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Holden 202 12 Port - Who is good at porting?

Started by _Ned Loh_ , Feb 19 2013 03:59 PM

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48 replies to this topic

#1 _Ned Loh_

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Posted 19 February 2013 - 03:59 PM

Looking to widen my circle a bit. Which shops/pros are experienced and good at (max) porting 202 12 ports?

Not looking for a shop that has done a few ok, and will happily have a crack. Looking for a shop that has ported/developed many, and really understands them. Suggestions please.

Cheers.

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#2 _coupe202_

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Posted 19 February 2013 - 06:22 PM

I would go and have a chat with Tony from Speedworks in Ringwood

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#3 _Bluejinx202_

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Posted 19 February 2013 - 10:37 PM

Hans from high port cyl heads in ferntree gully. He is ex HS and YT now has own shop. Has own flow bench and charts for recently ported 12 ports.

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#4 _Ned Loh_

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Posted 20 February 2013 - 06:42 AM

Hans from high port cyl heads in ferntree gully. He is ex HS and YT now has own shop. Has own flow bench and charts for recently ported 12 ports.

Cheers.

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#5 rodomo

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Posted 27 February 2013 - 09:42 PM

http://www.cavehillengines.com.au/ has a specialist porter that has worked for Pro-Drive (F@RD PERFORMANCE RACING)

I have recently had a 12 port done by him but I haven't used it yet.............

I have sprayed it with Glen-20 though to get rid of the F@RD germs.

Edited by rodomo, 27 February 2013 - 09:44 PM.

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#6 _oldjohnno_

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Posted 28 February 2013 - 05:46 AM

I have recently had a 12 port done by him but I haven't used it yet.............

What sort of flow did you end up with, if you don't mind me asking?

Tony Knight has done some good work with 12 port heads too, a year or two ago he posted some pics of one he ported that did 200cfm, though I'm not sure what bore diameter it was tested on.

The 12 ports are quirky to say the least, the secret seems to be to take everything you've ever learned from porting other heads and throw it all out the window...

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#7 rodomo

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Posted 28 February 2013 - 09:12 PM

What sort of flow did you end up with, if you don't mind me asking?

Flow? Figures? CFM and all that stuff?...............Too technical sorry..................If it goes orite I'll be happy.

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#8 _oldjohnno_

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Posted 01 March 2013 - 07:43 AM

Flow? Figures? CFM and all that stuff?...............Too technical sorry..................If it goes orite I'll be happy. :spoton:

So in other words, it flowed 345cfm in the top secret underground Rodomo lab-cave, and you'd be happy to show me how you did it. But then you'd have to kill me.

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#9 70 XU-1

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Posted 01 March 2013 - 10:06 AM

Hi OldJohnno, if you're still around I just PM'd you on another topic
(Sorry to hijack thread guys)

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#10 rodomo

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Posted 17 March 2013 - 10:32 PM

For your eyes only Johnno............................no-one else look......................O.K? :ph34r:

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#11 Potta

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Posted 17 March 2013 - 11:38 PM

Must be getting serious now Rob, I see you've bought an engine stand....

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#12 _oldjohnno_

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Posted 18 March 2013 - 07:38 AM

For your eyes only Johnno............................no-one else look......................O.K?

Wow, that's some radical port work you've got there, I can't wait to try some of those ideas...

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#13 orangeLJ

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Posted 18 March 2013 - 12:14 PM

I think the styrofoam dampners are really going to set Robs engine aside from the other "pretenders"

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#14 _Ned Loh_

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Posted 24 April 2013 - 01:29 PM

my follow up to this topic is that after talking to quite a few people, I don't think anyone really specialises in 202 12 ports and have really 'developed' them. Many places have done the odd one (or even a few) in the past, can port, and will take your money. Most places seem to be talking 170cfm to 190cfm (max) for their "full port".

I'd suggest that Oldjohnno knows more about the 202 12 port than any of the people I spoke with, and his 200cfm is a cracker of a result.

A couple of interesting things:

- plenty of well reputed people flowing and quoting numbers based on flow with a 4 inch bore.

- my just under 200cfm head went only 173cfm on another guys flow bench. I am fairly dark about that. No sure if it is a matter of calibration (for either or both of the benches), or if I was bullsh!tted. I'm seriously considering building a flow bench.

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#15 orangeLJ

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Posted 24 April 2013 - 01:49 PM

I know its a fair way away from you, and I'm not sure how much he is taking on,

but try giving top of the block a call (dave is the owner)

he is the bloke that has always done our head work (on a multitude of engines, from 600hp chevs to our 200hp 202s)

He just ported the YT alloy 12 port weve got and I know he has built a few group Nc engines in the past.

Maybe jsut give him a call and have a chat. He might impress, he might not, cant hurt though

http://www.yellowpag...41-listing.html

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#16 Peter UC

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Posted 24 April 2013 - 07:54 PM

As oldjohnno said try Tony Knight the thread below is a head he did for someone which flowed close to 200cfm. It seems finding a head that has core shifted the right way is key of getting flow out of the 12 port.

http://performancefo...den 202 rebuild

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#17 _Ned Loh_

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Posted 29 April 2013 - 08:18 AM

OrangeLJ - Thanks for the tip.

Peter UC - Head was ported by a very reputable person. Still not sure if I should take it up with the porter or not. I guess all I was trying to say in my earlier post was buyer beware. Some of the things people said, and the way some flow test left a lot to be desired. Maybe I am just difficult or have unrealistic expectations.

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#18 _Bomber Watson_

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Posted 29 April 2013 - 01:28 PM

Prolly moreso you expect to get what you pay for and not to get bullshitted to.... Something that rarely exists now days.

I wouldnt use chris milton, jst sayin.

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#19 _oldjohnno_

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Posted 29 April 2013 - 06:01 PM

No sure if it is a matter of calibration (for either or both of the benches), or if I was bullsh!tted. I'm seriously considering building a flow bench.

You can build a simple flowbench that will repeat to under 1% for less than a grand, and that includes a single variable speed vac motor that'll do about 200cfm @ 28" and a digital manometer, both of which I highly recommend. You can calibrate it with a set of ASME standard orifice plates so you can be assured of true readings. But if you build one be prepared for a couple of things: one, your missus will want a divorce because of all the time you'll spend on it, and two, the realisation that a lot of what you've been doing for the last couple of decades is wrong.

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#20 _Bomber Watson_

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Posted 29 April 2013 - 07:29 PM

Hmmm, looking at your realisations it seems i should build a bench.... Dont have a missus and have only been around a couple of decades so havnt done that much wrong.....

Spray booth or flow bench.... Hmmmmm

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#21 Litre8

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Posted 29 April 2013 - 08:52 PM

The first set of heads on L8, aluminium C ports, were ported by a reputable engine guy (without a flow bench). Later when I was changing cams (using a different engine guy) we diecided to get them flowed by Tom Coad (the guy that did the heads for Les Small on Grice's Chicadee Commodore)., they proved to be worse flowing than stock! My next pair of heads I had done by Tom himself.

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#22 _Ned Loh_

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Posted 01 May 2013 - 09:09 AM

You can build a simple flowbench that will repeat to under 1% for less than a grand, and that includes a single variable speed vac motor that'll do about 200cfm @ 28" and a digital manometer, both of which I highly recommend. You can calibrate it with a set of ASME standard orifice plates so you can be assured of true readings. But if you build one be prepared for a couple of things: one, your missus will want a divorce because of all the time you'll spend on it, and two, the realisation that a lot of what you've been doing for the last couple of decades is wrong.

I'll just have to train my two little fellas to do the bulk metal removal. Missus will love me for getting them out of the house...

Oldjohnno, Vizard seems to spruik (a little) both of these:

http://performancetr...flow_system.htm

http://www.audietech...what-it-is.html

Both look fairly simple, and quite importantly easy to use. Any comments?

Hmmm, looking at your realisations it seems i should build a bench.... Dont have a missus and have only been around a couple of decades so havnt done that much wrong.....

Spray booth or flow bench.... Hmmmmm

Simple - Do you want go, or show?

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#23 _Bomber Watson_

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Posted 01 May 2013 - 09:46 AM

I can use a booth, a bench i would have to learn stuff haha.

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#24 _oldjohnno_

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Posted 01 May 2013 - 09:21 PM

I'll just have to train my two little fellas to do the bulk metal removal. Missus will love me for getting them out of the house...

Oldjohnno, Vizard seems to spruik (a little) both of these:

http://performancetr...flow_system.htm

http://www.audietech...what-it-is.html

Both look fairly simple, and quite importantly easy to use. Any comments?

If you don't mind spending a little extra I think either of these would be great, the Audie unit in particular seems to have a very good reputation. I'd still tend to go with a variable speed motor; it's just so quick and easy to set the pressure that way. Bear in mind that most of the time you don't really need a direct readout in cfm, you just need to know whether it is getting better or worse as well as the manometer reading that's equivalent to your cfm target.