High Flow, Low Cost, 8V Cylinder Head Project
06-11-2012, 02:44 AM
#47
Rennlist Member
06-11-2012, 08:31 AM
#48
Three Wheelin'
It would appear that the intakes in this head are too big. The valves are almost touching the side of the combustion chambers.
06-11-2012, 09:17 AM
#49
Rennlist Member
Thread Starter
Yep, that's what it looked like to me too.
Yes, it appears like a lot of shrouding, but word is this was an awesome flowing head.
Yes, it appears like a lot of shrouding, but word is this was an awesome flowing head.
06-11-2012, 09:48 AM
#50
Rennlist Member
Still don't believe 450whp a@ 16psi but by all accounts it's a fast car.
06-11-2012, 07:29 PM
#51
Rennlist Member
Thread Starter
By the way, I should also advise you that you need to make sure those are 1 piece valves. The majority of cheap valves are 2 piece, where the head is friction welded to the stem. Not as big of a deal in an NA application, but there's a lot more heat in a boosted application.
Good stuff!
06-11-2012, 09:14 PM
#53
Rennlist Member
+1, good reads. I did a Helmholtz/perforated absorber project in college. Always fun to mix my job in acoustics with my hobby of cars.
06-11-2012, 09:42 PM
#54
Race Car
06-11-2012, 10:48 PM
#56
Rennlist Member
Thread Starter
Finished cleaning up the exhaust ports. Three of the liners were off about 0.030"-.040" as show in the "before" picture below. Also cleaned things up a bit at the header interface.
06-11-2012, 11:02 PM
#57
Rennlist Member
Thread Starter
The intake: I removed casting lines, defects, machining marks and smoothed the surface, generally without changing the geometry of the ports. I also port matched the intake manifold. The new seats go in tomorrow and the plan is to look at the intake ports again after for final blending.
The exhaust: I cleaned up misaligned liners as shown above and cleaned up a bit of casting defects around the inside of the header interface.
The plan is the remove about 1mm from the combustion chamber wall to un-shroud the intake using a mill.**
**NOTE: I am able to un-shroud the intake in this way as my cylinder bore is just over 102 mm.
The exhaust: I cleaned up misaligned liners as shown above and cleaned up a bit of casting defects around the inside of the header interface.
The plan is the remove about 1mm from the combustion chamber wall to un-shroud the intake using a mill.**
**NOTE: I am able to un-shroud the intake in this way as my cylinder bore is just over 102 mm.
