My Custom Intake Manifold

Worstenemy453 · Mar 2, 2012

Yes, but the inserts would also need to be threaded for said plugs, AND have the relief cut for the o-ring. Otherwise it would just blow it out, and be a good leak point FWIW.

Pizza pig · Mar 2, 2012

Worstenemy453 said:
Yes, but the inserts would also need to be threaded for said plugs, AND have the relief cut for the o-ring. Otherwise it would just blow it out, and be a good leak point FWIW.

yes i mentioned they would need to be threaded... That they would need to be partially bored out for the o-ring to seal for sure. Thanks for mentioning it it slipped my mind LOL :rockon:

09stroker · Mar 2, 2012

Then weld an ORB bung, it's ready to go

redracer62 · Mar 2, 2012

im really wanting to do this, just want to see some more ideas on how to seal the top bolt holes.

DZL JIM · Mar 3, 2012

NPT will hold 3000 psi+, no need for o-ring fittings with 60 psi...

06f250powerstroke · Mar 3, 2012

Im not really worried about the top plugs sealing, but the ORB fitting would be a good idea, my main concern right now is getting the bottom bolts to seal up, I have a few different bolts im going to try out once i get it ported a bit better, I will bolt it up to my parts motor and see what needs to be adjusted, Im still trying to figure out a way to pressure test this thing

Extended Power · Mar 3, 2012

I am just posting these pictures to show the way the inside and top are done on Doug's Gogo stage 1 manifold for comparision. There is a lot of material removed from the inside for sure.
And you can see how there is an o-ring gasket on top to seal the lid down.

SEABEE08FX4 · Mar 3, 2012

Extended Power said:
I am just posting these pictures to show the way the inside and top are done on Doug's Gogo stage 1 manifold for comparision. There is a lot of material removed from the inside for sure.
And you can see how there is an o-ring gasket on top to seal the lid down.

Damn that's a clean motor, are those factory valve cover just polished ?

Dieselcraft · Mar 3, 2012

CLEAN
dougs intake is looking good

what are the true gains???
i want to hear THE GAINS

Mwilbur516 · Mar 3, 2012

I've heard 150*-200* drop in EGT's. I'm not sure of the HP gains, but I'm sure with the extra air they would have to be noticeable.

wetnsloppy4x · Mar 3, 2012

That's the thing. Nobody has ever posted back to back dyno results with Doug's intake. A few have said seat of the pant feels like 30ish horses. Personally, with the gain in airflow #s, I think that number is a little low even for a stockish motor.

Doug has taken the stock manifold about as far as it can go without doing quite a bit more rework than he already does. There are maybe a couple things that might make some marginal gains though. Radiusing the plenum to port transition inside the intake would be one. He leaves them pretty sharp. In fact, I had to run a sanding roll around on mine to get rid of the burrs/flashing left over from the CNC cutter around the ports. For the price paid, I was a little dissapointed about that. Not a real big deal though.

wetnsloppy4x · Mar 3, 2012

Extended Power, which type of loctite are you using on your intake bolts? Blue or red?

dstryr · Mar 3, 2012

wetnsloppy4x said:
Extended Power, which type of loctite are you using on your intake bolts? Blue or red?

Use blue...Red you will have to heat up to get out....

Powerstroked162 · Mar 3, 2012

wetnsloppy4x said:
That's the thing. Nobody has ever posted back to back dyno results with Doug's intake. A few have said seat of the pant feels like 30ish horses. Personally, with the gain in airflow #s, I think that number is a little low even for a stockish motor.

Doug has taken the stock manifold about as far as it can go without doing quite a bit more rework than he already does. There are maybe a couple things that might make some marginal gains though. Radiusing the plenum to port transition inside the intake would be one. He leaves them pretty sharp. In fact, I had to run a sanding roll around on mine to get rid of the burrs/flashing left over from the CNC cutter around the ports. For the price paid, I was a little dissapointed about that. Not a real big deal though.

Apex manifold is gonna address some of those issues

Extended Power · Mar 3, 2012

I have the red LocTite 272, the red 262, and the blue 243.
The 272 is the high strength, high temperature...the 262 is the permanent strength, and the 242 is medium strength and oil tolerant.
I usually use the 272 on the manifold bolts.

I added another tapped port to the top of the drivers side cap so I can tube the Diverter valve straight into it, and have no more hoses blowing off. (might be something else to add to your intake manifolds Steve.)

wetnsloppy4x · Mar 3, 2012

Powerstroked162 said:
Apex manifold is gonna address some of those issues

That's good to hear. It really doesn't look like it would have taken much more effort to program the CNC to cut those radiuses. I'm looking forward to seeing your finished product.

Ivan's looks to have a much smoother port edge than what mine came out of the box with. Mine was bad enough I was for sure going to be ingesting little bits of aluminum through all 16 ports.

Extended Power said:
I have the red LocTite 272, the red 262, and the blue 243.
The 272 is the high strength, high temperature...the 262 is the permanent strength, and the 242 is medium strength and oil tolerant.
I usually use the 272 on the manifold bolts.

That's comforting. It's been a well over a year since I've spoken with Doug. I was pretty sure he said use the red high strength but couldn't remember for sure. That's the stuff I used. Thanks!

Mwilbur516 · Mar 3, 2012

Powerstroked162 said:
Apex manifold is gonna address some of those issues

Can you shoot me some info and pics on this manifold. I'm in the market and have been looking at the GoGo unit. I don't think making my own manifold is something I want to try.

Extended Power · Mar 3, 2012

Mwilbur516 said:
Can you shoot me some info and pics on this manifold. I'm in the market and have been looking at the GoGo unit. I don't think making my own manifold is something I want to try.

Yip...there are some things better left to the people who have the proper connections...

Keanoknick · Mar 3, 2012

Mwilbur516 said:
Can you shoot me some info and pics on this manifold. I'm in the market and have been looking at the GoGo unit. I don't think making my own manifold is something I want to try.

x2, I'd like more info on this, price, when they'll be available, some pics, etc.. Thanks