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By CK - 11 Years Ago
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Anyone know where to get a CNC porting program?Guys have the machines here in Australia yet none have a program for this vintage engine. ????? |
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By NoShortcuts - 11 Years Ago
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I was intrigued when John Mummert went the extra distance in offering CNC porting of his new heads, CK.
It has got to take a world of effort to have worked that through. I would suspect that John or Geoff did the actual porting on a set of their aluminum heads and then used the system utilized in industry for setting-up a a robot in a work cell to do something by physically leading the robot through the steps needing to be performed. My understanding is that the computer program is 'written' by the walk-through training process performed.
That would make an interesting article for Y-Block Magazine, John...IF that is what John and Geoff did, I wish that they would develop and offer a CNC porting service for our iron 'G', 113, and 471 heads. While the aluminum heads have many advantages over the original iron heads, I have some favor of an all iron engine for my street applications. No, weight is not one of those advantages!  |
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By charliemccraney - 11 Years Ago
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I also suspect that the fact that John designed the heads takes a lot of the R&D out of the work involved to develop a cnc ported profile. I'm sure he has the 3d CAD model for the aluminum heads and may have designed the CNC ported design at about the same time. That would eliminate a lot of the work involved in getting it figured out for iron heads.
I really doubt you will find an iron head program.
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By alvin - 11 Years Ago
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The people that you know can't make programs? If their cnc machines have digitizers, they can make their own programs. We build programs often, however, I don't have the fixture for a y-block
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By CK - 11 Years Ago
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Has anyone bought aluminium heads here in Australia yet? May I ask how much it cost by the time they got to you?
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By PF Arcand - 11 Years Ago
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John Mummert has stated in the past (paraphasing) that most people familiar with our engine would think he needed his head examined for going to the lengths & expense he has, to develop the aluminum heads. Therefore, his company no longer ports cast iron heads. Developing a cnc porting program for o.e. heads, would be akin to shooting himself in the foot...
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By NoShortcuts - 11 Years Ago
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PF Arcand (6/9/2014)
John Mummert ... his company no longer ports cast iron heads. Developing a cnc porting program for o.e. heads, would be akin to shooting himself in the foot...
You are 100% correct, Paul.
I have the highest regard for John Mummert because of his plethora of contributions to our hobby interest for over 20 years. His contributions have included articles written for Y-Block Magazine, input in our Forum threads, and his offering of high quality components, accessories, service and performance parts for y-block related projects. His input in the development of superior performance components like the Blue Thunder intake and more recently his own design and production of an improved intake manifold and cylinder heads should earn him a place in the Hot Rodders' Hall of Fame in anybody's view.
Suggesting the development of a CNC porting offering for iron heads is strictly an end user thought. The original Ford cylinder heads, because of fundamental design limitations, in spite of ones porting efforts, are not capable of delivering the flow ratings, rpm ceiling, torque or horsepower figures that John's redesigned heads deliver out-of-the-box. For street and 3,000 rpm-and-below (overdrive) highway use, knowledgeably and carefully modified iron heads will yield solid performance.
After making the investment in producing aluminum cylinder heads, I completely understand John and Geoff no longer modifying iron heads for y-block use. I'm glad that the market for the aluminum heads has apparently been strong in spite of the economy that we've had for the last 5+ years. The development costs and headaches for bringing the intake manifold and heads to market had to be significant. I'm sure that there were many friends and side-liners who repeatedly questioned John Mummert's business sense in developing products for an engine something-short of 50 years out of production as he started out with the process.
Kudos to John and Geoff Mummert and the many others on this Forum who have made it rewarding to build a y-block engine. |
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By aussiebill - 11 Years Ago
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yes, brought a few sets, they are 2250.00? USD from john, DEPENDS HOW YOU SHIP THEM WHAT FINAL FIGURE COSTS, SO APART FROM various shipping suggestions, plan on about $3200.00 AU.
Also, i doubt CNC portimg for cast iron heads would be viable or reliable due to the corrosion and inconsistancys in the thin areas in the exhaust port areas. All you want for sreet car are ECZ-G heads with port match and tidy up. All the glamour and whizbang stuff is for more performance related cars. My 2 cents worth.
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By pegleg - 11 Years Ago
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I would add to what Bill said, Mummert could Yea or Nay this when he gets a chance. Doing what Bill said, with maybe new valves and some pocket porting will get you 90% of what a 2 week per head porting job would. You won't notice the difference unless you drag race or run Bonneville. Then you need the Aluminum heads anyhow.
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By tomfiii - 11 Years Ago
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Due to casting shifts it would be better to extrude hone and or maybe have the areas matched up to gaskets and remove sharp corners. Rmember reading that some old tuners like to keep exhaust port velocities high.
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By aussiebill - 11 Years Ago
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Frank, thanks for your respected and relevant input ! keep on keeping on mate ! best regards bill.
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By CK - 11 Years Ago
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Thanks Bill, I figured about $3K. I've found DHL to be the best for me.
I should say it wasn't so much the size of the ports, I was interested in but the equilibrium of each port. Yes I opened them up but only replaced valves with std 1.92in + 1.54ex with about 0.480" lift. I am pretty crafty when I need to be yet I'm no match for a CNC machine. I guess I will start with flow benching and see what they are like" how balanced I have ported them. Apparently a good flow bench can show low & high current areas.
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By CK - 11 Years Ago
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I uploaded a photo to the original post. Its the only way I have been able to upload photos so far.
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By LordMrFord - 11 Years Ago
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pegleg (6/10/2014)
You won't notice the difference unless you drag race or run Bonneville. Then you need the Aluminum heads anyhow.
Top three world's quickest quarter mile Y-machines has iron heads. 
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By Hollow Head - 11 Years Ago
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Four. I think Ted went 8.9 with irons too. Or did he have aluminums already? Ted? Heck, has anyone gone under 9 with aluminums?
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By Ted - 11 Years Ago
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Hollow Head (6/12/2014)
Four. I think Ted went 8.9 with irons too. Or did he have aluminums already? Ted? Heck, has anyone gone under 9 with aluminums?
Without digging up the old files, I think the best my roadster went with iron heads was 9.60's. The EMC engine with the aluminum heads went into the roadster which is when it broke into the eights.
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By pegleg - 11 Years Ago
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Hollow Head (6/12/2014)
Four. I think Ted went 8.9 with irons too. Or did he have aluminums already? Ted? Heck, has anyone gone under 9 with aluminums?
And how many Turbos? I'm curious to see what Aluminum heads and dual turbos would run in an 1800 lb car!!
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By CK - 11 Years Ago
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Rolling bones, 188 mph nice one Ted Is Keith thinking of a re run with aluminium heads???
Revised ports, bigger valves, larger ratio rockers. the list goes on.
However I did work for a guy who got to toy with rotary valve heads many years ago. These would be interesting!!!
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By PF Arcand - 11 Years Ago
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Charlie Brown, your posting covers the subject of substantial improvements & modern knowledge for our favorite engine very well! As enthusiasts, we are very fortunate indeed...
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