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The Alloy 9 Port


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#76 _repco_

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Posted 25 June 2016 - 11:51 AM

Hi all. My port lumps arrived yesterday from ebay . $89.00 free postage.. All the bits and pieces that are needed are in the kit. Over the next few weeks ill be fitting them to a small chamber 9 port head. Not shore on valve sizes yet. or valve lift. I will post some figures when I do this. Phil.



#77 N/A-PWR

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Posted 25 June 2016 - 02:02 PM

Sounds interesting Phil,

 

 can you put up a picture of the lumps? :)



#78 LC-GTR-1969

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Posted 25 June 2016 - 08:42 PM

Hi all. My port lumps arrived yesterday from ebay . $89.00 free postage.. All the bits and pieces that are needed are in the kit. Over the next few weeks ill be fitting them to a small chamber 9 port head. Not shore on valve sizes yet. or valve lift. I will post some figures when I do this. Phil.

Please do, very interested. Great work mate



#79 _STRAIGHTLINEMICK_

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Posted 26 June 2016 - 06:53 PM

Good onya for taking up the challenge Phill , looks like we're going to learn something here . If this follows the theory we should see near 12 port air speed with nine port flow.

#80 _oldjohnno_

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Posted 26 June 2016 - 08:20 PM

Please forgive me for stating the bloody obvious but you're going to dummy all this up on a test head before grinding your "good" head, right?

 

I mean if the lumps are made for a Chev head (and I might have this all wrong) it'll take a fair bit of work to make them fit and hopefully work in the little Holden head. And that being the case it'd pay to fit the valves you're going to use into one pot of a junk head and mock up the lump with body filler. You can add or remove material as you wish until the port works and not have to worry about what to do when (not if) you remove too much material from the good head or good lumps.

 

Again, sorry to state the obvious but sometime people get a bit excited and forget one of the golden rules - never grind on your good head unless you know exactly what the outcome will be. And that's where the junk head comes in.



#81 N/A-PWR

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Posted 26 June 2016 - 08:32 PM

Funny that oldjohnno,

 

 I measured the 292 port here and see that the holden 9 port opened up,

 

 and the chevy L6 one are nearly the same.

 

 

 

Guess it is the chev design differences will be the difference.

 

 

Likewise, Phil may have different port insert's? 



I mean if the lumps are made for a Chev head (and I might have this all wrong) it'll take a fair bit of work to make them fit and hopefully work in the little Holden head.



#82 _oldjohnno_

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Posted 26 June 2016 - 08:47 PM

That's interesting Dave, I thought there would have been a bigger size difference.



#83 N/A-PWR

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Posted 26 June 2016 - 08:58 PM

he he,

 

I always like different point of view's in the quest to the better output. :)



#84 _STRAIGHTLINEMICK_

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Posted 26 June 2016 - 08:58 PM

Nope not much difference in size in garage port form .Removing the cast boss and opening the port at the front actually lowers airspeed .You can get the same flow by grinding the boss to a tear drop shape.

#85 _repco_

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Posted 27 June 2016 - 10:51 AM

Yes I am using a dummy head to see what the lumps do. My thought is to fit one lump in the dummy head and flow it as fitted. using no filler.., then use putty that can be easily shaped and removed where necessary to see if it improves or goes backwards . From just a quick look the lumps are 3 mm wider than a std inlet port entry.  I also have another theory that i'd like to try. Port tubes. I'm going to try and fit 10mm diameter or other size that will fit. copper tubes with .5 wall thickness to the inlet manifold to see if air speed over the range improves. Any thoughts on port tubes?????  Still no word on when there going to cast my alloy head.


Edited by repco, 27 June 2016 - 10:55 AM.


#86 _tassietreasures_

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Posted 07 November 2018 - 07:06 PM

Is anybody running one of these heads would be interested to hear a bit of feed back . cheers



#87 adam_73LJ

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Posted 02 July 2019 - 03:50 PM

Yes I am using a dummy head to see what the lumps do. My thought is to fit one lump in the dummy head and flow it as fitted. using no filler.., then use putty that can be easily shaped and removed where necessary to see if it improves or goes backwards . From just a quick look the lumps are 3 mm wider than a std inlet port entry.  I also have another theory that i'd like to try. Port tubes. I'm going to try and fit 10mm diameter or other size that will fit. copper tubes with .5 wall thickness to the inlet manifold to see if air speed over the range improves. Any thoughts on port tubes?????  Still no word on when there going to cast my alloy head.

Any more on the lump'd head? I'd like to hear more. 






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