Figuring compression........HOW.......is there a calculator?
Figuring compression........HOW.......is there a calculator? I want 10:1 cr out of my 390ci.
I know the crank is 3.825", bore is 4.030", rods are 6.125", head chambers are 65cc.
What piston?
((yes, I'd ask my builder, but he's closed....LOL))
Thanks.
.
I know the crank is 3.825", bore is 4.030", rods are 6.125", head chambers are 65cc.
What piston?
((yes, I'd ask my builder, but he's closed....LOL))
Thanks.
.
I;m trying to figure which piston I need.....
So .051 gasket thickness....LS9 gaslets.
Deck height I guess is whatever a new GenIII LQ9 block is.......
*****and...I think 10.5:1 cr is what I want. As I'll be using E85 with 18psi.*****
.
So .051 gasket thickness....LS9 gaslets.
Deck height I guess is whatever a new GenIII LQ9 block is.......
*****and...I think 10.5:1 cr is what I want. As I'll be using E85 with 18psi.*****
.
http://www.wallaceracing.com/cr_test2.php
I'm getting about 8cc dish with the piston .008 above the deck
I'm getting about 8cc dish with the piston .008 above the deck
http://www.wallaceracing.com/cr_test2.php
I'm getting about 8cc dish with the piston .008 above the deck
I'm getting about 8cc dish with the piston .008 above the deck
What for valve relief/dome? Isn't this what I'm looking for to choose the proper -cc piston?
.
ok -.008 deck height is the piston sticking up out of the hole 8 thousands which should be fairly close using shelf parts, but this makes a big difference on compression so it really should be checked before the heads go on.
4.030 bore
3.825 stroke
65cc head
10cc dish
.051 gasket
4.060 gasket size
-.008 deck
exactly 10.5:1
4.030 bore
3.825 stroke
65cc head
10cc dish
.051 gasket
4.060 gasket size
-.008 deck
exactly 10.5:1
ok -.008 deck height is the piston sticking up out of the hole 8 thousands which should be fairly close using shelf parts, but this makes a big difference on compression so it really should be checked before the heads go on.
4.030 bore
3.825 stroke
65cc head
10cc dish
.051 gasket
4.060 gasket size
-.008 deck
exactly 10.5:1
4.030 bore
3.825 stroke
65cc head
10cc dish
.051 gasket
4.060 gasket size
-.008 deck
exactly 10.5:1
.
