 Valve Timming quick reference |
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| -JR- |
  Feb 28 2005, 07:49 PM
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#1
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Life goes faster at 150MPH  Group: Members Posts: 276 Joined: 12-May 04 From: Victoria BC Canada Member No.: 2,055  |
I'm troubleshooting some blow back I'm getting on a new, never run, engine.
At Top Dead Center (ATDC) Cylinder---Intake-----------------Exhaust 1-----------CLOSED----------------CLOSED 2 3 4 Options – OPEN / CLOSED / OPENING / CLOSING Can anyone complete this chart for me? But I’m mostly interested in 3 and 4. If someone knows it, can they tell me if the 1and 3 valve positions are the same as 2 and 4 when the crank is 180deg out from TDC? Thanks! -JR- Soon to be driving his 914 |
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| Dave_Darling |
Mar 1 2005, 01:43 PM
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#2
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Crap, I wish I had time to do this up correctly...
Four stroke engine; intake-compression-power-exhaust. On the intake stroke, the intake is open. On the compression stroke, both valves are closed. On the power stroke, both valves are closed. On the exhaust stroke, the exhaust valve is open. "TDC" is TDC between the compression and power strokes. Both valves will be closed. Firing order, as noted, is 1-4-3-2. So at TDC#1: #1 is between compression and power. #4 is between intake and compression. #3 is between exhaust and intake. #2 is between power and exhaust. #1 both valves are closed #4 intake valve may be open; if so it is starting to close or will be soon. #3 one or both valves may be open; exhaust is closing and intake is opening. #2 exhaust valve may be open; if so it will be closing soon. --DD |
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Posts in this topic
-JR- Valve Timming quick reference Feb 28 2005, 07:49 PM
type47 only help i can give is firing order 1-4-3-2 (if i... Feb 28 2005, 08:47 PM -JR- Ha ha... Thanks, but I'm well past that.
But... Feb 28 2005, 09:18 PM ArtechnikA Mar 1 2005, 06:07 AM ClayPerrine Here is a simple (well, simple to me) way to do th... Mar 1 2005, 08:21 AM joes There is a hole in the bottom of the transmission ... Mar 1 2005, 08:39 AM
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