Baaa Ba...Trumpety things.

[Byff]

Just had my 4.5 for two days and found my first niggle.

The purple trumpet thingys are a little too short to stay seated on the airbox thingy. They keep parting company despite replacing the clips with jubilee clips.

Any of you had this problem?

[MonkeyJunky]

Its most likely to be the airbox connections that are too short. Most garages / People over tighten them and the airbox male portion of the joint cracks off (ouch). You should have a good inch or so protruding from the box. If not they will need building up with a spot of fibreglass.

[noodles 4.2]

Hmm,

Could someone explain this thread a little further - I got a bit lost at 'thingy'.

Does my 4.2 have purple trumpets?

Tony

[gazzab]

4.2s dont have the same purple things.

[dannylt]

Can you show us a picture of them? I'd be amazed if the connectors had broken off. How are you positioning the jubilees? Using jubilee is definitely the way forward from the factory supplied circlips for ease of removal! Here are mine, half stripped

[jonny tvr]

Yours look clean!

My purple things have gone black/brown in places!!

[whatever]

jonny tvr said: Yours look clean!

My purple things have gone black/brown in places!!

That can happen -- it does get a bit hot in there. A few hundred quid seems to make them go all nice and clean and purple, though. I've no idea why...

[dannylt]

Brown is ok, and a few sprouting wires too, but when they start getting holes you should probably start replacing them.

Mine was all replaced at 14k with the red rose mods, along with a bunch of other stuff

[smifffy]

jonny tvr said: Yours look clean!

My purple things have gone black/brown in places!!

Time to see a doctor? You should leave Mungo's women alone too

[Byff]

Sorry for the delay in replying.

The male part of the airbox is still ok. I've managed to get the pipes to stay on now, but not without a lot of wrangling and puffing.

I'd still say either the airbox is too far away (is it adjustable?) or the pipes have shrunk.

[dannylt]

Hmmm. I think there may have been different versions of the trumpets - mine fit nicely on both ends. Which ones are a problem? If you take them all off (making sure you remember which ones goes where!) then put them back on from the central cylinders outwards. Just make sure you don't connect them up wrong - apparently this has caused the demise of quite a few engines!

danny

[ches]

How would connecting them up incorrectly cause the demise of the engine? It's simply a way to get air into the cylinders!!

[Byff]

I'll see if I can get a piccie of mine.

Just thinking if they are not of universal length, then they could have been put back in the wrong positions (not wrong holes, just wrong pipe in wrong area)

[Cerbnut]

Does anyone know why the 4.5 has these purple trumpety things as opposed to the 4.2 type ones?

Seems like the only difference is the r/h air intake supplies the l/h bank and vice versa on the 4.5, whereas in the 4.2 the r/h intake feeds the r/h bank??

[ro_butler]

Ask Joolz.

I may be wrong but he suggested the way forward was a 4.5 engine with 4.2 inlets?

Or something.

[dannylt]

Simply a way of getting air into the cylinders!? Why do you think manufacturers bother with tuned length inlets, manifolds and trumpets? The length will significantly affect flow at different rpm's. I guess you think an exhaust is equally unimportant?

Apparently some have been connected up wrongly and caused various resonances squashing the tubes flat which after a lot of high speed running have blown up angines.

The 4.5 has longer inlets to increase top end power allegedly. The whole 4.2 on 4.5 inlets thing is mostly speculation - I only know of one factory special that had this, and it was alleged that it sacrificed top end power for mid range.

danny

[ches]

Clean air at ambient temp delivered to crude fibreglass air boxes ducted through similar length convergent rubber pipes to seperate throttle bodies; Not exactly rocket science. Anyway you'd have to be Stevie Wonder to connect them up incorrectly.

>> Edited by ches on Wednesday 23 October 13:09

[whatever]

ches said: ...Anyway you'd have to be Stevie Wonder to connect them up incorrectly.

I've seen it done...

[jeremyc]

whatever said:

ches said: ...Anyway you'd have to be Stevie Wonder to connect them up incorrectly.

I've seen it done...

Stevie Wonder servicing a Cerbera.

I'd have paid to see that!

[ches]

A bit over your head that one then Jeremy