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09-10-2006, 09:31 PM | #51 |
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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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09-10-2006, 09:49 PM | #52 |
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09-10-2006, 11:55 PM | #53 |
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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... |
09-16-2006, 07:18 PM | #55 |
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Congrats on the progress and thanks for the pic.
Lookin' good! |
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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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!
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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.... |
03-08-2007, 12:47 PM | #59 |
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Awesome.
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03-08-2007, 05:57 PM | #60 | |
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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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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...... |
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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10-12-2007, 09:50 PM | #63 |
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Just a few updated pics...
I am still working on them.... |
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. |
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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10-13-2007, 09:07 AM | #66 | |
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Quote:
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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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 |
10-14-2007, 08:00 AM | #68 | |
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10-14-2007, 09:33 AM | #69 |
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10-31-2007, 02:12 PM | #70 |
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great thread. Lots of good info.
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10-31-2007, 02:38 PM | #71 | |
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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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10-31-2007, 07:01 PM | #72 | |
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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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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 |
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 |
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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