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Author
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Topic: ptv clearance .544 lift
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ed650
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Member # 9897
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posted
 
 
91 block with flat top pistons afr 165 heads 333pt1 headgaskets cam is .512 lift with 1.6 and .544 lift with 1.7 ...does anyone know if ill have ptv clearance if I do go with the 1.7 rockers ?
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410w Hatch
306Ci Coupe
Posts: 1744 | From: menlo park | Registered: Apr 2010
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4IDFOX
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Member # 9921
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posted
You will have to check with clay on top of the pistons to know for sure. You can check with the 1:6's and see how much clearance you have if you are trying to decide to by 1:7's.
Lift has nothing to do with ptvc. It is valve event timing that dictates ptvc.
Also the hp difference between 1:6's and 1:7's is not very much.
Posts: 375 | From: Redding CA | Registered: Apr 2010
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jmcclesk
Moderator
Member # 1355
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posted
quote:
Originally posted by 4IDFOX:
You will have to check with clay on top of the pistons to know for sure. You can check with the 1:6's and see how much clearance you have if you are trying to decide to by 1:7's.
Lift has nothing to do with ptvc. It is valve event timing that dictates ptvc.
what he said
[ 2014-03-24, 01:04 AM: Message edited by: jmcclesk ]
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Ford trained ASE master tech.
Posts: 4024 | From: marrysville | Registered: May 2002
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Tom Renzo
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Member # 13165
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posted
I was just wondering why people always say PTV clearance has nothing to do with lift. Does a cam have more or less lift with a change from 1.6 to 1,7 rockers??? If yes it has more lift at OVERLAP!!!! Of course lift effects PTV clearance If it did not matter we would not be having this conversation!!!
Always check it!!
[ 2014-03-24, 11:24 AM: Message edited by: Tom Renzo ]
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I spend money i don't have. Building cars i don't need. To impress people i don't know.
Posts: 557 | From: CT | Registered: Sep 2013
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jmcclesk
Moderator
Member # 1355
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posted
Tom
I think what they mean is peak lift. They need to be more concerned with valve events before and after tdc at overlap. (like you said) Then after doing that see if the 1.7 will clear.
to the op is lobe lift around .340?? if so then
1.6 rocker arm is .544
1.7 rocker arm is .578
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Ford trained ASE master tech.
Posts: 4024 | From: marrysville | Registered: May 2002
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