this is total bs. i bought these cams brand new about a 1 1/2 month ago to add to my totally rebuilt b20-vtec. I had everything professionally installed. i properly broke the new engine in for 600 miles and then got my hondata tuned. on the way back to my house i downshifted and boom...broke the cam. i new it right away when i noticed my cam gears werent lined up straight. So when i took everything apart i unbelieveably saw it was in 6 pieces! this is insane. it broke exactly when i hit vtec so i was at around 5800rpm's. i checked all the rockers and they seem to be fine....they all lift up fine and none of them are popping up...so idk if that's an exact way to check if my valves are bent or not. i was wondering if there is any other way to check because i dont want to take the head off if they are fine. I guess leakdown test would be best right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by konrad &raquo;</TD></TR><TR><TD CLASS="quote"> </TD></TR></TABLE>


What the ****...? Damn..that's messed up.

 

yes it is fu**ed up. I have seen cams break before like into 2 pieces...but not 6. These had to be defective. I'm gonna give crower a call tomorrow to see if they are gonna replace this broken one...and exchange mine intake one for me since i'm not gonna take any chances...and possible any harm to my engine

 

What valvetrain were you running?

 

honestly..i dont think it was the valvetrain. I dont think that cam was straight. Was taht cam dropped at all? Because they "bend" easy. and will throw the cam off with u spin it and messure the mains. Thats all i can think of.

 

also give me EXACT specs to that cam... i might know why...
and also on the end of the cam it shoudl have a number marked into it give me that number.

 

i was running all crower valvetrain...crower springs and titanium retainers. the car was running fine when street tuning and on the dyno...vtec engaged fine but i still can't understand how this could happen. and no the cam was never dropped or anything before installation.

 

specs are...
Advertised Duration- Int- 305 mid Exh-305 mid
Duration @ .050"- Int- 263 mid Exh-255 mid
Gross Lift w/1.55- Int- 468 mid Exh-468 mid

also my valvelash was adjusted to crower's specs as well


Modified by konrad at 6:57 PM 5/22/2005

 

DAMN!.....crower

 

Did you clay the engine with Vtec locked.........It sounds like the valves hit the pistons to me. I mean they broke right with vtec lift was in. How much were the cam gears adj. What was your TDC 0 deg. or what? Was the head milled?

 

sorry to here give brian a call i am sure he will give you a new set

 

yes it was clayed and all the clearances were checked. I was using stock cam gears an no the head wasn't milled. I am using a pr3 b16 head w/ a b20z2 block..12.5:1 je pistons w/ a oem 3 layer head gasket. The weird thing is all the rockers look fine...they aren't sticking up or anything. I compared them to the intake side and they look the same and feel the same. Vtec was running fine before on the dyno and while street tuning it...it's not like this was the first time vtec engaged.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dohcter g &raquo;</TD></TR><TR><TD CLASS="quote">Did you clay the engine with Vtec locked.........It sounds like the valves hit the pistons to me. I mean they broke right with vtec lift was in. How much were the cam gears adj. What was your TDC 0 deg. or what? Was the head milled?</TD></TR></TABLE>

 

what year is that Pr3 head? bad LMA's will cause your cams to break

 

just seen this **** on b20...damn good luck.

 

it's a 92 pr3 head
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1.6i &raquo;</TD></TR><TR><TD CLASS="quote">what year is that Pr3 head? bad LMA's will cause your cams to break</TD></TR></TABLE>

 

i think your head is ok b/c it broke on the lobes and not on the bearing part of the cam. so if the caps look good then you should be ok. just make sure you check/replace any damaged or scarred rocker arms.

and BTW if you do need rocker arms i have some ill give you.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by konrad &raquo;</TD></TR><TR><TD CLASS="quote">it's a 92 pr3 head
</TD></TR></TABLE>

first gen head.. smaller LMA's prone and known for seizing up and breaking cams with higher lift...check em out..your gonna have to pull the shafts and rockers to get them out..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1.6i &raquo;</TD></TR><TR><TD CLASS="quote">

first gen head.. smaller LMA's prone and known for seizing up and breaking cams with higher lift...check em out..your gonna have to pull the shafts and rockers to get them out..</TD></TR></TABLE>

Damn, thats destruction...

I never thought bad LMAs would destroy cams, I was always under the impression that a Bad LMA was just simply noisy and annyoing. I had bad LMAs for 7k miles, and my cams and rocker arms were just fine. Replaced LMAs with a some Prelude spring type LMAs about 6 months ago.

 

Not bad lma's. Just old, they bind up because they cant handle as much lift as the newer ones.. I'm not going to say that happened here, but it does happen.. This isnt the first time the crower cams have broken, it used to be pretty common here on HT.

 

Those are 40302s?

 

yea they are the 63403-2's

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EG6R &raquo;</TD></TR><TR><TD CLASS="quote">Those are 40302s? </TD></TR></TABLE>

 

damn that sucks, im suck crower will help. i heard they haev good customer service

 

PM sheepey if you really wanna know why cams do and do not break.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EVOL &raquo;</TD></TR><TR><TD CLASS="quote">PM sheepey if you really wanna know why cams do and do not break.
</TD></TR></TABLE>

Mr. Web Cam

 

bummer