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Discussion Starter #1
I was thinking about 3.8l single port intake options , meaning either spend a lot of $$$ or come up with something crazy. So I got this hair-brain idea. Not thinking of using this Trick flow 4.6l plenum but making something similar to it. Any thought input or just a waste of time?
 

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Discussion Starter #4 (Edited)
Yep I agree it was one of those bath room brain storm moments,lol. I'm most likely going to get another plenum and shorten the runners 1.5" and port match it and save a lot of money by not going with Morana Or I had had a thought of converting a CFI intake to a 4.6l throttle body w/ elbow and port matching it that would be pretty easy especially since the injectors are in the head . Just planning ahead for the 4.2l and staying single port.
 

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Aside from the lack of runners that will kill what little torque you have, the SC intake is not a good flowing design and will be restrictive at the top end as well. It was basically designed to be able to bolt the supercharger to it and fit everything under a stock hood, and flow/performance was not even really a consideration.
 

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Aside from the lack of runners that will kill what little torque you have, the SC intake is not a good flowing design and will be restrictive at the top end as well. It was basically designed to be able to bolt the supercharger to it and fit everything under a stock hood, and flow/performance was not even really a consideration.
If the hood is swapped out with a cowl type hood, are there aftermarket intake runners that would offer better performance for the 3.8?
 

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If the hood is swapped out with a cowl type hood, are there aftermarket intake runners that would offer better performance for the 3.8?
96-98 Windstar Intake! Of course, that would require splitport lower intake and heads.


You could also fabricate something by welding vertical pipes to your lower intake manifold, adding flutes to the end, and building a box around it for the throttle body to mount. Some lemons folks have done that using an ammo can.
I thought about such an idea for the 3.8 and then the buzz wore off.


-g

PS. I'm not sure why spending all the effort on a singleport setup is a good idea of you are planning to move to a 4.2L, Jhiland. After all, most 4.2L setups are splitport.
That being said, I'll be happy to sell you a singleport 3.8L upper intake and/or SC lower intake manifold if you want to chop/weld something up. Who am I to stand in the way of your projects?
 

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Discussion Starter #8
I'm staying single port for this build split port is good, but not in my plans. Morana offers a shorten version of the stock plenum for $500.00 so I'm just going to cut, polish ,and tig my own.
 

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should work well with 6 turbos
 

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But why? Whats the outcome supposed to be, just different? Im all about different but it sounds like your going out of your way. $500 to cut up a manifold for a 3.8 is nuts. Wish you all the luck.
 

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Discussion Starter #12
I'm not paying $500 to do anything. That what Morana gets. I'm doing it my self. Shortening the runners on the 3.8 plenum improves mid- range torque and respond something a 3.8 lacks anyway this would be for my 4.2 build anyway.
 

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I'm not paying $500 to do anything. That what Morana gets. I'm doing it my self. Shortening the runners on the 3.8 plenum improves mid- range torque and respond something a 3.8 lacks anyway this would be for my 4.2 build anyway.
Again, "but why"?
The reason all of us are confused is because there seems to be a disconnect here. Let's look at the facts

* From all I read, all the singleport modifications were made before splitport heads/intake manifolds emerged on the market. SP heads flow something like 2x better than their singleport ancestors.

* Since it's commonly known that 14# injectors are pretty well maxed out with a singleport 3.8L engine (do the math), you'll need upgraded injectors with the 4.2L. I'm not sure how much viable "carry-over" you are planning in your eventual migration to the 4.2L block.

* If the concern is cost, I know for a fact that splitport heads can be picked up for <$100 a pair along with the matching lower/upper intake manifolds.

* A fancy singleport upper intake will only be compatible with a singleport lower itnake and heads.

If you are planning to go with a 4.2L shortblock, the natural choice would be a splitport heads/intake setup.

The only reason to consider singleport heads would be if you were planning on making a 4.2L SC setup using the stock SC intake manifolds. While that might be the cheapest route to a 4.2L SC setup, the flow capabilities of the SP heads/intake make a vortech SC setup much higher performing (at least, until your block blows up because you didn't start with a SC block). In this scenario, you could reuse your stock singleport heads but your fancy shortened singleport intake will be just a large paperweight.

Bottom Line:
* If you have the skills and/or determination to cut, shorten, polish, and re-tig a singleport upper intake, you are better off investing the similar effort in a splitport upper intake. You'll get far more performance going that direction.

The only conceivable reason I could see to invest the time/effort in doing a cut and weld job on your existing 3.8L manifold would be for practice. Of course, if you @#[email protected]#$ up, how are you going to drive to work? Now, if you are planning to buy a spare intake for practice, why not buy a spare splitport upper intake instead of a singleport one?


PS. A good correlary to this situation I've seen recently is with 5.0L heads. Unless you are restricted by some racing series rules, there is no reason to invest significant labor (beyond a simple polish/gasket match job) on iron 5.0 heads anymore now that cheap, high performance aluminum castings are available. It's the march of technology....


-g
 

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Discussion Starter #14
I'm not building a super hot rod with a V6 just a little more power. When I go to the 4.2 I will be upgrading to 19# injectors, and 3.8 plenums are a dime a dozen. I'll most likely just build a stock 4.2 with the single port heads and stock intake.
The hole hair brain thing was just a simple little idea that I didn't think would work anyway.
Yes the split-port is a thought but not what I want to build. If I was going for high HP I would get a 4.6 2v Bird/Coug or slip in a 4v.
Heres something you didn't think about the fastest V6 lately belongs to Matt Neuharth of Lebanon ,TN. His SN95 went [email protected] mph with a stock 4.2 block with forged internals and ....single port heads... tons of boost to make 600 RWHP. (http://www.musclemustangfastfords.com/features/mmfp_0708_1995_ford_mustang_turbo_v6/viewall.html).
I'm not trying or wanting to build anything like this. My 3.8 has about 145-150 hp if I can get a 4.2 up to 190-200 hp I would be pleased. And yes I know how to tig.
 

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My 3.8 has about 145-150 hp if I can get a 4.2 up to 190-200 hp I would be pleased. And yes I know how to tig.
Just an FYI, a bone stock split-port 3.8 is rated at 190hp, and a bone stock split-port 4.2 is rated between 202-210 depending on the year. I'm all for trying different paths to more horsepower, but from what you said your horsepower goals are, that really is the cheapest and easiest way. Buy a complete 4.2 split port motor, dont even remove the lower intake manifold, it will bolt right in place and you will need to extend some wires and hoses and get a tune, and you are done. No cutting or tig welding, no porting, no custom parts, no adapting different plenums or throttle bodies, just bolt it in and go.
 

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Just an FYI, a bone stock split-port 3.8 is rated at 190hp, and a bone stock split-port 4.2 is rated between 202-210 depending on the year. I'm all for trying different paths to more horsepower, but from what you said your horsepower goals are, that really is the cheapest and easiest way. Buy a complete 4.2 split port motor, dont even remove the lower intake manifold, it will bolt right in place and you will need to extend some wires and hoses and get a tune, and you are done. No cutting or tig welding, no porting, no custom parts, no adapting different plenums or throttle bodies, just bolt it in and go.
From my research, you would need a cowl hood (or cut-out) at the very least with the 4.2 upper. But I agree with what you're saying. Maybe OP just wants to be different and use his fab skills.
 

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I had an lower intake with the IMRCs already deleted but that went to the scrap pile already b/c noone expressed an interest here. Oh well. The RPM switch is really quite simple to implement if you want to keep the IMRCs.

I agree that if your stated goal is a 200HP V6, just buy a 4.2L engine as a long block.
It comes with all the bits you'll need.

Also, if hood clearance is a concern, just swap out the 4.2L upper intake with a mustang one. Problem solved.


-g
 

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Discussion Starter #20
Thinks for the input. I have been doing a lot of reading on this . I just may go split port and use a rpm switch. I was think that 3500 rpms may be the best setting for the switch.
 
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