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Join Date: Mar 2003
Location: dfw, texas
Posts: 1,137
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interference valve timing vs piston position
does any one know the exact timing, relative to the position of the piston, that the intake and exhaust valve is fully opened?
on an interference engine the exhaust valve must begin closing before the piston has reached the top of its stroke right? or are the intake valves the only valves in danger of not clearing the piston? i dont know the terminlogy but does anyone know the maximum distance each valve is lifted and for how long? (lift and duration i think)
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84 944 Non Alcoholic |
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11-30-2003, 12:26 AM
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Join Date: Jul 2001
Location: Edmonton, Alberta, Canada
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The exhaust are usually the first to get smoked (95% of the time).... as you have eluded to.
If the belt snaps while you are running at high rpm you may as well say good bye to all of them.... 
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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11-30-2003, 07:05 AM
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Location: dfw, texas
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what do our heads look like?
at the top of the exhaust stroke is the valve closing or completely closed?
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84 944 Non Alcoholic |
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12-01-2003, 06:39 PM
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Location: Madrid,Spain
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Timing with 1mm lift and zero valve clearance is:
intake opens 1º after TDC,and closes 49º after BDC;Exhaust opens 43º before BDC and closes 3º before TDC. (in the 2.5 liter)
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12-01-2003, 10:33 PM
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Location: dfw, texas
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is there something wrong with my font? this is what i see from Manute
"intake opens 1?after TDC,and closes 49?after BDC;Exhaust opens 43?before BDC and closes 3?before TDC."
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84 944 Non Alcoholic |
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12-06-2003, 01:01 AM
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Location: Madrid,Spain
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Dunno,may be....Only need to substitute ? with the degree celsius mark.Maybe is something with my spanish keyboard.
Received the manuals?I think third part did´nt arrive
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12-06-2003, 06:53 AM
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Location: dfw, texas
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ok cool thanks. maybe there is somehting i can download to understand.
i got the first two parts of the manuals. i cleaned out my inbox so the third one could go through buti guess it didnt work. that one is maybe too big? also what is a .rar file from?
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84 944 Non Alcoholic |
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12-06-2003, 11:14 AM
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Location: Madrid,Spain
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A .rar file is a compressed type of archive,just like Winzip,i think it´s a better one.You need to open it with a program called Winrar,wich you can extract .rar and .zip files too. I can send you the three parts in a zip,but at this point is better for you to download winrar and extract the ones you have.Here is a link:
http://www.rarlab.com/download.htm You can use it exactly like winzip. I´ll sent you the third part,if you have any problems just let me know.
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12-07-2003, 06:55 AM
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Location: dfw, texas
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hey alright it worked! and now i have a good unzipping program.
i owe you one!
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84 944 Non Alcoholic |
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12-07-2003, 11:40 AM
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Location: Madrid,Spain
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Quote:
 Hehehe luckily i don´t need that...enjoy it!
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12-08-2003, 12:56 PM
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