cam belt?

dibs · Post by **dibs** » Mon Apr 21, 2008 5:13 pm

hi guys
If a cam belt breaks or a tentioner lets go will a valve hit a piston . Or is there clerance for this not to happen. Thats on this vortex im trying to get 1800 turbo
ta dibs

INEEDABEER · Post by **INEEDABEER** » Mon Apr 21, 2008 5:25 pm

I think EA2's are safe.EJ's definitely are not.

CPOCSM · Post by **CPOCSM** » Mon Apr 21, 2008 7:02 pm

The EA's are definitely safe. I seized a tensioner on mine and the belt broke - lots of swearing and a towtruck!!! Engine lived to fight another day.

Hooroo

Battlewagon · Post by **Battlewagon** » Mon Apr 21, 2008 7:20 pm

Snapped an idler pulley bolt on my EA82 and the engine lived, but I fitted new belts anyways. Just in case they were damaged.

Matatak · Post by **Matatak** » Mon Apr 21, 2008 7:27 pm

EA82 are definetely safe yes.

BUT the EA82T's ive always been told are not

Gannon · Post by **Gannon** » Mon Apr 21, 2008 7:38 pm

All EA82's are interference free, EA82T's have a bigger dish in the piston so definitely no problem there.

Some early EJ's with the SOHC heads were non interference too, apparently

SUBYDAZZ · Post by **SUBYDAZZ** » Sat Apr 26, 2008 7:40 am

EJ22 is non-interference.

Redroo · Post by **Redroo** » Sat Apr 26, 2008 1:54 pm

Sorry, minor hijack
Would flat top pistons affect the clearance on the EA82?
Mark

CPOCSM · Post by **CPOCSM** » Sat Apr 26, 2008 2:11 pm

nope...if you are still squeamish...put some plasticine on the crowns and check yourself...peace of mind

Hooroo

littlewhiteute · Post by **littlewhiteute** » Sat Apr 26, 2008 5:58 pm

CPOCSM wrote:nope...if you are still squeamish...put some plasticine on the crowns and check yourself...peace of mind

Hooroo

You should use light valve springs (SU carb springs or similar) in a mockup build to check for valve to piston clearance,
and a dial indicator will show how much additional valve lift as piston nears TDC.
Allow for compressed head gasket thickness.

Gannon · Post by **Gannon** » Sat Apr 26, 2008 7:23 pm

Why are you worried?

Even engines with valves that interfere with the piston run ok as long as the cam timing is right.

Because of the EA82's deep and narrow 'bathtub' combustion chamber, i doubt any valve will ever hit any piston as the piston is only as high as the deck of the block at TDC