Valve to Valve Clearance.
#11
01-30-2010, 09:50 PM
Join Date: Feb 2008
Location: erial,NJ
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Those responses were awesome and very helpful, thanks for your replies.
My motor last year, (2007 n.train 107 twin cam) made 116/118 0n motor, 166/165 on nitrous dynoed by JD Cycles. Can't wait to see what it does with more compression and a different cam. What ya think for my first scoot? Dad and Grampa were true to the core HD riders, it just took me alittle while.... lovin it LOL !!
Thanks Again,
Augie.
My motor last year, (2007 n.train 107 twin cam) made 116/118 0n motor, 166/165 on nitrous dynoed by JD Cycles. Can't wait to see what it does with more compression and a different cam. What ya think for my first scoot? Dad and Grampa were true to the core HD riders, it just took me alittle while.... lovin it LOL !!
Thanks Again,
Augie.
#14
01-31-2010, 01:11 PM
Join Date: Feb 2008
Location: erial,NJ
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Yes, it is , but my crankshaft run out was an unbelievable .0008 ten thousanths of an inch before I started to gamble. I re- checked it after a very hard season and it hasn't changed. Everything inside looked brand new. I wouldn't suggest it, but I'm a gambler. This bike will ride the back tire(shinko) as well as any rice rocket out there !
Augie.
Augie.
#15
12-01-2017, 05:58 PM
as the exhaust valve closes, the inlet opens
this is known as the overlap
the valve heads obviously pass each other during this action
at some point they will reach their closest proximity
that is the valve to valve clearance
if it is too little, as in a negative value, they will clip(hit) each other
the minimum gap between them at any time needs to be(for a street type engine) around 0.040
with different cams duration and lift is also likely to be different, so there is a need to make sure you have adequate v2v clearance
oversize valves is another common issue
there are tools made especially to check this
they are also commonly used on flow benches to measure cfm at different lifts
you may also be able to see via a port, or plug hole
this is known as the overlap
the valve heads obviously pass each other during this action
at some point they will reach their closest proximity
that is the valve to valve clearance
if it is too little, as in a negative value, they will clip(hit) each other
the minimum gap between them at any time needs to be(for a street type engine) around 0.040
with different cams duration and lift is also likely to be different, so there is a need to make sure you have adequate v2v clearance
oversize valves is another common issue
there are tools made especially to check this
they are also commonly used on flow benches to measure cfm at different lifts
you may also be able to see via a port, or plug hole
#16
12-01-2017, 08:03 PM
Seasoned HDF Member
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