G

guineafowl21

Well-Known Member

• Mar 9, 2015

• #1

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

D3 Grandad

Full Member

• Mar 9, 2015

• #2

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?

Click to expand...

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

 

Attachments

• 
  image.jpg

  63.2 KB · Views: 247

gstuart

D3 Grandad

Full Member

• Mar 9, 2015

• #3

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

 

Attachments

• 
  image.jpg

  19.6 KB · Views: 210

G

guineafowl21

Well-Known Member

• Mar 9, 2015

• #4

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.

 

D

disco_mikey

Active Member

• Mar 9, 2015

• #5

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.

 

D

disco_mikey

Active Member

• Mar 9, 2015

• #6

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

 

gstuart

D3 Grandad

Full Member

• Mar 9, 2015

• #7

disco_mikey said:

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

Click to expand...

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

 

G

guineafowl21

Well-Known Member

• Mar 9, 2015

• #8

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.

 

D

disco_mikey

Active Member

• Mar 9, 2015

• #9

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