Royal with cheese

Motor is a B16 stock block with blox b cams with omni valvetrain revving to 9200.
My question is simple what was destroyed first: valve or rod? The rod broke in half and the piston was completely chewed up. A few weeks earlier the engine was revved to 10500rpm by driver error.
I'm guessing rod since i was stock and 9200 was probably a bit too high. I knew this was going to happen someday, engine served my well for over 4 years of road racing.

JCushing

what do the rods look like? big end or small end blue?

mgags7

Do those cams really require revving that high to make power??

I cant really tell from the pics what happened at all...they're not very informative....

JDM_teh_WIN!!

MMMMM Carnage!!!!!

JCushing

i can see going to 9200 in a b16 with those cams, they are basically skunk2 stage 2 copys.

DC2 Mang

I would think the rod went out first

JDM_teh_WIN!!

Did it sound like a box of wrenches falling down some stairs? Just curious.

WrongWD

iTrader: (1)

im goin with rod, the valve stem is still there, and its unlikely that the head of the valve just 'fell off'

Ruben19

there is no reason to rev over 9k with those cams
they stop making power at 8-8200k

JCushing

a stock b16 revs to 8k stock. ive seen graphs of BC spec 3+ cammed b16's make power to 9k, im pretty sure that the much larger blox b's would hold power farther than 200 rpm over the stock redline

Han Solo

skunk stage 2' make power around 8700 on b16's check !ll W!ll's build......

https://honda-tech.com/zerothread?id=1519846

NA_B18C1

man!! you guys are too REV HAPPY just like my brother in laws..thinking with just a couple of setups you can rev to 9-10000RPM???? you guys are crazy!! thats what happen when you don't do any research or know what the heck you guys are doing.

Combustion Contraption

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NA_B18C1 &raquo;</TD></TR><TR><TD CLASS="quote"> you can rev to 9-10000RPM???? you guys are crazy!! thats what happen when you don't do any research or know what the heck you guys are doing.</TD></TR></TABLE>

Thats a whole lotta RPM.

Anyway , as far as what failed first. If the valve failed first, usually it doesnt cause the rod to snap in half. The rod snapping in half definately could cause some valve problems on the other hand.

Secondly, as far as everyone reciting exactly where certain cams make peak power on certain engines, for these points to be valid at all, each engine would have to have identical heads (porting, VJ) compression, and bolt on's of the exact same brand, including engine management.

Royal with cheese

They definately hold power to 9000 rpm and even beyond! But i capped it 9200 because of the stock bottom end, which was still too high, i know.
It has a nasty dip at 6500, i've had that since i switched to a rage header from a DC4-1jdm. I was not able to tune that out. Rage gave me 8 hp more up top though. I didn't include the torque because it's in Nm and everybody would get confused.
The rod ends are not blue in any way. When it blew up i was at about 9000 rpm in second gear and then boom, a bit of smoke in the cabin and "a box of wrenches falling down some stairs", the end.
So to sum it up, it were probably the rods that failed. That's what i needed to know.

TurbanRacer

1th post bumppppppppp