Jonte

Hi,

im just rebuilding my 2.7 and got to the cylinders. They are KS and have the marking 854/2B and are supposedly alusil. The thing is that when testing with a magnet the surface seems to be magnetic.

When reading on this these KS cylinders are supposed to be alusil which shouldn't be magnetic.

Am I missing something?

90mm cylinders for 1976 2.7

Voith

Material doesn't appear alusil to me. Cast iron imo. Post picture of bore..

Jonte

It's quite puzzling to me... they're also worn a bit around the turning point. Maybe previous owner bored down and replated?

Jonte

I finally figured out that someone actually put cast iron liners into the original cylinders.

So so here goes... can I bore these out to 92mm and put a new set of JE 9.5:1 pistons in there to get my engine running again?

thought, ideas?

theiceman

I wouldn't think so with inserts. You would need to consult a machine shop I would think
Or Steve !!

Jonte

Doing the actual work is within my local machinist capability for sure.

My concern is if taking 1mm out on the radius would leave a too thin wall and that it would deform under heat.

fennlane

Confusing.

The spigot bore diameter on a Magnesium 2.7 is 97mm.

If the liner is 97mm diameter and forms the spigot it should be OK.

Jonte

Yes confusing indeed!

It it is the 97mm spigots and I'm now thinking if I should just get a set of 92mm JBs 9.5:1 and let my local machinist bore and hone to perfection.