#66539 - 09/28/11 04:58 PM
Re: How many injectors??? Why 6?
[Re: copo-rat]
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tlowe #1716
12 PORT ADVERTISER
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Registered: 04/01/04
Posts: 2326
Loc: Dysart, Iowa
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Small injectors will be easier to control when the fuel demand is small (ie: idle).
Don't forget about the fuel charge robbing issue when doing port fuel injection. You may have better luck putting the injectors further upstream in the intake. Tom
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#66560 - 09/29/11 05:16 AM
Re: How many injectors??? Why 6?
[Re: THE FRENCHTOWN FLYER]
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copo-rat
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Registered: 04/03/10
Posts: 103
Loc: SE Indiana
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Why do you think one for two cylinders would be better?
French, I don't necessarily think that one injector per runner will be better, just curious as to why it couldn't work 'as good' as 2 injectors per runner. I have a much better understanding of this after the info that has been given via this thread, and I'm sticking with two injectors per runner. I was unaware of the valve events between certain shared cylinders that cause a 'fuel robbing issue'. I still believe it can be done, but I'm not willing to try it and it's a street motor that I can't have huge injectors in, causing idle and low speed problems. Thanks a ton for your info, it is greatly appreciated!
_________________________
".....don't give up a TURBO more than makes up for all of this BS." Turbo-6
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#66636 - 10/05/11 12:21 PM
Re: How many injectors??? Why 6?
[Re: THE FRENCHTOWN FLYER]
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copo-rat
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Registered: 04/03/10
Posts: 103
Loc: SE Indiana
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#66638 - 10/05/11 01:28 PM
Re: How many injectors??? Why 6?
[Re: copo-rat]
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tlowe #1716
12 PORT ADVERTISER
Active BB Member
  
Registered: 04/01/04
Posts: 2326
Loc: Dysart, Iowa
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Nice! That looks so much like mine, but cleaner and nicer.
What Throttle body you using?
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#66643 - 10/05/11 06:34 PM
Re: How many injectors??? Why 6?
[Re: copo-rat]
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tlowe #1716
12 PORT ADVERTISER
Active BB Member
  
Registered: 04/01/04
Posts: 2326
Loc: Dysart, Iowa
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I believe the ribs are there to add heat to the fuel that would puddle in the intake with a carb. A turbocharged engine has plenty of intake heat will under boost. If it is easy, smooth them.
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#66646 - 10/05/11 07:52 PM
Re: How many injectors??? Why 6?
[Re: copo-rat]
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tlowe #1716
12 PORT ADVERTISER
Active BB Member
  
Registered: 04/01/04
Posts: 2326
Loc: Dysart, Iowa
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It's nice to have a mill at your disposal when needed.
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#66667 - 10/07/11 03:14 AM
Re: How many injectors??? Why 6?
[Re: copo-rat]
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Twisted6 I.I #3220
Lump Port head builder
Active BB Member

Registered: 07/04/00
Posts: 3833
Loc: EdgeWater FL. USA I.I. # 3220
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Thanks Tom, much appreciated. There are several on here that I highly value the opinions of, and you are one (my signature is a quote from another). I used yours as a guide and you have helped along the way. The throttle body is from an '08 Trailblazer (4200). I'm going to use ALL the electronics from that vehicle. Working on the cam and crank reluctors now. Once that is figured out it should be 'game on'! Does anyone have any opinions on whether or not I should 'smooth' the ribs in the floor of the intake or not? Injected, turbocharged 250. Will the fact that it is under boost negate any ill effects the ribs would have? Thoughts?
Reach in and take out the first 3rows from side to side,The ribs were there to help channle the fuel to the end runners and they worked a little to well and would lean out the center two cyl.I have done this to many of those intakes.
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Larry/Twisted6 #3220 }[oooooo]  Adding CFM adds boost  God doesn't like ugly.
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#66708 - 10/09/11 08:48 AM
Re: How many injectors??? Why 6?
[Re: Nexxussian]
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copo-rat
Active BB Member
Registered: 04/03/10
Posts: 103
Loc: SE Indiana
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I agree with Hank on that (shouldn't be an issue, unless it's way further up there than it looks in the pics).
If I read it right you are going to cut the bungs shorter than they appear in the picture (the one with the injector and fuel rail).
Are you going to match those to the ceiling of the runner, or are you planning to leave some of the bung hanging below into the airstream (attempt at airflow direction, or turbulence generation for better atomization perhaps?)?
Hank, Larry - thanks for the info! I will most likey remove all the ribs from the bottom of the intake.
Nexx, The bungs are trimmed and are tacked in flush with the ceiling of the runner. I just don't have any pics of that yet. I'm not leaving them protrude into the runner at all. I'm actually having them welded in (by a good friend/co-worker) on the inside and then I will clean up the welds and smooth it all out. We decided to not weld the bungs on the outside just to keep it cleaner looking. I'll post more pics hopefully early next week when we have more progress. We have a tiny interference issue with the fuel rail and TB and TB adapter. Not tiny enough to be ignored. I'm contemplating my options: Mill the 'carb' mounting flange flat (as it is on an angle currently) and gain some clearance, mill the bungs a little shorter to get the rail farther away from the TB and adapter, mill the TB, TB adapter and back of the rail to gain the clearance needed. I originally wanted to remove the angle from the mounting face of the intake and gain the clearance that way, but I don't want to try to drill deeper and tap the holes afterward as two of them would be left too short to use. Don't want to use heli-coils either. Just have to weigh the options. Quickest option would be nice, but I don't want to be hasty and make a decision I'll regret!
_________________________
".....don't give up a TURBO more than makes up for all of this BS." Turbo-6
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#68453 - 02/05/12 06:04 PM
Re: How many injectors??? Why 6?
[Re: Nexxussian]
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copo-rat
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Registered: 04/03/10
Posts: 103
Loc: SE Indiana
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#70968 - 08/02/12 09:03 PM
Re: How many injectors??? Why 6?
[Re: efi-diy]
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Riveted1
Bulletin Board Only Member
Registered: 06/17/12
Posts: 2
Loc: Arizona
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What ever happened to this? I was enjoying the read
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