injector fireing order
Thread Starter
Drifting
Joined: Dec 2001
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From: providence ut
injector fireing order
I just read a responce to a post that said that early c-4's fire the injectors one bank of 4 at a time??????? dam I was going to siamese my manifold and it wouldn't work if this is true. I have an early 85. :confused:
Drifting
Joined: Mar 1999
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From: Norcross GA
Re: injector fireing order (lead foot 85 vet)
It's true,.... TPI is batch fired. Right bank, left bank, right bank,......
All 4 injectors per bank are wired in parallel.
Single injecor fire per cyl is called sequential fired system,..... that came in later years.
Siamese runners or intake on a TPI,... why would this not work for you? Your not gonna siamese the left and right bank,.. right?
All 4 injectors per bank are wired in parallel.
Single injecor fire per cyl is called sequential fired system,..... that came in later years.
Siamese runners or intake on a TPI,... why would this not work for you? Your not gonna siamese the left and right bank,.. right?
Thread Starter
Drifting
Joined: Dec 2001
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From: providence ut
Re: injector fireing order (ZylaRace)
It just seems that one cylinder could pull fuel from the port next to it then I'd have one rich and one lean cylinder..............am I thinking right? I had know idea the injectors fired in banks. now I'm taking about siameseing the intake manafold.
Team Owner
Joined: Dec 2000
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From: SE NY
Cruise-In II Veteran
Re: injector fireing order (lead foot 85 vet)
Remember that the runners within the TPI intake base are still about 6" long even after a 1"-2" siamese cut.
Though the air within a TPI intake runner is pulsing, the air flow when the valve opens is still down the pair of runners into the siamesed base. If you do the siamese cut down to the head port there might be an issue, but I don't think it is a problem with a few inches of siamese cut.
Check out the before/after dyno pulls along with my siamese method on my site, link in sig. below.
Though the air within a TPI intake runner is pulsing, the air flow when the valve opens is still down the pair of runners into the siamesed base. If you do the siamese cut down to the head port there might be an issue, but I don't think it is a problem with a few inches of siamese cut.
Check out the before/after dyno pulls along with my siamese method on my site, link in sig. below.
Le Mans Master
Joined: Jun 2002
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From: High Plains Drifter Fayetteville, AR
Re: injector fireing order (lead foot 85 vet)
You want to siamise the upper portion of the runners, where the tubes bolt onto the lower manifold. If you siamised the lower portion of the runners, you would run into the problem you describe and a whole host of others.
Thread Starter
Drifting
Joined: Dec 2001
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From: providence ut
Re: injector fireing order (65Z01)
ya I hear you.... it'll work.... BUT I think it'll work better on a lt-1. I've got a spare manifold and I'm replaceing my heads so I'll try it ...............I was real excided after reading madmax's dyno's.............no bottom end loss and a 40 hp gain. for nothing but time spent on the manifold.........thats as good as mini or super rams. the problem is I'm supercharged now and a lean cylinder could be worse for me.
