MS3 and no flycutting...Valves, say hello to Mr. Pistons.
#1
MS3 and no flycutting...Valves, say hello to Mr. Pistons.
I disassembled an engine because the ringland on #7 broke from too much nitrous. The engine also had used an MS3. 3 of the 8 pistons had marks on them from the valves hitting, some worse than others.
The heads were stock other than PRC golds and Titanium retainers, rev limiter was up near 6800 or 7000.
I can get pics later on. Just some info for you all.
The heads were stock other than PRC golds and Titanium retainers, rev limiter was up near 6800 or 7000.
I can get pics later on. Just some info for you all.
#5
Banned
iTrader: (1)
Exactly. That's why minimum recommended clearance is .080 intake and .110 exhaust. And with excessive float, you can STILL kiss the pistons. Cut it closer to the "well it's not hitting at idle it must fit fine" clearances, and all it can take is 1 over rev or missed shift and OOPS you've got eyebrows in your pistons!
#6
TECH Senior Member
Exactly. That's why minimum recommended clearance is .080 intake and .110 exhaust. And with excessive float, you can STILL kiss the pistons. Cut it closer to the "well it's not hitting at idle it must fit fine" clearances, and all it can take is 1 over rev or missed shift and OOPS you've got eyebrows in your pistons!
#7
TECH Senior Member
iTrader: (23)
Join Date: Aug 2005
Location: Watertown, NY
Posts: 8,797
Likes: 0
Received 0 Likes
on
0 Posts
Wheres all those guys here that always tell me that PTVC really isnt that big a deal?
Me personally would not run any cam other than like a 224 ish one without some cut in the pistons and clearances verified, just my personal preferance.
Me personally would not run any cam other than like a 224 ish one without some cut in the pistons and clearances verified, just my personal preferance.
Trending Topics
#10
TECH Senior Member
No, but it is borderline on the safe street PTVC. As long as your valves are controled correctly, no float, it is very safe; this is why it is important to keep an eye on the valvetrain and do yearly checks on spring pressures and such.
#12
12 Second Club
iTrader: (14)
Join Date: Sep 2005
Location: ILLINOIS
Posts: 1,193
Likes: 0
Received 0 Likes
on
0 Posts
Wow thats crazy. I am very thankfull of this information now. Most likley I will be doing my heads at the same time as a cam but this is good stuff to know. I gotta let my buddy that just put his MS4 in know about this. I hope everyone that preaches big cams read this, its good stuff. You wouldnt happen to have any pics of this tear down would you?