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

[mk1 gaz]

Re: worlds most powerfull bmw 316?

heavy gauge tubes are fine dave , you can use the bends from high pressure water + gas pipe suppliers to make manifolds . These ones have an angle at each end so when butted together you can fill the angle wilth weld and get a very strong joint . Then support the weght of the turbo's from secure engine brackets from underneath . Most importantly you need an expanshion joint where the manifold joins the downpipe due to the horrific heat generated from long periods of track day full throttle antic's . This also helps as the engine will twist and flex the exhaust at these points cracking it off everytime

[Graham]

Re: worlds most powerfull bmw 316?

its amazing what heat and expansion will do, the cracks in my manifold are in 5mm thick steel.

at the moment the hope is to get to the end of the season and start again from another angle, possibly making an adapter plate to use a Yb manifold

[Graham]

its looking like i've killed it



for the last few meetings power seems of of dropped off and i've not had full boost, prior to brands i had a good look around the motor and found nothing wrong, but decided to re plumb all the small bore boost control piping, i pressure tested every thing but couldn't find any leaks, until i checked the dump valve which was leaking, so i removed it, and headed for brands the next morning.

#
practise was really busy, it was very difficult to find some clear track, the car felt good, then i checked the boost gauge, YIKES 1.8 bar percy: i thought, and knocked the boost back, a lap later the water temp was a bit on the high side, i backe doff for a bit, it dropped back, and i gave it some, a lap or two later it missed a couple of times so i pulled off, it then errupted in a cloud of steam,

back in the pits it was clear the head gasket was fooked big time, trouble is the rings seemed to be as well as it now needed a huge amount of cranking to restart it.

was the gasket already going or did the extra boost do it, it certainly wouldn't of helped, sadly the extra boost would of been why the car felt good rather than awesome as extra boost beyond the normal high reduces power.

done a cylinder leakage test this morning, bad news, the best cylinder has 80% leakage, the others 95%, a compression test backed it up, i know the gasket is dead as air from the leakage test is going straight in the cooling system, but i'm struggling to believe that it can loss so much compression through the gasket without any other problems, time to take the head off

[david_white]

Re: worlds most powerfull bmw 316?

Sorry to hear that Graham, lets just prey that its just the gasket and you'll be sorted ready for the next race pray:

[Graham]

Re: worlds most powerfull bmw 316?

update,

i lifted the head, the gasket was definatly blowing, in an effort to see just how much compression was being lost through the gasket, i dug out an old gasket, covered it in sealant, and bolted the head back on minus cams etc, and repeated the leakage test, better but still not good, i could hear the valves leaking the air through the manifolds, so i definatly know i also need to recut the valves seats and get the head refaced, think im going to have to pull the pistons out

[mk1 gaz]

Re: worlds most powerfull bmw 316?

back luck graham , the rise in boost pressure sometimes cracks the block if they've been bored out alot . On the 1900 cc rs turbo conversions the blocks crack the bore into the water jacket over 20 p.s.i. , how strong is an m3 block ? Can it cope with the extra heat and cylinder pressures if bored out and at 1.8 bar of boost pressure ? Hope you fix it soon

[Graham]

Re: worlds most powerfull bmw 316?

the blocks ok no cracks i can find, bmw did uprate the m3 block compaired to the m10 its based on and the block itself is only 0.4mm oversize

i made up an adapter plate, and did a cylinder leakage test on the bottom end with the head off, 70% of the compression loss was through the valves and gasket itself, the valves are easy fixed by re cutting the seats, the rings arent sealing as well as i'd like, which means pistons out to check/re-ring, the block could also do with decking to make the o rings sit a bit prouder and bite harder into the head gasket, which means a total engine strip, i may well just take the rest of the season off, as i want to make a few other changes, such as exhaust manifolding which isn't going to be straight forward, i want to change one of the cams, and the whole lot is going to have to go back to the rollers to be set up again,

oh and i'm absolutly skint so the £2000 it would cost to just chuck it back together and finish the season without any improvements, seems a poor return that fig includes entry fees, fuel for race and tow cars etc, and i would still need to do an end of season strip on it.

me thinks its better to forget the rest of this season and hopefully come out punching hard in 2007

[david_white]

Re: worlds most powerfull bmw 316?

Really sorry to hear that you might miss the rest of the season Graham, its a loss for the championship. Its the right thing to do though as if you carry on it will cost a lot of money and ultimately probably kill the engine for good.

Good luck with the rebuild, it'll come back faster and stronger than ever and just think you'll be lined up on the front row of the grid alongside me for the first race next season ... what?

[mk1 gaz]

Re: worlds most powerfull bmw 316?

make it road legal while your at it graham , then you can take it out more often without killing it everytime , as you can only floor it now and then for short bursts

[david_white]

Re: worlds most powerfull bmw 316?

make it road legal while your at it graham , then you can take it out more often without killing it everytime , as you can only floor it now and then for short bursts

If 30 or 40 laps in a day over a minute each driving fully on it is short bursts what do you call 13 secs in a straight line

Dont think grahams clutch would like popping down to tescos either.
Mind you you'll be in the same boat soon Gaz with a full race motor and all the race transmittion required to deal with it, not rush hour friendly

[mk1 gaz]

Re: worlds most powerfull bmw 316?

i meant short bursts on the street , it's the flat out driving around the track that's killing it . I'm going to still use mine on the street for sure , i've got / had cars with race clutches and they're not too bad if you know how to treat them

[Graham]

Re: worlds most powerfull bmw 316?

i meant short bursts on the street , it's the flat out driving around the track that's killing it . I'm going to still use mine on the street for sure , i've got / had cars with race clutches and they're not too bad if you know how to treat them

hmmm theres race clutches and race clutches, mine is a twin plate sintered rigid paddle, it will only do on or if, if you try to slip them they will die in a matter of seconds, it is imposible to pull away at any speed without any wheel spin or a stall

[mk1 gaz]

Re: worlds most powerfull bmw 316?

you can get nice user friendly twin plate clutches that will hold your cars torque easily , pricey though mate ...............

[Graham]

Re: worlds most powerfull bmw 316?

what to cope with over 400lbft and to fit my ultra light flywheel which only takes a 7.25inch race clutch, anyway the beemer is way too far modified to ever go back on the road.

why would i want to anyway if i really want to go fast on the road i use this, which is a gsxr 7/11
it started out life as a gsxr 750, but has since had a 1200 bandit engine, bigger 38mm carbs k+n's 1100r cams and a pipe fitted now chucking out around 145-150bhp, its the only think that to me feels faster than the beemer

[Graham]

Re: worlds most powerfull bmw 316?

or this