DIY head porting

ppyvabw · Post by **ppyvabw** » Sun Aug 10, 2008 8:52 am

I am going to save myself 500/600 quid by porting my own cylinder heads, so any information on what I can take off in the ports and the chambers would be appreciated please. Any websites or books that people know of? Found a few websites but they aren't specific to the rover.

I am going to practice on some cylinder heads first, so if anyone has some cracked or knackered heads to practice on, that would be great.

sidecar · Post by **sidecar** » Sun Aug 10, 2008 8:59 am

Des Hammills book is very good!

I had a set of heads done to stage III by V8 Dev, what you could see was very nice but at a later date I had to take the valves out, just behind the valve seats was not so good!

This is one of the main areas for improvement and it's dead easy to do!

The seats are rock hard, you need a load of tungsten burrs, Axeminster Tools sell them for about 3 quid a piece, they will fit a demel. Buy at least 6!

Pete

HairbearTE · Post by **HairbearTE** » Sun Aug 10, 2008 11:16 pm

I'll give you a couple of old heads to practice on if you can collect from london.

350matt · Post by **350matt** » Wed Aug 20, 2008 12:19 pm

Open the chambers out to the gasket line around the valves, the inlet is quite badly shrouded and you don't lose loads off the CR either

Matt

topcatcustom · Post by **topcatcustom** » Thu Aug 21, 2008 5:16 pm

There doesnt seem to be much around the inlet to port on these- is it still taking off the little edge that is there?

sidecar · Post by **sidecar** » Thu Aug 21, 2008 5:40 pm

topcatproduction wrote:
There doesnt seem to be much around the inlet to port on these- is it still taking off the little edge that is there?

I think that it's a case of every little bit helps!

The area to de-shroud would be around the 2'o clock position on the heads at the top of your picture.

Anyway, wait until you get the valves out, then you'll see the huge step where the insert blends (badly) into the track.

Pete

topcatcustom · Post by **topcatcustom** » Thu Aug 21, 2008 8:35 pm

Most of the benefit is from smoothing out the sharp corner which the mixture has to flow around before it enters the cylinder then ya? And the little bit around the valve helps the combustion...

ppyvabw · Post by **ppyvabw** » Mon Dec 01, 2008 3:45 pm

Just going to bump this thread up again if I may.

How important is a flow bench for this kind of thing. Has anyone ever bodged together their own rudimentary flow bench?

HairbearTE · Post by **HairbearTE** » Mon Dec 01, 2008 6:53 pm

Yeah I started one at the beginning of the year but after doing a bit more research I changed my plans and redesigned it. Needless to say the project has taken a back seat for the mo due to financial constraints. The 'fred is on gen chat I think. There is a lot of info out there on the subject and books detailing basic flowbench theory include "practical gas flow" (I just sold my spare copy on here) and Peter Burgess' book. A great source for equipment is http://www.flowperformance.com/

topcatcustom · Post by **topcatcustom** » Mon Dec 01, 2008 7:35 pm

I'd like to build a flow bench but those parts look expensive! Helpful site though!!!