injected sixpack
#599442
01/31/10 10:54 AM
01/31/10 10:54 AM
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Joined: Feb 2008
Posts: 65 Solon, Oh
Convertible Bee
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Solon, Oh
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Some photos of a sixpack injection I'm building for my 69 a-12 clone convertible. Using mega squirt for the ecu, controls the timing and injectors. file:
Last edited by Convertible Bee; 01/31/10 10:57 AM.
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Re: injected sixpack
[Re: Convertible Bee]
#599443
01/31/10 01:08 PM
01/31/10 01:08 PM
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Joined: Mar 2004
Posts: 2,963 Wisconsin
Stewpar
master
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master
Joined: Mar 2004
Posts: 2,963
Wisconsin
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What intake are you running? More pictures please!
Admiration For Multiple Carburetor Vehicles...
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Re: injected sixpack
[Re: Convertible Bee]
#599450
02/27/10 03:34 PM
02/27/10 03:34 PM
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Joined: Feb 2008
Posts: 65 Solon, Oh
Convertible Bee
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Solon, Oh
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A picture of some machining I've done this week. More to follow.
Last edited by Convertible Bee; 02/27/10 03:36 PM.
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Re: injected sixpack
[Re: Convertible Bee]
#599451
02/27/10 05:10 PM
02/27/10 05:10 PM
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Joined: Jan 2003
Posts: 1,240 Saline, MI
efisixpack
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,240
Saline, MI
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Looks good! Looks like you took the same approach I did when I built mine. I like the fact they look to be approximately the same height as factory carbs. It will look a lot better that way IMO. Question for ya, what size throttle blades did you go with and what CFM do you estimate?
When I die I want to go like my Grandfather did, quietly in his sleep. Not screaming like the passengers in his car.
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Re: injected sixpack
[Re: efisixpack]
#599453
02/28/10 10:15 AM
02/28/10 10:15 AM
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Joined: Feb 2008
Posts: 65 Solon, Oh
Convertible Bee
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Sweet looking setup efisixpack,how's your car perform with it? what size injectors are you running? I'm starting with 6, 50lb injectors. The plates I'm using are from a holley 600 (300cfm), so 900 total my guess.I don't feel this is correct because of the the throttle bodies use straight and carbs use venturis to draw fuel, probably will flow more when I'm done machining lead in velocity stacks. I know machining on the edge of the vice isn't good, just needed some room for the electric connectors,small details that keep things from working. All fits now.
Last edited by Convertible Bee; 02/28/10 10:26 AM.
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Re: injected sixpack
[Re: Commando1]
#599456
03/02/10 08:59 PM
03/02/10 08:59 PM
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Joined: Jan 2003
Posts: 1,240 Saline, MI
efisixpack
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,240
Saline, MI
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Bee - Your set-up looks great. I like the way you are hiding the injectors too. As for sizing, I went with 36# because it's a pretty mild motor. The system has worked great for a long time now but I really need to update the cam to one better suited for efi. I built the system 10 years ago, finally finished the car late 2003 (it's getting antiquated lol) and now I'm playing around with a slight redesign. Nothing fancy, just smaller throttle blades (I have 1-3/4" now) and I want to adapt a different TPS. If you have any questions or are looking for any tips feel free to ask. I'll do my best to help if you need any. As for the ECU I'm using, I started off with an Electromotive Tech II but upgraded to a Gen VII several years ago. I'm really interested to see how the megasquirt works out for you. Please keep me posted! P.S. - I wish I had your machining skills
When I die I want to go like my Grandfather did, quietly in his sleep. Not screaming like the passengers in his car.
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Re: injected sixpack
[Re: sixpackgut]
#599457
03/03/10 01:10 PM
03/03/10 01:10 PM
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Joined: Jan 2003
Posts: 634 USA
Slider
super gas
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super gas
Joined: Jan 2003
Posts: 634
USA
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Quote:
both of those setups look very nice.
But, I have a question. I have been trying to learn as much as I can about EFI setups, and ran across the following from Richard Nedbal (after someone here posted a link to it, sorry I forgot who):
"Now there are several types of EFI but I’m only going to discuss direct port injection - meaning injectors mounted right at the intake valve. Injectors mounted where the carburetor would be are not much better than a well-tuned carb so those systems will be ignored. With electronic port fuel injection you place the injectors right at the intake valve."
...when I read that, I interpreted it to mean multiple throttle bodies are not a good idea. I wanted to use 3 throttle bodies (3 x 2, side draught on a straight 6 cylinder), but when I read that, I started wondering if it was a good idea.
efi, I noticed your injectors are positioned over the intake valvues, like he suggested. Have you had any trouble with your setup? What kind of improvement did you realize going to EFI?
bee, since it looks like your injectors are more traditionally positioned like mine would be (i.e. carb~ish), do you anticipate any trouble witht he setup, versus mounting them more like efi did?
Not trying to start or debate anything. Just trying to learn. Thanks!
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Re: injected sixpack
[Re: Slider]
#599458
03/03/10 01:25 PM
03/03/10 01:25 PM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
Injectors mounted where the carburetor would be are not much better than a well-tuned carb so those systems will be ignored.
Ignore that line. Throttle body efi is still going to offer better driveability than a carb. WOT performance and cylinder to cylinder a/f variation being the downside of any wet flow intake will still be the same as with a carb, which is why port efi is generally considered better. A throttle body efi system can still be much more precisely tuned than a carb, but you do give up the benefits of port efi. But with an intake like a 6-pack, which is noted for having cylinder to cylinder air flow differences between intake runners, and seeing the intake was designed for wet flow, a throttle body system is just as good of a choice for it. The OEm produced throttle body efi cars for years and they did well, often putting out slightly more power than their carbed counterparts. Not that the 80's/early 90's was exactly a hi-po era...
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Re: injected sixpack
[Re: DaytonaTurbo]
#599460
03/03/10 08:59 PM
03/03/10 08:59 PM
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Joined: Feb 2008
Posts: 65 Solon, Oh
Convertible Bee
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Solon, Oh
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I'm going to agree with DaytonaTurbo about the wet manifold vs a port injection, the tbi setup I'm building I have no doubt will be more consistent in performance than the holleys that are currently on my car. Starting has been an issue on a cold day or very hot one fuel would boil in the bowls.(I guess I should have known better than to use a tri power off a 68 vette.) As far as Sliders Q, no mechanical problems are anticipated, my issues will be with fuel mapping and the spark curve. I will be asking for help when it's time to start mapping. Here's a pic of the setup with the end tbi with pressure regulator and gauge installed. will try to machine the top lead-in and air cleaner stud bosses next week.
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