Combustion chamber porting? Worth or not?

goodsy1968 · Post by **goodsy1968** » Thu Jan 18, 2007 5:16 pm

where?

ihatesissycars · Post by **ihatesissycars** » Thu Jan 18, 2007 5:18 pm

I think he means how much can be skimmed from the head faces.

Post by **katanaman** » Thu Jan 18, 2007 5:29 pm

Yes how thick is the face of the heads.

scoobyv8 · Post by **scoobyv8** » Thu Jan 18, 2007 10:18 pm

i have a few spare heads if you have a hacksaw

goodsy1968 · Post by **goodsy1968** » Thu Jan 18, 2007 11:36 pm

you could skim 100 thou, but never needed to as the chambers would be a bit small. usually anything up to 40-50 is all ive ever needed. Rule of thumb is 006 thou to 1cc.

Post by **katanaman** » Thu Jan 18, 2007 11:44 pm

scoobyv8 wrote:i have a few spare heads if you have a hacksaw

I got spare heads too but am not using a hacksaw lol. Now if I had a band saw

Post by **Coops** » Thu Jan 18, 2007 11:54 pm

katanaman wrote:
scoobyv8 wrote:i have a few spare heads if you have a hacksaw
I got spare heads too but am not using a hacksaw lol. Now if I had a band saw

@marki

Wotland · Post by **Wotland** » Sun Jan 21, 2007 11:17 am

An very good book about how to modify head and reshaping combustion chamber :

Now pretty rare and expensive.

HairbearTE · Post by **HairbearTE** » Thu Jan 25, 2007 7:00 pm

Three other good books on this subject are:

1) How to build, modify and powertune cylinder heads by Peter Burgess.

This is a more recent book than some on the subject and includes useful guide to building your own flowbench too.

2) Practical Gas Flow by John Dalton.

An older book but very useful. The current edition is updated a little.

3) Four-Stroke Performance Tuning by A. Graham Bell.

A hardback published by Haynes that covers a range of relevant topics including useful tips on exhaust too.

The book mentioned above by Wotland is indeed a good read and anyone wishing to find more on the subject from Mr Vizard can try to source a series he wrote in PPC mag a little while ago, back issues may be available. He also writes regular in depth articles in Popular Hotrodding, which is one of the better yank mags. There are various books available that cover fluid/gas dynamics/mechanics as subjects in their own right, rather than just within in the engine environment but these books are usually Uni student material and while you might gain a little from them you will very soon realise if your maths is not up to it. (Mine wasnt!

)

If anyone wants a good copy of Practical Gas Flow send me a pm as i have a spare.