4a question, running on 2 cyl, damaged valves???

**JoJo** · 30-12-2007, 10:12 PM

valves etc acted fine...

**oldcorollas** · 30-12-2007, 10:27 PM

i mean, how did it feel as far as resistance to turning goes, when you went past TDC for each cylinder?

any damage to piston tops? pistons 1 and 2 magically clean? or funny marks from where they are adjacent to each other?

**LeeRoy** · 30-12-2007, 10:47 PM

It will rattle as it will be detonating. I did a HG the same way - between two cylinders. It was gutless, sounded like a wrx, and had some severe knocking under load from ignition occuring through the hole in the HG.

A compression test should let you know if the HG is blown.

**feral4mr2** · 31-12-2007, 12:38 AM

Originally Posted by LeeRoy

It will rattle as it will be detonating. I did a HG the same way - between two cylinders. It was gutless, sounded like a wrx, and had some severe knocking under load from ignition occuring through the hole in the HG.

A compression test should let you know if the HG is blown.

indeed, i've suffered the same symtoms. a quick compression test showed 2 cylinders (was 2 and 3 in my case) with the same low reading. new HG and away i went!

**JoJo** · 31-12-2007, 01:18 AM

Compression test results:

CYL
1 - 60
2 - 62
3 - 158
4 - 156

The head is now coming off....

**LeeRoy** · 31-12-2007, 02:51 AM

Originally Posted by feral4mr2

indeed, i've suffered the same symtoms. a quick compression test showed 2 cylinders (was 2 and 3 in my case) with the same low reading. new HG and away i went!

Mine was 2 and 3 also.

Should also mention that the detonation got worse very quickly. It started out as a very small knock and within 2 minutes it was very loud. Luckily i was at the bottom of my street when it decided to give up the ghost.

If you didnt have a comp tester and wanted to see if it was this then removing the plugs and having a look into the cylinders should show all the bits of busted HG sitting on them. Mine had blown about a 2cm long piece out of the HG which was found in the chambers upon head removal.