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Author Topic: ABF Head  (Read 4303 times)

Offline jacko16v

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ABF Head
« on: 31 December 2008, 16:12 »
Just stripped a ABF lump to find all the inlet valves bent and a stripped cam belt,I have a spare KR head on its way, Will i get any performance gains/loss by putting the KR head on? What cams will be the best to use from the 2?


Cheers
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Offline danny_p

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Re: ABF Head
« Reply #1 on: 01 January 2009, 17:22 »
it'll work fine.

there are some differances,   the 051 head is small port , 027 is large port , abf heads are small port but with shorter valve guides to help flow.   with the 051  you'll loose a bit of power, the 027  will make less torqe in the lower revs but then go on to produce slightly more up top,  but tbh theres not much in it.   
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Offline rubjonny

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Re: ABF Head
« Reply #2 on: 02 January 2009, 09:33 »
the kr head combustioon chamber isnt as large as the ABF, it raises compression a tad and can cause piston-head contact unless you use a metal G60 gasket:
http://clubgti.co.uk/forum/showthread.php?t=177940
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Offline danny_p

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Re: ABF Head
« Reply #3 on: 02 January 2009, 10:24 »
stock abf is the best gasket avalible,   just dremmel the chambers back to the gasket,   the problem is no worse than with kr on 9a   
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Offline rubjonny

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Re: ABF Head
« Reply #4 on: 02 January 2009, 11:34 »
Duh yes of course you use the abf gasket, not the g60 one.  sorry about that had a brain fart :rolleyes:

Edit: the metal gaskets dont crush down quite as much as fibre ones apparently, I remember having a discussion about this with toyotec a while ago on the clubgti, though that was more to do with the different quoted compressions ratios between early/different 2.0 8vs.  But I think it was determined there wasnt that much in it compression wise and the differences were to do with the pistons, or maybe it was the quoted figures were wrong.  Can't remember now I'll see if I can dig up the thread...

Aha here it is, turns out pistons were different, and the metal/fibre gasket thickness is around .4 of a mm so not a huge difference:
http://clubgti.co.uk/forum/showthread.php?t=125392

I guess that extra .4 might be the difference between piston/head contact and not though!
« Last Edit: 02 January 2009, 12:01 by rubjonny »
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Offline danny_p

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Re: ABF Head
« Reply #5 on: 02 January 2009, 19:41 »
you acyualy get differances between chambers on same head anyway,   did lots of berreting of 16v heads and pistons
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Offline jacko16v

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Re: ABF Head
« Reply #6 on: 02 January 2009, 19:45 »
Ok sweet as then, next question is what pistons to lower compression for turbo use, been told 2E pistons will do the job?
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Offline danny_p

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Re: ABF Head
« Reply #7 on: 02 January 2009, 19:47 »
headwork cams and turbo ?


how much power and how much £££   btw  the pistons atrnt the issue  the rods go first
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Offline jacko16v

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Re: ABF Head
« Reply #8 on: 02 January 2009, 20:40 »
Got a spare head for the headwork, turbo and manifolds already sorted and thinking cams while its all in bits.  Its a long project thats well over budget allready so not really worried about the cash.

I read on vw vortex that 2E pistons and rods will be ok for turbo use, make sense or not?
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Offline rubjonny

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Re: ABF Head
« Reply #9 on: 03 January 2009, 14:29 »
they will lower compression yes, but you can also lower it by stacking 2 metal ABF head gaskets.  It does sound a bit dodge but it works and is a nice easy & cheap way to go about it. have a look for posts made by 'toyotec' on clubgti, he has been running boost on his this way for a long time, and he makes good power.  If you want to fit 2e pistons to do it iirc you need to machine them to make valve cutouts?  I think toyo used 2e rods as they're a bit beefy at one point, but not sure if he took them out again after.  When he talks to you you have to work very hard to keep up with what he is saying  :grin:
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