Home made manifold.

[Dbeck002]

Ok I want the best flowing manifold for my combo.

Something along the lines of a holley systemax... But i dont have 600 bucks.

I was thinking of buying a single plane lower for a carbed engine and just forming my own sheetmetal upper.

The orientation of the throttle body will not change relative to its original position, i will take into account everything when making the swap.

I know that because there is no plenum the air will be moving faster and flow will be amazing which could hurt my low end.

So how about using a dual plane carb manifold or a small single plane and doing this? I have access to all the parts and welding is my fathers profession.

I want to make this happen. What are the suggestions?

 

[stang8urimport]

Just buy a Spyder intake............

 

[mrswivlepants]

Ok I want the best flowing manifold for my combo.

What's your combo? Sounds like more trouble than it's worth to me. If you're only working with a mildly modified combo, get a junkyard Explorer intake and port the **** out of the lower. The name TMoss is ringing in my head right now.

http://www.tmossporting.com/

 

[Michael Yount]

I looked at your site (nice job by the way) --- you've described the smog pump function incorrectly. The smog pump pumps FRESH air into the exhaust system to provide excess O2 so the cats can do their job. The EGR (Exhaust Gas Recirculation) is what allows some exhaust to be injected into the intake -- and there's no downside. It helps mileage and emissions, and doesn't function at w.o.t.

For your combo your ported EXPLORER intake looks like it's working just fine. I don't think it's holding you back. While you might pick up some power at peak with a spyder type set up, I think you'll lose a bit of low end with it. And the fabrication to set it up for efi is pretty involved -- not just welding but machining too. You've got pretty good numbers --- I think I'd leave it alone if it were mine.

 

[Dbeck002]

Thanks for the tips all. I think ill leave it be for now and just save up for the PRO-M and call it a day.



Oh and thanks for the clarification of the EGR, ill go fix that now

 

[emagdnim]

I looked at your site (nice job by the way) --- you've described the smog pump function incorrectly. The smog pump pumps FRESH air into the exhaust system to provide excess O2 so the cats can do their job. The EGR (Exhaust Gas Recirculation) is what allows some exhaust to be injected into the intake -- and there's no downside. It helps mileage and emissions, and doesn't function at w.o.t.

For your combo your ported EXPLORER intake looks like it's working just fine. I don't think it's holding you back. While you might pick up some power at peak with a spyder type set up, I think you'll lose a bit of low end with it. And the fabrication to set it up for efi is pretty involved -- not just welding but machining too. You've got pretty good numbers --- I think I'd leave it alone if it were mine.

I would say there is a downside to exhaust being injected into the intake because it makes the ports dirty and clogs things up if you dont rev your engine high often.

 

[Michael Yount]

It's not any worse than the deposits that build up on the back of the valves with gasoline constantly flowing over them --- but you can't very well do without the gasoline. Or the oily deposits that build up over the years/miles from pcv operation. In any event, those systems generally won't contribute to a problem in the intake until the engine is about ready for a rebuild anyway. But your point is well taken -- next time I'll re-phrase as "....there's little performance downside...."

With direct injection (injectors running at 3000+psig injecting directly into the chamber - on some Audi's now) we may get clean enough combustion that we can do away with most of the systems that cause the mess between throttle body and the back side of the intake valve.

 

[tmoss]

Do you want the intake that flows the most or the intake that makes the most average power?

I didn't see any pics of the lower runner where they meet the head flange for the intake you bought, but the work looks good from what I could see.