Road trip results
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Freshman User
Joined: Nov 2002
Posts: 31
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Road trip results
Well fellas, better late than never
After changing the timing set, setting the dizzy to 10 deg baseline, the mileage result is a good one.
On the road trip last weekend, pulling an 18 ft car trailer with 4 ft sides and a couple thousand pounds of goodies (Gross combined weight, truckand trailer, of 10,000lbs) the numbers are like this;
On gasoline 13.9 mpg (Imperial gallon)
On propane 9.8 mpg
Return trip trailer bare, side boards in the truck on propane 11.6 mpg
Both ways at 60-65 mph, lots of pedal on the hills
Didn't run gasoline on the way home, in order to get a bettter average, total round trip just over 800 miles of the BC interior, fiarly up and down, 2 lane highway. truck also has a Highrise canopy on it.
The results of the gearset to advance the cam and setting the dizzy at 10 deg, Alot more power and mileage towing has increased markedly, previous similar loads netted around 11 and week pulling on the hill, 9 if I got in a hurry (65+)
I did get some pinging at 10 deg on gas, but easily controlled by the right foot, suspect a baseline of 8 deg or runningh premium fuel would eliminate that.
Cheers
After changing the timing set, setting the dizzy to 10 deg baseline, the mileage result is a good one.
On the road trip last weekend, pulling an 18 ft car trailer with 4 ft sides and a couple thousand pounds of goodies (Gross combined weight, truckand trailer, of 10,000lbs) the numbers are like this;
On gasoline 13.9 mpg (Imperial gallon)
On propane 9.8 mpg
Return trip trailer bare, side boards in the truck on propane 11.6 mpg
Both ways at 60-65 mph, lots of pedal on the hills
Didn't run gasoline on the way home, in order to get a bettter average, total round trip just over 800 miles of the BC interior, fiarly up and down, 2 lane highway. truck also has a Highrise canopy on it.
The results of the gearset to advance the cam and setting the dizzy at 10 deg, Alot more power and mileage towing has increased markedly, previous similar loads netted around 11 and week pulling on the hill, 9 if I got in a hurry (65+)
I did get some pinging at 10 deg on gas, but easily controlled by the right foot, suspect a baseline of 8 deg or runningh premium fuel would eliminate that.
Cheers
Senior User
Joined: Jul 2002
Posts: 101
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From: USA
Road trip results
Old5,
Having read this post and your previous one on timing, I am lost as to what you mean by "dizzy". Is this the distributor? I would like to improve the power on my truck, and if I can do this by advancing the timing, that would be cool. You say that you had some pinging at 10 deg. on gas. Was that regular 87 octane? Also if I advance my timing to 20-25 deg. and ran 89 or 93 octane, would this control the pinging, or could I run 87 and just add octane boost? Thanks for the info.
Having read this post and your previous one on timing, I am lost as to what you mean by "dizzy". Is this the distributor? I would like to improve the power on my truck, and if I can do this by advancing the timing, that would be cool. You say that you had some pinging at 10 deg. on gas. Was that regular 87 octane? Also if I advance my timing to 20-25 deg. and ran 89 or 93 octane, would this control the pinging, or could I run 87 and just add octane boost? Thanks for the info.
Senior User
Joined: Jun 2001
Posts: 480
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From: Alabama
Road trip results
You can get better performance by advancing your distributor to a certain point. Too much advance = detonation which = $$$damage.
If you run a higher octance you can add more timing since the higher octane helps to stop detonation.
Don't use 20-25. 10 deg. advance is a good starting point. Make sure everything else is tuned up. I've run 14 degrees on 93, but typically just keep it at 10.
If you run a higher octance you can add more timing since the higher octane helps to stop detonation.
Don't use 20-25. 10 deg. advance is a good starting point. Make sure everything else is tuned up. I've run 14 degrees on 93, but typically just keep it at 10.
Posting Guru
Joined: Jan 2000
Posts: 1,899
Likes: 1
From: Cullman Alabama
Road trip results
Street killer, I'm having a little trouble with my timing (460) right now.
The book calls for 10 Btdc.
I put the zero degree drive gear on the Camshaft.
Now I cant get the engine to run very well when it's timed correctly.
It runs well when the base timeing shows nearly 20 Btdc.
The Vacuam advance and the mechanical advance works as advertised. It'l put the timing way out to something that looks like it's beyond 30 btdc.
But it will not hardly start when its hot. It also over heats a little running that fast.
No Pinging though!
It starts cold very well. No matter where the timing is left.
I just timed it by ear, and then checked my work with the light.
It shows almost 15 Btdc at base Idle.
I wonder if my vibration dampner has slipped on the Crankshaft?
The book calls for 10 Btdc.
I put the zero degree drive gear on the Camshaft.
Now I cant get the engine to run very well when it's timed correctly.
It runs well when the base timeing shows nearly 20 Btdc.
The Vacuam advance and the mechanical advance works as advertised. It'l put the timing way out to something that looks like it's beyond 30 btdc.
But it will not hardly start when its hot. It also over heats a little running that fast.
No Pinging though!
It starts cold very well. No matter where the timing is left.
I just timed it by ear, and then checked my work with the light.
It shows almost 15 Btdc at base Idle.
I wonder if my vibration dampner has slipped on the Crankshaft?
Thread Starter
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Freshman User
Joined: Nov 2002
Posts: 31
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Road trip results
Skeet Killer
Yep the Dizzy is the distributor
Your truck should have a 'Mass air' efi system, with a little research you could up your power easily, look around this site, there's lots of tech info, and a mass air sysytem is better than a spped density like I have.
You could advance the timing but you'd have to run premium most likely, as for Octane boosters, you'd have to try, I never have. At 10 deg with reg 87 fuelI can get some pinging but I have to be working the engine pretty good ie foot to the floor, high gear 6%grade. If I was only on gas i would try 8 deg.
I would look at other mods t5o up your power rather than just playing with the timing. ie k&n, straight up gears, cooler t-stat, headers/exhaust, adjustable fuel press reg etc
Look around this sightand see what you can find
Good luck
Yep the Dizzy is the distributor
Your truck should have a 'Mass air' efi system, with a little research you could up your power easily, look around this site, there's lots of tech info, and a mass air sysytem is better than a spped density like I have.
You could advance the timing but you'd have to run premium most likely, as for Octane boosters, you'd have to try, I never have. At 10 deg with reg 87 fuelI can get some pinging but I have to be working the engine pretty good ie foot to the floor, high gear 6%grade. If I was only on gas i would try 8 deg.
I would look at other mods t5o up your power rather than just playing with the timing. ie k&n, straight up gears, cooler t-stat, headers/exhaust, adjustable fuel press reg etc
Look around this sightand see what you can find
Good luck
Senior User
Joined: Jul 2002
Posts: 101
Likes: 0
From: USA
Road trip results
Old5,
I have already put on a K&N filtercharger, and a 4" exhaust. It runs great now, just looking for a little more.
Also, my truck is NOT mass air, it is an Ohio truck. Speed density for sure. Also I modified the snorkle tubes that run to the throttle body. I know that BBK makes twin 61mm throttle body that they say will give an extra 8-12hp, just not sure if I want to drop 340 bucks on it. I don't even have a chip for it YET
that is my next purchase. Thanks.
I have already put on a K&N filtercharger, and a 4" exhaust. It runs great now, just looking for a little more.
Also, my truck is NOT mass air, it is an Ohio truck. Speed density for sure. Also I modified the snorkle tubes that run to the throttle body. I know that BBK makes twin 61mm throttle body that they say will give an extra 8-12hp, just not sure if I want to drop 340 bucks on it. I don't even have a chip for it YET
that is my next purchase. Thanks.
