we all know that once in a while you just get a shitty batch of cams.

but what about improper seating of the valvesprings or valves at the wrong lash settings?

if you got coil bind, could that cause enough stress on the shaft to to break?

just thoughts... whata you guys think????

 

poor installation

 

Cams can be manufactured incorrectly, they need to be heat treated perfectly, or else they will become brittle or soft. Poor install will snap a cam, but it ain`t rocket science to install a set of cams, its either right or its wrong.

If your valves were too tight, the car would`nt run, period. It would`nt find an idle. Too loose is bad too, all the conditions you are describing are culprits of breakage, so any of the above scenarios *could* cause it i guess...

 

appearantly, you can get the cams to break by using the wrong LMA as well... which causes bind

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by advanracing62 &raquo;</TD></TR><TR><TD CLASS="quote">appearantly, you can get the cams to break by using the wrong LMA as well... which causes bind</TD></TR></TABLE>

I was waiting for that.

IMO, that is a very circumstancial point of view that requires alot of different factors. I don`t believe that will cause a cam to break, but that`s just my experience.
I have yet to see an objective report on the issue, and until then, I don`t buy the theory.

 

i havent yet bought into the LMA theory either. i ran on 88-91 JDM b16 LMA hitting 10,000 for over a year. no problems...maybe i was on barrowed time, who knows.
this will be a speculative issure that needs to be PROVED. not just stated.

 

Breakage of cams has alot to do with the cam blanks themselves and machining. I'll explain more in a "Cams 101" post one of these days.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rocket &raquo;</TD></TR><TR><TD CLASS="quote">Breakage of cams has alot to do with the cam blanks themselves and machining. I'll explain more in a "Cams 101" post one of these days.</TD></TR></TABLE>

man please do, i love it when people so huge write ups on not so common subjects.

 

yeah,

I am contemplating

Cams 101
Pistons 101
Spark Plug 101
Con Rod 101
Clutch 102
Bearins 101

I just need to get a break from all the OT I am working nowadays.

 

ya, you should start that series...i really wanna learn more about spark plugs and how to read em...

 

I've never really bought the thory, but then I'm running JUN III in a first gen B16 head with first gen. keepers, and LMA.... been that way for a year now....

 

as an amature engine builder i have yet to believe any one of the theories. i have had JUN 3 cams in a 00 B16 head and a 01 ITR head. i never checked install height on the valve springs in either head. obviously the B16 doesnt have ITR LMAs so that eliminates that theory as far as im concerned. both heads went on the exact same motor. i have had the cams for almost 3 yrs. about the first yr they were on the street and strip. now they are in a strip only car revving upwards of 9600. so basically i have come to the conclusion that its a bad batch of cams cause with all the breakage goin on, none of it has found its way to my cams.