tooter 2.7 intake manifold spacer...

I've always wanted to use that graphic. I don't really mean shut up. I mean I'm looking forward to finding out more about availability. Great job and wonderful creative thinking.

My only concern with nylon would be lever force from the intake over time.

I'm not either. They're even on the same scale.

But yes. Horsepower = Torque * RPM / 5252 so at 5252 they cross.

HP = Tq * RPM / 5252
HP = Tq * 5252 / 5252
HP = Tq * 1
HP = Tq

One thing I find cool about our engines is the max rated HP is just barely below that.

 

Keep in mind the OP has a manual transmission. Your will be slightly less.

 

Thank you. I appreciate your advice and look forward to it as I'm going to be asking more from more people in the near future.

I am. Everything I want to do to my truck has how it will benefit it in mind.

I have a much longer response but just don't have time to type it at the moment. Tomorrow is Monday and Labor Day or not everyone expects their TPS reports.

 

Do you have more pictures of the other change you made?
And were there any others like this made?

 

The two porting changes were done to the left and right side of the manifold's single intake port. That photo could show only one side of the port without concealing the other side. The other side of the ported intake looks exactly the same.

As far as I know, all of the intake manifolds have exactly the same casting marks. I have two manifolds. One is on the truck all the time because it's my daily driver work truck, and the other manifold we used as a template to design the spacer so that it would seamlessly mate to the flange of the manifold.

 

Thanks for your kind words.
There's a thread in the "2nd gen Marketplace" where you can have your name added to the list of those who might be interested in buying a spacer. If you can make a short post there, I'll add your name.

 

I totally understand. At first I also was concerned about levering because it appears that the whole intake manifold is hanging from the flange where it connects to the head...

...but it actually isn't.



It's prevented from levering by the two lower bolt-on points of attachment to the engine block itself.

The solid block of nylon that the spacer will be machined from, is exactly the same material that the intake manifold is made of. And because of its thickness, it will be structurally stronger than the manifold itself. With the spacer installed, the two lower points of attachment will be two threaded rods with a 2 inch long tubing spacer slid over them for the nuts to tighten against.








This will hold the bottom snug and in the proper position so as not to put any stress on the top flange.

 

The conception of this project began on July the 11th.

On August the 11th, I installed the prototype on my truck.

And it looks like some should be available for sale around the end of this month.

This is a total elapsed time of about two and a half months from idea to finished product.

 

^^^^ With quantitative results to boot. Imagine that.

 

Definitely interested in this happening............

 

Yes, and driving around with it is even better than the dyno chart results. This project really turned out well.

 

If you'd like, there's a signup list in the 2nd gen Marketplace. It's not a commitment to buy, Just a list of interested parties so I can get an approximate idea of how many spacers I need to have made up.

 

Nicely Done,
ks

 

Thanks, Kilo.
When I first read about the 4.0 spacer, I thought WOW...
...what a truly creative concept that would help the engine by lowering the torque curve!

Then Torspd said:

...and I thought, well if they make one for the 2.7 then I obviously won't. So I waited... and nobody bothered to make one for the little economy engine. This was likely because they figured there was no market for it compared to the 4.0. And that's actually true because there are far more 4.0 Tacos than there are 2.7's....

...except I have a 2.7, and I wanted one too.

Then as I read how the whole painful 4.0 spacer process drug out for over a year like a never ending root canal from hell, and still only produced a product that was never going to be dyno tested...

...I gotta tell you that really pissed me off.

So I said to myself... "I can do better than that"
And did this just because I wanted a half inch intake manifold spacer for my own 2.7. And if it doesn't make a difference, well that's life. But then I got to thinking, hey my little 2.7 has an advantage over the big 4.0.

It's got no hood clearance issues!

So then I measured to see what's the biggest damned spacer that could be crammed in without causing a major catastrophe... and it was 2 inches. Wow... even if a half inch spacer could only make a little bit of difference, a 2 inch spacer will at least make 400% more of that little bit of difference...

...and that turned out to be enough to actually matter.

 

Are there any confirmed numbers on an mpg increase?

 

Torque peak lower = truck moving sooner with less gas pedal usage = more mpg......except for those thinking this means play race truck and ruining it for themselves.

 

The gas mileage increase is modest... just 1.6mpg.


533 miles @22.360 gallons with no spacer 23.8 mpg
519 miles @ 20.388 gallons with the spacer 25.4 mpg

At least I know it didn't hurt the gas mileage any.

 

Just an update. ..

The light is green.

The material has been ordered and paid for and production will begin soon. Saw a machined sample of the material and it looks exactly like matte black anodized aluminum!

 

I don't think a 6.7% increase in fuel economy is modest. If that holds up over time, I'd call that pretty meaningful.

I'd love to get another 6.7% out of my V6.

 

I think Tooter is rightly conservative on claiming significant mpg increase on the limited available data. Your mileage may vary. I respect that tooter acknowledges at best he can claim it doesn't reduce mpg.

IMO I have trouble seeing how a slight increase in torque between 1500-1700 rpm and a shift in torque around the 2800-3100 rpm range can translate into mpg gain for me. I keep it under 2000 rpm most of the time so I wouldn't see any benefit at part throttle from a full throttle gain of a 2-3 lb-ft of torque.

If you really want mpg increase you should stay out of the 2800-3100 range. That's 85 mph on my truck.