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Old 09-10-2006, 09:31 PM   #51
shvrdavid
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The cam spec I cam up with should idle smooth, at about 1600 rpm

The reason I choose 413 lift is based on 2 factors...

The first one being the way my heads are ported, they flow very well from .2 up, but peak about .45

The second is that I dont want to limit my max rpm with too much lift...

I need to do some more checking with the specs I cam up with and valve interference... They may limit the amount of cam phasing I can do with such high durations...
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Old 09-10-2006, 09:49 PM   #52
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Quote:
Originally Posted by shvrdavid View Post
The cam spec I cam up with should idle smooth, at about 1600 rpm

Haha, I like it
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Old 09-10-2006, 11:55 PM   #53
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Quote:
Originally Posted by shvrdavid View Post
... I dont want to limit my max rpm with too much lift...
Got it. At say, .421, you'd be pushing against 16 stouter springs 8000 every minute.
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Old 09-16-2006, 06:51 PM   #54
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Update...

Here is a picture of the intake ports on the head that they are finally done on... minus the new guides and final seat cutting...


And yes, that is a quarter in the port...

I have to match the other head to this, then punch the guides out to finish the exhaust ports...

I am slowly getting there...
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Old 09-16-2006, 07:18 PM   #55
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Congrats on the progress and thanks for the pic.
Lookin' good!
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Old 11-08-2006, 09:11 PM   #56
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bumpity...can't wait to start on mine...I have a superflow, pitot tubes and port velocity analysis software.
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Old 11-08-2006, 09:31 PM   #57
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I think that this has been the best thread I have ever come across on this site so far... great info!

Subscribed
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Old 03-06-2007, 06:44 PM   #58
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I made a few changes to the intake ports on my heads...
I did some more flow testing to them under pressure...
I set them up so 30 psi was blowing thru them at .4" lift with a 4" pipe on the block side...
I noticed a few spots in them that did not flow properly at the bowls... People also question the knife edge in the center of the runner......
The knife edge is actually an advantage under pressure... So it stayed...

The runners and the bowls needed a little tweaking to promote even flow around the valve heads...

Here is a picture of the runners now....
Excuse the crappy picture... I took it with my phone in very bright light...


Yes, these ports are huge... I am not ready to post the cc, or the flow rates...
Lets just say that they will move plenty of air......

I am going to do similar tests to the exhaust ports in the coming weeks...
Then the guides will be replaced, and the valve train will be assembled, minus the cams...
I am still debating the cams...
Looks like the turbo will be a 4094r twin scroll...
http://www.atpturbo.com/Merchant2/me...egory_Code=GRT
The intake and the header will be custom made by me as well....

More to follow on the exhaust side....
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Old 03-08-2007, 12:47 PM   #59
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Awesome.
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Old 03-08-2007, 05:57 PM   #60
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Quote:
Originally Posted by shvrdavid View Post
Looks like the turbo will be a 4094r twin scroll...
http://www.atpturbo.com/Merchant2/me...egory_Code=GRT

Excellent choice!!

BTW, I applaud your progress throughout your build and appreciate your williingness to share with the rest of us

This thing is going to be a beast when it's done!
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Old 03-08-2007, 07:44 PM   #61
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Here are some pics of the exhaust ports...

More crappy ones taken with my phone....

Here is the strait one...


Here is the dreaded dogleg




As I am sure you will notice, my exhaust ports don't look like a lot of other ported ones...

I came up with this design for the doglegs after many different trail and error clay ports...
If you flow the factory dogleg, it flows more thru one of the valves than the other one...
That will actually restrict high speed flow, so I found a way around it...
Now all I have to do is figure out how to get the strait ones to flow the same amount...
Right now the doglegs out flow the strait ones...

A few more hours of tweaking, flowing, and balancing these ports, and I will be done with them...

Then I have to make the header, turbo mount, and downpipe.....
Then I have to make an intake to match the turbo and cams.....

Hopefully it will be in the car this summer......
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Old 03-09-2007, 08:25 AM   #62
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david, once your porting is done, you should bring it to a shop that can 3-d map the interior surfaces.
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Old 10-12-2007, 09:50 PM   #63
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Just a few updated pics...




I am still working on them....
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Old 10-13-2007, 01:33 AM   #64
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I'm still suprised by the dogleg ports out flowing the straight exhaust ports...I really want to get mine on the bench so I can stop doing blind port work. Also don't how steep of an angle the straight exhaust port flows back together.

also, what are you using for tooling?...seeing how you got into a certain section of the dog-leg port makes me wonder.
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Old 10-13-2007, 09:02 AM   #65
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Thanks for keeping this updated. It is amazing how there are not more responses in a thread like this where there is some serious solid information.
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Old 10-13-2007, 09:07 AM   #66
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Quote:
Originally Posted by Homemade WRX View Post
also, what are you using for tooling?...seeing how you got into a certain section of the dog-leg port makes me wonder.
One hint that I will give you about the exhaust ports, is that they flow under pressure...

Many people forget to check that, they just check for depression flow...
Some people will argue that there is no difference...
But there is...

Turbo engines have high pressure and temp in the exhaust...
Now is that a dry depression flow, or a wet pressure flow???

As far as how I got to certain ports of the exhaust ports, thats my secret...
Lets just say I have the right tools for the job....
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Old 10-14-2007, 06:36 AM   #67
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Times are changing, dry flow testing is no longer what you need to aim for, it now is a new world or wet flow, real world stuff....

http://www.superchevy.com/technical/...t_flow_testing

And then a CNC seat cutting machine, can make what ever shapes you can program in with a single tip edged tool, no multi angles anymore.


http://www.youtube.com/watch?v=ynRDk7fveB0

http://www.youtube.com/watch?v=hnCiSd_ZHio
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Old 10-14-2007, 08:00 AM   #68
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Quote:
Originally Posted by MSR View Post
Times are changing, dry flow testing is no longer what you need to aim for, it now is a new world or wet flow, real world stuff....

http://www.superchevy.com/technical/...t_flow_testing
very interesting... especially how the power/torque gains would never be predicted by the dry flow increases!
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Old 10-14-2007, 09:33 AM   #69
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Quote:
Originally Posted by ride5000 View Post
very interesting... especially how the power/torque gains would never be predicted by the dry flow increases!
Not what you would expect, is it...
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Old 10-31-2007, 02:12 PM   #70
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great thread. Lots of good info.
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Old 10-31-2007, 02:38 PM   #71
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Quote:
Originally Posted by MSR View Post
Times are changing, dry flow testing is no longer what you need to aim for, it now is a new world or wet flow, real world stuff....

http://www.superchevy.com/technical/...t_flow_testing

And then a CNC seat cutting machine, can make what ever shapes you can program in with a single tip edged tool, no multi angles anymore.


http://www.youtube.com/watch?v=ynRDk7fveB0

http://www.youtube.com/watch?v=hnCiSd_ZHio

yup, both are well known though...shop engine shop that wants me to be there R&D engineer is buying a new complete sf1020 wet bench, a newen contour and a new 5-axis...they still don't want to listen that the contour is a waste if you have a 5-axis but oh well. Just means more toys if I decide to go and play there.
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Old 10-31-2007, 07:01 PM   #72
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Quote:
Originally Posted by Homemade WRX View Post
yup, both are well known though...shop engine shop that wants me to be there R&D engineer is buying a new complete sf1020 wet bench, a newen contour and a new 5-axis...they still don't want to listen that the contour is a waste if you have a 5-axis but oh well. Just means more toys if I decide to go and play there.
Someone is going to be spending a lot of money on a machine that takes a long time to make a profit... The Newen does have its advantages, but so does a 5 axis machine....

Unless the shop has an incredible volume of valve jobs, the Newen is not what I would consider a wise investment...

For what a Newen costs, you could buy a very well equipped 5 or 6 axis that will be far more useful in the long run...
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Old 10-31-2007, 10:17 PM   #73
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david, you are making the same argument Willie (their head machiniest) and I keep making...
for now they still run the serdi
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Old 11-01-2007, 08:30 AM   #74
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^^^^It amazes me sometimes how management don't listen to the people on the shop floor. Anyway here is a set of heads for a top fuel drag bike (2500hp) i made about a year ago on a 5-axis machine. Pretty much anything is possible on a 5axis.

http://s4.photobucket.com/albums/y11...t=MOV02483.flv

http://s4.photobucket.com/albums/y11...t=MOV02495.flv



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Old 11-01-2007, 10:34 AM   #75
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[borat]very nice. How much? [/borat]

what bike is that for?...a 3v head, has me thinking

as for the shop, the owner listens but has clue about machining....he just likes buying the nice tools to get the job done...we are just telling him to save his money.

Last edited by Homemade WRX; 11-01-2007 at 10:42 AM.
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