-
Dissecting a cylinder head
by
Luckypabst
on 07 Apr, 2013 13:55
-
Here are a few photos of a 1.6 NA hydro head in cross-section. Unfortunately my degreaser turned all the fresh cut surfaces a nice shade of gray. I also quickly surfaced one slice to bring out the detail in the typical crack between valve seats.
Between valves, cyl #4:
Same:
Between cyl #3 & cyl #4:
Exhaust port, cyl #3:
Intake port, cyl #3:
Crack detail, cyl #4. Crack extends to about the sharpie mark:
Chris
-
#1
by
JASGTi
on 07 Apr, 2013 14:39
-
Now I can see clearly why we don't worry to much about cracks between valves.
-
#2
by
burn_your_money
on 07 Apr, 2013 19:00
-
How wide was that crack? It's getting pretty close to the water jacket.
Are all the ports and water jacket relationships the same? You're showing some excellent info for porting heads.
-
#3
by
Luckypabst
on 07 Apr, 2013 19:34
-
I figured the porters would find that interesting.
The cracks were on the wide end of acceptable when viewed from the combustion chamber. I haven't looked but I would expect those cracks to extend into the ports, though I never experienced any related issues.
-
#4
by
CrazyAndy
on 07 Apr, 2013 19:48
-
I have seen cross-sections of these heads before, but non with detailed shots of both the intake and exhaust ports; thank you. That will be a lot of help to those who were wondering about the water jacket of the inner radius of both ports, as well as the maximum save porting depth.
-
#5
by
wdkingery
on 08 Apr, 2013 19:58
-
Dude thanks for these sweet photos! That baby doll head was fairly ***ed up, but the cross sections were neat!
-
#6
by
theman53
on 08 Apr, 2013 20:32
-
Dude thanks for these sweet photos! That baby doll head was fairly ***ed up, but the cross sections were neat!
I usually don't notice those things but that was the first thing I noticed in those pics. I thought it cool it was winking at me.
Also, you can see why the exhaust side there really aren't that many big gains to be had, but the intake has the huge hump to take down and get flow. That is why I gained 40% on the intake and only 15% on the exhaust on my last head. I will soon be getting my new head *fingers crossed* and will show some stupid numbers on that.
-
#7
by
Luckypabst
on 09 Apr, 2013 08:12
-
For the record, this head is cracked into the water jacket up in the prechamber and injector wells. I'm not sacrificing virgins over here
Chris
-
#8
by
ricosuave
on 09 Apr, 2013 09:24
-
very cool, thanks for posting
-
#9
by
Gizmoman
on 09 Apr, 2013 18:28
-
old school CT scan - very cool
-
#10
by
fast57chevrcr
on 09 Apr, 2013 18:39
-
I agree with every body great Job !!!!
-
#11
by
Syncroincity
on 10 Apr, 2013 19:26
-
Dude thanks for these sweet photos! That baby doll head was fairly ***ed up, but the cross sections were neat!
First thing I thought of:
