Critique my head porting

[ncdirtrider249]

No worries! It's not that I don't know what I'm doing...I'm just not fimiliar with terms and everything associated with the acutal porting process. Like I said in my first port, I ported and polished the heads on my motorcycle, along with my old dirt bikes, and even my Dad's bikes. It's just I've never done a head on a car, and I'm new to it. So, it's definitely a learning process, but if it gets messed up, that's not a big deal. I still have the head that's on my car that I can do if this one gets messed up bad. This is a 2g head, and is going to go on a 6 bolt block. But thanks for the help everyone! I appreciate all the insight!

 

[viperlp01]

Here we go with the "porting doesn't matter" BS.

 

[Diamond Star Werks]

They'll learn....one day..i think

 

[BogusSVO]

Unless you have a flow bench, or have several hundred hours of porting experience leave the floor and the short turn radius alone. Shine it is all, and just touch it to remove any cast flashing.

Somthing I found stashed on the board.

http://www.dsmtuners.com/forums/art...1g-head-flow-numbers-intake-designs-long.html

 

[JacksonAuto]

Here we go with the "porting doesn't matter" BS.

Silly John. Don't you know you can make 750hp and run low 9's with a stock engine? Just need reground cams and EVO springs and retainers.

 

[BogusSVO]

Silly John. Don't you know you can make 750hp and run low 9's with a stock engine? Just need reground cams and EVO springs and retainers.

 

[viperlp01]

Silly John. Don't you know you can make 750hp and run low 9's with a stock engine? Just need reground cams and EVO springs and retainers.

Unfortunately for most making more power is the turn of a knob on forced induction. When you start pushing the envelope you realize how much a quality cylinder head matters. Its the difference between winning and packing it up into the trailer.

 

[dsmcurse]

^^very well said^^

 

[Fehrion_sit]

i smoothed out all the casting flash, knifed the runners, gasket matched, 3 angle valve job and, swirled the top of the valves. i did not want to change the shape of the bowl.

i can't notice any particular power gains to be honest but we all know the easier she breaths the better she'll run!

 

[phunny]

Silly John. Don't you know you can make 750hp and run low 9's with a stock engine? Just need reground cams and EVO springs and retainers.

Can't believe you guys forgot the mos important part... On a 14b with a little weight reduction.

 

[JacksonAuto]

Can't believe you guys forgot the mos important part... On a 14b with a little weight reduction.

'DOH! That explains it!

 

[Diamond Star Werks]

Knife edging is good for the exhaust side because air is exiting. But for the same reason nascar and butcher cranks are rounded on the forward side to avoid coming to a point, logically it only makes sense to apply the same to the intake ports on a head.

Air is a fluid, for those that don't understand it well think of it as water. What does water do when it hits a point?
It will split like this:

You must be logged in to view this image or video.

.

Since air is a fluid the same fluid dynamics of moving water can be applied to moving air. IMO even though some will look at a port like that and say amazing port work. I look at it and see an unfinished job. The edge should be carefully rounded for optimum flow into the head.

The top of the divider needs more work as well. As it looks terribly flat which would, IMO, create turbulence. As once again, air being a fluid, when air hits that its going to split to the sides instead of having a smooth transition over that area.

I may not be a guy with tons of experience in this type of stuff, but I'm no dumbass. I do believe my point is valid. I would like to hear some opinions on this as well. It may be a small detail some deem unaccountable but IMO its the details that win.

 

[bastarddsm]

Everyone always knife edges the divder tho......

 

[Diamond Star Werks]

Btw, disclaimer , I'm not knocking your work FE. Just figured I'd critic it for the sake of intelligent conversation and learning.
Plus this is the critique my head port job thread isn't it?

 

[Diamond Star Werks]

Everyone always knife edges the divder tho......

Its good but its not the best way. Fluid flows best over a smooth round surface, not a point/flat spot.
Everyone also knows what happens when air or fluid hits a point/flat spot, right?

It's simple fluid dynamics. And in my opinion it seems only best to do that on the exhaust side. I could explain that to if needed.

I'm not one to follow the crowd in case you haven't noticed .

 

[bastarddsm]

Oh i know the ideas behind the radius...

 

[turbo23]

Knife edging is good for the exhaust side because air is exiting. But for the same reason nascar and butcher cranks are rounded on the forward side to avoid coming to a point, logically it only makes sense to apply the same to the intake ports on a head.

Air is a fluid, for those that don't understand it well think of it as water. What does water do when it hits a point?
It will split like this:

You must be logged in to view this image or video.

.

Since air is a fluid the same fluid dynamics of moving water can be applied to moving air. IMO even though some will look at a port like that and say amazing port work. I look at it and see an unfinished job. The edge should be carefully rounded for optimum flow into the head.

The top of the divider needs more work as well. As it looks terribly flat which would, IMO, create turbulence. As once again, air being a fluid, when air hits that its going to split to the sides instead of having a smooth transition over that area.

I may not be a guy with tons of experience in this type of stuff, but I'm no dumbass. I do believe my point is valid. I would like to hear some opinions on this as well. It may be a small detail some deem unaccountable but IMO its the details that win.

The port in the picture is an exhaust port. the divider is also blended evenly from top to bottom, though its hard to see this in the picture. Knife-edging vs rounding the divider in the intake port is a large conversation, but I'll tell you that on the flow-bench the knife edge works. I'll also say that the flow dynamics of a cylinderhead have very little incommon with the flow dynamics of anything else.

 

[Diamond Star Werks]

The port in the picture is an exhaust port. the divider is also blended evenly from top to bottom, though its hard to see this in the picture. Knife-edging vs rounding the divider in the intake port is a large conversation, but I'll tell you that on the flow-bench the knife edge works. I'll also say that the flow dynamics of a cylinderhead have very little incommon with the flow dynamics of anything else.

Has there been a debate thread on the two that I could read?

Edit:I ok maybe it was my phone. Looking on the pooter it does look much better. Actually looks more like a blunt knife and not a sharp point. Which is more what i was thinking. I didn't mean a big large round face. Just was thinking a sharp knife edge job wouldn't be good. Your correct that does look well blended.

Reason i put my critic out there so i could get critic back.

 

[turbo23]

Has there been a debate thread on the two that I could read?

Not that I know of, Info like this is hard to find, you'll probably get a few people saying they know. In my experience the people that actually know, wont tell.. My conclusions are drawn from my own flow bench/dyno/racing experience, along with some help from another cylinder-head guru that is local to me.

 

[91stocker]

Its good but its not the best way. Fluid flows best over a smooth round surface, not a point/flat spot.
Everyone also knows what happens when air or fluid hits a point/flat spot, right?

It's simple fluid dynamics. And in my opinion it seems only best to do that on the exhaust side. I could explain that to if needed.

I'm not one to follow the crowd in case you haven't noticed .

I agree with most of this. Just notice the leading edge of a wing or the nose of a modern nuke sub. I've always thought of it as, if the air were standing still and the divider was trying to move through the air. Iirc the term for it was "flow separation", which by definition would equate to unequal air flow between ports, correct? I know side load or lift are not worries here. Sorry not a physics major , but it works in real world situations.

But i've also heard a rounded trail edge on the exhaust side aids in scavenging. There's a lot of science that goes into head design. Interesting stuff. I'd love to see a side by side test.

 

[viperlp01]

We are making some videos of our port work. We can't tell you all the magic we put into it but we will do our best to share some insight into the port work. Stay tuned

 

[Diamond Star Werks]

Say tuned

Looking forward to it.
And okay....."tuned!" Lol

 

[viperlp01]

Here is some videos I am waiting for 2 more to upload. All the videos are based around the exhaust port.

https://www.youtube.com/watch?v=dNT7IMxteDw&feature=plcp

https://www.youtube.com/watch?v=fwIfxEiTAMQ

 

[jmartinez1228]

Crazy how he goes to town on the first vid and doesn't touch the valve seat. Seems like he was all over it. Thanks for the vids.

 

[Diamond Star Werks]

Are they locked or is it my phone? Both said sorry this video cannot be played.