what happens when your ls1 drops a valve spring

[BigMuz]

why didnt the bits of valve make it back into the inlet manifold and dispurse themselves around the rest of the combustion chambers?

I'd guess it broke the rocker or bent the pushrod and then the inlet valve stayed closed- otherwise you'd have bits of shit wedged under that valve too.

[10sec rx7]

big muz is on the money, pushrod came out with 2 45deg bends in it

[gmh8]

^^^

what cam are you now suggesting? there are a heap of people on the SC forum suggesting using that cam.

doesnt seem like they have had any problems ( they are also suggesting the same valve springs too)

is this the first time this has happened ? ( IE: that config on an LS1)

[10sec rx7]

its not the first one that has broken a 918, i know of 4 others that have broken in the last few months,

we will still be using the same cam but different springs

[floody]

I did much the same thing with my old RB20DET, although it only took a chunk of cylinder wall and a chunk of piston with it, both of which went out the exhaust as far as I know (the gate must have been open as there were no signs of it going through the comp wheel, in the head or crown, or in the sump). It still drove, though a bit rough on 5 cylinders, and didn't even blow any oil smoke. No compression on number six though.

[Hqcoupe350]

Ive also heard the latest batch of 918s arent made from the same materials anymore, and are suspect. Apparently PSI springs are the way to go now.

[Billzilla]

big muz is on the money, pushrod came out with 2 45deg bends in it

*bites toungue ....*

[BigMuz]

It's designed to fail so you don't lose the whole engine when you drop a valve bill :D

[Jay_G]

It's designed to fail so you don't lose the whole engine when you drop a valve bill :D

Because obviously thats what happened

[Billzilla]

It's designed to fail so you don't lose the whole engine when you drop a valve bill :D

Uh-huh ...

[Rollin]

So unlucky

I've had shitloads of the factory 300kW cars with broken valvesprings, usually they drive in with a missfire, we replace the spring (generally warranty won't pay for a full set but will pay for a motor if it goes bang...go figure) and off they go until the next one breaks.

In my experience they are amazingly hard to kill - I had a 300kW Coupe in a while back that had a big TB, exhaust, Mafless etc and a missfire, but the exhaust still sounded tough. (even with the broken spring)

So the fuckhead service advisor thought he would do a lap of the block at 11tybillion rpm to see how it went, then parked it in the workshop.

The workshop manager heard the car and came over for a stickybeak, before starting it and free-revving the jeesus out of it "to hear how it sounded".

I stood there with my jaw on the floor in disbelief, hoping the motor would let go just to see the look on the cockheads face while he tried to explain to the customer and the boss why a very expensive motor was now in pieces.

By some miracle it didn't drop a valve, I pulled the spring out in 4 pieces and we managed to get a full set for the customer under warranty.

This was another 300 car that wore a lobe off the cam, and pumped bits of hardened steel around with the oil until all the bores were cactus



Generally they (the normal ones and the HSV ones) hang together pretty well though, at least within the warranty period haha.

[gmh8]

wow an ls1 is powering teh internetz!!!

[upgarage]

wow an ls1 is powering teh internetz!!!

so thats my internet is always down

[Tensop]

hospital colour coded bandaids work wonders for fixing holes in pistons

[300TT]

^^ that is gold.....