this is wot happens at 100mph in 4th combined with single valve springs!!




b4 anyone slates me sayin i should have known better with the springs the prev owner lied an said they were done, should av checked i kno

 

y are the pics small?

 

Erm... standard rst's (even 3i's) will run over 100 in 4th without doing that?

 

well obviously not, evidence is clear, old weak valve springs an a PE cam

 

You do not need double valve springs to do 100 in 4th on a cvh
Yours must have been seriously weakened to do that. When you say evidence is clear, how so? Was it definitly valve bounce or is it possible the valve head has dropped off?

edit: not trying to argue, just clarify

 

i would say bounce but its not impossible for the head to av dropped off, but ass the stem was slightly bent i imagine the head must av come into contact with the piston while still attached to the stem although its poss it could have made contact with it from travellin on the piston, i knew nothin of the engine b4 i got it could av been original springs 4 all i kno, the bloke i got it off also said it had a full arp kit on it which was also bollox

 

shit happens lol just made me bring my 1800 cvh plans a bit further forward lol

 

i dont think a spring casued that, more like it ran lean and got hot to make the valve snap

 

hmm tending to agree with xr4x4rs, 4th gear high load for a long time, if lean the zorst valve will get fucking fucking hot.

 

Ops not to worry.I hope its back up and running soon.

 

not good to see, feel for you mate

 

ah well lol

 

so wot explains bent stem with no impact marks?
not a prob anyway ill have the new engine in soon 2 maybe 3 weeks, good excuse for more power without the missus moanin, all she knows is im fixin it lol

 

bad day then mate

 

deffo looks lean on that pot, but it is a small pic lol

 

tbh as soon as i see the oil cap had blown off i knew it was pretty terminal lol an if i wasnt so impressed with the damage i would av cried instead of laugh lol, there were bits of piston in unimaginable places, even a bit forced up the side of a lifter, the turbo blades were covered in molten alloy an every pot was scored
u live an learn tho lol

 

you mean the bent stem of the valve, after the cylinder got lean so ran super hot after detting and theheat found a weak point in the valve head for it to fall off and smahs you pistons up

id imagine the bent stem wasbecuase of whats left of the vale head being thrown around in the chamber and your engine revving still at high rpm lol

but it is shit when it happens as its happened twice on me on my old rs turbos

when you get a new engine go efi

 

, dunno how to resize my image lol.
It is a possibility i was just assumin valve bounce tbh with the bent stem an all that but thinkin bout it we put my spare engine in an it over fuelled massivly which was meterin unit so i ripped the whole thing apart to start again

 

make sure you clean all the shit out of the inlet manifold etc!fecking hate rebuilding engines whenc they have smashed to fuck like that

 

all i was sayin is the remainder of the stem was slightly bent but had no impact marks on it, not that im doubtin your word mate im all for learnin new things

 

yh done all that, replaced pretty much everythin else car ancillaries as didnt wanna chance a single but goin in my new engine

 

100 in 4th shouldnt be a problem really on a well set up car as mine regularly see's that gutted for ya tho

 

i dont kno it was well set up mate but always ran fine an plugs were always a nice tan colour pistons look a good colour too, plan was for bigger power over winter anyway lol

 

Thats run lean mate....

My old RST used to do sustained off the clock runs at 5500rpm upwards on the standard original 1989 engine and internals...

 

so i keep gettin told mate, like i said i only assumed drawing a conclusion on wot i found but v poss i was wrong, also poss i was right tho, i took it up to an beyond that many times an for longer periods tbh lean didnt cross my mind due to the healty colour of the rest of the pistons an valves, surely if it was runnin lean it would be lean on all cylinders

 

unlucky lol
hope its sorted soon