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Finding best valve lash setting
https://www.slantsix.org/forum/viewtopic.php?t=23325		 Page 2 of 2
Author:  Sam Powell [ Tue Aug 07, 2007 7:26 pm ]
Post subject: 
Looser setting means less overlap, and more cylinder pressure, and more low end torque. I always ran my stock cams at .015 intake and .025 exhaust.
I got excellent mileage, in the twenties, and the sound was just that sweet clatter of good solid cams. One advantage is that out of spec ones tend to stand out more, and really rap audibly.

Sam
Author:  Rug_Trucker [ Tue Aug 07, 2007 7:34 pm ]
Post subject: 
Quote:
Jopapa,

What was your mileage before you set the valves?
and what were they set at before you changed them?

I was getting 18 mpg at .008 and .016.
After switching to .010 and .020, it went way up!

So thats double weird! :roll:
Interesting! I just thought mine went down because I drilled out my jets :lol:
Author:  Jopapa [ Tue Aug 07, 2007 7:48 pm ]
Post subject: 
Quote:
Looser setting means less overlap, and more cylinder pressure, and more low end torque. I always ran my stock cams at .015 intake and .025 exhaust.
I got excellent mileage, in the twenties, and the sound was just that sweet clatter of good solid cams. One advantage is that out of spec ones tend to stand out more, and really rap audibly.

Sam
I'll hafta try loosening them bit by bit to see if that affects mileage (and performance) at all for me. I figure I could start with the exhaust valves and leave the intakes where they're at for now, then once I find a good setting for the exhaust valves, work out the best setting for the intakes...
Author:  Jopapa [ Tue Aug 07, 2007 7:48 pm ]
Post subject: 
Quote:
Looser setting means less overlap, and more cylinder pressure, and more low end torque. I always ran my stock cams at .015 intake and .025 exhaust.
I got excellent mileage, in the twenties, and the sound was just that sweet clatter of good solid cams. One advantage is that out of spec ones tend to stand out more, and really rap audibly.

Sam
I'll hafta try loosening them bit by bit to see if that affects mileage (and performance) at all for me. I figure I could start with the exhaust valves and leave the intakes where they're at for now, then once I find a good setting for the exhaust valves, work out the best setting for the intakes...
Author:  Rug_Trucker [ Wed Aug 08, 2007 3:08 am ]
Post subject: 
I have been running mine set at .008 set cold intake and exhaust for a long time.
Author:  Aggressive Ted [ Wed Aug 08, 2007 8:34 am ]
Post subject: 
Quote:
I have been running mine set at .008 set cold intake and exhaust for a long time.
What kind of mileage are you getting?

Is it as bad as Jopapa's?
Author:  Rug_Trucker [ Wed Aug 08, 2007 7:43 pm ]
Post subject: 
I was getting 20-22 without the air. I drilled out the jets and it dropped to 16.7. Best mileage I got with the stock 1 bbl and head with a cracked exhaust manifold and the same mufflers was 29.5 at 65mph. Most of the time it got 25.5. All my mileage has been on 93 octane.
Author:  Jopapa [ Fri Aug 10, 2007 2:31 pm ]
Post subject: 
Okay I've now got my valves set at 0.012 and 0.022. I'll slowly enlarge the gap in my exhaust valves until I see negative effects on my gas mileage, and then set them to what gave me the best mileage. Then I'll do the same with the intake valves. Hopefully this will help me find the best setting for my valves. I have a feeling I'm going to go through quite a few valve cover gaskets in the process here :roll:
Author:  Rug_Trucker [ Fri Aug 10, 2007 3:09 pm ]
Post subject: 
[quote I have a feeling I'm going to go through quite a few valve cover gaskets in the process here :roll:[/quote]

3M weather strip adhesive on the valve cover, and wheel bearing grease on the head side of the gasket. Old air cooled VW trick. You have to set the valves on a bug every 2000 miles.
Author:  polara pat [ Fri Aug 10, 2007 5:40 pm ]
Post subject: 
Not to hi-jack your post but what would a good cold lash setting be after assembling a new motor. Maybe .008 and .018? then hot lash after break-in?
Author:  emsvitil [ Fri Aug 10, 2007 7:15 pm ]
Post subject: 
Cold lash .012 & .022
Author:  Aggressive Ted [ Sat Aug 11, 2007 10:35 am ]
Post subject:  Mileage
Jopapa,

Let me know if your mileage changes with the wider lash.
Run another can of Seafoam through it too.
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