M30B35 inlet tract size... can someone measure?

[gareth]

i've found an enclosed filter very similar to the following in a local store reduced to Ԛ£40...

http://cgi.ebay.co.uk/DIAVOLO-Real-Carb ... dZViewItem

it's got a 70mm inlet bore. i guess it is but can anyone confirm that this is significantly smaller than the inlet bore for a M30B35? it would allow me a nice enclosed cold air feed and filter in a nice compact unit but i suspect it's simply to small for the 3.5

am i right?

[Andy335Touring]

The M30 TB is 64-65mm bore, i don't know how big the AFM conections are as i don't have one any more

[gareth]

so, the bore on the rubber hoses is likely to be near 70mm ish?

this might be a goer then...

this is the one that i've found. seems very similar to the BMC jobbie but i'm still not 100% convinced it'll flow enough for a 3.5... http://www.ripspeed.com/catalogue/pdf/P ... ilters.pdf

[Andy335Touring]

You can't tell a lot from the link like how big the air filter is etc

[gareth]

i'm going to have a measure tomorrow!

[gareth]

right, the dimensions are as follows: (all measured with a tape masure in the shop so not overly accurate!)

inlet pipe OD = Ø76mm
inlet pipe ID = Ø70mm
body diameter = Ø135mm
body length = 205mm

it looks like the cone filter inside is about Ø40mm / Ø130mm x 170mm long.

i'm not convinced that it's big enough...

any opinions? cheap enough to be worth having a go?

[charlE30]

Just measured the inlet of the AFM with a digital vernier gauge and it's OD = 80mm, I would imagine that filter would be to small.
Hope this helps mate

[gareth]

so the AFM OD = tube id... there's only 4mm in it.

are all of the inlet hoses a similar size or does it get larger at the AFM to accomodate the rectangular inlet on the AFM withing a circle? (if you follow me?!)

[charlE30]

so the AFM OD = tube id... there's only 4mm in it.

are all of the inlet hoses a similar size or does it get larger at the AFM to accomodate the rectangular inlet on the AFM withing a circle? (if you follow me?!)

I'm still quite sleepy and a bit confused The inlet to the AFM is 80mm, surely you'd need a filter with an 80mm ID or it would restrict the airflow??



I don't have the hose or airbox to measure, sorry if this ain't helping

[gareth]

what i'm thinking is:

standard AFM inlet bore (say Ø77mm?) has an area of 4657mmԚ².

the throttle body has a bore of say 65mm which is an area of 3319mmԚ².

the fully open AFM flap (scaled off the screen with a pen and your vernier at approx 45x60mm) has an area of 2700mmԚ². a known restriction.

this filter i've found has a Ø70 bore which is an area of 3849mmԚ².

when put that was it doesn't seem so bad! i was kinda thinking the hoses may be say Ø70mm at the throttble body but Ø80mm at the AFM to accomodate the AFM flap within a circle.

i'm confusing myself now!

[charlE30]

what i'm thinking is:

standard AFM inlet bore (say Ø77mm?) has an area of 4657mmԚ².

the throttle body has a bore of say 65mm which is an area of 3319mmԚ².

the fully open AFM flap (scaled off the screen with a pen and your vernier at approx 45x60mm) has an area of 2700mmԚ². a known restriction.

this filter i've found has a Ø70 bore which is an area of 3849mmԚ².

when put that was it doesn't seem so bad! i was kinda thinking the hoses may be say Ø70mm at the throttble body but Ø80mm at the AFM to accomodate the AFM flap within a circle.

i'm confusing myself now!

I see what you're saying now, I take back what I said about the filter. I'd give it a go for Ԛ£40, have they got anymore or is it just the one?

[gareth]

i've bought one now! this one is Ԛ£40 as they've lost the aluminium cold air feed pipe from the box. however, i don't know if i'll need it and anyway, they have the pipes in also for about a fiver!

the fill kit should be in any branch of halfords for Ԛ£70.

i'll get some pics up when i get a chance...

real carbon fibre.............

[Andy335Touring]

Sounds good for 40 quid

[gareth]

piccies here: http://photobucket.com/albums/v382/gare ... onversion/

any opinions. the cone does still seem a bit small for a 3.5 but there's only one way to find out!

[Andy335Touring]

piccies here: http://photobucket.com/albums/v382/gare ... onversion/

any opinions. the cone does still seem a bit small for a 3.5 but there's only one way to find out!

Not sure about the air filter TBH, mine is about 150mm long and the same width wise at the thicker end.



What rad is that ? E34 auto ? I cant see the side lug things to mount the rad like mine ?

The core on mine is 575mm x 475mm x 35mm

[gareth]

it's a bit small innit....

that rad is from a E28 525i auto. got it cheap and thought it might be right... wrong!

got the right one now though, E28 M535i one for Ԛ£20! can't go wrong really! especially as it's in better nick!