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deweyOffline
Post subject: fuel injection  PostPosted: Feb 06, 2011 - 04:35 PM
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Location: mobile,alabama
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Trying to down load pics of a injection system i am building

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deweyOffline
Post subject: fuel injection  PostPosted: Feb 07, 2011 - 05:28 PM
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Pics are available. Just take me a while to figure out what i'm doing.

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AdrianBurtonOffline
Post subject: RE: fuel injection  PostPosted: Feb 08, 2011 - 03:24 AM
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put them on flickr

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deweyOffline
Post subject: fuel injection  PostPosted: Feb 08, 2011 - 01:38 PM
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Adrian:
Click on my flicker acct: the pics are there with the fuel injection and
the other headers i made for the SB2,2 heads and the fuel cell just back from powered coat.
When you coming to Mobile?


Dewey

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AdrianBurtonOffline
Post subject: RE: fuel injection  PostPosted: Feb 08, 2011 - 02:08 PM
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Nice, I REALLY like the injector holders, did you make those?

I was thinking of doing something similar with the 12 but I have not gotten that far yet.

I am not sue when I will make the trip that way, my plans have been "adjusted" for me

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wire2Offline
Post subject: Size counts  PostPosted: Mar 24, 2011 - 01:23 AM
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Dewey, nice fabbing skills on the intake.

I can see you may be at the point of no return, however;
be aware that short, fat runners will seriously diminish low rpm torque.
The TPI runners that were on your engine were ~ 18" long, tube + baseplate.

Here's the technical details of a fix;
On many 4 valve engines, at lower rpm they feed a long, smaller runner and block a large, short one to the cylinders. After 4000 rpm they open butterflies in the larger for high flow.

Here's a good example, the Ford(Yamaha) SHO engine;
http://t2.gstatic.com/images?q=tbn:ANd9GcRS85AqUDe0S9QKBEYvwYCahUZ4eKm_tDSvJrtVB2GaEkhq67q9

Chrysler has been doing almost the same thing in their 3.5 V6's since '93.

Your SBC is 2 valve so that design can't be easily adapted but you *can* improve flow by adding short trumpet flares at the runners inside the plenum boxes, to take away some turbulence, a la Weber velocity stacks.

http://www.google.ca/imgres?imgurl=http://chircoestore.com/catalog/images2/51_1blog.jpg&imgrefurl=http://chircoestore.com/wordpress/%3Fp%3D574&usg=__p6ZdpzJn3hpNpJpZIJSSaYW5GFo=&h=420&w=420&sz=51&hl=en&start=155&zoom=1&tbnid=d89y0X3j51GerM:&tbnh=125&tbnw=125&ei=oo2KTbeGIZTh4gbH84niDg&prev=/images%3Fq%3Dweber%2Bcarburetor%26hl%3Den%26biw%3D1680%26bih%3D857%26site%3Dsearch%26tbs%3Disch:10%2C4218&itbs=1&biw=1680&bih=857

You can make them with a 3" length of aluminum tubing on a metal or wood lathe with a roller or polished steel rod pressing outwards , then weld them over the existing box-runner joints.
 
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deweyOffline
Post subject: fuel injection  PostPosted: Mar 24, 2011 - 11:19 PM
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Hey Wire Man,
Thanks for the encouraging comment , with a build like this we all need a little every now and then. You right about the runners and the pelnum , the finite and amplitute pressure wave don't react like we would have them to. But that is why we have all the engine programs on the computer but even then we still have to R&D on the dyno to tell it all.
We are building 3 engines , one for a top end run hopefully. one for the street an one for whatever. Check out the headers i built , click on my flicker. Get back to me.



Thanks Dewey

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wire2Offline
Post subject: RE: fuel injection  PostPosted: Mar 25, 2011 - 06:21 AM
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Yes, I've seen your headers, Dewey, we PM'd several months ago when you were "experimenting" and I was learning from you. Your latest set are going to sound great.
Had you considered adding an H pipe between the 2 collectors? Even a 1" pipe will help flow, 2" would be better yet.

The ultimate (from a purely physics standpoint) would be 8 into 1, to fill in all the gaps between firings. It also sounds less "musclecar", more "exotic". Someone on here has done it, the sound clip was amazing.
 
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