my buddy just got some toda spec a cams put in his b16 and he didnt upgrade his valve springs. well his car broke down and one of my other friends said he may have just chewed up a valve. i dont know too much about this stuff but what possible damage could he have done to the motor? thanks in advance.

 

only way to really know is to pull it apart... it could be a hundred things.

 

i understand that but what usually tends to happen in cases like this? any info is appreciated

 

could be one of the following:

timing belt, spun bearing, broken Connecting rod, melted piston, stuck valve from improper valve springs which hit the top of a piston demolishing the piston and messing up the buttom end.

quick thing to do is check the dip stick.. if there is any metal flakes in the oil, salvage the cams, and throw out your motor

 

what happened when he broke down,did he over revved? need more info?

 

he was racing another car. he shifted into 3rd gear and then let off at about 6 thousand rpms because he had already won. but right before he let off we heard a pretty loud pop. it almost sounded like something fell off the car. and then we noticed the car wasnt on anymore. the spark plug in the second cylinder from the left was pretty much smashed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by theswarm &raquo;</TD></TR><TR><TD CLASS="quote">he was racing another car. he shifted into 3rd gear and then let off at about 6 thousand rpms because he had already won. but right before he let off we heard a pretty loud pop. it almost sounded like something fell off the car. and then we noticed the car wasnt on anymore. the spark plug in the second cylinder from the left was pretty much smashed.</TD></TR></TABLE>

Sounds like a dropped valve to me! I bet when you remove the head....there will be a nice size hole right thru your piston....
Welcome to the world of rebuild & replace!!!!

 

so would that be all that would need to be replaced just the piston and the valve? or is there a chain reaction of things that get messed up? thanks for the help guys

 

and since were on the subject of pistons what all is needed to put ctr pistons in a stock b16 bottom end?

 

Did you check the oil dipstick like i told you too?

Yes it does sound like a blown motor to me... If you are lucky, you may be able to machine the cylinder walls. replace all the pistons, possible con rod could be fuked too. If the head isnt todally destroyed, you may be able to have it fixed, but that costs a lot of money.

Pull the head off the motor, find out whats broken, and then post pics so people can give input.



Modified by B16B at 9:30 PM 4/14/2003

 

yea the dipstick looked fine...nothing on it but oil

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by theswarm &raquo;</TD></TR><TR><TD CLASS="quote">so would that be all that would need to be replaced just the piston and the valve? or is there a chain reaction of things that get messed up? thanks for the help guys</TD></TR></TABLE>

Its hard to say because most time its a chain reaction...
for instance, the valve drops into the chamber causes the piston to smash the valve into the head and destoying the sparkplug resulting in a hole thru the piston. (thats pretty much what I figured happened from your description)
Now the analysis:
For sure the head is jacked since you mentioned the spark plug got smashed.
1. Take your motor apart and have a machine shop look at it to see if its worth repairing.
2. Also see how many other valves in that chamber got fawked.
3. Also see if the debris got sucked into the other chambers causing other valves to be damaged.
4. Also look to see if you bent the connecting rods. Ask the machine shop to do a "balance and inspect" to determine this.

See if you can post some pics of the damage when you take apart the motor. I would like to see.

 

alright thanks...ill try to get pics up as soon as we take it apart

 

Selling the As? PM me I want em...

 

no sorry im gonna hang on to'em...if the motor is gone ill just end up buying a new b16a...they arent that expensive. and then do everything right this next time.

 

yea dude a short block should run you about 900

 

keep in mind that the head is going to need some attention

 

oh yea...my type r valve springs and retainers are already on the way...is there anything else you guys would like to recommend i do to run those cams and rev to around 8400 safely?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by theswarm &raquo;</TD></TR><TR><TD CLASS="quote">my buddy just got some toda spec a cams put in his b16 and he didnt upgrade his valve springs.</TD></TR></TABLE>

Oh a friend huh?


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by theswarm &raquo;</TD></TR><TR><TD CLASS="quote">no sorry im gonna hang on to'em...if the motor is gone ill just end up buying a new b16a...they arent that expensive. and then do everything right this next time.</TD></TR></TABLE>

RIGHHHHT....

then the "how do you safely rev to 8400" Q.

come on... out with it... what did YOU REALLY do????

 

B16a,18C1

Toda Spec A cams
ITR LMAs
Toda Valvesprings
Cryoed stock retainers
PE timing belt
ARP head studs and rod bolts

8500-9000 operation all day.

to breathe up there, IHE and 2.5" catback.

 

hey man...i asked my friend to get on here and ask a couple of questions for me and now im on here trying to find out what i can do to remedy my situation or keep it from happening again...what does it really matter anyways?

and mikesarr_gsr....the type r valvepsrings should be ok up to 8500 right? thanks

 

theoretically.

if you miss and the revs go higher you will have NO room
and coil bind will be eminent on Spec As on ITR valvesprings.

 

yea me and my buddy pulled the head tonight....and my piston was pretty much shattered. a couple of the valves were crushed too. ill try to get pictures up tonight. i have a question though...would the distributor failing have anything to do with it too?...cuz my distributor is really hard to turn and it seems real bad and my friend thinks that mightve been the reason it messed up.

 

cuz my distributor is really hard to turn

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Bent intake camshaft?

 

sorry for being unspecific...i guess...but where the cam is connected to it (i dont know what its called) its turns real hard and theyre supposed to be real smooth arent they?