1993 4.3l OMC Four Winns 180 Freedom stock cam specs? stock max torque?

[inlinewhine]

I have a 1993 Four Winns Freedom 180 with a 4.3l OMC Cobra drive. I'm equipped with the 175 HP 2-barrel version. Does anyone know how much torque this engine is putting out and at what rpm? What is the part number on the camshaft, specifications, and is there a performance cam which will increase torque with out risk of water injestion? I'm also planning on edelbrock 2114 intake and edelbrock 1409 4-barrel Carb. Any help with the stock: torque, cam specs, and aftermarket options. I want more grunt while keeping the 21 pitch prop and 4.3l engine.

 

[180shabah]

Re: 1993 4.3l OMC Four Winns 180 Freedom stock cam specs? stock max torque?

the 2114 won't work on your engine unless either the heads have already been replaced or you plan on swapping them with vortecs as part of the "upgrade".

With the old style heads there is very little room for cam upgrades before reversion starts, with vortec heads - stick with the stock cam. Best path for power and reliability on your 4.3 would be vortec heads, DO NOT change the cam, 2144 intake with 4bbl carb on it. This should net you 210-215hp at the prop. This is a huge gain over the 145-150 (your 175 is a crank rating) you have now, but will require a prop and or gear ratio change. It will make very little if any improvement on your holeshot.

Prop changes, trim tabs, even a tune up could help, but we need to know what your actual goals are. More grunt just isn't diagnostically relavent. Do you want faster acceleration from a standstill, higher top speed, abiltity to hold plane at a lower speed? What are your current WOT numbers?

 

[Bondo]

Re: 1993 4.3l OMC Four Winns 180 Freedom stock cam specs? stock max torque?

Ayuh,... I agree with 180,....
Go with a 4bbl. Carb,+ forget about changing the cam...

 

[inlinewhine]

Re: 1993 4.3l OMC Four Winns 180 Freedom stock cam specs? stock max torque?

the 2114 won't work on your engine unless either the heads have already been replaced or you plan on swapping them with vortecs as part of the "upgrade".

With the old style heads there is very little room for cam upgrades before reversion starts, with vortec heads - stick with the stock cam. Best path for power and reliability on your 4.3 would be vortec heads, DO NOT change the cam, 2144 intake with 4bbl carb on it. This should net you 210-215hp at the prop. This is a huge gain over the 145-150 (your 175 is a crank rating) you have now, but will require a prop and or gear ratio change. It will make very little if any improvement on your holeshot.

Prop changes, trim tabs, even a tune up could help, but we need to know what your actual goals are. More grunt just isn't diagnostically relavent. Do you want faster acceleration from a standstill, higher top speed, abiltity to hold plane at a lower speed? What are your current WOT numbers?

Wait a minute I might be new to this site but I'm definitely not new to engines.

1. Regardless as to what summitracing.com or whom ever says so according to Edelbrock.com and exactly http://www.edelbrock.com/automotive_new/misc/company/10pdf/56-57.pdf which states the Edelbrock 2114 intake "can be used on vortec blocks or 1995 and earlier blocks" the term vortec was used on e gm 1988 and later engines; in 1996 the heads were re-designed with a vortec style head. I was just going off of the manufacturers guidelines of this product.

2. Also, I cannot find any information regarding a 2144 intake, this intake does not exist... did you mean an Edelbrock 2111 intake? This intake was designed to fit the street and marine 4.3l engines up to 1995 and is clearly stated will fit.

3.Thou I'm not concerned about hp numbers as much as torque numbers in a boat but 210-215 prop hp seems un-realistic. Like you said 145-150 prop hp in stock form, so you?re suggesting a 60-70 hp improvement over stock just by adding a 4-barrel carb and new intake? Edelbrock.com http://www.edelbrock.com/automotive_new/mc/manifolds/chevy/performer-v6.shtml also dyno tested a 4.3L marine with Edelbrock 2111 intake and 1404 carb and headers which dyno'd 202hp at the crank. This is only a 27 hp increase even with headers; mine would only be 172-177hp max but probably less do to the marine manifolds. But like my original post I'm only concerned about the increase in torque compared to factory. The whole point of the post was to get factory torque numbers as a baseline.

My goal is to pull a wake boarder out of the water with a 21p prop with more ease. Smart tabs will help the boat plane but aren?t' exactly ideal for creating wake. Also my theory was that the 21p prop or higher should keep the WOT numbers in check.

So priced out a 2111 intake 1409 carb, 1485 calibration kit. All the bolts and gaskets etc... about $600 in parts for a ~27hp gain and most likely a similar gain in torque. Is it worth it? For me, I know the history of the boat, so yes it?s worth it.

 

[Lou C]

Re: 1993 4.3l OMC Four Winns 180 Freedom stock cam specs? stock max torque?

I have an original '88 OMC 4.3 V-6 with the 4bbl Rochester...it was rated at 205 hp (at the crank I am assuming) and based on the specs in the Four Winns site it's probably 180 at the crank (most of their IOs seem to drop about 25 hp when going from crank to prop ratings)...I agree in that adding the 4bbl manifold and carb is probably the only easy and relatively fool proof way of increasing performance on this engine...changing the cam you'd also have to replace all the lifters...etc...and you have to be careful because high overlap cams can pull water back in thru the ex system and cause rusting of ex valves....

the 4bbl on the little 4.3 performs very well...you can definitely feel when the secondaries open up....

 

[180shabah]

Re: 1993 4.3l OMC Four Winns 180 Freedom stock cam specs? stock max torque?

First, yes I meant 2114 (which can only be used on '95 and earlier blocks IF you swap the heads) not 2144. The 2111 will fit your current setup and as you pointed out will provide a marginal power increase.

Second - 210-215php is very realistic, most of that power increase comes from heads, not the intake and carb. There is no magic to it. A 2bbl vortec(nobody cares about the 87-95 vortec name, get the '96+ heads) 4.3 makes 190 hp at the prop, bone stock, and yes, a good intake with 4bbl carb will improve on that.

As for getting the factory torque figures, Merc, VP and OMC have NEVER published them. They also have not published any cam specs for thier engines. Estimated torque baseline, figure about 250 peak around 3000rpm and no less than 200 from just off idle all the way to redline. Current MPI version peaks at 275 ft/lbs at 3800 and never dips below 230. I would not expect to gain more than 12-15 ft/lbs with the intake and carb without upgrading the heads also.

If you goal is pulling power, you really need to be looking in to a different prop more than additional power. You will get MUCH more bang for your buck. Not that I am against increasing power, but I think you will be dissappointed after dropping the $600 on parts.

FWIW - if you do get the carb, skip the 1485 calibration kit, get the generic track tuning kit(don't have the number handy). It has an assortment so you can tune it to YOUR engine instead of the one THEY tested with.

 

[zbnutcase]

Re: 1993 4.3l OMC Four Winns 180 Freedom stock cam specs? stock max torque?

The stock cam is GM P/N 10134321, lift .450 intake, .460 exhaust, duration 224deg, lobe C/L 112deg. 'nutcase