kevinz

not tring to step on any toes but I would put some blame on the builder, the p2v clearances were to close, next time have your builder AND tuner know whats in your motor, lesson learned, now get that beast together, good luck

freakyty2.3

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kevinz &raquo;</TD></TR><TR><TD CLASS="quote">not tring to step on any toes but I would put some blame on the builder, the p2v clearances were to close, next time have your builder AND tuner know whats in your motor, lesson learned, now get that beast together, good luck</TD></TR></TABLE>

I put 100% blame on builder himself. You can't just jump out there building big motors with PRO cams without checking clearances. If you don't do P2V on every motor no matter cam size then your asking to blow up in the high RPM range. Even if you have it built at a shop and tuned elsewhere you need to know whats going on and let the tuner know the clearances so he knows what he can and can't do with cam gear adjustments. Good luck on rebuilding bro its a part of racing trust me I've learned from some of the same issues.

HmgLauj69

"The master honda tech and the tuner said.the valve guides were bad"

i also think the problem was piston to valve clearance. but since the head is off why dont you take the valves out and inspect the stems.

mar778c

iTrader: (1)

That looks like valve to piston contact to me.

ENDYN

you can see where the intake valves were "dusting" all the pistons. When there's any sort of contact (piston to valve, or valve to valve), it's just a matter of time before fatigue will cause a valve to break....

b16nonoy

I think it was valve train....the other 2 pistons are fine..no valves hit those pistons...they are clean...

b16nonoy

I think if it was piston to valve clearance probs..all 4 or at least the other pistons should have looked the same too...

alterdcreations

the only way they would have looked the same is if they hade holes in them.

are you going with lighter pistons next time around?

Hulk3000x

yea last time i tuned my c5 coupe the guy running the dyno left a rag near the timing belt and on the third run ..... sucked it in and through the timing belt,it bent 12 valves b4 the motor stopped turning on its own.... they paid for there mistakes!!!

Rusty Shackleferd

sorry to see this Nonoy....who tuned the car if you dont mind me asking?

Runnerdown

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16nonoy &raquo;</TD></TR><TR><TD CLASS="quote">I think if it was piston to valve clearance probs..all 4 or at least the other pistons should have looked the same too...</TD></TR></TABLE>

Its very clear to see, the pistons have marks where the intake valves hit. The ones that hit the hardest probably broke first.

Phil M

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

Its very clear to see, the pistons have marks where the intake valves hit. The ones that hit the hardest probably broke first. </TD></TR></TABLE>

And the ones that hit first made the timing belt slip....

shad0wslay3r

I'm reading this in sort of a depressed state.. I blew my dirtbike up today, and I was disapointed. New topend kit (piston and gaskets) is $60.. bore .010 to get rid of the scar.. $100 with hone..

I feel even worse to see how much this would cost you!

egseis

damn that sucks. for your next build pick one builder you trust instead of jumping from builder to builder that way he knows exactly what hes working on.

DAneronimo

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by egseis &raquo;</TD></TR><TR><TD CLASS="quote">damn that sucks. for your next build pick one builder you trust instead of jumping from builder to builder that way he knows exactly what hes working on.</TD></TR></TABLE>

exactly! for me; whoever builds tunes it....otherwise all you get is a lot of finger pointing.
oh and you absolutely had piston to valve contact as i and many others have already stated...
good luck with the next one

b16nonoy

I am not sure what pistons I am going to buy.. I think I am going to drop my old motor back in...I am going to get rid of my sleeved block..and buy a new b16 motor possibly from hmotorsonline.com... and go with a stock size piston..most likely JEs again....

team1320_k26eg

ouch... had this happen to me back in the day around 1999 or 2000 i dunno remember... i had a low budget b16a build with itr retainers + 9200k burn out box= ... damm those itr retainers