Focus Fanatics Forum banner

1 - 20 of 36 Posts

·
C2H5OH
Joined
·
11,867 Posts
Discussion Starter · #1 ·
First off some pics of the head:

Intake side



Chamber side



Exhaust side





This is where I started. Not even close to done but I smoked my Dremel, litterally.
I really didn't want to go as big as I am right now. Stock vertical centerline was ~35mm; now I am at ~45mm. Stock horizontal centerline was ~40mm; now I'm at ~46mm. That is a hell of a volume gain and normally would slow the exhaust flow quite a bit. But I should be able to keep exhaust velocity up because I am going to polish the ports, will look chrome when done. What that will do is retain heat and we all know that when you heat air it expands.

Any way I'm way off my month plan, waiting on a spring compressor still, tomorrow hopefully.
I'll update more as I have it.

All pic's can be found here --> http://s34.photobucket.com/albums/d120/iminhell/svt head/
 

·
Shot me 3 deer!!!
Joined
·
9,247 Posts
were u using air tools?? when doing a head, I tried not to spin past 12k rpm and the dremel tool was just fine! looks good!! should be interesting to see the power gains you get!!
 

·
Registered
Joined
·
11,906 Posts
I wouldnt have changed the shape of the exhaust port, when you start to oval it out like you have done you tend to have a drop off in flow.

I wish you would have PM'd me I could have given you a few pointers on the Zetec head (that I learned from Tom)
 

·
C2H5OH
Joined
·
11,867 Posts
Discussion Starter · #4 ·
I'm trying something different, so the tried and true really might not serve me the best. then there is the part that I am going to try to fit this to the standard zetec, which far as I know has not been acomplished yet. Plus I'm the kind of guy that likes trial and error, partly because sometimes you stumble on something that works but is not in the norm (the three grooves for instance, Google it). Plan is to run some pretty high compression and E-85, both of which will add to the exhaust velocity. So I'm really not to worried about the ports looking too big, they will work out just fine.
Now if it was a turbo build then yes I would worry more and keep them smaller to keep spool time to a minimum.

BTW I'll try to get this one flowed fully before I dyno, asumming it all fits and runs.
 

·
Registered
Joined
·
11,906 Posts
Its not the size of the ports, its the shape. Ford really came through with their shape on the exhaust of the SVT head.

When I did the P&P on my head the very first thing Tom asked me was "You didnt change the shape of the exhaust port did you?" Then he went into an explanation of why its shaped like it is... and after he lost me I just started nodding every now and then.
 

·
Registered
Joined
·
881 Posts
If you wouldn't mind sharing publicly, what are DOs and DON'Ts for reshaping the Zetec and SVT exhaust head?
 

·
FocusXtreme
Joined
·
3,369 Posts
so how does this ported head compare to the 1000 dollar one from FR
 

·
C2H5OH
Joined
·
11,867 Posts
Discussion Starter · #11 ·
get a new dremal. i have 2
Well I thought I had a cheapy B&D back up. How wrong I was. It's a WFO unit, 30,000rpm with no adjustment [bawling] . So I went to Menerds and got a crappy Tool Shop brand for the next few days ($20). Sent the good one off the Dremel to get fixed (~$42 max it will cost me [thumb] ).


Badass3,
Not sure yet. What you see is as far as I got last night, damn tool failures, lol. Like I said though, once i get to a point I think I like I'll look into getting it flowed and post results after, dyno there after.
 

·
FF Affiliate
Joined
·
31,162 Posts
Polishing the ports to past a mirror finish or keeping them to a semi-rough finish wont change the velocity its size and shape that changes the air speed

If you dont have a flow bench and about 3 heads to play with then all your doing is making your self feel better by doing it your self and 98% of the time you loose flow and velocity , then after you get done on the flow bench and install the head and find just because you have killer flow numbers it didnt make any more power (massive take note) you go back and start over again

Here is where 85% of the wanabees (massive) mess up then get ported heads and flaunt there flow numbers and thats all well and good then you install an intake that cannot maintain those flow numbers or velocity or the shape wont work with the shape of the intake or header and you pissed away good money for nothing

Then you have shops making intakes (HTP / CFM take note) that out flow what the head can flow or cant flow enough because the intake wasent made to work with the head but just made to sell

It takes a combination of things working togather , Its why I spent years on my flow bench and dyno both in house and why my stuff allways worked so well , If an intake would make better power I would of made one , if it was worth doing a head more then the Ford Racing head I would still offer one , if there was a turbo cam that worked I would offer one but the dont

Tom
 

·
C2H5OH
Joined
·
11,867 Posts
Discussion Starter · #13 ·
Got a little further today and yesterday.


I "deshrouded" the intake valves a bit. Not too sure if it really qualifies, but it makes me feel better.




Also polished out the exhaust ports a bit. I'm not quite happy with it yet, a few gouges I want to smooth out. But you get the idea.





 

·
Registered
Joined
·
122 Posts
I just killed my Dremel while porting my throttle body. It has been messing up for a while, but it sucks none the less.
 

·
Sooooooooooo EURO
Joined
·
14,708 Posts
Polishing the ports to past a mirror finish or keeping them to a semi-rough finish wont change the velocity its size and shape that changes the air speed

If you dont have a flow bench and about 3 heads to play with then all your doing is making your self feel better by doing it your self and 98% of the time you loose flow and velocity , then after you get done on the flow bench and install the head and find just because you have killer flow numbers it didnt make any more power (massive take note) you go back and start over again

Here is where 85% of the wanabees (massive) mess up then get ported heads and flaunt there flow numbers and thats all well and good then you install an intake that cannot maintain those flow numbers or velocity or the shape wont work with the shape of the intake or header and you pissed away good money for nothing

Then you have shops making intakes (HTP / CFM take note) that out flow what the head can flow or cant flow enough because the intake wasent made to work with the head but just made to sell

It takes a combination of things working togather , Its why I spent years on my flow bench and dyno both in house and why my stuff allways worked so well , If an intake would make better power I would of made one , if it was worth doing a head more then the Ford Racing head I would still offer one , if there was a turbo cam that worked I would offer one but the dont

Tom
so tom your basically saying a bone stock FR head is the best way to go for maximum performance? no additional porting or polishing will make it perform any better? (i'd be looking at this for a turbo application)
 

·
The Godfather
Joined
·
4,405 Posts
so tom your basically saying a bone stock FR head is the best way to go for maximum performance? no additional porting or polishing will make it perform any better? (i'd be looking at this for a turbo application)
You can tweak the FR head here and there but the real power will come from what cams, etc you add to the head.
 

·
Sooooooooooo EURO
Joined
·
14,708 Posts
sooooooooo what if i'm gonna run stock cams and stock head height with forged rods and pistons for a turbo application? is the fr head worth it?
 
1 - 20 of 36 Posts
Top