Verify compression/quench!
Thread Starter
TECH Apprentice
Joined: Oct 2005
Posts: 320
Likes: 0
From: Norwalk, CT
Verify compression/quench! Shooting for around 12:1 compression, not sure on quench. Here's what I got.
heads 62cc
piston relief 5cc
cometics .060"
gasket bore 4.130"
cyl bore 4.030
piston to deck .019 out of the hole (no comments please
)
I came out w/ 11.975 static comp and .041 quench.
If my math is correct I think that is as close as I can get with the quench. If I go to a .051" gasket and a bigger cc head to keep 12:1 the quench is too tight
(.030"!)
If cometic made a .056 gasket I would be at a .037 quench-I thought that would be ideal but not sure if they make that thickness. What do you guys think?
By the way-its an iron 408 and I have not ordered the heads yet. Going with TEA TFS. I hope I covered everything-I'm sure someone will let me know if I didnt
heads 62cc
piston relief 5cc
cometics .060"
gasket bore 4.130"
cyl bore 4.030
piston to deck .019 out of the hole (no comments please
)I came out w/ 11.975 static comp and .041 quench.
If my math is correct I think that is as close as I can get with the quench. If I go to a .051" gasket and a bigger cc head to keep 12:1 the quench is too tight
(.030"!)
If cometic made a .056 gasket I would be at a .037 quench-I thought that would be ideal but not sure if they make that thickness. What do you guys think?
By the way-its an iron 408 and I have not ordered the heads yet. Going with TEA TFS. I hope I covered everything-I'm sure someone will let me know if I didnt
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
From what I have read you would be better off with the smaller combustion chamber. That would help for a better burn. On the flip side I don't recall anyone building a motor with the piston .019" out of the hole. So there may be other factors at play here.
Thread Starter
TECH Apprentice
Joined: Oct 2005
Posts: 320
Likes: 0
From: Norwalk, CT
Originally Posted by 1989GTA
From what I have read you would be better off with the smaller combustion chamber. That would help for a better burn. On the flip side I don't recall anyone building a motor with the piston .019" out of the hole. So there may be other factors at play here.
and machining a new block.
Thread Starter
TECH Apprentice
Joined: Oct 2005
Posts: 320
Likes: 0
From: Norwalk, CT
Originally Posted by vanilla89
.030 quench is not to much,i'm running cometic .030 with the piston .004
out of the hole
out of the hole
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I am not an engine builder, but am currently having one built by a shop that knows their ****. We have discussed proper quench and they firmly say the between .040 and .045 is the "magic number" for best power and efficiency.
