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Possible head porting docco coming soon 

 

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 Post subject: Possible head porting docco coming soon
Posted: Tue Jan 05, 2010 9:54 pm 
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Looking at various cylinder head porting threads in the 6 cylinder section there isn't much in depth info so I thought of doing a cylinder head porting guide as a specialist thread or tech docco.

What I have in my a*** so far is a CMS stage 2 ported head (EF94AB) and a stock (but cracked) identical head that has been chopped up, giving me a clear cross sectional view of both inlet and exhaust ports.
What I was hoping to do was to upload the cross sectional pics in an attempt of building up a knowledge base for falcon heads, including standard specs, flow figures for workshop supplied heads (CMS, JMM and the rest, don't worry guys I'll ensure that the secrets you have put into your heads remain secrets, only flow figures will be published), and porting tips for both NA and Forced induction applications as well as tips on achieving flow quality (swirl, atomisation, etc.) as well as quantity.
Eventually I would like this expanded to cover all models of Falcon OHC 6 cyl head as there are some differences between models.

Now this is a mammoth task and one that I would not be able to complete all by myself. So this is where you guys come into it. Are there any head porters out there who would like to contribute to this knowledge base, whether by simple tips here and there or, by complete articles documenting what you are willing to disclose?

So is this something that you guys want?
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 Post subject: Re: Possible head porting docco coming soon
Posted: Tue Jan 05, 2010 10:31 pm 
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xcabbi wrote:
So is this something that you guys want?

YES, YES, YES!!!!! :mrgreen:

Im very interested in this xcabbi and i reckon there will be a lot of others out there too so i can see this becoming very popular amongst the many DIY'ers on here. Lol my eyes lit up when you said you had a cross sectional view of the cylinder head. Im currently doing a bit of DIY porting on my spare head (91AA - pretty similar to the 94AB) and would love to know how much i have to work with on the short side turn/radius on the exhaust side..

xcabbi wrote:
Now this is a mammoth task and one that I would not be able to complete all by myself. So this is where you guys come into it. Are there any head porters out there who would like to contribute to this knowledge base, whether by simple tips here and there or, by complete articles documenting what you are willing to disclose?

Im by no means anywhere near a professional when it comes to porting heads but im willing to share my tips and advice from what i've done :wink:

 

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 Post subject: Re: Possible head porting docco coming soon
Posted: Tue Jan 05, 2010 10:41 pm 
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i know not thing one about it, but will plan to send a head off in 12months or so for a job.

Would be interested in helpping with the write up or just lending a hand in general

 

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 Post subject: Re: Possible head porting docco coming soon
Posted: Tue Jan 05, 2010 10:53 pm 
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I the sound of this thread. maybe include some high velocity head porting in there as well to see if it's feasible on the mighty i6. I'll like to try it on a BA/BF head if anyone has one laying around the yard somewhere.

 

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 Post subject: Re: Possible head porting docco coming soon
Posted: Wed Jan 06, 2010 12:00 am 
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High velocity as in sand blasting? IIRC the short side will remain untouched as the medium cant make the turn in time.
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 Post subject: Re: Possible head porting docco coming soon
Posted: Wed Jan 06, 2010 7:51 am 
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nah, what I mean by high velocity porting is actually building up the port floor, short turn radius and back wall of the bowl area. basically reducing the throat area by 15-30% to that of the valves, creating a choke point which in turn produce higher air velocity. the idea has been used by motor bike enthusiast for many years and you'll probably & likely to find it's the worse flowing ported head on the flow bench. then again, flow benches doesn't mimic what's actually happening during the 4 cycle phases of our humble internal combustion engines.

Out of curiosity I'll like to see what type of results you can get from the i6/barra heads. :)



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 Post subject: Re: Possible head porting docco coming soon
Posted: Wed Jan 06, 2010 8:49 am 
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Slick wrote:
nah, what I mean by high velocity porting is actually building up the port floor, short turn radius and back wall of the bowl area. basically reducing the throat area by 15-30% to that of the valves, creating a choke point which in turn produce higher air velocity. the idea has been used by motor bike enthusiast for many years and you'll probably & likely to find it's the worse flowing ported head on the flow bench. then again, flow benches doesn't mimic what's actually happening during the 4 cycle phases of our humble internal combustion engines.

Out of curiosity I'll like to see what type of results you can get from the i6/barra heads. :)



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I don't think there would be any gains on the 2 valve heads. the short turn is to tight and they already suffer from separation on the short side. unless you were trying to build a good towing engine that will not want to rev past 4000rpm

 

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 Post subject: Re: Possible head porting docco coming soon
Posted: Wed Jan 06, 2010 9:04 am 
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it would be well worth doing a doco, don't think there wouldnt be to many people that wouldnt wanna know how to port or try to
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 Post subject: Re: Possible head porting docco coming soon
Posted: Wed Jan 06, 2010 7:30 pm 
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Troy wrote:
it would be well worth doing a doco, don't think there wouldnt be to many people that wouldnt wanna know how to port or try to

There's a lot of things to try. And with the amount of info on building flow benches for the fraction of the cost of the base model superflow, I'd be mad not to give it a red hot go.
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 Post subject: Re: Possible head porting docco coming soon
Posted: Wed Jan 06, 2010 9:55 pm 
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i've just picked up a 'rebuilder' AU VCT engine. the head isn't complete as it's missing the cam timing actuator, i never got it for the head anyway. I'm happy to lop off the back of it and send it to you.
Complete with valves, springs, retainers. You should be able to get flow figures and and do a step by step port job with flow tests along the way.

 

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 Post subject: Re: Possible head porting docco coming soon
Posted: Thu Jan 07, 2010 7:49 am 
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tickford_6 wrote:

I don't think there would be any gains on the 2 valve heads. the short turn is to tight and they already suffer from separation on the short side. unless you were trying to build a good towing engine that will not want to rev past 4000rpm


There's always away around the tight turn. tickford, have you got a cracked 2 valve i6 head you can cut up in cross section? Just wanna see how thick the port walls are before you grind your way into the water jacket. :lol:

 

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 Post subject: Re: Possible head porting docco coming soon
Posted: Thu Jan 07, 2010 9:55 am 
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Slick wrote:
tickford_6 wrote:

I don't think there would be any gains on the 2 valve heads. the short turn is to tight and they already suffer from separation on the short side. unless you were trying to build a good towing engine that will not want to rev past 4000rpm


There's always away around the tight turn. tickford, have you got a cracked 2 valve i6 head you can cut up in cross section? Just wanna see how thick the port walls are before you grind your way into the water jacket. :lol:



I do have a head here i'm going to cut up. But don't insinuate i'm the type of person who think hogging out a port to the max is the way to go.

the port has an almost 90degree turn on the back of valve, the only way around it would be down-drought the port in the same way it use to be done to the old 1500 non crosslow ford 4cyl engines. simply grinding the crap out of the port floor would leave you with a usless shape and huge cross sectional area changes.

As the intake valve is too small to make any more power then roughly 190rwkw (that even the highest hp N/A engines are struggling to make on pump fuel) time and money would be better spent trying to get a bigger valve and finding a port shape that goes with it.

By all means if you are after a low reving torquey engine, choke the port all you like.

 

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 Post subject: Re: Possible head porting docco coming soon
Posted: Thu Jan 07, 2010 2:19 pm 
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The water jacket is under the floor on the intake side and above the roof on the exhaust. I'll upload my c sections later on today.
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 Post subject: Re: Possible head porting docco coming soon
Posted: Thu Jan 07, 2010 2:25 pm 
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xcabbi wrote:
The water jacket is under the floor on the intake side and above the roof on the exhaust. I'll upload my c sections later on today.


Are you interested in the piece of CVT head?

 

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 Post subject: Re: Possible head porting docco coming soon
Posted: Thu Jan 07, 2010 2:34 pm 
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Which part of the head. The part with all of the ports or the part with the cut out for the VCT phaser? Lol
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