18,000 Mile valve adjustment.
#21
09-28-2012 | 09:20 PM
Senior Member
1st Gear Member
Joined: Mar 2010
Posts: 407
From: Rio de Janeiro, Brazil
Impossible to remove the head cover without removing the fan.
#22
09-28-2012 | 09:41 PM
Senior Member
1st Gear Member
Joined: Jun 2011
Posts: 1,135
From: San Francisco, CA
when you try to take the valve cover off the first time, you'll see....you start trying to take it out from the top...you twist it...turn it...it's like some stupid puzzle...but, something seems to always be in the way...
#23
09-28-2012 | 10:47 PM
Senior Member
Joined: Mar 2008
Posts: 3,406
From: N. Illinois
1st Gear Member
You can get it off on an 07 without removing the fan. It is a puzzel and I dont remember how I did it but I have never removed the fan. A few valve checks and the 351 instal.
Dan
Dan
#24
09-29-2012 | 03:22 AM
Thread Starter
|
Senior Member
Joined: Jul 2007
Posts: 163
From: Michigan
1st Gear Member
On my 07 I can get the cover off with the fan on, but, it is kind of a bitch as the throttle cables and wiring harness are in the way.
If I pull the wiring harness up and loosen the throttle cable nut on the carb I can swing the solid piece of the cable over and then get the cover off...
If I pull the wiring harness up and loosen the throttle cable nut on the carb I can swing the solid piece of the cable over and then get the cover off...
#25
07-12-2013 | 10:59 AM
Senior Member
1st Gear Member
Joined: Mar 2013
Posts: 866
From: SE Asia
CRANKCASE ASPIRATION at 5000 r.p.m.
Displacement Cubic ft. / Minute Cubic ft. / Second Litres / Minute Litres / Second
400cc 71 1.2 2000 33.3
450cc 79 1.3 2250 37.5
500cc 88 1.5 2500 41.7
550cc 97 1.6 2750 45.8
600cc 106 1.8 3000 50.0
650cc 115 1.9 3250 54.2
700cc 123 2.0 3500 58.3
750cc 132 2.2 3750 62.5
800cc 141 2.4 4000 66.7
850cc 150 2.5 4250 70.8
The total displacement of the engine is vented out of the crankcase on each downstroke and is sucked in during each upstroke. Total air flow (both up- and downstrokes) is double the value in the table. i.e. an 850cc engine at 5000 r.p.m. must exhaust 150 c.f.m., and must ingest an additional 150 c.f.m., for a total air volume displacement of 300 c.f.m. (8500 litres per minute).
If the crankcase breather tube is restricted due to fouling, dents, or inadequate size, the aspiration rate will be reduced. If the required volume of air is not aspirated, the pistons will be fighting an opposing vacuum on the upstroke, and will be fighting a positive pressure on the downstroke, thus robbing your engine of power and reducing peak r.p.m. If you have piston blow-by due to ill fitting, worn, or fouled rings, the crankcase is overpressurized on the power stroke and you can throw the data-table right out of the window. A previous post on the air flow rates of PCV valves indicated a maximum flow rate of less than 5 c.f.m. As you can see from the chart above, this flow rate is grossly inadequate for even the smallest engine.
Displacement Cubic ft. / Minute Cubic ft. / Second Litres / Minute Litres / Second
400cc 71 1.2 2000 33.3
450cc 79 1.3 2250 37.5
500cc 88 1.5 2500 41.7
550cc 97 1.6 2750 45.8
600cc 106 1.8 3000 50.0
650cc 115 1.9 3250 54.2
700cc 123 2.0 3500 58.3
750cc 132 2.2 3750 62.5
800cc 141 2.4 4000 66.7
850cc 150 2.5 4250 70.8
The total displacement of the engine is vented out of the crankcase on each downstroke and is sucked in during each upstroke. Total air flow (both up- and downstrokes) is double the value in the table. i.e. an 850cc engine at 5000 r.p.m. must exhaust 150 c.f.m., and must ingest an additional 150 c.f.m., for a total air volume displacement of 300 c.f.m. (8500 litres per minute).
If the crankcase breather tube is restricted due to fouling, dents, or inadequate size, the aspiration rate will be reduced. If the required volume of air is not aspirated, the pistons will be fighting an opposing vacuum on the upstroke, and will be fighting a positive pressure on the downstroke, thus robbing your engine of power and reducing peak r.p.m. If you have piston blow-by due to ill fitting, worn, or fouled rings, the crankcase is overpressurized on the power stroke and you can throw the data-table right out of the window. A previous post on the air flow rates of PCV valves indicated a maximum flow rate of less than 5 c.f.m. As you can see from the chart above, this flow rate is grossly inadequate for even the smallest engine.
#26
07-16-2013 | 12:27 AM
Member
1st Gear Member
Joined: Jun 2012
Posts: 91
From: Australia
CRANKCASE ASPIRATION at 5000 r.p.m.
Displacement Cubic ft. / Minute Cubic ft. / Second Litres / Minute Litres / Second
400cc 71 1.2 2000 33.3
450cc 79 1.3 2250 37.5
500cc 88 1.5 2500 41.7
550cc 97 1.6 2750 45.8
600cc 106 1.8 3000 50.0
650cc 115 1.9 3250 54.2
700cc 123 2.0 3500 58.3
750cc 132 2.2 3750 62.5
800cc 141 2.4 4000 66.7
850cc 150 2.5 4250 70.8
The total displacement of the engine is vented out of the crankcase on each downstroke and is sucked in during each upstroke. Total air flow (both up- and downstrokes) is double the value in the table. i.e. an 850cc engine at 5000 r.p.m. must exhaust 150 c.f.m., and must ingest an additional 150 c.f.m., for a total air volume displacement of 300 c.f.m. (8500 litres per minute).
If the crankcase breather tube is restricted due to fouling, dents, or inadequate size, the aspiration rate will be reduced. If the required volume of air is not aspirated, the pistons will be fighting an opposing vacuum on the upstroke, and will be fighting a positive pressure on the downstroke, thus robbing your engine of power and reducing peak r.p.m. If you have piston blow-by due to ill fitting, worn, or fouled rings, the crankcase is overpressurized on the power stroke and you can throw the data-table right out of the window. A previous post on the air flow rates of PCV valves indicated a maximum flow rate of less than 5 c.f.m. As you can see from the chart above, this flow rate is grossly inadequate for even the smallest engine.
Displacement Cubic ft. / Minute Cubic ft. / Second Litres / Minute Litres / Second
400cc 71 1.2 2000 33.3
450cc 79 1.3 2250 37.5
500cc 88 1.5 2500 41.7
550cc 97 1.6 2750 45.8
600cc 106 1.8 3000 50.0
650cc 115 1.9 3250 54.2
700cc 123 2.0 3500 58.3
750cc 132 2.2 3750 62.5
800cc 141 2.4 4000 66.7
850cc 150 2.5 4250 70.8
The total displacement of the engine is vented out of the crankcase on each downstroke and is sucked in during each upstroke. Total air flow (both up- and downstrokes) is double the value in the table. i.e. an 850cc engine at 5000 r.p.m. must exhaust 150 c.f.m., and must ingest an additional 150 c.f.m., for a total air volume displacement of 300 c.f.m. (8500 litres per minute).
If the crankcase breather tube is restricted due to fouling, dents, or inadequate size, the aspiration rate will be reduced. If the required volume of air is not aspirated, the pistons will be fighting an opposing vacuum on the upstroke, and will be fighting a positive pressure on the downstroke, thus robbing your engine of power and reducing peak r.p.m. If you have piston blow-by due to ill fitting, worn, or fouled rings, the crankcase is overpressurized on the power stroke and you can throw the data-table right out of the window. A previous post on the air flow rates of PCV valves indicated a maximum flow rate of less than 5 c.f.m. As you can see from the chart above, this flow rate is grossly inadequate for even the smallest engine.
Thread
Thread Starter
Forum
Replies
Last Post
