Question on port matching

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rumblefish360 said:
Thanks. But! Even though it was a really good video, I have one point of disagreement with the videographer. The floor doesn’t move or provide energy. Resistance, yes! Resistance! I see where that can be seen or likened to movement.

Should you find a video within the cylinder head showing your side, I’d be much more in minded to flip my position on which is better. Shy of a back to back dyno test with a listing of port mismatch amounts going both ways….. I still think the fuel & air charge crashing into the cylinder head is worse.

It also makes me wonder, not only what differences would show up on a .010, .100, 1/4”, but also at different power levels and engine sizes. On both points of view of course! Ow my mind is wondering a bit deeper and it just makes me want to experiment. Now if I only had a dyno!
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I won’t be able to find any video of that happening in a port. But fluid dynamics is fluid dynamics. It doesn’t matter if it’s in a port or anything else.

Edit: I see what you are struggling with. The fuel and air do not crash into the port wall, they shear off of it. There isn’t any crashing there. I may be able to find some video of that. It may take me a bit. I’m back home and off the phone so it will be easier to look around YouTube.
 
I sometimes experience laminar flow and other times turbulent flow in the bathroom. :eek:
 
rumblefish360 said:
Thanks. But! Even though it was a really good video, I have one point of disagreement with the videographer. The floor doesn’t move or provide energy. Resistance, yes! Resistance! I see where that can be seen or likened to movement.

Should you find a video within the cylinder head showing your side, I’d be much more in minded to flip my position on which is better. Shy of a back to back dyno test with a listing of port mismatch amounts going both ways….. I still think the fuel & air charge crashing into the cylinder head is worse.

It also makes me wonder, not only what differences would show up on a .010, .100, 1/4”, but also at different power levels and engine sizes. On both points of view of course! Ow my mind is wondering a bit deeper and it just makes me want to experiment. Now if I only had a dyno!
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Run a back to back dyno test on an oval port rat motor, with identical oval port and big port intakes. (I'm betting on the oval port......)
 
33IMP said:
Run a back to back dyno test on an oval port rat motor, with identical oval port and big port intakes. (I'm betting on the oval port......)
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That is one of the very few exceptions of when that works. When that came out in the mid 1990’s everyone and their mother tried it. And it was a loser.
 
Rat Bastid said:
Here is one video. It’s a PITA to do this on my phone so I hope it works.



I’ll post a couple more when I get home.
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Pretty interesting. I would imagine that turbulent flow in a intake or head runner would benefit the fuel and air mixing. I though I heard or read that the intake side should be a bit rough and the exhaust side be smoother. (to aid in laminar flow)
 
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toolmanmike said:
Pretty interesting. I would imagine that turbulent flow in a intake or head port would benefit the fuel and air mixing. I though I heard or read that the intake side should be a bit rough and the exhaust side be smoother. (to aid in laminar flow)
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Exactly.
 
toolmanmike said:
Pretty interesting. I would imagine that turbulent flow in a intake or head port would benefit the fuel and air mixing. I though I heard or read that the intake side should be a bit rough and the exhaust side be smoother. (to aid in laminar flow)
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It would help with a better burn and mileage. The manufacturer called this a “Swirl Port Head.”
 
rumblefish360 said:
It would help with a better burn and mileage. The manufacturer called this a “Swirl Port Head.”
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I goofed, I was thinking more about the runner and not the port because we are talking about port matching.
 
Tonight’s project
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Rat Bastid said:
Edit: I see what you are struggling with. The fuel and air do not crash into the port wall, they shear off of it. There isn’t any crashing there. I may be able to find some video of that. It may take me a bit. I’m back home and off the phone so it will be easier to look around YouTube.
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I didn’t watch the videos yet…..

EDIT!! OMGosh! 30+ minutes a pop! O-G’s, I’m gonna have to skip that for now.

Wait! I’m getting confused in which is which in the discussion! LMAO!

Your now talking about a smaller intake port into a larger head port?


33IMP said:
Run a back to back dyno test on an oval port rat motor, with identical oval port and big port intakes. (I'm betting on the oval port......)
Click to expand...

I will not dyno test anything but my MoPar!
:rofl:

Now if I hit megamillions…. Line up your requests!
:thumbsup:
 
rumblefish360 said:
It pays good dividends the higher up in power you go.
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If you can find another ten percent on a 300hp 318 or 360 you will feel the increase ,that's why I always look for all ways to make or free up power...
On my big blocks I blend and port the oil pump cover even the area under the filter. That ones two a twofer free up parasitic power loss and increase reliability.
It all makes a difference..
 
pittsburghracer said:
Tonight’s project View attachment 1715849939View attachment 1715849940
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No projects for me tonight, I know you’ve ported the Victor 340’s in the past, I think I’ve read where you are fond of them? I recently acquired this new one and getting ready to work it over. Not sure if I read they were 318 windows but regardless, Have they always been like this?? Luckily the gasket lines up and doesn’t protrude beyond the side walls of any runners badly that I can shift them slightly.

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12many said:
No projects for me tonight, I know you’ve ported the Victor 340’s in the past, I think I’ve read where you are fond of them? I recently acquired this new one and getting ready to work it over. Not sure if I read they were 318 windows but regardless, Have they always been like this?? Luckily the gasket lines up and doesn’t protrude beyond the side walls of any runners badly that I can shift them slightly.

View attachment 1715849955

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Port match it vs gasket matching .
Watch Eric Weingartners video on it .
 
mbaird said:
Port match it vs gasket matching .
Watch Eric Weingartners video on it .
Click to expand...
Yes yes, there’s no telling how this intake would line up on a set of heads if I just gasket matched. Definitely trial fitting, adjusting as needed and then scribing etc
 
12many said:
No projects for me tonight, I know you’ve ported the Victor 340’s in the past, I think I’ve read where you are fond of them? I recently acquired this new one and getting ready to work it over. Not sure if I read they were 318 windows but regardless, Have they always been like this?? Luckily the gasket lines up and doesn’t protrude beyond the side walls of any runners badly that I can shift them slightly.

View attachment 1715849955

View attachment 1715849956

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I love Victor 340’s
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I’m doing this intake for the first (paying) customer I’ve had in over three years. 9pm and one side roughed in. I’ll start on the othe side and go till around 9:30-10:00. Then plenum time and match the two together.
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Here we go ... I think this is a good brief vid on port matching .

 
Nothing there from MBE about making the port opening in the intake manifold larger....
 
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