manifold porting

[grovers_vn]

who knows how to port a manifold on a s1 vn v6 ?

[soop]

me??........

[grovers_vn]

you do could it be done by a guy with a fair understanding of mercanics and way to much time on his hands ?

[soop]

sure, thats all I am. You'll need a die grinder and a few bits though.

[grovers_vn]

is there a gide i can look up ?

[soop]

Not that I've found mate, you're better off looking for books on the subject, there's bugger all on the net.

[grovers_vn]

okay thanks mate is just a matter of opeing up the chambers or is there more to it

[soop]

There's more to it.
All about where you take the material from, kinda too involved to explain here atm.

[grovers_vn]

okay well thanks for the help in try and find a book on it or somthing

[pimpmyvt]

use a thick gasket glue or whiteout if ya game around the ports on the block and bolt the head on loosly-ish the un bolt then you can see the over-lap the grind away..... im drunk tho soo probly not a good idear

[Brett_jjj]

use a thick gasket glue or whiteout if ya game around the ports on the block and bolt the head on loosly-ish the un bolt then you can see the over-lap the grind away..... im drunk tho soo probly not a good idear

This is exactly whats involved basically.I match ported my VS V6 manifold to the heads when I did my inlet manifold gaskets..I used boot polish to find the overlap,but you could use anything really as long as it doesnt dry quickly.I had overlap where the manifold joins the heads and where the plenum joins the manifold,I made these overlaps all flat and even, then sanded and polished the inside of the runners in the manifold to get better flow.

[db_notso]

match porting is beneficail to response

to match port hold gasket against area
slide bolts through head(or whatever) and through gasket
mark the part inside the gasket ( permanent marker)
remove gaskets and bolts
then grind (die) away HALF of that marked thickness (by grinding half on most heads will stop you from grinding away too much and destroying head)
then you need to smooth out up the inlet/exhasut to gentley flow into the grinded outter edge (e.g. expand the whole port from where it comes from)

then refit !~

[Brett_jjj]

match porting is beneficail to response

to match port hold gasket against area
slide bolts through head(or whatever) and through gasket
mark the part inside the gasket ( permanent marker)
remove gaskets and bolts
then grind (die) away HALF of that marked thickness (by grinding half on most heads will stop you from grinding away too much and destroying head)
then you need to smooth out up the inlet/exhasut to gentley flow into the grinded outter edge (e.g. expand the whole port from where it comes from)

then refit !~

The gasket port holes should be slightly bigger than the ports anyway,otherwise it would be blocking the ports a bit once its fitted..When I checked the new gaskets against the ports ,the gasket port holes were slightly bigger than the ports themselves,and the only overlap was between the ports themselves where they join, so I just filed it down even with a rat tale file and smoothed it with sand paper..You dont need a die grinder to do it.

[Benboy]

If you do accidently take too much metal off inside the ports, you can penetrate into the water jacket and then you will have created major problems for yourself. Remember: less is best, measure twice - cut once, it's easier to take off metal then it is to replace it, once the damage is done you will have no-one else to blame but yourself. I suggest you get or buy a secondhnad head from the wreckers and practice on that. Might save yourself a LOT of heartbreak. Good luck with it.

[soop]

I wouldn't recomend polishing the manifold runner or the ports in the head. The castings actually create a buffer zone of slow air, which essentially helps the rest "slip" over it.

[Brett_jjj]

The polishing and port matching definitely made mine run better than it used to before.It runs a hell of a lot smoother, and is more responsive at light to medium throttle than it was.The idles a lot smoother too.

[soop]

mmm, every other source of information I've ever found has warned against polishing the surfaces.

[Brett_jjj]

Dunno mate,it worked for me,definitly a noticeable difference there.Mainly to how smooth it runs.

[pimpmyvt]

Dunno mate,it worked for me,definitly a noticeable difference there.Mainly to how smooth it runs.

well i guess some one has to get 2 sets of heads and match port em polish one and try both... on that note it is wise to polish nere the opening of the port as to help stop deposits of gunk... one thing i want to see is some one grind a head and weld a pipe into it to make like a pipe into cone system soo you dont get as much turbalance (pipe into cone like the exauset systems)

[db_notso]

you should not SMOOTH the intake side of the heads they are rough to help with the swirl of air into the chamber and the atomisation of fuel particles
the exhaust side on the other hand can be glass as you just want to get rid of the gas as quickly as possible

[TI3VOM]

I wouldn't recomend polishing the manifold runner or the ports in the head. The castings actually create a buffer zone of slow air, which essentially helps the rest "slip" over it.

I have been told this by three people in the industry!!
The only thing that really needs polishing is the exhaust ports (on heads that is), as it wont let the residue build up as quickly.

[Brett_jjj]

Yeah,I had heard it all before too.But when I decided to try it anyway after matching the ports,it turned out that it ran better. Id say half the people who say these things have probably never tried it to see for themselves.

[db_notso]

i would say that i LOVE the money that comes into the shop for top end cleaner cause your intake is all gunked up but hey its your money !~

[soop]

Yeah,I had heard it all before too.But when I decided to try it anyway after matching the ports,it turned out that it ran better. Id say half the people who say these things have probably never tried it to see for themselves.

Really, so the fact that people in the industry (I.e performance head modification ect) and certified technical manuals state that as a basic rule of thumb or beginners makes it null and void because you made a faceless statement on the internet?

Woohoo...

[db_notso]

Really, so the fact that people in the industry (I.e performance head modification ect) and certified technical manuals state that as a basic rule of thumb or beginners makes it null and void because you made a faceless statement on the internet?

Woohoo...

i was trying not to be harsh man jeesus soopie christ!~