Td4 intake manifold path

guineafowl21 · Mar 9, 2015

Hi all,

I've done a search on this, but can't find the answer:

Why does the Td4 intake manifold split into two 4-port paths? Where does each go? Do I have a secret V8?

gstuart · Mar 9, 2015

guineafowl21 said:
Hi all,

I've done a search on this, but can't find the answer:

Why does the Td4 intake manifold split into two 4-port paths? Where does each go? Do I have a secret V8?

lol, no it's because its a dohc 16 valve engine

gstuart · Mar 9, 2015

does this help any better

each cyl has 4 x valves , 2 x inlet and 2 x exhaust so the inlet manifold has to reach either side of the cyl head

guineafowl21 · Mar 9, 2015

Ah, thanks. There must be a reason they didn't put both intake valves on one side and both exhaust valves on the other, then. I'll attribute that to the mysterious BMW fairies...by which I mean mythical woodland creatures, not... never mind.

disco_mikey · Mar 9, 2015

Nothing to do with the intake valves...

It was designed to run in a BMW car, with swirl flaps, to alter the intake lengths, for lower end torque, and high end power.

In the Freelander, the engineers wanted low end torque for off roading and towing, and so the system was not utilised.

disco_mikey · Mar 9, 2015

And there is not 1 exhaust valve and 1 inlet valve on each side of the head... They are both together

gstuart · Mar 9, 2015

disco_mikey said:
And there is not 1 exhaust valve and 1 inlet valve on each side of the head... They are both together

I thought that there was a pair of inlets and a pair of exhaust valves per cyl

my apologies with regards to the inlet manifold i stand corrected

guineafowl21 · Mar 9, 2015

Interesting... I just thought it was unusual as the other DOHC heads I've seen have a single runner per cylinder which then forks to the two intake valves within the head.

Now explain why the thermostat's positioned in such a way that whatever you do it's a damned nuisance of a job. I'm not bitter, by the way.

disco_mikey · Mar 9, 2015

Because the engine was designed to fit in a car. LR/BMW lifted the engine and dropped it straight into the FL...

Td4 intake manifold path

guineafowl21

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