cpayne

Granted a very "non-scientific" test but on the 710A (stock) I could suck on the vacuum nipple and open up the valve...however on the 710N I could not..is this just due to the increased spring rate of the 710N? Or does it require more pressure and time to open up the 710N...I have see posts but none on vacuum pressure...

Also what is the "advantage" of a large piston displacement of the 710N?

riceboy22

Check the graph from the BPV test at the link below. And dude, I hope you at least cleaned those things before your test!<ul><li><a href="http://www.s4biturbo.com/art-dvtests.shtml">http://www.s4biturbo.com/art-dvtests.shtml</a</li></ul>

cpayne

What the nipples? ;-)

cpayne

Thx Mike and nogaro22..any disadvantage to the increased vacuum pressure needed to open 710N?

riceboy22

and read Mike's article. 8^P

Seriously though, regurgitating what he wrote:

<I>"it looks as if the 110/710N will take a longer time to open, but, just because it comes open a few in. of Hg later, the typical vacuum pressure developed can be ten times this difference. So there should be no worries with a slow response time with any of these Bosch valves."</I>