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

[Graham]

Re: A race bmw 316, 240bhp Atmo M10

well its going to get a stroker crank, not sure yet whether to go for 91 or 91.6mm, need to get the block honed to see if it will go again, if it wont i will need a new block and will go with 91.6 stroke, if the current block will go again i might sick with a 91mm stroke due to block height issues i.e the current one has had quite a few skims in its life.

also plannned is to borrow use of dave walkers flowbench some more to see which head casting to go with

[Group4_Mark2]

Re: A race bmw 316, 240bhp Atmo M10

Graham,

When you use the flow bench do you just measure the flow or does Dave Walker have some tools to examine the port to see where they should be modified? My flow bench is getting closer to completion so I have started looking at some tools to help me get the most out of it. I recently came across "flow balls" (Dont you love the americans and the names they come up with) They are supposed to be used to determine the high flow areas and the dead areas in the port



There is a nice little write up here on the use of them.

http://www.tractorsport.com/cgi-bin/forum/cgi-bin/ikonboard.cgi?;act=ST;f=5;t=43;st=10

To quote from the forum

they are handy for locating the dead areas and any directional changes but i use them more for identifying the heavy flow regions and where to grind ,in conjunction with velocity probing. I look for two things: the areas that suffer the "heaviest losses in flow" when blocked with the "smallest" flow-balls & the areas that suffer "very little flow loss" when blocked by the "biggest" flow-ball. Then i take velocity probe readings of the same areas to "back-up" these findings,

Do you think that they would be any use?

Regards
Tom

[Graham]

Re: A race bmw 316, 240bhp Atmo M10

never seen those before, dave has ( i also made one) velocity probes, basically a manometer attached to a long thing tube so you can tell the air speed in various parts of the port which gives you a good clue whats going on, also plastoscene is a great tool, if you build up the port slightly somewhere and flow drops the chances are removing a bit of material will give a flow gain

[Group4_Mark2]

Re: A race bmw 316, 240bhp Atmo M10

Do you have any photo of the velocity tube you made.

I suppose the plastiscine is the same as the balls. The only advantage is it is easy to move the balls around the port and quickly see what is happening. Is there any risk of the plastiscine getting sucked into the bench?

[Graham]

Re: A race bmw 316, 240bhp Atmo M10

Do you have any photo of the velocity tube you made.

not to hand but literally all you need is an 18 inch tall manometer make from clear screen washer tube, and a piece of brake pipe in one end to poke up the port, your soon see where the air speed and therefore flow is fastest

[stephen bahr]

Re: A race bmw 316, 240bhp Atmo M10

using paint skills inherited from father... it looks something like this...

[Group4_Mark2]

Re: A race bmw 316, 240bhp Atmo M10

I have to say that you definitely have a gift for art

However I get the idea. It should not be too difficult to make and would easily tell where the air was flowing fastest in the port. One question, is the end of the pipe in the port plugged with small holes in the side or just an open pipe?


Tom

[stephen bahr]

Re: A race bmw 316, 240bhp Atmo M10

from memory it was just a piece of open pipe, and i can't think why i didn't do well at art in school...

[Graham]

Re: A race bmw 316, 240bhp Atmo M10

One question, is the end of the pipe in the port plugged with small holes in the side or just an open pipe?

its just an open end, i used a piece of brake pipe

[Graham]

Re: A race bmw 316, 240bhp Atmo M10

using paint skills inherited from father... it looks something like this...

the only thing really wrong with that picture son is its showing a pressure in the port not a vacuum

[Graham]

Re: A race bmw 316, 240bhp Atmo M10

dave white popped over today, well if you can call spending hours sitting in traffic jams popping over!

he set to on the new sheel for my race car, basically it was a whole car, which had just had the seats and few bits of interior trim unbolted 6 hours later ( allowing for lunch and a few other things)
the car looked like this










its now a totally bare shell devoid of any thing bolted to it



great stuff, even better is the shell is actually really really good, just one rust hole in the scuttle which is easily repaired, the rear arches are shot but will need cutting off and inlarging anyway, its got a few scabby bits but its good enough i can safely make the alterations i want to the shell install the rollcage and get it dipped and e coated all in one go

E30's can rot in some strange places and often do it under almost perfect looking underseal, but im very confident this shell doesnt have such issues, its just going to be a long long task removing 1000's of studs welded to the body which retain everything from carpet to sound deadening and the hoards of redundant bracketry throughout the shell before it can go to be dipped not to mention i need to save some more money to do so as well as sorting the engine!

[Group4_Mark2]

Re: A race bmw 316, 240bhp Atmo M10

Nice looking shell you have there Graham... Should be an excellent base for the new race car... I was thinking what you said previously about it having the aerodynamics of a brick or some such description. Is there much you can do within the rules to improve this such as zacspeed style front bumper, rear diffusers or slat panneling under the car to improve airflow or would all of these be illegal?



Tom

[Graham]

Re: A race bmw 316, 240bhp Atmo M10

i can do more or less what i like with the front bumper as long as i dont extend it forward of the origonal buy more than 15cm, the other stuff you mention is illegal

[david_white]

Re: A race bmw 316, 240bhp Atmo M10

Got to say the pics don't do the car justice, this really is a lovely shell. In fact with a bit of t-cut it would look perfect as it is but it does need the sound deadening and underseal removing so a good dip in the acid should sort it right out once the cage etc and lightening is done.

Was suprised we managed to take a complete car (minus seats and doors) down to a shell with nothing at all on it in a few hours, especially as we spent at least an hour trying to work out what this shell would have cost in this condition had it been an escort

[Tristan]

Re: A race bmw 316, 240bhp Atmo M10

especially as we spent at least an hour trying to work out what this shell would have cost in this condition had it been an escort

probably 10 times as much as the E30 shell! mad , isn't it?