Pics Inside the 2017 Red Manifold?
 

Anybody have one of 2017 intake manifolds off the car, or have the throttle body off, that could post pics? Would like to get an idea of the finish looks like on the inside, e.g. casting marks, rough or smooth finish.

Thanks!

Will

its rough really rough. i dont have a pic but ive been under the hood of mine before

Sounds like it would be a good candidate for the polish part of the old "port & polish" routine.


humfrz

I'm thinking an extrude hone might bring out a couple hp. It worked on the Honda B- engines. May be worth a shot...

I don't know how you would measure a couple of horsepower. Seems that these cars vary a couple of horsepower every dyno pull.

Welp, some folks go and put a "slicker" inlet tube on the car and thinks it makes a difference ........ so, a slicker intake manifold should add at least that much HP ...... but, since people cannot "see" it ....... it may not. Plus, it wouldn't have a "sticker", so, you may be right ....... ;)



humfrz

Is it as rough as a badger's arse? Port & polish with a blueprint..

I doubt there's anything to gain on inlet side unless you go fi.

Thanks, but I'm working on something a bit different.

Okay, so on a related technical topic, I could remove the throttle body and check for myself, but I don't know how delicate the new paper gasket is. It's a fairly young car (8000 miles). Would I be wise to have a spare handy or skip it and crack her open?

He wants to know how is the INSIDE of the manifold. You're probably talking about the OUTSIDE.

good catch

If you would change the word "anything" with "much" ....... I would agree with you ...... don't forget about the stickers ...... ;)


humfrz

:slap: ........ pay attention ........ :D


humfrz

I know there’s a few 2017s who went with a supercharger kit that replaced the red manifold. Maybe they can chime in. If not, when I put on my Edelbrock kit, I can snap some photos

http://imagizer.imageshack.us/v2/xq90/924/EiBIra.jpg
http://imagizer.imageshack.us/v2/xq90/923/kQGU8q.jpg

http://www.ft86club.com/forums/showp...85&postcount=1
Credit to @Trap63

And the other? Where bolt it on the block?
Edit: member found the pic.
I would like to try some porting/smoothing the inside

it's pretty easy actually...
 

You take several dyno pulls after and before and average the runs. Ideally you would want conditions to be as close to the same i.e. humidity, temperature, etc...
if the average is higher, it's probably netting gains.

Is it proof? no, but it is an indicator.

Jaden

My only regret is that I can only hit the Thanks button once! :happyanim:

Much appreciation.

It's not common practice to polish anymore is it? Port would mean removing the casting marks & in the old days "matching" the ports. but I thought a shiny finish was now considered bad.

Why would that be ....??

humfrz

At one point in time, it was believed that a rough finish on an wet type intake manifold would promote turbulence and keep fuel droplets suspended in the air stream as they traveled through the manifold. This is actually not entirely true, but it ends up being irrelevant for our cars anyway, since we don't have carburetors or throttle body injection. Rather we have a dry manifold, and no need to worry about keeping gas droplets floating through the runners.

So, the smoother the path for the air to follow, the better. Whether it is a substantial enough improvement to warrant several hundred dollars investment is yet to be seen.

Yea if it’s shinny guys will buy it! Or if it has a sexy girl and is shinny we buy 2!
:drool:

Honestly I thought with the tolerances now a days that one would not need to port and polish unless it was a rebuild or high end build. That was my understanding of why it was not done as often as it use to be. Plus we switched from leases to unleaded gas.

Ya lost me there, partner .....:iono:


humfrz

Pics Inside the 2017 Red Manifold?
 

In response to my own question, I bought a gasket (just in case, turned out I didn’t need it) and pulled the throttle off. Here is what I found:


The plenum behind the throttle body actually looks okay
https://i.imgur.com/Y10i34d.jpg


But then a peak down the runners reveals a rough ride. The surface is like a very rough sandpaper (no surprise there, sandcasting and all),
https://i.imgur.com/HMLQP13.jpg

Here’s a detail/close-up shot of a runner wall.
https://i.imgur.com/cNeB68u.jpg

It seems to my untrained eye that this manifold is a good candidate for a port/hone. Whether Extrude Hone is the way to go or not, I’m not sure. I haven’t seen any brush style hones that look flexible or long enough to deal with the length and curvature of these runners.

Either way, hope this information proves useful!


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Pics Inside the 2017 Red Manifold?
 

Ironically, your tongue-in-cheek answer turned out to be correct after all. :lol:


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My understanding is this.

A rough, sandblasted surface, leaves tiny little holes for air to reside. Air slides better on air than a shiny smooth surface.

I know it sounds crazy but on a large scale think of a truck bed. Tailgate down air is flowing over the cab and into the bed. The now horizontal tailgate is now NOT acting as a parachute. Efficient right? Actually no. The tailgate up traps a rolling air bubble in the bed. air coming over the cab simply bounces of this rolling air mass. Makes sense even it is seems less than logical -at first.


IIRC people would match the ports, get rid of casting marks and make the surface as straight and smooth as possible....then rough it up with a sandblaster.

I've also heard that. Polishing an intake doesn't improve flow and in theory could deteriorate it. Having a super smooth finish can increase air turbulence.

Look up "boundary layer effect." A perfectly smooth surface can still produce a significant amount.

I am not an expert on the subject, but a lot of people misunderstand what it means to texture a port. General rule of thumb I was always taught was "smooth to the eye, but not to the touch."

hmmmm........maybe you would like to do the math ........ I would, but it's time for my nap ........;)

https://en.wikipedia.org/wiki/Moody_chart


humfrz

Looks to me that the lower the roughness the lower is the friction factor. That makes me wonder if less friction = higher velocity?

I am having my 2017 intake manifold Extrude honed pretty soon! Will show results.

The fuel and air meet near intake ports so atomization shouldn't be an issue. I doubt there are any measurable gains to be had by reworking surface finish in manifold though. I'd like to be wrong on this one.

Maintaining that circulation of air in the truck bed requires energy. It's better to have solid bodywork for the air to flow over than for it to change directions and swirl around. Unless a turbulent boundary layer is needed for something very specific like aiding in fuel atomization, smoother is better.

I have just received my 2017 intake manifold extrude honed

Attachment 167965

Attachment 167966

Attachment 167967

Attachment 167968


The surface is much smoother. They mentioned that the intake manifold flows really good as it is. As good as Porsche 911 and some in terms of the CFM per runner.
Runner before after
1. 431 472
2. 433 474
3. 430 471
4. 427 468

Will post results

damn that looks awesome!

Can’t wait to see if this makes a difference!


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An average increase in CFM of 8.6%

Should be interesting to see how this works out. How much did the process cost?

Curious to see how this compares to the FBM intake manifold.

Yeah, I am excited. I am seeing the ceramic coat people this morning and see what they can do. It cost me about 600 aud.