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Plastic intake for Slant
https://slantsix.org/forum/viewtopic.php?t=55640		 Page 1 of 1
Author:  Hanibel [ Thu Jun 19, 2014 1:39 pm ]
Post subject:  Plastic intake for Slant
I have been playing around with 3D design software and saw an article on high heat plastic intakes.

I know there are a few people who are making their own intakes for turbo/supercharger/FI etc. out of steel, but dont know if anyone has looked into the high heat plastic yet

I was thinking that my first attempt would just be to recreate the stock 2 barrel. I have an extra that I can use to get the measurments

I also found a company that will do injection molded design in as low as runs of 10 (no pricing)
Author:  Reed [ Thu Jun 19, 2014 1:42 pm ]
Post subject: 
At this late date I think that any aftermarket slant manifold should include provisions for injectors in the manifolds. Further, the mounting pad for the carb should really be dsigned for use of a throttle body. I would prefer to see an intake with injector bungs and a throttle body mounting pad designed to fit a cheap and readily available throtle body such as the Ford Mustang 5.0 TB. It would also be nice if the manifold had provisions for EGR.

If someone could come up with a FI slant intake and fuel rail package I think it would sell. Those are the two hardest parts to fabricate for building an FI slant.

I keep hoping Doc will update his FI manifold modification article and write the fuel rail construction article he promised. :wink:
Author:  Joshie225 [ Thu Jun 19, 2014 2:35 pm ]
Post subject: 
Reed,

I don't think we can do EGR directly with a plastic intake.

I wouldn't bother making a plastic carburetor intake for street use. The heat transfer would be poor and make for awful fuel puddling.
Author:  Reed [ Thu Jun 19, 2014 2:55 pm ]
Post subject: 
D'OH! :oops: I suppose it is true that EGR won't work with a plastic intake. Now I need to see how Ford worked the EGR on my 99 Town Car since it has a plastic intake.
Author:  oldskoolracer [ Thu Jun 19, 2014 2:59 pm ]
Post subject: 
Most newer cars that run an EGR and plastic intake use an EGR pipe to bring the exhaust into the intake and dont usually mount it directly to the intake...

Why would you really want an EGR though? I get it in a stock application, but when your to the point of one off intakes and fuel injection doesnt it seem kind of taking a step backwards? Even my 89 VW doesnt run an EGR system and its a factory 10:1 compression engine...
Author:  Reed [ Thu Jun 19, 2014 3:14 pm ]
Post subject: 
Nope. EGR is actually an important component in later more advanced fuel injection applications. It is accounted for in both the timing map and in the fuel mixture calculations. I plan on building a MAF based MPFI system for the slant six out of the Ford MAF MPFI system used on late 80s and early 90s Mustang 5.0s. I want to keep the EGR system due to (a) reuced emissions and (b) the ability to run slightly more aggressive timing if the EGR is in place.
Author:  Greg Ondayko [ Thu Jun 19, 2014 3:27 pm ]
Post subject: 
Quote:
D'OH! :oops: I suppose it is true that EGR won't work with a plastic intake. Now I need to see how Ford worked the EGR on my 99 Town Car since it has a plastic intake.
they work with plastic intakes. my wife's 2011 escape with a 3.0 v6 has a plastic intake and an egr.


Greg
Author:  GTS225 [ Thu Jun 19, 2014 3:51 pm ]
Post subject: 
Well, so far as I know, no one is making a three, one-barrel intakes. One like that, that would accept Holley 1904'S or 1920's would look sweet sticking out the side of my T-bucket.

Would reducing the runner internal dimensions keep the velocity up enough to negate the fuel puddling problem?

Roger
Author:  Hanibel [ Fri Jun 20, 2014 7:12 am ]
Post subject: 
Nice information.

I was going to use the stock 2 barrel as my first model because I have a broken one that I can cut up to get proper measurements in to the 3D software.
After that I will look at modifying it for other purposes. Fuel injection being tops on that list

As I was researching the plastic intakes more I am concerned about the proximity to the exhaust on our slants.
Most application I have seen have the intake and exhaust separated, not right next to each other.
And of course I will have to investigate the thermal expansion for these plastics before I get one made
Author:  Reed [ Fri Jun 20, 2014 7:16 am ]
Post subject: 
The runner can stay the same for a stock two barrel manifold and a FI manifold (with the exception of adding injector bungs). All the modification would be on the end of the manifold where the air enters (carb or throttle body).

Is someone was running fuel injection they likely would als be running headers or some other non-stock exhaust if only to eliminate excess heat in the intake.
Author:  oldskoolracer [ Fri Jun 20, 2014 12:15 pm ]
Post subject: 
Quote:
Nope. EGR is actually an important component in later more advanced fuel injection applications. It is accounted for in both the timing map and in the fuel mixture calculations. I plan on building a MAF based MPFI system for the slant six out of the Ford MAF MPFI system used on late 80s and early 90s Mustang 5.0s. I want to keep the EGR system due to (a) reuced emissions and (b) the ability to run slightly more aggressive timing if the EGR is in place.
Yea, I get emissions, but a properly tuned FI engine can accomplish some crazy fuel and timing maps without a primitive device like an EGR... It does its job of reducing NOx by taking up valuable compression space in the cylinder... So basically its just a band-aid for emission purpose. You can get the same or more power from an engine without an EGR without needing excessive timing curves...

Im not trying to start anything... IM only asking/stating this stuff for the sake of conversation and personal information :D
Author:  Reed [ Fri Jun 20, 2014 12:19 pm ]
Post subject: 
Sure, and because I am keeping a mostly stock tune on the For MAF injection systems, I want to keep the EGR system since it is accounted for in the factory tune. Plus, for me, reducing emissions is more important than maximum power and even more important than optimal fuel economy.
Author:  oldskoolracer [ Fri Jun 20, 2014 3:35 pm ]
Post subject: 
Okay, I can understand that. I guess just being a young gun I didnt see the point of going as far as a custom intake and fuel injection to retain factory emission equipment.

Just me being me Id be going that far to squeeze as much performance and economy out of an engine. Plus the convenience of no carb or choke to deal with.

If the material used is the same as what is being used on the OEM applications I cant see the exhaust manifold doing much damage. You wouldnt need the heat riser if your doing multi-port style injection. You could also run some heat shield/insulation between the two manifolds if you needed to as well.
Author:  Greg Ondayko [ Sat Jun 21, 2014 5:24 am ]
Post subject: 
I also think that plastic intakes are mostly designed / for dry systems not wet systems.

Greg
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