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Sam Powell
 Post subject:
PostPosted: Tue Aug 07, 2007 7:26 pm 
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Joined: Sun Jun 04, 2006 4:53 pm
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Location: Gaithersburg MD
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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
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PostPosted: Tue Aug 07, 2007 7:34 pm 
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Turbo EFI
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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! :roll:


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

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto :-( Dually Clubcab needs a injector pump
2005 Golden Couch Buick
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Jopapa
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PostPosted: Tue Aug 07, 2007 7:48 pm 
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Turbo EFI
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Joined: Tue Nov 12, 2002 2:50 pm
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Location: Spokane Valley, WA
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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
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PostPosted: Tue Aug 07, 2007 7:48 pm 
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Location: Spokane Valley, WA
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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
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PostPosted: Wed Aug 08, 2007 3:08 am 
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I have been running mine set at .008 set cold intake and exhaust for a long time.

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto :-( Dually Clubcab needs a injector pump
2005 Golden Couch Buick
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Aggressive Ted
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PostPosted: Wed Aug 08, 2007 8:34 am 
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Location: Black Diamond, WA
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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 ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG
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Rug_Trucker
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PostPosted: Wed Aug 08, 2007 7:43 pm 
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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 on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto :-( Dually Clubcab needs a injector pump
2005 Golden Couch Buick
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Jopapa
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PostPosted: Fri Aug 10, 2007 2:31 pm 
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Location: Spokane Valley, WA
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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:

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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
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PostPosted: Fri Aug 10, 2007 3:09 pm 
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[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.

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto :-( Dually Clubcab needs a injector pump
2005 Golden Couch Buick
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polara pat
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PostPosted: Fri Aug 10, 2007 5:40 pm 
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Turbo Slant 6

Joined: Tue Jul 10, 2007 8:08 pm
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Location: Nelson, B.C.
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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
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PostPosted: Fri Aug 10, 2007 7:15 pm 
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Joined: Thu May 12, 2005 11:50 pm
Posts: 6291
Location: So California
Car Model: 64 Plymouth Valiant
Cold lash .012 & .022

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64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

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Aggressive Ted
 Post subject: Mileage
PostPosted: Sat Aug 11, 2007 10:35 am 
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Location: Black Diamond, WA
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Jopapa,

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

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Aggressive Ted



http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger





74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG
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