20 replies to this topic

[Cooperman]

Use a 2.7 cc volume for a 998 gasket. For a 1275 use 4 cc.

If opening up a 998 head (not a 12G940) be very careful you don't cut into a waterway. It's easy to do (been there, done that) and then you need a new head.

Why not PM 'TurboPhil' as he is the expert on all things cylinder head.

[BaronVonchesto]

Use a 2.7 cc volume for a 998 gasket. For a 1275 use 4 cc.

If opening up a 998 head (not a 12G940) be very careful you don't cut into a waterway. It's easy to do (been there, done that) and then you need a new head.

Why not PM 'TurboPhil' as he is the expert on all things cylinder head.

 

thanks for the suggestion! I'll do just that

[BaronVonchesto]

Use a 2.7 cc volume for a 998 gasket. For a 1275 use 4 cc.

If opening up a 998 head (not a 12G940) be very careful you don't cut into a waterway. It's easy to do (been there, done that) and then you need a new head.

Why not PM 'TurboPhil' as he is the expert on all things cylinder head.

 

I really appreciate you pointing out the water channels. Going to have to carefully measure that as it seems it runs under the head gasket hole for the chamber... scary!!
I'm going to stay WELL clear of the water channels.

 

Thanks Cooperman. You probably saved my head

[Turbo Phil]

It’s definitely worth investing in David Vizards book, there are clear diagrams with measurements showing where to cut away the chamber walls. You can pick the book up for about £20 on eBay etc
If your machine shop aren’t confident in doing this kind of thing and are relying on you to supply the know how, maybe consider using someone who knows this kind of work first hand?
Most generic machine shops are fine for skimming and boring etc, but when it comes to stuff like this they usually don’t have a clue.

Phil.

[BaronVonchesto]

It’s definitely worth investing in David Vizards book, there are clear diagrams with measurements showing where to cut away the chamber walls. You can pick the book up for about £20 on eBay etc
If your machine shop aren’t confident in doing this kind of thing and are relying on you to supply the know how, maybe consider using someone who knows this kind of work first hand?
Most generic machine shops are fine for skimming and boring etc, but when it comes to stuff like this they usually don’t have a clue.

Phil.

 

the guy i give my engine parts to is familiar with the mini though he's done any performance improvement modifications for the mini specifically. In fact I'm not sure theres anyone in Malaysia that does it.

 

He's aware of the water channels and pointed it out when i showed him the templates and told him I wanted to increase the chambers by 1.6cc which is a good sign.

 

Anyway i'm not looking to squeeze the maximum possible bhp out of the engine.

 

Is there much difference between the first edition blue book and the later yellow (3rd edition) version of the book?

[Turbo Phil]

Both editions have the diagrams/info you require.

Phil.