24V = smithereens after 50 hours of racing

[kronus]

probably less, but not by much. Haven't weighed it, probably would be good to at least corner weigh the fucker.

here's eyesore's flight:

[2mAn]

Is the Rabbit the one with the VR6? My buddy Shawn is part of that team

[kronus]

sometimes-judge shawn rogers? I know that guy!

[dirty30]

I wish everyone would take this thread more seriously, I mean this is LEMONS we are talking about here. News of this engine failure could make it to BMW AG, and then what? Some corporate heads are gonna roll thats what.

[nrubenstein]

Guys, the reality is that 50 hours of racing is pretty good. Not great, but pretty good for a motor that was tossed together.

[kronus]

for real, it's a lot better than I've been getting out of our raced M30s. oil starvation in left handers is a bitch.

[2mAn]

sometimes-judge shawn rogers? I know that guy!

yessir! good friend of mine. Ive known him since my VW days!

Guys, the reality is that 50 hours of racing is pretty good. Not great, but pretty good for a motor that was tossed together.

this is true.

[kronus]

yessir! good friend of mine. Ive known him since my VW days!

awesome, he's a great guy. (but no, that's not his rabbit. I did encounter it on track once last weekend, they blew our doors off, that thing is absurdly quick now)

[whodwho]

the vorshlag style through-bolt mount with poly sandwiched between metal cups is probably the best approach I've seen.

nahh, got to go with hockey pucks - true Lemons style!!

[Wanganstyle]

Guys, the reality is that 50 hours of racing is pretty good. Not great, but pretty good for a motor that was tossed together.

not really tossed togeather; this is a proper lemons engine and probably very close to the average r3vswap 24v;

an unknown prior life junkyard engine that had no non bolt on new parts added - for it to live 50 hours and implode is pretty damm good.

[roguetoaster]

Not exactly the same, but our all stock, never rebuilt Chump raced M42 has had just over 70 hours on track (and has been crashed/reinstalled in a new shell) after being used on the street for ~130k miles. It made good enough power to get 4th at Daytona last year.

When you rebuilt it what did you do with the valves?

Considering how closely these two engines are related I simply wonder if was simply down to you run solid mounts, we run rubber?

Best of luck with the repairs.

[TobyB]

valve spring retainers are not strong enough for over 7,000 rpm redline

A local bunch found that out, too...

t

[Wanganstyle]

Not exactly the same, but our all stock, never rebuilt Chump raced M42 has had just over 70 hours on track (and has been crashed/reinstalled in a new shell) after being used on the street for ~130k miles. It made good enough power to get 4th at Daytona last year.

When you rebuilt it what did you do with the valves?

Considering how closely these two engines are related I simply wonder if was simply down to you run solid mounts, we run rubber?

Best of luck with the repairs.

M42 has better parts for springs; they are shared with s52 and s62

11341403709

[roguetoaster]

M42 has better parts for valves/springs/retainers iirc; they are shared with s52 and s62

Really?? I'd not heard that before.

[Wanganstyle]

Really?? I'd not heard that before.

4 bangers and M cars unite:

Part 11341403709 (VALVE SPRING) was found on the following vehicles:
E36: Details on E36
E36 M3 Sedan
E36 M3 Coupe
E36 M3 Convertible
E36 318i Convertible
E36 318i Sedan
E36 318is Coupe
E36 318ti Compact
E39: Details on E39
E39 M5 Sedan
Z3: Details on Z3
Z3 Z3 M Roadster
Z3 Z3 M Coupe
Z3 Z3 1.9 Roadster

Not exactly the same, but our all stock, never rebuilt Chump raced M42 has had just over 70 hours on track (and has been crashed/reinstalled in a new shell) after being used on the street for ~130k miles. It made good enough power to get 4th at Daytona last year.

When you rebuilt it what did you do with the valves?

Considering how closely these two engines are related I simply wonder if was simply down to you run solid mounts, we run rubber?

Best of luck with the repairs.

I think our valvetrain failure has not so much to do with the solid mounts; approx 40hrs @6,000 + 10hrs @7,000 on a stock 6,000 engine is the cause.
a 4 cylinder has a much higher OEM rev limit so it's not a very fair comparison - the max OEM rev limit for a m52 family engine is 6430rpm in 3/4/5 gears (its 7000 in 1/2 gears but those are moot)

I would think the solid mounts prevented some mis-shifting that might have hurt the valvetrain more; BUT they contributed to destruction of the oil pickup tube

This would be best solved by a non cast AL material tube that is more vibration resistant; a braced steel pickup made from M52 e36 rear sump for front use might be the best solution.