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Streetracing.co.za • View topic - small port intake manifold on a blacktop 20v head?
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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Thu Mar 29, 2012 7:17 pm 
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Awesome to help were ever i can!! :thumb:

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Thu Mar 29, 2012 9:54 pm 
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So it was not about the the extra valve but more of the position of the valve, nice post, well I take in all the info yourl given me, I just like to through in other options to find out if its going to work or not,
AT RXI bud you have the high com piston, and its on the BT head, so you had to pocket the piston, but I have the low 8.0.1 piston, way deeper dish, I know now the valve are at diff positions, but they won't touch the pistons, so I won't need to pocket them right?

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Thu Mar 29, 2012 10:01 pm 
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the 8.9 pistons have to be pocketed aswell on the exhaust side... as for the 8:1 the crown height should be the same.. which means the exhaust side should still touch.. post a pic of the ze piston please!

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 12:00 pm 
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my z piston


Attachments:
ze_Photo0125.jpg
ze_Photo0125.jpg [ 179.37 KiB | Viewed 11907 times ]

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 12:27 pm 
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Is it me or is that piston oval :shock:

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 12:32 pm 
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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 12:34 pm 
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Lol man tilt your head and look at it looks like a egg man ?

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 12:52 pm 
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Actually you don't get a round piston anyway...

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 12:55 pm 
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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 1:07 pm 
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lol it is, had to edit the pic, was to large to upload,
but what do you think of it?need to be pocketed?for 20v?

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 1:47 pm 
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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 1:47 pm 
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what is your piston height from centre of wrist pin to top of piston?

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 2:27 pm 
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Easier to measure from top of the pin hole to the top of the piston and add half the pin thickness. Otherwise how do you know you're in the middle of the hole while measuring... :lol:

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 2:31 pm 
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Lol good one, will post on tuesday, don't have the pistons currently with me, its at home and I work at a different location, but from what yourl can see, its deep, n da valve cut outs are very wide position

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 2:44 pm 
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cant judge by pictures for piston and valve clearance bru.. just now we say it works and u moer it 8000rpm and it touches!!!

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 2:44 pm 
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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 3:11 pm 
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The GZE pistons is exactly the same heigh as the others, it just had the pocket. So you'll have to cut the valve recesses too...

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 3:28 pm 
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So it will only touch reving it high up, and that's because 20v has more lift, I guys I should just stick to the basics 4now,
Another question, to fit this pistons,can I just fit them on or must I balance them before that?or fit and balance the whole bottom end?

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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 3:48 pm 
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 Post subject: Re: small port intake manifold on a blacktop 20v head?
PostPosted: Fri Mar 30, 2012 3:57 pm 
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