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21-11-2006, 09:32 PM | #1 | ||
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I have to ask this question to all in internet land.Has anyone got a real measureable real life improvement from cylinder head porting? I know that windsor heads with a port can get terrific gains but when it comes to these sixes it seems that the best in the business are yet to provide a real measure of increase.
Has anyone got any real life gains?
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21-11-2006, 10:03 PM | #2 | ||
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In my opinion they dont need much work, just a tidy up on the short turn radious's and remove all casting marks and can benifit from cutting down the intake guide and shaping them into a point so it cuts and splits the air rather then hitting a round area. Thats all we do at work but if **** factor is what is wanted then we will do mega port but it does nothing, unless the flow is needed. Ill ask you this how many people get heads ported and then do nothing to the intake manifold? or make sure things align properly.
There is no point getting a head ported so it will flow 450hp when they struggle to make 300hp.
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21-11-2006, 10:26 PM | #3 | ||
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Yes but these heads die at around 470 lift so putting a bigger lift cam than this is well..useless.
What sort of gains have you seem in real life though?
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22-11-2006, 01:23 AM | #4 | ||
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for headwork to work effectively you need to match it with an appropiate cam.
We matched my camshaft with a reasonable head port, port match and increased compression. It showed good improvements over the stock condition, the combination of improvements painted the big picture thou.
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22-11-2006, 08:23 AM | #5 | |||
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22-11-2006, 04:52 PM | #6 | |||
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. While I have my own theories on porting I have read these from engineering books which I am skeptical about.So my thoughts dont really count unless I put down the numbers at the track. Well see these results next june /July.
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22-11-2006, 05:51 PM | #7 | ||
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22-11-2006, 06:33 PM | #8 | ||
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Jim mock please go and see a real machinist, Have you seen a job from say Flow Craft? Give him a ring and tell him to stop all his guide pointing on his 10 sec engines.
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22-11-2006, 06:43 PM | #9 | ||
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Jim Mock Motorsports LMAO... ahh Gianz, heres an idea, you go see JMM and get your free kw's and let the rest of us go to reputable workshops and get some real work done
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22-11-2006, 06:44 PM | #10 | |||
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22-11-2006, 06:45 PM | #11 | ||
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mate as you know with mine i picked up about 25nm of torque and lost a couple of kw.
i think with your edit and a good tuner you will get some good results.with mine i think its to much for the ecu to handle ,mine flowed 368 @500 thou.its like putting in a bigger cam you loose a lot of vacume @ idle and the ecu dosen't like this.it throws heaps of fuel in and generaly has a spaz.to get it idle half decent and behave itself i had to have the cam advanced 5 degrees .but with your edit they should be able to tune this out. i do believe there are good gains to be had with a cam matched to the headwork and a decent tuner. while we are on the subject has anyone had a bbm manifold flow tested yet?maybe these are a restriction also to what a ported head can do |
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22-11-2006, 06:47 PM | #12 | |||
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22-11-2006, 06:51 PM | #13 | ||
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FS5, the BBM's on these engines make well over 300rwkw in a forced fed application, I dont see how they can be a restriction n/a. I could be wrong, but I just dont see them being a restriction.
I think the restriction is lack of compression, head and a small cam.. |
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22-11-2006, 06:55 PM | #14 | |||
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22-11-2006, 07:03 PM | #15 | ||
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Guys please dont fight or poke fun at particular people or businesess.Its not good. Hot xr6 thanks mate. This is what I am chasing..some real verifiable statistics from head porting. I have information in front of me which expalains head porting on a few heads .An example is a 2 litre sohc pinto engine. They show a 25% increase in horsepower at the wheels. A kent crossflow head..up to 30% increase.
If these results are true then why the heck am I yet to see on this forum one person who has done the head up and gained substantial better 1/4 mile times or substantial increase in power on independant dynos ? Without having a dig at anyone why hasnt anyone done it? Including the e series owners? The ba's are achieving 168rwkws na on the same dyno I get 131? Same capacity but more power.Sure they have a dohc but it does show what real potential that these sohc motors have.
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22-11-2006, 07:16 PM | #16 | |||
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Shaun.
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22-11-2006, 07:29 PM | #17 | ||
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all im saying is that jmm has definately done his homework to an extent and has, in some cases the figures to prove it. If anyone knows a ford performance shop that has spent as much r&d time as jmm and also has ported heads to suit our i6's please let us know before i get one. i spent many years as a race tunner working on moto gp bikes and i can sure tell the difference between good and bad port jobs. in many cases extensive porting radically changes the characteristics of an engine, especially in power delivery, when what we all want is smooooth clean power, so often as mentioned its just a matter of cleaning up what the original castings have left behind.
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22-11-2006, 08:47 PM | #18 | ||
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Ok so whos got the results on this forum from head porting? 2 cases that I have heard of proffessionally done made no real difference on the dyno or the track.
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22-11-2006, 08:56 PM | #19 | |||
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Thanks in advance.
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22-11-2006, 09:01 PM | #20 | |||
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22-11-2006, 10:18 PM | #21 | ||
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i dont think huge gains are possible na, because the variable intake runners and long bendy air intake and variable runners, take the edge off extra efficiancey of head work,etc, too many angles slow down air speed, ........would love too see individual throttle bodies velocity stacks, big cam and after market ecu or flash tuned if possible, no proof just my theory
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22-11-2006, 10:36 PM | #22 | ||
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when i was talking to jmm about there heads he told me i would gain around 10rwk for the streetfighter and 14rwk for race spec .
i decided to get mine professionaly done by headsense ,along with the 3 angle valve cut.like i said i lost a couple of kw,but in all fairness the head i pulled off our series 2 was different to the series 1 i had ported. i've been talking to some speed way guys and they seem to think you can go to big with your porting (going to big on the exhaust side)and kill performance .from what i understand airspeed was more important than the flow rate???? |
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23-11-2006, 07:34 AM | #23 | |||
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23-11-2006, 09:15 AM | #24 | |||
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I also believe the head cam flow and packages they developed around the E series didn't work as well on the small port AU heads like the AUII heads we have. I regret not getting Brenden to port my head as it would have cost no more money only time and the falcon six experience is worth paying for in headwork. This said I doubt there is much more than 5rwkw gain in an AUII head. |
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23-11-2006, 09:17 AM | #25 | |||
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I've got a series II VCT Engine. Currently fitted with: Complete HMS exhaust system. large tickford air intake snorkle with pod filter in air box followed by a 3 inch intake. autolite spark plugs + spiral leads (made a noticable difference) unichip ecu (soon to be changed) Current power output is 135 kW @ rears (somehow lost power after unichip??) So what do i want to accomplish. cc and polish every chamber and bump up compression via jmm multi layer head gasket. Port and polish where needed, only to remove casting imperfections and insert stainless steel valves. Camshaft would be good but i have not heard of anything amazing for the vct engine. Aim is to hopefully reach the 180+ rw kW of good smooth power. So basically i want what everyone else wants.....MO POWER! without taking away the awesome characteristics and sounds of a VCT i6. :hihi: any suggestions? |
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23-11-2006, 09:18 AM | #26 | |||
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23-11-2006, 11:17 AM | #27 | |||
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Hmmm, started doing a bit of research on engine theory and i think that the engine internals need to be balanced with the head work. Here's a section of text from wikicars thats a simple explanation of this.
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23-11-2006, 01:43 PM | #28 | ||
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Knowing all this, we should be very greatful that there are people out there making some attempt to find whats the best combination of porting / headwork, cams ect for these so called "tractor engines". The real question is...who has worked it out with real figures to prove it? and of course who is the best man for the job?
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23-11-2006, 05:43 PM | #29 | |||
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23-11-2006, 08:11 PM | #30 | ||
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From what I have heard from a few places ... Trick and Mansweto crate engines in ... and that's it ... no R&D over here. All they do is get an engine from US normally and bolt it in .... that's all.
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