Is it supposed to look like this

[Graham]

and this





no wonder i was a tad down on power at thruxton

G

[rev-erend]

Urm.. no.

Has the rocker shaft snapper too...

[Graham]

rocker shaft snapped
pushrod bent

valve into piston

lifter jammed hard into the block...

basically fecked...... looks like the block has twisted...

[rev-erend]

Ouch - sounds expensive.

Was it the std engine - or did it have a crazy cam
(hydraulic - I'd say from the picture).

Was it an old engine (high miles) or just being
soundly thrashed.

[Graham]

tasmin challenge spec 2.8i motor with wildish cam & normal solid lifters.

only on its 4th outing since rebuild so say 300 miles old !!!!

might explain why it would only pull 5.5k rpm on the back straight at thruxton and everyone else was hard up against the rev limiter and 20mph faster!!!!


ho hum, next outing is the birkett on saturday, so im having to borrow another engine...

Oh yes and the diff we only put in last week has done a bearing, so i've had to borrow a diff as well!!!!

[TaSmania]

Oops - sorry to hear your woes - good luck.
GB

[jeff m]

That happens on an iterference engine when the timing belt breaks.
This engines doesn't have a timing belt or chain, it's gear driven. I'd be interested to know what caused it, if or when you pull it apart.
Jeff

[kevinday]

Time to go back to the engine builder and ask for an explanation methinks.

[Graham]

bascially the lifter has jammed its self at the top of its stroke, and the valve open. the piston has whacked the valve which has bent the pushrod and then snapped the rocker shaft....

the lifter is so tight you carnt even hammer it down !!!

[jeff m]

Graham
Are other people running the same cam as you.

Jeff

[Graham]

yep,

although the same thing happened on a different lifter with a different cam when in france, so i think it a problem with the block twisting...