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Engine Specific Info and Questions => IDI Engine => Topic started by: theman53 on November 22, 2008, 11:24:13 am

Title: Inside of the turbo intake log manifolds
Post by: theman53 on November 22, 2008, 11:24:13 am: *edit* What is involved in making a log manifold for your 1.6L TD?

Well I was thinking of making from scracth or hacking up mine and welding some onto it. What I really need to know is what do I have to know about the internal design. Is it restricted inside those things or like a dual plane some kind of thing. Or what I am hoping for is that it is just a gaint opening for all the air to dump into the engine. If anyone has a picture that would help greatly. I need to know what I am getting into before I make my mess :D
Title: Inside of the turbo intake log manifolds
Post by: SR Heer on November 22, 2008, 02:30:13 pm: OK - you win
For those of me who do not know what you are trying to accomplish,
Can you be more descriptive?

Thanks
Steve
Title: Inside of the turbo intake log manifolds
Post by: monomer on November 22, 2008, 06:07:45 pm: look at the passenger performance one.

It's a standard 1.6td intake manifold, chopped square right above all the ports. long sections of alumn is capped off with a notched-out pipe (of the IC plumbings dia.)

They call them a ram's Horn intake (or something like that)
Title: Inside of the turbo intake log manifolds
Post by: theman53 on November 22, 2008, 06:16:41 pm: Yeah I have looked there. I just didn't know if there was any kind of inside porting or if it was like a dual plane where the air came in went to the back and then turned before dumping into the intakes. If it isn't like that then I will probably have some fun and start welding.
Title: Inside of the turbo intake log manifolds
Post by: carrizog60 on November 23, 2008, 01:19:55 am: whats the big improvemet over the stock one?
and why the stock one is bad?
is it design?
if someone could explain that i would like to know...
for a start i think if you want to improve something you have to know how does it work first.
and i dont know :lol:
Title: Inside of the turbo intake log manifolds
Post by: dillenger1 on November 23, 2008, 06:07:20 am: flow restriction!the larger intake allows more air,therefore more air can get pushed in on each compression stroke.Ive heard gains of 10hp with only the mahifold.The stock intake ports are only around 1 1/2",opening that up well allow flow.
Title: Inside of the turbo intake log manifolds
Post by: dillenger1 on November 23, 2008, 08:14:00 am: I would think a driverside inlet would favor cylinders 3 and 4
Title: Inside of the turbo intake log manifolds
Post by: AudiVWguy on November 23, 2008, 08:17:09 am: What's the word on the Corrado G60 style manifold? Any down sides?
Title: Inside of the turbo intake log manifolds
Post by: dillenger1 on November 23, 2008, 02:25:28 pm: youll need to flip the exhaust manifold and clock the turbo or make a spacer.
Title: Inside of the turbo intake log manifolds
Post by: carrizog60 on November 23, 2008, 02:28:04 pm: Quote from: "dillenger1"
I would think a driverside inlet would favor cylinders 3 and 4

not a expert or closed to that but i also have this idea... :idea:
Title: Inside of the turbo intake log manifolds
Post by: zukgod1 on November 24, 2008, 08:08:15 am: Quote from: "carrizog60"
Quote from: "dillenger1"
I would think a driverside inlet would favor cylinders 3 and 4

not a expert or closed to that but i also have this idea... :idea:

I don't believe that would be the case in a turbo application. In NA mode ya I could see it as each cyl is sucking it's inlet charge but in a forced induction situation the turbo is charging the entire "log" at the same time. The air will be pushed into what ever cyl has a open intake valve.

With our OE intake manifolds there is no common area for the turbo to charge and 2/3 intakes are right below the intake horn so the get the benefit of direct forced induction while 1 and 4 get what's left over.