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yellaterra or not

Started by madtoranajzedded , Oct 31 2013 08:58 PM

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70 replies to this topic

#51 madtoranajzedded

Sir ask alot

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Posted 24 November 2013 - 02:52 PM

hi kiwi lilj,that first head looks like my old one,yella terra roller rockers are after market,that second head looks in stock form no posts in inlet

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#52 madtoranajzedded

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Posted 24 November 2013 - 02:55 PM

put the numbers up on the 12 port bud

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#53 kiwi-lilj

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Posted 24 November 2013 - 03:06 PM

92018914 12 port

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#54 gooley

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Posted 25 November 2013 - 07:01 PM

Sorry for interrupting this thread but what does it mean by 9 port and 12 port?

I am looking at the post kiwi-lilj with photos but can't tell or either I'm looking at it wrong.

Edited by gooley, 25 November 2013 - 07:02 PM.

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#55 _Bomber Watson_

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Posted 25 November 2013 - 07:24 PM

9 port (pre VB) had siamesed inlet ports. 12 port has an individual inlet and outlet port for both the intake and exhaust on each cylidner.

Madjzed, obviously the second one doesnt have posts, its a 12 port....

BTT, first one does look like a YT st3 from the shots, a pick of the back of the head if it has any numbers on it would be handy.

Second one, the 12 port, the valve holes look a touch bigger than stock, other than that hard to tell. Not sure if YT modded 12 ports, they did cast them in iron or alloy, but they had YT stamped all over them.

Cheers.

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#56 rodomo

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Posted 25 November 2013 - 09:42 PM

9 port (pre VB) had siamesed inlet ports. 12 port has an individual inlet and outlet port for both the intake and exhaust on each cylinder.

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#57 _Bomber Watson_

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Posted 25 November 2013 - 10:01 PM

What he posted ^

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#58 madtoranajzedded

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Posted 25 November 2013 - 10:19 PM

sorry bomber dont know what i was on,wasnt thinkin ,ill go back to my hole lol

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#59 S pack

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Posted 25 November 2013 - 11:05 PM

9 port (pre VB VC).

Fixed it for you DJ.

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#60 _Bomber Watson_

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Posted 26 November 2013 - 07:11 AM

Why did i tap vb when i used to have one and it had a red?

Yes, vc.

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#61 _Caustic_

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Posted 28 May 2016 - 08:53 PM

Hey Guys, I know this is an old thread,but is there any more information on this cylinder head. Im amazed this head hasnt struck water.Has it been cast this way from the factory or is it hand ported.thankyou all

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#62 _Bomber Watson_

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Posted 28 May 2016 - 09:03 PM

Impossible to tell anything from that shot, but is that a 12 port?

The round/D shaped exhaust port was a pretty cool trick in the 80's, if it does anything is beyond me.

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#63 warrenm

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Posted 29 May 2016 - 07:25 AM

Not cast from the factory like that, they were usually welded, then ported like that with a divider fitted into the inlet port to make them 12 port instead of 9.

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#64 _Caustic_

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Posted 30 May 2016 - 11:52 PM

Looking closely at it ,You could do this conversion on a radial arm drill.bore out the ports with an offset cutter, then press in the sleeves into the head, then seal weld the port. Then die grind the ports till their blended smoothly.
Phew...how much time have you got...Still love to know who created this head.Very talented.

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#65 _duggan208_

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Posted 31 May 2016 - 12:36 AM

I thought that XU1 heads had similar exhaust ports to that head, but not that big. Interesting head, whopping great cam for that to work.

regards

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#66 _Caustic_

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Posted 31 May 2016 - 10:18 PM

Im sorry to harp on about this head guys,im obsessed with it.Get this sucker on a flow bench.Im interested in the stats on this.cheers all.

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#67 _duggan208_

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Posted 31 May 2016 - 11:24 PM

Yeah, so am I

regards

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#68 _Bomber Watson_

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Posted 01 June 2016 - 09:28 AM

I recon the results would be underwhelming.

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#69 S pack

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Posted 01 June 2016 - 11:41 AM

I recon the results would be underwhelming

I reckon you'd be right. Bigger isn't always better.

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#70 madtoranajzedded

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Posted 01 June 2016 - 03:02 PM

Stupid question

I reckon you would need a copper exhaust gasket 😂made to stop it blowing through?

Just my thoughts

What effect on peformance would that have.minimal?

Edited by madtoranajzedded, 01 June 2016 - 03:16 PM.

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#71 nzxu1

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Posted 07 June 2016 - 04:33 PM

That 12 port head of yours with the aluminium divider was called a * Bathurst 12000 * model by yella terra but they have not been produced for many years now . l have one here that l bought approx. 25 years ago in Australia and then tried to bring it back to NZ as cabin baggage . l borrowed a soft bag from my bro - in - law and wrapped it up and carried it through customs long before metal detectors came into use between Oz and NZ . Unfortunately there was a guy waiting who was physically checking cabin bag weights so when l put my bag down and he tried to pick it up he nearly fell over not expecting the weight it actually was . Nice gentleman put it in the hold for free though for me saying that if it fell out of the overhead locker it would kill somebody . Someone has had a go at your head , they didn't come out the factory with those big D shaped exhausts but had modified square ports ...............look like a nice job though all the same .