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Discussion Starter · #1 ·
Can anyone give me some advice on ignition timing for a 10.5 - 1 compression 460 with a mild cam
 

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Can anyone give me some advice on ignition timing for a 10.5 - 1 compression 460 with a mild cam

The is NOT enough information here for anyone to answer the question.

Cylinder head type
Cam specs
Vehicle weight, type and intended use.
Transmission and stall if applicable.
Gearing and tire height?
Fuel type / octane?







Scotty J. "AKA" The "Mad Porter"
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Discussion Starter · #6 ·
What cylinder head? Cam specs? Current ignition components?
do3e heads very mild rv type cam sorry have noy got the specs handy distributor is a hall effect bosch unit used by Ford here in OZ with a bosch module
 

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Discussion Starter · #7 ·
do3e heads very mild rv type cam sorry have noy got the specs handy distributor is a hall effect bosch unit used by Ford here in OZ with a bosch module
vehicle is 1976 F100 manual gearbox 2.75 gears 31" tyres OZ 98 octane fuel
 

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vehicle is 1976 F100 manual gearbox 2.75 gears 31" tyres OZ 98 octane fuel


14 initial
20 mechanical in by 3000 to 3200 for a total of 34. Early castings don't typically want or need much more if quench is tight.

Domes and pistons sitting .035" in the hole are a different matter.

10 to 12 vacuum advance.





Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
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"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
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Discussion Starter · #9 ·
vehicle is 1976 F100 manual gearbox 2.75 gears 31" tyres OZ 98 octane fuel
thanks just for fun looked up the cam specs dur int 268 ex 288 lift in 481 ex 512 lsa 112 flat top pistons 0deck height
 

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thanks just for fun looked up the cam specs dur int 268 ex 288 lift in 481 ex 512 lsa 112 flat top pistons 0deck height
That is a modest cam. D3VE heads with the small spark plugs. 5/8" hex???

Early small chamber castings and flat tops is not pump gas appropriate.







Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
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Discussion Starter · #11 ·
yes small plugs. engine was built 20 years ago and i seem to remember checking the chamber size to get the comp ratio
 

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D3VE
E5TE
E6TE
E8TE

Essentially the same excepting accessory mounting boss bolt diameters.


You most likely have D3's

That should be fine.

Add a couple of degrees additional mechanical timing for 34 to 36.






Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
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ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
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Discussion Starter · #14 ·
yeh your probably right my old eyes are getting a bit tired. thanks for your help I will see how it goes
 

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Everybody can get all technical about heads, gears, seat covers….please. A good ballpark is 15-16 deg. If it pings or is hard to start, roll it back a degree or two. Mine is 10.5, trick flo top end, 274h cam. 15-16 deg starts great, runs cool, and pulls hard. On 93 pump gas.
 

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Everybody can get all technical about heads, gears, seat covers….please. A good ballpark is 15-16 deg. If it pings or is hard to start, roll it back a degree or two. Mine is 10.5, trick flo top end, 274h cam. 15-16 deg starts great, runs cool, and pulls hard. On 93 pump gas.

How many degrees of total timing are in a pulls hard?

Each individual combination of engine parts, vehicle etc have different needs.

The engine will tell you what it wants on a dyno both chassis and engine and in a measured distance via trap speed.

Proper tuning is the difference between mediocrity and kicking some a$$.



:D







Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
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How many degrees of total timing are in a pulls hard?

Each individual combination of engine parts, vehicle etc have different needs.

The engine will tell you what it wants on a dyno both chassis and engine and in a measured distance via trap speed.

Proper tuning is the difference between mediocrity and kicking some a$$.



:D







Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
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Hey Scotty, I've been watching your posts on this site for a couple of years now and have come to the conclusion IMHO that you are pretty much the authority when it comes to flow and valve train topics regarding BBFs.
On the topic of cam degreeing I was hoping I can get your professional opinion on a fairly simple situation. I'm wrapping up a stock rebuild on a 95 460 EFI engine for my F-350. All parts are stock oem spec, and controlled by the stock PCM. The new cam is stock with 110 degree intake lobe centerline. I have a Cloyes roller timing set with the three way crank keys. At the straight up timing setting I'm getting 110.75 degrees (3/4 degree retarded), which I'm assuming will only become somewhat more "retarded" with wear. I can advance 2 degrees which should give me a 1-1/4 degree advance beyond centerline, that's not much but I'm not sure the PCM would like it. What would the Mad Porter do - leave it 3/4 degree retarded or add the 1-1/4 degree advance?
Thanks Much!
afr
 

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In order to move the cam timing in 2 degree increments you will need a 9 key timing set.

What you do depends on how you are using the truck. If you are hauling advance it 2 degrees and let the chain stretch 1 degree.
If you want a bit more at the top install as is and let the chain stretch.

A couple of degrees isn't a huge deal with an oem cam.





Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Log In or Sign Up to View
 

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In order to move the cam timing in 2 degree increments you will need a 9 key timing set.

What you do depends on how you are using the truck. If you are hauling advance it 2 degrees and let the chain stretch 1 degree.
If you want a bit more at the top install as is and let the chain stretch.

A couple of degrees isn't a huge deal with an oem cam.





Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Log In or Sign Up to View
Thanks Scotty,
I searched the internet and various other Ford blogs and nobody else really had a definitive answer regarding advancing just one or two degrees to account for chain stretch. I do use the truck mainly for hauling / towing so I would have liked to advanced the timing 2 degrees and according to the instructions for my three key set (see pic) it looked like I should have been able to. it looks to me like the instructions clearly state a 2 degree change at the cam in relation to crank keys, but maybe I'm interpreting it wrong.
But you were absolutely correct, I moved the crank sprocket to the advance key and checked with the degree wheel and the intake lobe centerline did in fact advance 4 degrees not 2. Hopefully this post might help another novice double check their 3 way key instructions.
Thanks Again!
Mouth Human body Jaw Gesture Organism
 
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