Finally broke one - 918 :)
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
At proper seating specs, those 918's will take over .600 at 7K rpm all day.
One thing is to make sure you let them reach operating temp before thrashing on them.
I will be doing another motor soon and 918's will be in there again
One thing is to make sure you let them reach operating temp before thrashing on them.
I will be doing another motor soon and 918's will be in there again
My stock motor dropped a valve because I didn't recognize a broken spring. When its an unplanned repair it hurts. I've broken three sets of springs except the 918's and I have the rev limiter set at 6700 and rarely bump it. My cams have all been very, very mild. LPE gt-2, Lunati 230 545/114 not big at all. Next time really, don't keep driving it if you break a spring. I'd rather pay $50.00 for a tow than $3500 for a motor.
Thread Starter
TECH Senior Member
iTrader: (7)
Joined: Jan 2002
Posts: 12,754
Likes: 0
From: Katy, TX
Truthfully guys, this has been somewhat of an "experiment" for me, ever since we saw the several batches of spring breakage a couple years back. I installed this early set of 918's amidst all the failures, "to see if they hold up." When they lived, I started camming up. After 35,000 miles, I'd say I went past their usable limit and I've been saying for a year that they probably should be changed out. If I would have hurt the shortblock by dropping a valve, that's part of the game. It could have happened the instant the spring broke, or it might never have -- it is always a gamble. I wouldn't recommend driving to work on it to anyone, even though I did it 
Glad ya didnt hurt anything....... That -2cc helped i bet..... i know that -15cc dish i have would help a lil if i ever did break one of mine.... but there duals so i have a lil more piece of mind and thats all there for 
Kyle
Kyle
