A race bmw 316, m10, s14, m20, turbo, na, its been the lot!

[lee 1]

Re: a very powerfull and troublesome bmw 316

another interesting read Graham

Just one question how do you find the time for all these engine projects

[david_white]

Re: a very powerfull and troublesome bmw 316

Just one question how do you find the time for all these engine projects

The Guru can be in many places at once, such are his powers

[Graham]

Re: a very powerfull and troublesome bmw 316

Just one question how do you find the time for all these engine projects

im single and dont do much in the way of housework

as you can see from the state of the carpet under my spare crank which has now come back nice and straight with nice round journals

[Pushrod King]

Re: a very powerfull and troublesome bmw 316

im single and dont do much in the way of housework

as you can see from the state of the carpet under my spare crank which has now come back nice and straight with nice round journals

God Graham!! You'll have to clean the crank again now

[zip]

Re: a very powerfull and troublesome bmw 316

God Graham!! You'll have to clean the crank again now

[GT2200]

Re: a very powerfull and troublesome bmw 316

im single and dont do much in the way of housework

as you can see from the state of the carpet under my spare crank which has now come back nice and straight with nice round journals

Graham, I don't think i've ever seen so much spare carpet in your house......tell me the pool table....come parts store, come work bench hasn't gone?

[Graham]

Re: a very powerfull and troublesome bmw 316

right finally done a bit more, i realised my adaptor plate just wasnt tall enough to do the job, plus i had problems with some of the stud holes for mounting it to the head and t/bs were fighting for the same piece space, also realised the port angle and the slightly downdraft angle of the T/B's was going to leave a nasty kink in the manifold, so back to the drawing board, or more correctly engineering company to get a bigger (taller) piece of alloy and start again



to get over the problem of bolt holes for the head and T/Bs clashing the solution i came up with only drill the holes for the head studs half way through the plate and to mill a long slot in both the top and bottom of the plate ( after milling 3/4 inch off the height which took forever with a flycutter) i could then use very short studs in the head and bolt the plate on via nuts in the slot and have a totally clear top face to the plate onto which i could drill and tap holes for the T/B's





next came the issue of the t/b's port angle and the cylinder heads clashing unless i mounted the bodies up sidedown, which would be a pain with the throttle linkage then becoaming a major headache and the injectors pointing the wrong way, the answer to that was again a lot of milling with a fly cutter to reshape the plate to a wedge shape



it was tricky getting cutting out a notch in the plate the for water outlet and getting the bodies to line up with the head, in the end i had to resort to cutting a mounting lug down on the no1 body, so it now only bolts on on three rather than 4 corners, i think it will still seal ok, but even if it does have a slight air leak its only going to end up with a lumpy idle which in an 2500cc 4 pot engine engine with a 336 degree cam and a cr of well over 12.1 anf ultralight flywheel isnt likely to notice anyway its never going to idle smoothly

t/bs on the head on the bench, still to do is put the ports in the adaptor, but they will have to be done when i do the final porting to whichever head type i use.

incase you wondering theres about 6-8 hours work in that adaptor plate, but being able to reuse the bmw m3 T/bs and so not having to buy a new inlet manifold, t/bs or linkage etc etc has saved me getting on for £700









plate and bodies on yet another spare head on the short engine




note big header tank escort rad sitting in engine bay, i will have this recored with a much deeper core if i use that inplace ofmy old rad i wont need a seperate header tank and associated plumbing and will have more room for the dry sump tank

[Graham]

Re: a very powerfull and troublesome bmw 316

done a bit more today, reusing the s14 bmw t/bs might of saved me a load of cash, but gives me a problem, as far as i know there are no inlet trumpets that fit them, only the o.e airbox/plenum and a horribly expensive carbon fibre race air box,i needed another much much cheaper way.

rummaging around i found some 45weber trumpets and was pleasently suprised to find them a nice fit instide the bmw t/b's so i hatched a plan to cut some down and use them as a stub to attach some really long trumpets via some hose just like my old car



now i had another issue how the hell do i hold them in?
a bit more rummaging and i found the plenum i modified for forced induction, hacksawing the flange off it i had the means to retain the trumpets after a bit more machining





obviously hacksawing the flange off didnt leave a nice smooth finish, i knew i could fly cut it in the mill and then open the holes up to allow the flange to slide over the cut down trumpets and hold them firmly, but how the hell do i hold such an odd shaped thin piece of alloy without any clamps or bolts through its bolt holes getting in the way more pondering and i remebered something i was once shown at school aged 12, nail it to a lump of wood




one flange holding the cut down trumpets






one left over bmw 2002 trumpet attached,


heres the last place it was used

[angliaant]

Re: a very powerfull and troublesome bmw 316

nice work mate... very very clever... but why do they need to be sooooo long? is it to do with the amount of airflow?

[david_white]

Re: a very powerfull and troublesome bmw 316

Excellent progress Graham, most people wouldn't be so patient and therefore productive enough to come up with these solutions without the need to just spend ££££££££ on every part to get it to work

Looks like your poor old bonnet will be losing the scoop on one side where the turbo was and gaining a fecking great airfilter sticking out on the other Gonna look the nuts

Wouldn't you be better off with a slightly bigger rad, I have this one which is nice shiny new ally, has its own cap so no header and for you would be a very special price (£gratis).

Just has the outlets on the other sides from an escort, but sure you can work something out...

[Graham]

Re: a very powerfull and troublesome bmw 316

nice work mate... very very clever... but why do they need to be sooooo long? is it to do with the amount of airflow?

the length doesnt have anything to do with airflow,

its more to due with induction pulses differening cam profiles will prefer different induction lengths, and ram tuning, air like anything else has inertia once you have a long chunk of air moving it doesnt want to stop you can create a slight supercharging effect, so even when the pistons coming back up the bore and the inlet valve still open the air will still pile into the cylinder at high rpm.

my new engine is basically just a bigger capacity version of the one i used to use, we tried every intake trumpet length from none to the shortest i could get which was 15mm right up to 1 metre long the result was a on a 316 degree cam 17.5 inch trumpet gave best all round power curve, longer still gave lots more bottom end but the power dropped like a stone once it hit peak, shorter also gave less top end power rubbishing the whole long trumpets for bottom end short for top end thoery, infact this engine just doesnt like short intakes full stop.

interestingly when i later swapped the 316 degree cam for one with a mental 336 degree one as well as having to radically remap the engine i found it needed dshorter intakes with a trumpet a mere 15.5 inchs long,

the midrange grunt was something else, despite having ony 200bhp on tap out the corners i could out drag vastly more powerfull cars or fwd cars wit simlar power but 200kg less weight, at 5,000 rpm i had 30bhp more than a pinto with a similar power band and top end power

[Graham]

Re: a very powerfull and troublesome bmw 316

Just has the outlets on the other sides from an escort, but sure you can work something out...

hmm ta dave sounds like a plan

i could get a mate to cut off the inlet/outlet stubs and weld them on elsewhere, or perhaps better still turn the rad through 90 degrees, and just relocate the filler neck to the top of whats now an end cap but would become a proper header, got any diamentions for it

[david_white]

Re: a very powerfull and troublesome bmw 316

its 550 wide and about 500 high (normal way up) core width about 60mm, all only from memory though so will double check for you tomorrow

[angliaant]

Re: a very powerfull and troublesome bmw 316

ahh i seee... you learn something every day
thanks graham

p.s if you decide you dont want that rad

cheers

[Ken Welch]

Re: a very powerfull and troublesome bmw 316

Hi Graham

I have been reading about your engine building program, very interesting. Anyway our business is all about testing airflows, etc.
I have some old manometers that we dont use anymore and I am sure that they would be ideal for use with a flow bench (they look similar to the one that Swiftune uses). I assume that all you need and correct me if I am wrong, is a fan to produce suction and orifice with a known flow k factor and a manometer to measure the pressure drop across the orifice (air volume). If you are going to make your own flow bench you are welcome to one of our manometers.

Ken