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Finding best valve lash setting
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Sam Powell
Supercharged


Joined: 04 Jun 2006
Posts: 3766
Location: Gaithersburg MD

Post subject: (Tue Aug 07, 2007 7:26 pm) Reply with 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



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Rug_Trucker
Supercharged


Joined: 23 Feb 2005
Posts: 2771
Location: Pertneer Nashville TN

Post subject: (Tue Aug 07, 2007 7:34 pm) Reply with quote

Aggressive Ted wrote:
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! Rolling Eyes


Interesting! I just thought mine went down because I drilled out my jets Laughing



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'72 Duster 198 stock cam, 3:23's Hookers

'74Fart Dart Razz

'79 Maxivan 360 Offy Qjet Comp RV cam
93 D350 160HP Cummins Auto Sad Dually Clubcab
93 Corolla
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Jopapa
Turbo EFI


Joined: 12 Nov 2002
Posts: 1753
Location: Spokane Valley, WA

Post subject: (Tue Aug 07, 2007 7:48 pm) Reply with quote

Sam Powell wrote:
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...



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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me
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Jopapa
Turbo EFI


Joined: 12 Nov 2002
Posts: 1753
Location: Spokane Valley, WA

Post subject: (Tue Aug 07, 2007 7:48 pm) Reply with quote

Sam Powell wrote:
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...



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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me
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Rug_Trucker
Supercharged


Joined: 23 Feb 2005
Posts: 2771
Location: Pertneer Nashville TN

Post subject: (Wed Aug 08, 2007 3:08 am) Reply with quote

I have been running mine set at .008 set cold intake and exhaust for a long time.



_________________
'72 Duster 198 stock cam, 3:23's Hookers

'74Fart Dart Razz

'79 Maxivan 360 Offy Qjet Comp RV cam
93 D350 160HP Cummins Auto Sad Dually Clubcab
93 Corolla
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Aggressive Ted
Supercharged


Joined: 15 Jan 2007
Posts: 3709
Location: Black Diamond, WA

Post subject: (Wed Aug 08, 2007 8:34 am) Reply with quote

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?



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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live.com/self.aspx/74%20Dodge%20Dart%20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, ram air, electric fans, 2.5" HP2 & FM70 exhaust, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG
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Rug_Trucker
Supercharged


Joined: 23 Feb 2005
Posts: 2771
Location: Pertneer Nashville TN

Post subject: (Wed Aug 08, 2007 7:43 pm) Reply with quote

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.



_________________
'72 Duster 198 stock cam, 3:23's Hookers

'74Fart Dart Razz

'79 Maxivan 360 Offy Qjet Comp RV cam
93 D350 160HP Cummins Auto Sad Dually Clubcab
93 Corolla
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Jopapa
Turbo EFI


Joined: 12 Nov 2002
Posts: 1753
Location: Spokane Valley, WA

Post subject: (Fri Aug 10, 2007 2:31 pm) Reply with quote

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 Rolling Eyes



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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me
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Rug_Trucker
Supercharged


Joined: 23 Feb 2005
Posts: 2771
Location: Pertneer Nashville TN

Post subject: (Fri Aug 10, 2007 3:09 pm) Reply with quote

[quote I have a feeling I'm going to go through quite a few valve cover gaskets in the process here Rolling Eyes[/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.



_________________
'72 Duster 198 stock cam, 3:23's Hookers

'74Fart Dart Razz

'79 Maxivan 360 Offy Qjet Comp RV cam
93 D350 160HP Cummins Auto Sad Dually Clubcab
93 Corolla
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polara pat
Turbo Slant 6


Joined: 10 Jul 2007
Posts: 629
Location: Nelson, B.C.

Post subject: (Fri Aug 10, 2007 5:40 pm) Reply with quote

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?



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emsvitil
Supercharged


Joined: 12 May 2005
Posts: 4936
Location: So California

Post subject: (Fri Aug 10, 2007 7:15 pm) Reply with quote

Cold lash .012 & .022



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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes
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Aggressive Ted
Supercharged


Joined: 15 Jan 2007
Posts: 3709
Location: Black Diamond, WA

Post subject: Mileage (Sat Aug 11, 2007 10:35 am) Reply with quote

Jopapa,

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



_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live.com/self.aspx/74%20Dodge%20Dart%20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, ram air, electric fans, 2.5" HP2 & FM70 exhaust, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG
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