Rev Limiter ???

[4bangerhotrod]

these engines rev really quick with no load on them. so if your at a lower rpm when something breaks the engine gains rpm amazingly quick just because the chip cuts fire to it doesnt mean the chip is going to grab the crank and stop it from turning faster than the # thats printed on it, its called momentum, its really hard to slow something down thats spinning that fast. think about it its commonsense which is what seperates alot of racers cause besides from driving abilitys most of the things on these cars use commonsense to figure out how a setup or anything on the car will work or react. these engines will free rev past the chip, but if your going past your chip by thousands of rpm you may have something wrong.

[Clark8669]

An MSD rev limiter with the engine at whatever chip you put in box give or take 100 rpm. The motor being loaded or unloaded has nothing to do with how it works. It will cut the spark to random cylinders to keep the engine at that specific rpm. And it doesnt hurt the engine to put it up on the chip for a few a few seconds. Thats the whole point of the system. For example when drag cars do burnouts and stage they put the motor up against the chip till the light turns green. And that can be for up to ten seconds at times

[LowTechRacing]

these engines rev really quick with no load on them. so if your at a lower rpm when something breaks the engine gains rpm amazingly quick just because the chip cuts fire to it doesnt mean the chip is going to grab the crank and stop it from turning faster than the # thats printed on it, its called momentum, its really hard to slow something down thats spinning that fast. think about it its commonsense which is what seperates alot of racers cause besides from driving abilitys most of the things on these cars use commonsense to figure out how a setup or anything on the car will work or react. these engines will free rev past the chip, but if your going past your chip by thousands of rpm you may have something wrong.

The rotating assembly could just spin free if it didn't have heads. But the engines your talking about are light weight, high compression, and tight tolerances. The light weight means it has less momentum. The high compression forces push down while the piston is coming up slowing it. If no spark from the ignition to light the af mix you just slowed the engine down. Momentum is not enough to over come a rev chip by thousands of rpm's. To many things working together to slow it down.

[4bangerhotrod]

compression is the reason it wont rev thousands past the chip but theres so much momentum thats the reason they will rev a few hundred past the chip if something breaks. ive seen it happen way to many times and it's usually between 200-400 rpm past the chip if the engine is down in the rpm range when the part lets go, but if its close to the chip when it lets go it usually wont go past the chip.