Graham's bmw 2002 race car.

[Graham]

Re: Grahams new old race car, bmw 2002 reborn

Graham,

, just build a car to get on track and then develop over time. Most important aspect is to get out on the black stuff again.

that would be my advise to someone else, but i wont be happy if i cant lap brands in the mid 55's, because thats what the old car would do on secondhand slicks, so i have to aim to better that if not win.

realistically it wont be on track anytime soon, i just dont have the money, its all tied up in the business and im not going to get in debt just to go racing. Been there done that, in the long term doing that really hurts!

[Graham]

Re: Grahams new old race car, bmw 2002 reborn



this might not look much but its major progress, the cars now out of its corner and mobile, well on a trolley, which means i can actually work on it again

[mario r h santos]

Re: Grahams new old race car, bmw 2002 reborn



Looking forward to see this car on track Graham!

Cheers,

Mário Santos.

[Graham]

Re: Grahams new old race car, bmw 2002 reborn

now the car lives at work not home i cant just pop down the end of the garden for a few hours here and there, so will have to make an effort to find a bit of time to work on it at the end of each day before i go home, it will mean not working so late on customers cars, but its something i have to do if i am to ever get it done before im 50, and at teh moment thats my goal, be racing again before the big Five O, which gives me, 2 years 19 days!

hers a few pics to kick the thread back into life


rear beam ready for stripping down, its now in bits


look at that wheel spacer someone fitted, its an inch thick and weighs a ton, but even with that 7 inch wheels are lost under the rear arches


adjustable camber brackets i made and fitted some 15 years ago


alloy panels in boot floor, they wil have to go to comply with race regs, left one is where the spare wheel well was cut out, i have to put steel back in there, right side is where the fuel tank was, removing the std tank leaves a big hole in the floor, in theory that one cold stay as its not a modification to the floor, but rather than risk a fight i will put a steel panel in there, theres very little structure to the very rear of these cars anyway so prob not a bad idea


teh diff, sadly although its an lsd somewhere over the years my motorsport diff has been replaced with a road going e21 lsd, which wont cut it on a powerfull engine and slicks, i know i tried all those years ago


alloy panels gone from boot floor, and my first proper look at the rear end underside


bit of work needed here


and here


and here, but overall for such an old car it could be a lot worse.


finally a bit of the repair work i did last year, no plates over anything, i cut anything grotty out, just a couple of little bits still to do to finish off, now i can get to the car and welding doesnt cost me anything that should soon get done

[Roadsport]

Re: Grahams new old race car, bmw 2002 reborn

Welding is nice that way.

[Stu.C]

Re: Grahams new old race car, bmw 2002 reborn

Watching and learning

[Graham]

Re: Grahams new old race car, bmw 2002 reborn



finsihed off repair at bottom of A pillar, although i havnt taken a pic, ive now replaced the section of sill cut away to do the repair.

[Graham]

Re: Grahams new old race car, bmw 2002 reborn

ive moved to the n/s/r sill now, being triple and even quadruple skinned in some points its real rust trap, as you can see a bit of minor scabbing on the outside got a whole lot bigger when i started cutting back to strong steel.





the rusty looking bits left are only surface, so will get a good clean up, coat of worm poison and generous waxoyling

[caprimentle]

Re: Grahams new old race car, bmw 2002 reborn

Thoroughly enjoying this thread, glad your making time for the old racing girl and bringing it back to life

[Graham]

Re: Grahams new old race car, bmw 2002 reborn

have been shopping, a partially successfully trip,

i picked up another 4.1 diff, its not a slipper but it will give me a spare diff if ever i need one in a hurry

not so good is that i travelled a couple of hours to get a close ratio dog leg 5 speed box which turned out to be a normal overdrive box

this has caused me to re think the whole gearbox thing, im now thinking of making an adapter plate so i can use a T9, it seems a backwards step to engineer the car to take a heavy not actually that strong iron box in place of the all alloy bmw box, BUT for potentially a vast cost saving over of getting a dogleg for the car, i can rebuild a T9 with a gear kit and get much more suitable set of ratios, and once a T9 will fit, then its an easy switch to either a caterham 6 speed or one of many different varieties of sequential box at a later date.


i also picked up a 2.0 crank, still std and not needing a grind, so that seals the engines fate for now 2.0 it is, with that crank 2.1 is a option, but as i only have later lighter/thinner walled m10 1.8 blocks a big bores not an option


and a 1602 head, no one, but no one uses these on a 2.0, as std they flow way less than a 2.0 head, but i know from previous flow testing that they can flow more than the 2.0 can without welding up ports, but to do so means fitting 8 new much bigger valve seats and about a weeks worth of grinding, a lot of the flow gain will come because bmw made the 1600 ports smaller so once you have put big valves in theres was more material to play with in the short turn, the only down side is they unfortunatly made the port od smaller as well as the id, so getting max flow risks breaking through, not to mention slight differences in manifold faces mean off the peg 2.0 manifolds, exhaust in particular cant be used

[Graham]

Re: Grahams new old race car, bmw 2002 reborn

not really an update, but ive been thinking about exhaust manifolds, and trying to find a big bore 4/2/1

my first 02 had a race 4/1 manifold, but the design of it always bugged me, 3 of the primaries are fairly close in length, but one was twice the length of the others, it clearly worked as i had 200bhp, and in RHD form with a steering box in the way its difficult to get a decent manifold in there.

it gave a power curve this shape

http://www.turbosport.co.uk/attachment.php?attachmentid=13600&d=1182884521

what ever i did with that engine the power graph was always the same shape, even changing cams didnt alter it, always big hicup in the middle of the power, just the more power i got the bigger the hicup. i ten moved onto other things and forgot all about it.

when i came back to N/A m10s it was with a bigger capacity, but this time with a 4/2/1 manifold. fundamentally other than the engine capacity there was little difference between the 2.0 and 2.5 engines, induction, cam compression all the same, even bhp per litre was close but no ugly dip/spike in the power curve

http://media2.turbosport.co.uk/2008/6/20090802105064099082.5%20m10.jpg

so ive been looking hard for 421 manifolds, which lead to an interesting email conversation with someone earlier, i was offered a choice of manifolds, the chap said the bigger bore one worked better at over 5000 rpm on engines upto 240bhp. i replied what sort of m10 have you dyno'd that gave 240bhp, i built one but that was a 2.5, he said

It was an original Schnitzer Group 2 engine from ’73 running some fairly naughty internals. I have no idea what compression ratio was, but the guys who owned it spent a long time mixing fuel up before running it.

wow, the goal posts have just moved!

tbh, i do recall a reading a snippet from vizard who said he once did some head work on one which gave 240bhp, which i rather dismissed knowing that figure to be a lot higher than anything claimed by any one else, so maybe it was true after all. obviously i cant use exotic rocket fuel, but it seems i need to be thinking of power north of 220bhp from just 2.0

[exboyracer]

Re: Grahams new old race car, bmw 2002 reborn

Good to see you back with a 2002 Graham, I'm looking forward to watching you progress with this one

[tkracing]

Re: Grahams new old race car, bmw 2002 reborn

Graham,,, what a small world, I tried to buy this car, think it was a Thursday night and he said it was sold couple hrs before....

Finger oot graham, I'd ave finished this by now lol.

[Graham]

Re: Grahams new old race car, bmw 2002 reborn

nothing much to report, ive been playing with a head on the flowbench



the head is question is the modifed one i used on my 2.5litre m10 build, ive tried more agressive porting, lost a little midrange flow and picked some up at the top end, going even more agressive picked up a whole heap of high lift flow, but way beyond where the valves will lift to, i also tried a bigger valve but without the agressive porting, that lost flow everywhere except right at the top again, so overall they dont improve flow. that im not suprised at because ive heard from several sources that oversize valves dont give anymore power, from what i can tell overise inlet valve will only hurt power unless you have custom cam ground. i wil however try the big valve with the very agressive porting.

[Graham]

Re: Grahams new old race car, bmw 2002 reborn

been hard at the flow bench again




i had hoped that i would see a big flow improve ment going from a 46 to a 48mm inlet valve, even though i had heard ther were no power gains to be had by going to 48mm,



unfortunatly the flow figuers dont lie the 48mm valve only really starts to work at very high valve lift, beyond where even schrick race cams lift to.
i started out with a fully modified port and 46mm valve (blue line) even more radical porting picked up flow at higher lifts (brown/redish line) trying harder still picked up a bit more at the very top and lost out where i'd preciously gained, 48mm valve (pink line) lost more of teh previous gain but picked up lift at very high lift around 550thou plus. it took a lot more work to make the 48mm valve work that well and as such i really do not think its worth exploring, its too big for the valve seats, needs chamber mods and without a one off cam giving insane lift its never going to give more power than the 46mm valve can,

curiously to make the port flow ive had to lift it up until its on the very edge of breaking through the top of the port, as its now a huge port you would expect that fillingthe bottom of the port in would be good, not so, low and middle lifts you can fill it in and it makes no difference, but high lift flow is damaged by lifting the port floor.