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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Carb opinions 540's 700 hp... (https://www.offshoreonly.com/forums/general-q/324176-carb-opinions-540s-700-hp.html)

Rookie 03-21-2015 01:55 PM
Originally Posted by sutphen 30 (Post 4282022)
depending on air flow into the cylinders,,the efi port injected afr will be more even.if you have an innovate lm series afr meter,it reads so fast that you could almost see the individual cylinders firing and get an idea as to whats going on.then of course,back it up w/ a plug reading.
That makes perfect sense. I do have a LM1 and I do notice the individual AFR's. Obviously with a carb my hands are tied, but with port injection just keep adjusting till it all levels out. I think I'm going to start piecing my EFI system together soon.

sutphen 30 03-21-2015 02:19 PM
Originally Posted by Rookie (Post 4282039)
That makes perfect sense. I do have a LM1 and I do notice the individual AFR's. Obviously with a carb my hands are tied, but with port injection just keep adjusting till it all levels out. I think I'm going to start piecing my EFI system together soon.
whats really nice w/ the newer systems is the individual cylinder control of fuel and spark.
next big break thru will be 8 individual o2 sensors.Back in 1986,I asked John Meaney to give me feedback control of the o2 sensors.said the hips didn't have enough computing power.I had serial #1&#3 ecu's from dfi.Still have it in plastic after an idle contol upgrade using the variable timing on the engine.what everyone takes for granted now.:)boy those were the days.

Rookie 03-21-2015 03:40 PM
Originally Posted by sutphen 30 (Post 4282044)
whats really nice w/ the newer systems is the individual cylinder control of fuel and spark.
You still need ignition boxes with the new EFI setups, right? It won't eliminate my Crane HI-6M's.

sutphen 30 03-21-2015 03:53 PM
Originally Posted by Rookie (Post 4282061)
You still need ignition boxes with the new EFI setups, right? It won't eliminate my Crane HI-6M's.
you can use the box w/ distributor and a single coil.or,you ditch that old stuff for COP(coil on plug) set up.

BenPerfected 03-21-2015 04:21 PM
Originally Posted by Rookie (Post 4282061)
You still need ignition boxes with the new EFI setups, right? It won't eliminate my Crane HI-6M's.
If you decide to switch ignitions, I would likely buy your Crane 6M's boxes as back-ups.....I'm too old to switch

SB 03-21-2015 04:40 PM
The box has a setting for o advance (lock out) so, you'll be fine.

Rookie 03-21-2015 05:02 PM
Originally Posted by SB (Post 4282084)
The box has a setting for o advance (lock out) so, you'll be fine.
Yeah, I run them locked out at 35° and pull 8° with their knock retard. I don't believe I have had any detonation, it just makes me feel safe.

Rookie 03-21-2015 05:03 PM
Originally Posted by BenPerfected (Post 4282076)
If you decide to switch ignitions, I would likely buy your Crane 6M's boxes as back-ups.....I'm too old to switch
No problem, you will be first on the list if I go a different direction.

SB 03-21-2015 05:09 PM
Originally Posted by Rookie (Post 4282091)
No problem, you will be first on the list if I go a different direction.
Don't use a Dominator size (1050 cfm) or larger throttle body. LOL. :D

abones 03-21-2015 05:33 PM
Originally Posted by SB (Post 4282097)
Don't use a Dominator size (1050 cfm) or larger throttle body. LOL. :D
How in the heck did I ever get by for years with custom built 1071s on my NA 502s? Might have to do with volumetric efficiency, and boost venture sizing.


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