AMC/KS heads for wbx engines
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AMC/KS heads for wbx engines
These always seem to have a degree of misalignment between the casting and the machining, most evident when looking up the ports from the combustion chamber side. Some are worse than others!
An couple of hours careful die-grinder work with a carbide burr on a flexi extension blending out the steps and smoothing off the casting snots is time well spent, improving gas flow and giving better cylinder filling especially at lower engine rpm.
Before and after:
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An couple of hours careful die-grinder work with a carbide burr on a flexi extension blending out the steps and smoothing off the casting snots is time well spent, improving gas flow and giving better cylinder filling especially at lower engine rpm.
Before and after:
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Re: AMC/KS heads for wbx engines
Blimey that looks like a fair bit of metal removed.
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Re: AMC/KS heads for wbx engines
Less than an eggcup full when I swept up, from both heads
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Re: AMC/KS heads for wbx engines
Do you put these on a flow bench to compare ports and see the difference before and after porting?
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Re: AMC/KS heads for wbx engines
No, I dont flow test them, but they can be so bad that any amount of smoothing and reshaping must be beneficial. The torque delivery of my engines suggests that I'm doing the right thing
Checked the exhaust valve guides and surprise surprise, the 9.0mm reamer wont go down the bore as per usual...
(If the guide isnt reamed out, this will cause a hanging valve when the engine warms up and then a bent pushrod, at best)
AMC/KS really do need to get their act together imho
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Checked the exhaust valve guides and surprise surprise, the 9.0mm reamer wont go down the bore as per usual...
(If the guide isnt reamed out, this will cause a hanging valve when the engine warms up and then a bent pushrod, at best)
AMC/KS really do need to get their act together imho
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Re: AMC/KS heads for wbx engines
Old fashioned empirical engineering
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Re: AMC/KS heads for wbx engines
silverbullet wrote:No, I dont flow test them, but they can be so bad that any amount of smoothing and reshaping must be beneficial. The torque delivery of my engines suggests that I'm doing the right thing
Checked the exhaust valve guides and surprise surprise, the 9.0mm reamer wont go down the bore as per usual...
(If the guide isnt reamed out, this will cause a hanging valve when the engine warms up and then a bent pushrod, at best)
AMC/KS really do need to get their act together imho
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Ah fair enough, I was just curious. It's amazing the improved performance that can be had from properly ported and matched ports/manifolds.
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Re: AMC/KS heads for wbx engines
Fitting937carrera wrote:
Old fashioned empirical engineering
When I was a lad apprentice toolmaker, Stan the Man the cylindirical grinder would allow for bush internal diameters closing up when pressed into a bore.
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Re: AMC/KS heads for wbx engines
tobydog wrote:Fitting937carrera wrote:
Old fashioned empirical engineering
When I was a lad apprentice toolmaker, Stan the Man the cylindirical grinder would allow for bush internal diameters closing up when pressed into a bore.
Yep, that's one of Dad's tricks too
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Re: AMC/KS heads for wbx engines
Funny that golf balls do not have a smooth suface as it lessens drag.
Shark/ dolphin skins are rough, so they can swim fast.
I would think some roughness would be benificial to flow?
Shark/ dolphin skins are rough, so they can swim fast.
I would think some roughness would be benificial to flow?
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Re: AMC/KS heads for wbx engines
kevtherev wrote:Funny that golf balls do not have a smooth suface as it lessens drag.
Shark/ dolphin skins are rough, so they can swim fast.
I would think some roughness would be benificial to flow?
"Dimples on a golf ball create a thin turbulent boundary layer of air that clings to the ball's surface. This allows the smoothly flowing air to follow the ball's surface a little farther around the back side of the ball, thereby decreasing the size of the wake."
https://www.scientificamerican.com/arti ... n-golf-ba/" onclick="window.open(this.href);return false;
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1986 Multivan ex-Caravelle. Van since 2006, running mTDi 1Z since 2008 with Fiat Croma 1.9 TDid pump 2008-2019, custom pump since 2019
5spd custom box 4.57 diff + 0.74 5th
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Re: AMC/KS heads for wbx engines
Overall port shape/profile is far more important than surface finish for that very reason. I leave them with the finish that results from the carbide burrs used to reshape the port walls.
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