SwedeSpeed - Volvo Performance Forum banner

1 - 14 of 14 Posts

·
Registered
Joined
·
62 Posts
Discussion Starter #1
My B20 'clatters' (of course); I have an IPD valve cover (not yet installed; I think I warped it on my B18, so it's at the machine shop right now to check for flatness and/or be decked) that should shut things up a bit, but I thought I'd toss out a question: how tight could I lash my valves before I risk damaging either them, the seats, or the pushrods?<p> Note: I assume my 1970 B20 head is as stock. I haven't checked yet.
 

·
Moderator
Joined
·
1,579 Posts
Re: Valve lash & valve covers (Alaric)

For some reason, valve lash discussions tend to get emotional. It's like asking which candidate to vote for, or which stereo speakers to buy <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/rolleyes.gif" BORDER="0"> <p>That being said, I adjust motors with both the C and D cams for .016" hot, and I use this technique exclusively:<p> <A HREF="http://www.vclassics.com/archive/vadjtip.htm" TARGET="_blank">http://www.vclassics.com/archive/vadjtip.htm</A> <p>It makes a real difference. You may have to tweak the carbs a bit after the adjustment.
 

·
Registered
Joined
·
62 Posts
Discussion Starter #3
Re: Valve lash & valve covers (Phil Singher)

Phil,<p> ...worked like a charm! Still noisy, but quite livable! Thanks!<p> By the way... I barely had to touch the Strombergs. I may grow to like them yet (but I still have a visceral attachment to the SU).
 

·
Registered
Joined
·
19,952 Posts
Re: Valve lash & valve covers (Alaric)

Chris;<p>Try Phil's 0.016" hot with the feeler gauge meeting a strong resistance as you pull it away from the lifter - same resistance on each valve. Be sure no clearance change is being affected by the final tightening of the lock nut. If you still hear a bunch of ticky-ticky then look for the noise source elsewhere.<p>George Dill<p>
 

·
Registered
Joined
·
102 Posts
Re: Valve lash & valve covers (gdill2)

If it is still noisy, you might want to do a couple of things: <p>1) run thicker oil. <p>2) turn up the radio. <p>3) check the rocker arms. The rocker arms sometimes will pit on the valve side. Thus, no matter how much you adjust it with a feeler guage, you will never get it set right.<p>- John
 

·
Registered
Joined
·
62 Posts
Discussion Starter #6
Re: Valve lash & valve covers (jwernerny)

John,<p> I've had 3 Volvos now (a '62 122s, '68 144s, and '70 144s... yes, I'm partial to sedans), and I've become accustumed to the noise of a B18 coupled to an M40... especially (aargh) on the freeway. Just thought the B20 coupled with a BW35 might be a bit quieter (silly me). All cynicism aside, my engine's actually at a quite pleasant noise level now!<p> Can you enlighten me regarding rocker arm pitting? I haven't seen this, but may not know it's there.<p> N.B.: Radio? This is a 144! All 144's have gaping holes, not radios (laughing)!
 

·
Moderator
Joined
·
1,579 Posts
Re: Valve lash & valve covers (Alaric)

Rocker arms wear on the tips where they contact the valves. You can't get an accurate adjustment if there's a crater in the rocker. Almost always they can be polished out or re-radiused by a machine shop, although I've seen a few that were beyond that.
 

·
Registered
Joined
·
102 Posts
Re: Valve lash & valve covers (Phil Singher)

The <U>proper</U> solution is to call up John Parker and get a new rocker arm assembly with higher ratio rocker arms. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0"><p><br>"Speed is just a question of money. How fast can you afford." - billboard on machine shop in The Road Warrior
 

·
Moderator
Joined
·
1,579 Posts
Re: Valve lash & valve covers (jwernerny)

John hasn't offered the high ratio rockers in some time. Nor is additional gross lift necessarily desirable...
 

·
Registered
Joined
·
19,952 Posts
Re: Valve lash & valve covers (Phil Singher)

An old guy back in '69 told me that some high-miles B18's showed an unusual cam lobe wear pattern on #3 exhaust. Not sure if that is the case here or even if such wear could cause valve noise.<p>George Dill<p>
 

·
Registered
Joined
·
62 Posts
Discussion Starter #11
Re: Valve lash & valve covers (gdill2)

I've had my '70 about a month now, and am homing in on its 'noises'.<p> What I thought was piston slap on my '68 turned out to be the fiber cam gear (imagine my surprise)! Now that I've pretty much shut up the valves, I can hear a quieter version of the same noise, which is getting steadily louder as the oil cleans up, on my '70.<p> It had a few very good owners, and then a (apparently both suicidal and tasteless) teen owner. Heh. Like the tuck n' roll upholstery, though. But I could live without the mangled wiring.<p> Three oil changes in a month (and three Mann filters), and the oil's gone from black to grey. I've been afraid to put a dial indicator on the rocker arms... if I don't know a cam lobe's flat, it's not flat... right? (smile)
 

·
Registered
Joined
·
62 Posts
Discussion Starter #12
Re: Valve lash & valve covers (Phil Singher)

Phil,<p> Depending on the cam, the additional gross lift can definitely help 'dial-in' an engine build where the cam spec. wasn't quite right. In the case of my '65 B...er...20...the Delta cam that was installed didn't quite work with the carburetion... the rockers made the difference, according to the guy that built the motor. Definitely worked for me. *grin*<p> Having said that, I'm not familiar with the rocker arms in question. Whether or not they're available, would you be willing to enlighten me?
 

·
Registered
Joined
·
62 Posts
Discussion Starter #13
Re: Valve lash & valve covers (Phil Singher)

Phil,<p> If I understand the meaning of 'crater', I'm already using 'necked-down' feeler gauges; the gauge *only* meaures stem-to-rocker clearance, not the whole surface of the rocker arm (thank heavens for bench grinders and emery paper!)<p> Is this the meaning of 'crater'?
 

·
Moderator
Joined
·
1,579 Posts
Re: Valve lash & valve covers (Alaric)

Like pretty much any other engine mod, high ratio rockers can be an asset or a liability. If increasing lift were always good, all cams would be designed with more lift, no? The rockers in question were available here:<p> <A HREF="http://www.v-performance.com" TARGET="_blank">http://www.v-performance.com</A> <p>Yes, by "crater" I mean a depression in the tip of the rocker arm.
 
1 - 14 of 14 Posts
Top