shift points up a couple hundred more rpms. The track opens Easter weekend so I will shoot for the weekend after that. That first weekend will be a zoo.
I heard on flat tops, this cam will require flycutting. One side benefit so far is the valvetrain is very quiet. Gotta like that part.
I heard on flat tops, this cam will require flycutting. One side benefit so far is the valvetrain is very quiet. Gotta like that part.
03-28-2010, 03:50 PM
#13
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What books, this is just a calculator. I CC'd my heads, check the dish on the piston, measure how far above the deck the pistons are, compressed GM head gasket is .052, ID of my 6.2L head gaskets are 4.065. etc etc.
Don't know what to tell you, not much more to measure.
Even with cam I ran before and the one I have now I do not have PTV issues or any other problems. My math and physically measuring of my engine seems to work.
Don't know what to tell you, not much more to measure.
Even with cam I ran before and the one I have now I do not have PTV issues or any other problems. My math and physically measuring of my engine seems to work.
