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

[david_white]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

Sounds like you are getting there, hopefully the skim and gasket will get the cr right and you'll be a big step further along.

[Roadsport]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

It's a good thing you can ditch the decompression plate. What kind of rods are you running?

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

std length s14 (144mm long as opposed to 149 that the pistons are intended for) steel ones from the land of down under, they recon they are good for 10K, they have been to 8K most laps, so with pistons 20% lighter should be ok for 9 TBH i dont really want to rev it that hard i cant afford to wear it out!

[Luke]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

Looking good Graham, how many hours would you have put into the work on the head?

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

theres a long days worth of grinding in the head, it was taking me about 3 hrs per cylinder although i did need to have a few breaks to let the compressors catch up or the die grinders thaw out, thats grinders plural, constant grinding after a while cause ice to form inside them so they stop working, plus they freeze your hands even wearing gloves

[Tristan]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

l, constant grinding after a while cause ice to form inside them so they stop working, plus they freeze your hands even wearing gloves

thats the only reason i got an electric diegrinder.

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

yeah i want one after using dave walkers one, the only downside of them is they are heavy!

[RWD fords rule]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

Graham, I have just purchased a really good, industial quality die electric grinder, and it is MILES easier and faster to use, much more torque than any air grinder even at low rpm and goes up to 20,000rpm, variable speed foot pedal, proper collets which crush at both ends instead of just one end in an air grinder, they accept 1/4", 6mm, 1/8", 3mm and a smaller size which is handy.

The hand piece is far lighter, about the same weight as a dremel and the head is a small diameter its about 20mm or so, you can get right down into an 8v port with the handpiece.

It uses a flexible drive shaft, I have tried to break the drive shaft digging out cast iron and alloy with carbide burr, it hardly even loads up the 190w motor!
Dremels are about 85w


Here is the motor:

http://www.axminster.co.uk/axminster-axminster-heavy-duty-flexible-drive-unit-prod20091/

And the hand piece, go for the standard size one

http://www.axminster.co.uk/axminster-axminster-heavy-duty-flexible-drive-unit-handpieces-with-collets-prod30234/

£107.85 for the lot including vat

The only negative point against it is that the flexible drive shaft could have been made little longer, but it is more than manageable, just mount the motor fairly close to you.
Lets just say I will never be using an air grinder again, they are sh1t compared to this.

I believe I could fully port 2 or maybe 3 heads with this grinder vs. porting one head with a good air grinder.

Its the nuts


Btw have a look here for a very good porting guide, this is where i found hte die grinder, this guy uses the same grinder day in day out for porting heads.

http://uk-mkivs.net/forums/p/362936/2467156.aspx

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

might have to forward the links on to a couple of peps that are wanting heads

[RWD fords rule]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

You'l make the money back in no time, with a good grinder like that you might even start a buisness selling full race heads?!?

Would be miles better than the average heads out there

[Tristan]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

Thats insanely cheap! Makes my Metabo http://www.powertooldirect.co.uk/met...e-p-76992.html look outrageously expensive! Just to clarify , you get the drive motor , the flexible shaft for, little over a hundred quid?

It's definitely powerful enough?

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

ok i dragged the £24 flow bench out again today, what i wanted to do was see what effect adding the inlet manifold to the head would have on flow, the answer being next to nothing infact adding the throttle bodies as well made more difference, i held the throttles wide open, but could close then a fair way before flow dropped more, i suspect it was actually the very long intake trumpets and joints between sections that was reducing flow, i did try without any trumpet and matters got a bit worse, but prob only because i didnt have anything on the t/b opening to smooth airflow, anyway im happy the modded oe inlet mounting thingys arnt hurting flow







next it was time to finish tickling the valve throats





this head has had the seats recut before i got it, so i just lapped the valves in, turns out though the exhaust seats were very wide and left a sharp corner, so i put a 60 degree cut on them to narrow them, the inlets got a very very light 60 degree cut just to " break " the seat edges and improve low lift flow, worth having as the port shape looses some very low lift flow






TBH the guides are a bit marginal wearwise, and i had to "select" the best valves but the budget really has been blown wide open, especially as i just ordered a couple of new tensioner blades having decided i didnt have any used ones good enough to go again,painfull two blades are £ 420 did i say something about building an s14 being cheaper

[M11rf]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

It's always the case that you go over budget, no matter what you are doing.

I find once the money is spent, it's forgotten about... until you next go to the bank

[RWD fords rule]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

Just to clarify , you get the drive motor , the flexible shaft for, little over a hundred quid?

It's definitely powerful enough?

You get the motor, the shaft also comes with the motor, and the hand piece is seperate, the lot of £108 inc vat, delivery was about 15 to £20 to southern Ireland, they also sell spare shafts, I got a spare one while i was at it.

I was also thinking 190W might not be enough for rough porting, I was well wrong! this thing is an animal, tbh I would not want to use it at full rpm if it had any more power, with a carbide burr in there it eats through cast iron, and porting alloy is even easier, not kidding you would rough out 2 or 3 heads with this vs using an air grinder to rough out 1 head, they are crap compared to this

[RWD fords rule]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

Good to see the old flowbench being used again, I have been flow testing some different intake systems on mine with pinto manifolds, the trumpet makes quite a big difference to flow and the width of the throttle shaft is very important, the thinner the better.

About getting max flow with the throttle slightly shut, some people say engines can make more power when set up to give less than full throttle, it seems having the throttle open just enough to not restrict airflow can give better port velocity in some cases.

That is how fly by wire works, the engine is only ever on full throttle high up in the revs, which gives much better low and mid range power due to better port/intake velocity.