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Originally Posted by ecoli
There are 2 balance shafts. Only one of them is driven off the BS belt. So, if you just cut that belt, then one will still be spinning and the motor will probably vibrate quite badly. Running a turned down ballance shaft is good for keeping the same oil pressure, doing it for other reasons is debateable. The oil pump gear does not directly run the balance shaft, so there isn't tremendous sideloading on it. Most of the high HP guys have had no problems with stubby style shafts with the oiling groove, even at very high RPMs. There are cheap eliminator kits out there though that have stub shafts with no oiling groove though.
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It just likes to drive one of the oil pump gears that sometimes turns inside the oil pump housing. It is a hit or miss problem.
We offer the turned down balance shafts. Mike at QPR had a critical mistake in his original design. A few members on here have run into the problems his design has created. Our balance shafts aren't turned down that far. This will eliminate the chances of having them bend during the machining process (QPR had a few balance shafts come back bent), or having it bend during extreme over-rev conditions (something that is possible due to the lack of "meat" on the b-shaft). We are now just having the counterweights cut down.
The stub shaft also works very well, it is really just a personal choice, thats why we offer both. Both methods work extremely well, if done correctly. Just simply cutting one of the belts is not the correct way to eliminate them.
Hybrid Mode
