24V = smithereens after 50 hours of racing

[Bullhead]

The fact that it finally gave out at 2k on a lift has no bearing on when the damage was done.

Yeah I have dropped a valve before in some of my sbc's at idle after a hard run (1/8th mile) and sense they are minimal clearance motors it makes a real mess. All it take is for one little bitty retainer to give up the ghost and you have yourself some piston spaghetti goodness.

[Northern]

Beat the fuck out of a stock engine for 50 hours + 7k rpms + solid mounts = you're probably gonna have a bad time.

[Jb325is]

The fact that it finally gave out at 2k on a lift has no bearing on when the damage was done.

^This

Wangan you seem to be wealth of knowledge in some areas, but you also seem like a pretty massive douche, that's too bad. Don't limit your revs to 6k, that's a very stupid thing for an intelligent person to do. Put a memory tach in your race car, check it every now and then, you'll be surprised. Have a wonderful evening

[LJ851]

The fact that it finally gave out at 2k on a lift has no bearing on when the damage was done.

[Wanganstyle]

Are you saying you have difficulty with reading comprehension? :P

Actually we discussed this engine earlier, and I was surprised it happened on a lift.

Where's my dog ears? ;)

Ya it was a shocker..thank god for kill switch in regulation position as I was in in the car and didn't want to hit any teammates in the eye w a broken rod.

I an on attack track this week to find those plates!

[ForcedFirebird]

I guess being Involved with a real race car makes reading comprehension difficult

Are you saying you have difficulty with reading comprehension? :P

Actually we discussed this engine earlier, and I was surprised it happened on a lift.

Where's my dog ears? ;)

[Wanganstyle]

Somone asked about overrevs earlier, and you mentioned raising the stock rev-limiter but I think he meant missed down shifts. It's extremely common in "real racing" and co-drivers always seem to forget about mentioning it. I work with "real" race cars quite a bit and solid mounts should not be grenading your motor. One or two 5th to 2nd downshifts though and that's what you usually end up with

Real or not real race car the failure was observed by 6 human beings as the car was in in the air on the lift.

The car was running just fine until it dropped a valve at 2,000 rpm with all 4 wheels in the air.....in neutral.

No miss shift here. Clean stress failure of valve spring retainer

I guess being Involved with a real race car makes reading comprehension difficult

[gazellebeigem3]

Root cause analysis is for the birds. Obviously it just exploded because old and solid mounts. Not because it was mechanically over revved or "built" without a proper eye for details etc etc

[Jb325is]

We put memory tachs in the trunks of our rental cars. And yes, I know someone who had a similar story with a one-weekend Grand Am ride. Ended up costing 20k

[djjerme]

I work with "real" race cars quite a bit and solid mounts should not be grenading your motor. One or two 5th to 2nd downshifts though and that's what you usually end up with

That's why many of the larger teams run data loggers, and have clauses in the contract for "Money shifting" and clutch dumping to decelerate. Had a buddy have to buy a Grand Am motor because he over rev'd by a couple hundred RPM - and the motor blew in the race. Doesn't matter what the cause was - he violated the contract, so had to buy it..

[Jb325is]

Somone asked about overrevs earlier, and you mentioned raising the stock rev-limiter but I think he meant missed down shifts. It's extremely common in "real racing" and co-drivers always seem to forget about mentioning it. I work with "real" race cars quite a bit and solid mounts should not be grenading your motor. One or two 5th to 2nd downshifts though and that's what you usually end up with

[jalopi]

if $0 is the budget I'd see if you can't find hockey pucks as someone else mentioned - yeah they're pretty much solid, but IMO they're much better than literally solid aluminum/steel mounts

if I don't sell/part-out my car/moneysink/POS I'll probably be getting some kind of r3v limiter for my junk.

[Wanganstyle]

What I got was OP said

Beat the fuck out of a stock engine for 50 hours + 7k rpms + solid mounts = you're probably gonna have a bad time. I can agree with the solid mounts statement, never been a big fan of those. Also, I did alot of reading on a Ford forum about high RPMS killing blocks - pretty much everyone's consensus was that if you keep it at a max of 6k rpms the stock block will last much, much longer. So yep, gonna have to agree with the 7k thing too

IMO 50 hours isn't too bad though, that's way more than what some teams let their engines go before doing a rebuild. Then again, I'll bet they have a
slightly higher budget than a lemons team

so cool you know how to read!
much wow!

7k killed our junk engine quicker than 6k would have - this is the communication yes! :)

50 hours was actually pretty good for a junk m52 with no money put into it.

Next engine will be limited to 6,000 rpm and hopefully we can make some delrin dampers for the solid mounts or a tubular pickup to prevent break down.

Solid mounts is suxor but when u have a budget of $0 and they are $0 then its kinda self limiting............

- lemons budget is pretty low; kaboom is normal. I don't understand why some r3vtards don't get it?

you race lemons = will blow up

[jalopi]

What I got was OP said

Beat the fuck out of a stock engine for 50 hours + 7k rpms + solid mounts = you're probably gonna have a bad time. I can agree with the solid mounts statement, never been a big fan of those. Also, I did alot of reading on a Ford forum about high RPMS killing blocks - pretty much everyone's consensus was that if you keep it at a max of 6k rpms the stock block will last much, much longer. So yep, gonna have to agree with the 7k thing too

IMO 50 hours isn't too bad though, that's way more than what some teams let their engines go before doing a rebuild. Then again, I'll bet they have a slightly higher budget than a lemons team

[Bullhead]

I don't race in Lemons but this is some good reading. From my stand point it seems the OP is just saying that solid motor mounts may not be the best solution, imo I have not heard him say BMW engines suck or are unreliable 1 time. I could be wrong and please correct me if I am OP. I am sub'd though this is some good stuff, and that Rabbit launch was intense, I would think even more so for the guy in the yellow car lol.