Raising Compression

[Paseo2nr]

I'm trying to think of an effective, relatively cheap way to raise the compression on my seo. I've thought about the 5efhe head, but i don't know if my top-mounted distributors would work then. any suggestions?

[toyotasera.co.uk]

easiest would be to skim your cylinder head

where is the distributor on your engine? I've got spare 5e-fhe heads.

[Paseo2nr]

my engine's distrubutorless, and how does one go about shaving the head?

[Boro Sera]

Head Skimming is a fairly standard thing that your local engine specialist can do.

If you blow the head gasket, for example, and warp the cylinder head, the head is skimmed ( shaved flat ) to repair it. Skimming a good head is the same process, it just makes the head a fraction shallower, reducing the volume of the compression cylinder and hence increasing the compression.

[Paseo2nr]

nice. any idea on the horsepower gains?

[ms-glanza-cyprus]

im running .4 on my wife's glanza , all it has is a skimmed head , an air filter and a wimpy exaust and it beats standard glanzas with fat exausts , good filters and they run .6 , believe it or not. You will see the difference.

You can always change the pistons for high compression pistons.

[riko666]

could also go for thinner head gaskets (but make sure theyre stronger), and like mario said, new pistons (primarily domed ones)

[VTRick]

cheapest way is to shange the gasket for a .6mm one, the stock ones are 1mm i believe.

then skimming the head is next in line.

then pistons.

ms-glanza-cyprus:

skimming the head on a turbo car isnt really recommended though, if your missus starts to raise the boost you could have some nasty problems with pinking.