Carb v EFI

[schofield]

Hi,
   I need some advice which fuel system Carb or EFI to use on a fully recon chev 350 for my Jet 83-3 stage 770 series. I have been looking at going the EFI way. I need some advice please.

[swifty]

Go efi more power better economy.  B))TWill cost abit more to set up efi pump,computer etc

[mohawk]

Go efi more power better economy.  B))TWill cost abit more to set up efi pump,computer etc

More power    Any extra power (If any ) you would never notice in a boat that size.
Go carb and pointless ignition or good quality HEI.  Cheap and reliable. 

[sambo]

 if you have the coin go efi  .  engine will run much better and yes will have  more power  and use less fuel . buy far the best way to go .

[PM]

Here we go again...

Please explain how an engine makes more power by supplying the SAME amount of fuel to the SAME pistons to spin the SAME crank?

[mohawk]

Here we go again...

Please explain how an engine makes more power by supplying the SAME amount of fuel to the SAME pistons to spin the SAME crank?

and uses the same amount of gas, but more economicaly  

[sambo]

 more advanced  ignition mapping ,   more precise fuel metering, being able to fire atomised fuel dirctly into a port,   makes all the differnce .     if it didnt    all the worlds engine manufactures just wasted 25years of multi million dollar reserch and devoplment for nothing ?hmm   how many engines have carbs these days . .

 yes you can make good power witha carb   and a electronic dizzy.   but if you want   your engine to run to is potential at all rpms and most efficently you need to go to EFI . 

[PM]

more advanced  ignition mapping ,   more precise fuel metering, being able to fire atomised fuel dirctly into a port,   makes all the differnce .     if it didnt    all the worlds engine manufactures just wasted 25years of multi million dollar reserch and devoplment for nothing ?hmm   how many engines have carbs these days . .

 yes you can make good power witha carb   and a electronic dizzy.   but if you want   your engine to run to is potential at all rpms and most efficently you need to go to EFI .  

All done to meet emissions standards over time, and most done with the O2 sensor in a closed loop circuit. First thing that gets done in a boat is to a$$hole the O2 sensor and run an open loop circuit. Besides, the ECU mostly ignores the O2 sensor after about 50% throttle anyway.

A well tuned and maintained carb will make as much power and be as efficent as an injected system, particuarly at the throttle percentages we run in a boat...

Makes you wonder why GM LS2's and LS3's make more power out of the crate with a carb than with the EFI setup.
EFI LS2 = 400hp, (Carb) LS364 = 440hp
EFI LS3 = 480hp, (Carb) LS376 = 515hp

[Brendan]

here is something all the EFI poeple out there have forgotten, a carb will always give better torque delivery due to the fact that there is better airspeed through the carb. and once a carb is set it will not go out of tune unless you get dirty fuel. my 

[mohawk]

Right, enough said , Put this on   http://www.nzjetboating.com/yabbse/index.php?topic=21323.0  and start a new topic 

[Brendan]

Right, enough said , Put this on   http://www.nzjetboating.com/yabbse/index.php?topic=21323.0  and start a new topic 

right on yeah that will  any EFI setup 

[Eddie]

I found this article on the net, it seems pretty balanced and relevant to a 350 Chev.

There are definitely benefits to both but for that motor, why not just stick a carb on and be done?

"As expected, the carbureted intake produced much more peak power, offering a gain of over 50 hp out near 5,500 rpm. But down low, the TPI reigned supreme, generating better numbers from 2,500 rpm to 4,300 rpm. It all boils down to where you want your power-down low or up top-and how much of an emphasis you place on the TPI's superior fuel economy and visual appeal."

- http://www.vetteweb.com/tech/vemp_0607_l98_engine_induction_system/index.html

[wildrj]

Here we go again...

Please explain how an engine makes more power by supplying the SAME amount of fuel to the SAME pistons to spin the SAME crank?

Strap yourself in Perron- this could get ugly!
My philosophy is that I can swap a carby or distributor in 10 minutes but I can't diagnose or fix an EFI system, and neither can any-one else for miles around here.

[Brendan]

try this one, you can tune a carb and dissy setup with a hand full of tools but an efi setup needs wait for it, a Laptop 

[mohawk]

You can also fix a carb on the side of the river or find one that works almost any where in the country ,just by making a few phone calls. Thats real handy for guys like me who's mechanical knowledge is limited to the groin area