Broken inner valve springs


ijwhiteman

ijwhiteman

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Anyone else come across this? Can you share your experience.

B18c engine 53,000 miles

Why would this happen? :angry:

It is our diagnosis at the moment but seem most likely everything else is fine. :angry:
 
valve springs usually wear / break due to over revving or oil starvation
 
A small imperfection during manufactoring more than likely.
 
id strip that engine down to every nut/bolt and rebuild (examine everything in fine detail)

had this happen with rocket motorsports gen 2 spings but fair few shattered in my original b16a2, wasnt over reved and oil was fine, were in car couple years when it happended but never dug deep enough to determine cause although good chance tiny manufacture defect finally caused them to give way (wild guess)

decided by mate who is **** with builds etc to scrap engine and get another, motor had done about 80-85 i think but hassle/cost of complete dissasembly and then inspection of every component etc was not cost effective so bought another engine to start new building block

if your lucky, damage is minimal and engine salvagable i hope
 
iceman he only broke the inner spring so i think everything should be ok as long as it didn't shatter into pieces.
 
i know but tiny fragment of spring barely visisble is all it takes to put nice scoring on cylinder wall for example

ian, is this engine from you ek4 ?
 
It is the engine from my EK4, its running fine and pulling very well, we've done a compression test and all good, re checked all the valve clearances, i think it has broken in 2, its so intermittant, you can rev it and it completely goes away then as the spring rotates it comes back again later, oil is good and when hard driving occaionally does get the odd bounce on the limiter :angry: but its is shifted right away. I think it may have been previous owner as i have only done 3k miles max and i noticed a small rattle from day 1 of install, put it down to oil, then had the valve clearances checked and it obviously greatly improved as they needed doing, then the spring has noticable got worse.

A mate of mine had 2 gone in his B18C drove for 1500 miles before a strip spotted the problem.

We're going to strip the head to confirm this, if it is we will replace

All inner and outer springs
Retainers
Head gasket
Head bolts
Valve guides

Keep it all genuine honda. I would have thought any defect would have been solved in the 12 yrs that the engine has lived.

Only done 53,000 miles though. :nono:
 
hmmm my brothers b16b head is making a noise as well, it goes fine, when you rev is slightly it sounds like it has a small nail in the head rattling around. is yours making a similar noise ?
 
jpar196 said:
hmmm my brothers b16b head is making a noise as well, it goes fine, when you rev is slightly it sounds like it has a small nail in the head rattling around. is yours making a similar noise ?
Click to expand...

yes his is matey
 
jpar196 said:
hmmm my brothers b16b head is making a noise as well, it goes fine, when you rev is slightly it sounds like it has a small nail in the head rattling around. is yours making a similar noise ?
Click to expand...

Yes mate sounds exactly like a nail but comes and goes and can only here it when on idle.

saxophonias said:
do you have stock rev limiter?
Click to expand...


Yes it is mate
 
exactly the same, cant really hear it while driving. and while idleing I can get it to make the noise in certain rev range. if I rev it harder it seems to go away, dont know if the noise is getting covered up but it sounds like something is loose inside. might get the valve springs looked at. will let you know if I find something
 
Yeah definitly, only trouble is to be certain its a head off job... Pain in the arse.
 
Somthing to bear in mind... pouring cold oil into a red hot engine doesnt do them any good. ;)
 
EK9turbo said:
Somthing to bear in mind... pouring cold oil into a red hot engine doesnt do them any good. ;)
Click to expand...

I've done that before at the track day.... :angry: I think it had cooled a little before i did that.

The valve spring had been playing up well before that.
 
ijwhiteman said:
Yeah definitly, only trouble is to be certain its a head off job... Pain in the arse.
Click to expand...

not neccessarily, fit a compression tester attachment to your airline this way you can keep the valves up in the head as you pressurise teh cylinder,

all you need then is a valve spring compressor that bolts to teh head and you can change teh springs without taking teh head off :nice:
 
olly ek9 said:
not neccessarily, fit a compression tester attachment to your airline this way you can keep the valves up in the head as you pressurise teh cylinder,

all you need then is a valve spring compressor that bolts to teh head and you can change teh springs without taking teh head off :nice:
Click to expand...

LOL to late head is off now, thanks anyway buddy. :nice:
 
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