WASSIS?

[V8 Vum]

Not knowing the LS7 beast as I did engines of the 70s ..(DON'T TITTER! I am learning FAST!)

... I would like conformation as to what these are and where they fit into the scheme of things:



And Finally, My Aircon Compressor needs an adaptor block to fit the Ultima hoses, so anyone able to tell me what to get and where?



Thanks Guys....Keith

[Boosted LS1]

First one is coolant/steam vent pipe which would usually go to a header tank. The red plastic cover's on the back of the MAP sensor so I assume your manifold has been reversed. I can't make out what the third item is.

[V8 Vum]

Yep, The steam thingy was the easy one!

I would love to know what the plastic capped (one cap in red, one bigger in black) tube ends are in the photo. On the LS7 install, these are at the top front of the engine (in front of the plenum chamber)above the water pump housing.

My guess is that one of them is some sort of Oil vapor vent? but then I am probably wrong!

cheers

keith

[V8 Vum]

Here is another picture at a different angle.....

[crafty]

the 3rd one vacuum for EVAP?

[UltimaCH]

Looks plugged to me. Are they (have they) been used? Diagnostic plug of some sort?

[V8 Vum]

Actually this is a brand new, never used, engine, and as you can see the smaller plastic port is covered by a red soft cap, and the bigger black rt ange one is covered by a rather perished black soft cap.

This engine came via Jeff direct from the GM factory.

Just thought I would ask you guys thinking it was a dimwit easy question, before hassling jeff for an answer.

Obviously this appears to be a bit of a mystery!

Maybe these are an inlets for the world's smallest procharger??? I WISH!

cheers

keith

Edited by V8 Vum on Tuesday 6th July 10:20

[Steve_D]

Are they vacuum sources for servo brakes and PCV?

Steve

Edited by Steve_D on Tuesday 6th July 11:01

[V8 Vum]

Actually this is a brand new, never used, engine, and as you can see the smaller plastic port is covered by a red soft cap, and the bigger black rt ange one is covered by a rather perished black soft cap.

This engine came via Jeff direct from the GM factory.

Just thought I would ask you guys thinking it was a dimwit easy question, before hassling jeff for an answer.

Obviously this appears to be a bit of a mystery!

Maybe these are an inlets for thw world's smallest procharger??? I WISH!

cheers

keith

[Mr.Snood]

I managed to lose these caps,
which is quite odd because the engine's sucking air at least through the black cap.
There's a loud whistle when the cap is removed.
I was told it's some sort of sensor/diagnostic plug, but no idea.

Edited by Mr.Snood on Tuesday 6th July 11:13

[V8 Vum]

Goodness, graceous me! Have I stumped everyone?

Can't believe it!



keith

[ezakimak]

Steve_D said:

Are they vacuum sources for servo brakes and PCV?

Steve

Edited by Steve_D on Tuesday 6th July 11:01

i think your right Steve, with the manifold on the correct way for a front engined set up that hose end with the black cover would be pointing directly at the vacume booster for the brakes. Where would the dry sump tank or rocker cover port normally sit in a LS7 vet ?

[Graham-P]

V8 Vum said:

Goodness, graceous me! Have I stumped everyone?

Can't believe it!



keith

No......having been through this I can tell you that on mine (LS3) the large pipe is for brake booster (keep plugged) the other smaller pipe I believe is for EVAP (keep plugged) I have also plugged the other EVAP pipe behind the throttle body....BUT as I said mine is an LS3 not a 7 so not sure if you have the same breathers as me.

Graham

[V8 Vum]

Graham-P said:

V8 Vum said:

Goodness, graceous me! Have I stumped everyone?

Can't believe it!



keith

No......having been through this I can tell you that on mine (LS3) the large pipe is for brake booster (keep plugged) the other smaller pipe I believe is for EVAP (keep plugged) I have also plugged the other EVAP pipe behind the throttle body....BUT as I said mine is an LS3 not a 7 so not sure if you have the same breathers as me.

Graham

Well done Graham - Thanks! - I knew you would win through!

SO, with this very useful info I have a cunning plan......

...I should be able to use the bigger of the two for a feed to my...Servo assist clutch, cos I am old and weak! Brilliant!

The smaller one then is a dopple-ganger of the evap trap thingy I broke off next to the throttle chamber, and then got a new one made out of ally! ..so I will keep this capped!

Ta for the revelations!

Ooooh! I love this forum!

Keith

[Spid]

Got my aircon fittings from Doc's Blocks

[V8 Vum]

Hi Adam,

I will see what variation I need - thanks!

Is yours the same as mine from the piccky?

cheers

keith

[Graham-P]

I have the same compressor as you Keith. How does your AC work, is it from the Ultima loom or from the engine/ECU loom?
Mine is from the Ultima loom but the compressor has an extra terminal, not sure how to wire it.
Any ideas??
Off to Le Mans on Thursday so be quick!!!!!!!!!!!

Graham

[V8 Vum]

Graham-P said:

I have the same compressor as you Keith. How does your AC work, is it from the Ultima loom or from the engine/ECU loom?
Mine is from the Ultima loom but the compressor has an extra terminal, not sure how to wire it.
Any ideas??
Off to Le Mans on Thursday so be quick!!!!!!!!!!!

Graham

Hi Graham,

OK, I had to do quite a lot of research and then some by comparing the occasional conflicting advice, and this is what I have ended up with - so I used the LS7 A/C 2 pin waterproof plug from the ECM loom (mine is the std GM one), then the a/c request wire coming from the ECM is patched into the Ultima loom to the switch. Then all the rest (fan and airdryer) are connected as normal via the Ultima loom.

Obviously I ma not in a position to test this yet, but all this sounds completely logical.

Hope that helps

Keith - and good luck and have fun!

[Graham-P]

Thanks Keith, seems my loom is different I have a motorsport loom, doesn't have A/C connector in the loom, not sure which terminal does what on the compressor, was hoping that it was a simple case of connecting the wire from the Ultima loom to one of the terminals and the other to earth...but I guess that would be too easy......
mmmmm

[Spid]

V8 Vum said:

Hi Adam,

I will see what variation I need - thanks!

Is yours the same as mine from the piccky?

cheers

keith

No not the same as mine, send them that pic with numbers from it and they will know what you need.
Shipping was expensive on my bits, so talk to them about that
Adam