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Author Topic: Raised port Stude heads  (Read 57048 times)

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Offline Jack Gifford

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Re: Raised port Stude heads
« Reply #150 on: February 16, 2013, 01:50:10 AM »
Any flow numbers of the stock port, for comparison's sake?
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Offline Milwaukee Midget

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Re: Raised port Stude heads
« Reply #151 on: February 16, 2013, 03:01:22 AM »
Seems when you get it opened up, it flows pretty well. 

Just to help, I logged the readings as presented in the video - rounded off to nearest cfm measurement -

.100    48
.200    87
.300   124
.400   149
.500   169
.600   180
.700   186




It's a solid start, boys!
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Offline zenndog

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Re: Raised port Stude heads
« Reply #152 on: February 16, 2013, 03:30:14 AM »
Here is a link to a test Tom did on a stock head.

http://youtu.be/vVF1Ynh22-A
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Offline Milwaukee Midget

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Re: Raised port Stude heads
« Reply #153 on: February 16, 2013, 09:21:15 AM »
Graph to follow later, but the numbers were -

.100    44
.200    84
.300   109
.400   124
.500   133
.550   135
.600   136
.700    na

When I get back tonight, I'll superimpose these two lines for you, if you'd like.

I suspect you get the bowl opened up and reduce the shrouding, you'll see some pretty impressive increases at the lower lifts.
« Last Edit: February 16, 2013, 08:17:36 PM by Milwaukee Midget »
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Offline Milwaukee Midget

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Re: Raised port Stude heads
« Reply #154 on: February 16, 2013, 05:42:29 PM »
Here you go -

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Offline zenndog

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Re: Raised port Stude heads
« Reply #155 on: February 17, 2013, 07:06:01 PM »
Thanks MM, that really illustrates it well. Looks like something is being accomplished!
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Offline Milwaukee Midget

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Re: Raised port Stude heads
« Reply #156 on: February 17, 2013, 08:12:00 PM »
To give you some idea what might be gained at the lower lifts, here's some numbers for the Midget -

.100   44.0
.200   87.6
.300   111.7
.4500   124.1
.500   125.6

Keep in mind that this is a 5 port head with a 1.48 valve and shared intakes, and I'm only feeding 1 liter.  At .100, .200 and .300, the numbers between your head and mine are virtually identical, but for a one liter engine, it's considered pretty good flow.  If the Stude is punched out to 5 liters, that's 2.5 liters per side, well, you can see where the bottleneck is on the Stude - it's around the valve seat, the bowl, and quite likely shrouded around the valve in the combustion chamber.

ZD, can you post up a pic of the combustion chamber side of this head?

This is a very fun project - I hope it eventually leads to a working set of heads.
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Offline zenndog

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Re: Raised port Stude heads
« Reply #157 on: February 18, 2013, 03:28:45 PM »
Another flow test from Tom. The ports with the runner removed. He tested the stock bowl #7. I did no smoothing past the area I removed the runner from.

Thanks again Tom for doing the tests.

http://youtu.be/OCqVzbto2mo
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Offline Milwaukee Midget

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Re: Raised port Stude heads
« Reply #158 on: February 18, 2013, 07:27:10 PM »
You guys keep throwing me data, and I'll keep printing graphs!



And this is a great example of the "bigger isn't always better" idea.

ZD, I'm happy to help on this - it's all learning and it's all good.
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Offline Milwaukee Midget

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Re: Raised port Stude heads
« Reply #159 on: February 18, 2013, 08:44:03 PM »
Just studying it a bit - and drawing from my limited knowledge, given that the low lift remains virtually unchanged between the three configurations up until ~ .225 lift, the bowl, seat and combustion chamber entry are going to yield the biggest gains in airflow.  I'd even wager you'd be able to best the bigmouth arrangement with properly shaped bowl and valve guide boss reduction and little else.
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Offline zenndog

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Re: Raised port Stude heads
« Reply #160 on: February 19, 2013, 07:47:34 PM »
Here is another set of results, which I think confirms your ideas.

http://youtu.be/8UGfvcbYRCI

Thanks again Tom!
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Offline 38flattie

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Re: Raised port Stude heads
« Reply #161 on: February 20, 2013, 09:26:32 PM »
Zenor, I love this project! Any chance we'll see this design on an engine in the near future?
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Offline Buickguy3

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Re: Raised port Stude heads
« Reply #162 on: February 20, 2013, 09:54:55 PM »
   Am I missing something? It is a siamesed port and it looks like the adjacent port doesn't have a valve in the hole. Are my eyes deceiving me?
   Doug  :cheers: :cheers: :cheers:
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Offline Milwaukee Midget

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Re: Raised port Stude heads
« Reply #163 on: February 20, 2013, 10:22:14 PM »
Quote from: Buickguy3 on February 20, 2013, 09:54:55 PM
   Am I missing something? It is a siamesed port and it looks like the adjacent port doesn't have a valve in the hole. Are my eyes deceiving me?
   Doug  :cheers: :cheers: :cheers:

!

Even if the combustion chamber is covered, the open valve guide would draw air through the top.  Even if guide is plugged, the test isn't entirely accurate.  On shared ports, the swirl and eddies that the valve stem creates in the adjacent valve bowl can have an effect on the valve bowl area being tested. 

Please tell me we're missing something - that's a lot of work you've put into this.
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Offline zenndog

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Re: Raised port Stude heads
« Reply #164 on: February 20, 2013, 11:38:56 PM »
# 1 Low Riser Roof Intake: And the numbers are:

Tom's latest numbers on the #1 port, the port next to the high rise port tested first. Tom's words in italics:

Lift CFM
.100 49.1
.200 97.8
.300 121.8
.400 149.8
.500 167.2
.550 173.6
.600 175.3
.680 179.5

This one performed very well. It is equal and in a fairly even race with the # 3 Hi Riser Design. Only from .500 on does it fail to keep up with the Hi Riser. The guide was sunk deeper and got more lift test on this one. Also better than #5 Big Mouth up to .500".

I don't think there is a valve in the adjacent port, I will mention it to Tom.

38-I have a crazy scheme in mind, I will update as it gels. Either way the first part is building the heads, everything else hinges on that. To move forward with the heads, I must pick which way to go.

I am partial to the high rise#3.
« Last Edit: February 20, 2013, 11:58:11 PM by zenndog »
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