Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [intake-manifold]

38 questions
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Yamaha R1 intake tract configuration

Interesting Configuration The Yamaha R1 has a very strange intake design. Notice the intake horns in the image below. They sit above the throttle bodies and are not attached directly to them leaving an air gap between the throttle bodies and these…
DucatiKiller
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How does intake manifold runner length effect the power curve of a car?

Recently I learned that a number of things such as the cam profile, compression ratio and the intake manifold runner length and volume can all effect the power curve of the engine. Here is an example of one. What exactly is the intake manifold…
Max Goodridge
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How do variable-length intake manifolds work?

I have heard many vehicle manufacturers have been using this to improve power and torque figures. They do this by altering the length of the manifold, I am hoping for better diagrammatic explanation.
Shobin P
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Consequences of a Dirty Intake Manifold

This is similar to, but not the same as my question Effects of Dirty Piston Heads and Intake Valves. Basically, I often see people talking about taking the intake manifolds off older cars to clean them, or to seafoam them, separate from just trying…
Robert S. Barnes
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Best way to remove broken bolt from intake manifold (broke nearly flush)?

While trying to remove the intake manifold from an old Ford 302 one of the bolt snapped off. As you can see below it is just about flush with the manifold (just below. What's the best way to get this out? Do I have any choice but to drill it?
AnthonyM
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What are some Seafoam Alternatives

I read this procedure for using Sea Foam ( also listed on their website ) to clean the intake manifold, injectors and crankcase. I think this would be useful for my vehicle, however Sea Foam isn't available where I live. There are some Liqui Moly…
Robert S. Barnes
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Torn metal found beneath oil filler cap, need help identifying part and severity

I was replacing the oil today when I noticed torn metal inside the engine -- never a good sign. This is a 2005 Pontiac Vibe 1ZZ-FE, on which there is a lot of documentation but none proved useful to an amateur such as myself. Here are the…
Joe
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Same engine but different intake manifold design: which one should I use?

The engine I'm rebuilding (Skoda Estelle '72, RWD, rear mounted engine) is the same from previous models, with slight different changes. One of the things they modified was the intake manifold which, as I'm guessing, correspond to a different…
Aram Alvarez
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I have a Vauxhall zafira diesel 1.7 what happens if the EGR valve and inlet manifold get blocked with carbon

What happens if the EGR valve and the inlet manifold get completely blocked
Steven White
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Manifold vacuum vs performance

I've been reading around looking for data on how to interpret manifold vacuum. Why? Well, my original thought was that 0.0hg meant that there was no restriction in the intake system and would mean you're getting the most potential. I soon found that…
DustinDavis
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How to fix an injector leaking into the manifold?

I suspect I have an EFI common rail injector that fails to hold pressure and slowly leaks petrol into the manifold when the engine is shut down (and possibly while running). I am interested in why this happens and whether it is fixable. Do…
I have no idea what I'm doing
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What is an intake heat control valve for?

I'm working on a motor that uses a vacuum and electrical harness from a 1986 Mercury Cougar 3.8L with EEC-IV. I have an unused vacuum line from a solenoid and I'm not sure where it goes. It's labeled as "Intake heat control valve (31)". In the…
Kevin Evans
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Effects of intake valves leaking

I just measured cylinder leakdown rates on my 2007 Tacoma V6. 5 out of the 6 cylinders had retention rates of 75-85% (leaking 15-25%) but my cylinder 4 (left engine bank in the middle) was leaking about 75%, retaining only 25%. The easiest of the…
amphibient
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VIP future champion gas moped (carb)

I have a moped talking, and on the carburetor there are usually two hoses, right? Because currently mine only has one coming from the carburetor, and the line is going to the gas tank. However, I do see on the bottom of the carburetor that there's…
Jordan
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Burning smell when getting out of the car

I sense a burning smell when getting out of the car (Nissan Maxima 02 V6). I am pretty sure it is an oil leak from somewhere based on the odor, but not sure where else to look for. The smell was pretty heavy about a month ago and I noticed that the…
Viriato
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