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

[Pushrod King]

Re: A race bmw 316, 240bhp Atmo M10

urm wouldn't daves pinto put him into a higher class nick?

Don't think so,he'd stay in the same class that he's in with the Bm engine.

[exboyracer]

Re: A race bmw 316, 240bhp Atmo M10

SO, where did the crank break then Graham? Have you got a pic of the damage?

[mervhill]

Re: A race bmw 316, 240bhp Atmo M10

Don't think so,he'd stay in the same class that he's in with the Bm engine.

Non-standard though, wouldn't that'd move his class? Or surely people would run things like duratecs or XE's in their escorts etc.

[Pushrod King]

Re: A race bmw 316, 240bhp Atmo M10

Ok I'll Shut up!

[Graham]

Re: A race bmw 316, 240bhp Atmo M10

still havent really done anything due to ongoing back issues, but i did recently get a bit of use of dave walkers flow bench,
i took to of my experimentation heads with me, both i've had on my DIY bench, one was a small port 1.8 head, which has a raised port floor and i radically reworked, i had found flowed really well at higher lifts than my cam going and another more conventional 2.0 head, the flow V lift flowed the same pattern as my own testing.

the 1.8 head flowed just over 120cfm, altough dave though it would flow better if it had a proper valve seat as the head didnt have an inlet seat because the 2.0 valve is so much bigger than the 1.8 one, so due to be opened up so much the inlet valve seated directly on the alloy head,

the normal head ( which IIRC isnt as good as whats on my engien) didnt flow as well something like 110 cfm, but again dave thought he could see what held it back,

so i've had a couple of inserts fitted to the 1.8 and done a bit more porting to both, the plan being to put both back on the flowbench to see which design im best using next year

[Group4_Mark2]

Re: A race bmw 316, 240bhp Atmo M10

Do you think that your DIY bench is sufficient to develop a really good port or would you need to have the head eventually put on the pro bench to be sure that the work you have done is giving the expected results?

What sort of bench is Dave Walker using?

[Graham]

Re: A race bmw 316, 240bhp Atmo M10

dave uses a superflow bench cant remember which model thou.

without doubt my diy bench is good enough to develop good port shapes, although my bench didnt give me flow figs, differences in flow between the heads at different valve lifts stacked up, so the results i got gave a pretty good picture of what was going on, in fact using it i found a flow gain from removing material from where you wouldnt expect to, which was subsequently comfirmed by a top tuner of these engines who has also developed heads on a flow bench, it just appears i might have missed a trick on the short side, but to be honest when i was last experimenting with porting i got to the point where i was running out of time and stopped looking for gains safe in the knowledge i had already produced a better port than i used to use on an engine which gave just over 100bhp per litre

where i think the diy bench struggles is to record accurately very minor changes at high lifts, an example being i found no flow difference whether i built a plastoscene ring around the port but dave swears if makes a real difference on his

[caprimentle]

Re: A race bmw 316, 240bhp Atmo M10

well i have spent the last week or so of my evenings reading the whole thread, and i must say i'm very impressed to see it from start to end in a week or so was brilliant, extremly interesting to read and almost sadend by the fact i've reached the end, briiliantly though you've kept me on edge as i'm now extremly looking forward to seeing how this new 2.6 engine will turn out , one truely fantasic read, you should feel very proud of what you have succeded in the past few years, good luck and never loose faith

[Graham]

Re: A race bmw 316, 240bhp Atmo M10

very kind of you to say so,

im not sure the 2.6 will be dramatically better than the 2.5, i lack top end bhp and making the engine even bigger through a crappy old 8v head will probably reduce its ability to rev and may actually harm top end power,

my car also weighs too much, on the straights i can just about live with the lighter fwd hatches if they are 8v, the 16v ones eat me alive, what im going to have to do work on my strong point, my car is very grunty out the corners, the grunts enough i can keep the 16v cars behind me and even pull away, until we get to a longish straight when they are wound up to 9,000rpm that is, so if i can make it even more grunty i will pull out a bigger gap and hopefully keep them behind me, need to shed more weight too, but for the moment i need to sort the engine and a better lsd, might also try a slightly lower final drive if i can find one, weight saving will have to wait for the new shell to be ready which probably wont debut until 2012 now.

[caprimentle]

Re: A race bmw 316, 240bhp Atmo M10

well by the sounds of it, it makes even more sense to go to a 2.6, it will give you more torque and if it lowers the top end power to a lower rpm your'll in theory be higher up in the power band aswell, on a race were every little counts like 2 degrees to much camber, or a click or 2 on the shocks or even thinner paint to save weight, it seems like if its possible to get the extra 100cc and your aloud to, then i would do it, i wouldn't worry about the lower top end power, aslong as its just lower down the revs and not less in power because you could always change the gearing at a later date to suit,

just my 2 cents, it could all be bollocks

[Graham]

Re: A race bmw 316, 240bhp Atmo M10

ok my backs finally ok enough for me to do a bit of work in the garage as long as i dont spend too long out there, wanting to make the job of getting the engine out easier i took the head off first,
as you can see an the exhaust valves (and most of the inlets for that matter) touched the pistons



hardly supring when you see the nose of the crank!

[caprimentle]

Re: A race bmw 316, 240bhp Atmo M10

feck me, never seen that before.

[Group4_Mark2]

Re: A race bmw 316, 240bhp Atmo M10

From the rings on the metal it looks like it started in the big end journal, probably where there was some flaw in the metal or some other weakness and worked its way out towards the place where it finally broke off. It does not look like there was much holding it in the end.

[Graham]

Re: A race bmw 316, 240bhp Atmo M10

From the rings on the metal it looks like it started in the big end journal, probably where there was some flaw in the metal or some other weakness and worked its way out towards the place where it finally broke off. It does not look like there was much holding it in the end.

i'd agree , in fact there was nothing holding it other than no1 main



luckily the rods and pistons survived un damaged, the reason for drop in oil pressures obvious, clearly it shows how effecicent the pace drysump pump is because despite a severely knackered no 1 main and the oil way in the crank obviouslty being open i only lost 20psi oil pressure.

i'd say the crank broke simply through fatigue, after all it is only cast and has spent its entire life being revved to hell and back, the plus point is that clearly the dry sump has much improved lubrication, usually after all the use this engines had the bearings would be knackered but even no1 bigend which was obviously completely staved oil of when the crank broke was still in good shape and the rest of the bearing still perfect

[Tristan]

Re: A race bmw 316, 240bhp Atmo M10

come to any decisions yet regarding the rebuild?