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Old 01-15-2009, 05:47 PM   #1
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V6 3.8 or 3.9 or 4.0??

I just bought a 2004 v6 engine for a 1998 Mustang. The details for 2004 listed on this site (or press release) says that 2004 models have 3.8, the 2005 models have a 4.0. I have checked other places and they list both 3.8 and 3.9 engines for sale. What's the difference, what goes to what, and what is the HP ratings? Anyone?


thanks
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Old 01-15-2009, 06:10 PM   #2
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Re: V6 3.8 or 3.9 or 4.0??

The 3.8 and 3.9 are the same engine.

The 4.0 is the new engine put into the S197 platform.

I believe the 3.8/3.9 are rated at 190/195 and the 4.0 is rated at 200/215 or something along those lines.

Factor in drivetrain loss and you're looking at 145-150 at the wheels on the 3.8/3.9 and 160-165 to the wheels on the 4.0.
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Old 01-15-2009, 08:26 PM   #3
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Re: V6 3.8 or 3.9 or 4.0??

yea its no real diff from the 3.8 to the 3.9
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Old 01-16-2009, 12:38 AM   #4
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Re: V6 3.8 or 3.9 or 4.0??

I got a 3.9 everything aftermarket for 99-03 3.8 fits
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Old 01-16-2009, 07:23 AM   #5
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Re: V6 3.8 or 3.9 or 4.0??

Same Here !!!! everything fits on my 3.9
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Old 01-16-2009, 12:19 PM   #6
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Re: V6 3.8 or 3.9 or 4.0??

Factor in drivetrain loss and you're looking at 145-150 at the wheels on the 3.8/3.9 and 160-165 to the wheels on the 4.0.

this car has a 1998 cobra rear end, will there be extra loss or disadvantage?
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Old 01-16-2009, 02:36 PM   #7
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Re: V6 3.8 or 3.9 or 4.0??

Maybe the weight of the IRS might be a factor I sure one of the admin will jump in
So far as drivetrain loss it's about 17% for RWD manual about 20% for auto A good guide is to deduct 12% of the flywheel figure plus another 10 bhp for RWD, All drivetrain combinations have different losses. Anytime someone estimate drivetrain loss, it's from a percentage based on what is similar or common, and never exact. Drivetrain loss is a percentage because of friction and weight
Yeah I know most people say 15% loss for manuals They just leave out the lose starts out at 15%
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Old 01-16-2009, 02:41 PM   #8
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Re: V6 3.8 or 3.9 or 4.0??

There won't be extra loss per se for the IRS, but it will add extra weight. I'm not sure on the exact numbers, but I know the 03/04 cobra IRS is around 100 lbs heavier than the same year solid rear axel. It won't hurt power, but it will slow you about a tenth or so in the 1/4 mile due to the extra weight.
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Old 01-16-2009, 05:09 PM   #9
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Re: V6 3.8 or 3.9 or 4.0??

2004 V6-232ci 3.8L F/I Vin 4
2004 V6-238ci 3.9L F/I Vin 6

there does seem to be a difference, mines bigger mines bigger!!!!
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Old 01-16-2009, 05:44 PM   #10
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Re: V6 3.8 or 3.9 or 4.0??

No, there is no difference in the 3.8L vs the 3.9L. THey are the same engine with some left over windstar parts on it....cam I think.
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Old 01-16-2009, 07:19 PM   #11
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Re: V6 3.8 or 3.9 or 4.0??

The 98 cobra did not have an IRS btw for those that were thinking that. It's a solid 8.8. No extra weight really over the 7.5.
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Old 01-16-2009, 11:58 PM   #12
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Re: V6 3.8 or 3.9 or 4.0??

Bobby Hill: My daddy says the 3.9 is a FoMoCo bastard engine that they only made for 6 months just to use up all the Winstar parts.

Hank Hill: Well Bobby you see, um, uggghhh. I may have spoken a little to soon. It's what they call a tweener.
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Old 01-17-2009, 12:07 AM   #13
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Re: V6 3.8 or 3.9 or 4.0??

Quote:
Originally Posted by Cobra Verde View Post
Bobby Hill: My daddy says the 3.9 is a FoMoCo bastard engine that they only made for 6 months just to use up all the Winstar parts.

Hank Hill: Well Bobby you see, um, uggghhh. I may have spoken a little to soon. It's what they call a tweener.
Lol...pretty much sums it up.
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Old 01-17-2009, 12:29 AM   #14
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Re: V6 3.8 or 3.9 or 4.0??

Correct, the 3.9 has a slight crank variation to it.

Biggest difference is the 3.8L/3.9L cars are OHV pushrod motors, where as the 4.0L is a SOHC motor.


And my 3.8L STOCK dyno'd at 165 hp / 200 tq to the wheels via 5 speed.
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Old 01-17-2009, 11:58 AM   #15
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Re: V6 3.8 or 3.9 or 4.0??

It's just that some of the parts I'm looking for specify not for the 3.9 engine the Computer, Transmission, Headers...
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Old 01-17-2009, 04:05 PM   #16
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Re: V6 3.8 or 3.9 or 4.0??

What kind of parts are you looking for that you can't find? Maybe we can point you in the right direction.
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Old 01-17-2009, 08:01 PM   #17
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Re: V6 3.8 or 3.9 or 4.0??

Transmission, headers and alum. drive shaft.....


The Canadian Essex (90 Degree V) engine was a V6 engine family built by Ford Motor Company in Windsor, Ontario. Unlike the British Essex V6, the Canadian Essex was a 90� design, being derived from the Windsor V8.

The 3.8 L was replaced by a new 3.9 L model in 2004.

Bore was 96.8mm and stroke was 86mm. Output was 140 hp (104 kW) and 215 ft.lbf .

The Mustang version was updated for 1999 with Teflon-coated pistons, a variable length intake manifold, and a more open cylinder head. These bumped output up by 40 hp to 190.

A 3.9 L (238 inł) 12-valve version with 3.8 in (96.5 mm) bore and 3.46 in (87.9 mm) stroke was introduced in 2004. It had a one-year run in the Mustang before it was replaced by the 4.0 L Cologne OHC engine.

Applications:

* 2004 Ford Mustang
* 2004-present Ford Freestar
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Old 01-18-2009, 12:05 AM   #18
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Re: V6 3.8 or 3.9 or 4.0??

headers will not be an issue for the 3.9L you just need to know if you have air injection or not. Agian I have a 3.9L and all my parts i have are for the 3.8L and my exhuast system is for a 4.6L GT
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Old 01-18-2009, 01:44 PM   #19
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Re: V6 3.8 or 3.9 or 4.0??

Thanks Saturn Man that's good to know. I just got a killer deal on a 98 cobra ($500.00) without an engine or transmission. i don't have a car. i bought a 3.9 for under $300 and now i need a transmission to. can anyone suggest a good alum. drive shaft, shifter, headers and a transmission. i will pick up all this stuff this week.
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Old 01-18-2009, 06:28 PM   #20
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Re: V6 3.8 or 3.9 or 4.0??

CV - where did you find those specs for the motors? HP and TQ are wrong. Just a heads up.

For headers, stock manifolds aren't that bad. Ford actually handed those to us made correctly from the factory.
As for Tranny, it's really the bell housing you need to make sure works. Pick a tranny that will fit you needs (T5 is a great starting point), then find the right right bell housing to hold it to the V6. Find a good short throw shifter to match whatever tranny you end up with. Steeda Tri Ax is prefered by a lot of owners. But many are out there to pick from.
DS doesn't matter in regards to engine size.
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Old 01-19-2009, 10:24 AM   #21
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Re: V6 3.8 or 3.9 or 4.0??

Yes, the specs i found on a Canadian web-site did seem different from the other information i have been reading. So I could use a T5 for a V8 but i would just need to find the correct bell housing? and i was checking out the Tri Ax also, i think that's what I'll use. alum., drive shaft is a bit pricey but would the over all length change cause of the mix and match year parts used?

Thanx everyone, i will need help on this one.
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Old 01-19-2009, 11:44 AM   #22
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Re: V6 3.8 or 3.9 or 4.0??

Just find a stock bell housing, T5 and matching drive shaft for the sixer. That way you don't have to worry about mixing and matching years and odd lengths of parts.
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Old 01-19-2009, 01:08 PM   #23
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Re: V6 3.8 or 3.9 or 4.0??

Will this work? MUSTANG TREMEC 3650 TRANSMISSION TR3650. the pictures of the atomatics i've seen look like the bellhousing is part of the casting, i don't see bolts around the housing. This isn't the same for 5 speed i take it. the engine is a 04 3.9.
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Old 01-21-2009, 09:56 AM   #24
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Re: V6 3.8 or 3.9 or 4.0??

It unbolts from the inside on the bell housing.
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Old 01-21-2009, 01:38 PM   #25
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Re: V6 3.8 or 3.9 or 4.0??

Quote:
Originally Posted by LilRoush View Post
CV - where did you find those specs for the motors? HP and TQ are wrong. Just a heads up.

For headers, stock manifolds aren't that bad. Ford actually handed those to us made correctly from the factory.....
I dont think they were made correctly at all. Here they are compared to the stock manifolds



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Old 01-22-2009, 03:04 PM   #26
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Re: V6 3.8 or 3.9 or 4.0??

how about MAC headers they are having a sale. how many extra tubes should be coming off them for smog device or sensors hook ups? CA smog stuff...
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Old 01-22-2009, 06:25 PM   #27
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Re: V6 3.8 or 3.9 or 4.0??

Well to be 100% street legal the device should have a carb eo number
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Old 01-23-2009, 10:43 PM   #28
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Re: V6 3.8 or 3.9 or 4.0??

The ONLY difference between the 3.8 and the 3.9, as said before, was the crank. Ford had a bunch of left over Windstar cranks that they threw in the Mustang to save money. The increased stroke from the crank gets you your .1 liter of displacement. Any and all parts for a 3.8 will fit a 3.9... including the crank.

As for headers, I have MAC headers on my car... and can't really recommend them. They are cheap for a reason... because they are cheaply made.
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Old 01-23-2009, 11:03 PM   #29
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Re: V6 3.8 or 3.9 or 4.0??

I have BBK headers. they do not have CARB EO number but do have all the parts that will make it on a mustang v6 with or with out air injenection
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Old 01-26-2009, 10:19 AM   #30
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Re: V6 3.8 or 3.9 or 4.0??

Now I'm trying to find a cam for this engine. Super six Auto anything and Edelbrock don't have anything, any other places?
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