E30 Alpina exhaust manifold heat shield

[reggid]

does anyone have any pics of the Alpina heat shield they fitted with the 6 branch manifold?

[pukar]

https://www.google.co.uk/search?biw=128 ... 1PvqBJf2_8

they just look like regular ones to me?

[reggid]

there is an extra piece that looks to clip onto the standard heat shield pg 10 but not sure if this is the only attachment method

http://www.thealpinaregister.com/downlo ... ts/e30.pdf

http://9tro.com/media/features/tuned-ca ... m-the-past

[pukar]

oh, right, not seen that before... is it genuine alpina?

[reggid]

yes, the pdf shows part number but wouldnt know where to get one. i was going to make something similar

[pukar]

email alpina with the part number and they'll tell you if it is nla

export@alpina.de

although showing off your alpina six branch is surely more aesthetically pleasing?

[reggid]

Puts a shitload of heat into the engine bay even with ceramic coating

[pukar]

but will the extra metal stop the amount of heat, i can't see how unless it shifts the heat outside of the engine bay? the heat shield are just to stop the HT leads getting too hot i thought...unless i'm wrong

those leads all over the heat shield in the pic you posted looks wrong as well... should they not be tidy in a rail? they would probably rest on the manifold if that extra metal was not in place.

might be worth asking alpina the question when you email them. it would certainly be interesting to know what it's real purpose was. could you post up if you find out?

[Brianmoooore]

but will the extra metal stop the amount of heat, i can't see how unless it shifts the heat outside of the engine bay?

Looks like it'll catch a fair bit of air flow from the radiator/fan, so it probably does remove a fair bit of exhaust heat out the bottom of the engine bay.
Agree about the ignition leads. Tied together like that, there'll be a fair bit of inductive coupling between them, increasing the rise time of the EHT, reducing its peak value, and raising the possibility of a couple of extra plugs firing as well as the one that should be.

[BenHar]

Agree about the ignition leads. Tied together like that, there'll be a fair bit of inductive coupling between them, increasing the rise time of the EHT, reducing its peak value, and raising the possibility of a couple of extra plugs firing as well as the one that should be.

Why is tying them together any different from having them in the standard ducting?

Thanks
Ben

[reggid]

its just a simple radiation heat shield, reflecting the heat downwards. nothing to do with air flow as such or ducting etc. The s50b32 in e36 M3 has one.

my windscreen reservoir water gets hot enough to pressurize from the water heating and a slight leak out the lid. i added a stick on reflective alumized sheet which helped but best to tackle the source as best as possible as everything else in the vicinity is being heated to. dont even ask about the clutch reservoir....

[Kedge]

I've considered ceramic coating for my BTB manifold due to the heat it gives off, have you found it to be a waste of money?

[reggid]

ceramic coating works but its not a miracle cure

[Simon13]

And what problems are you suffering from heat then?

these sheilds came about so i'm told because in hot weather and heavy traffic the MD of BMW GB suffered some melted HT leads in his C2 2.7 back in the day. He wasn't amused and big cheeses get results so this is what they came up with

the E34 bi turbos have something very similar but the heat off two turbos is a fair bit greater!!

[reggid]

i am also trying to reduce inlet air temps on hot days and reducing under bonnet temps as much as possible and reflecting the heat down as oppose to letting it make its way over to the inlet side is one of many things i am doing.

[Simon13]

Are you running a standard air box?

[DanThe]

Cutting the rear 3/4 off the bonnet is a popular mod nowadays

[reggid]

Are you running a standard air box?

custom airbox with ITB, needs to be sealed off from the engine bay properly currently sucking through a cone....

IAT were 70C today with A/C running car stationary but it was 46C outside in the shade. coolant temp was between 86-90C