Static Timing Type1 Issue
- hambone
- Post-Industrial Non-Secular Mennonite
- Location: Portland, Ore.
- Status: Offline
Static Timing Type1 Issue
This is odd, and not sure if I should even post this, but it has become irritating.
Timing my bus statically. Dwell checks perfect, set the timing with a lil' bulb. Perfect.
Drive the bus to get groceries etc. but it's just not quite right. Check timing again, it's off 5 deg. or so. Reset and it stays that way for a while.
This has happened to me the past 2-3 times. What the heck? The endless quest for perfection.
Timing my bus statically. Dwell checks perfect, set the timing with a lil' bulb. Perfect.
Drive the bus to get groceries etc. but it's just not quite right. Check timing again, it's off 5 deg. or so. Reset and it stays that way for a while.
This has happened to me the past 2-3 times. What the heck? The endless quest for perfection.
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http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
- sped372
- IAC Addict!
- Location: Waunakee, WI
- Status: Offline
Re: Static Timing Type1 Issue
Dwell staying exactly the same or is that also changing? Is your timing advance returning (back to "zero") all the way? I had an ever-so-slightly sticky advance that wouldn't always return to the exact same spot (within a couple degrees).
1971 Karmann Ghia - 1600 DP
1984 Westfalia - 1.9 WBX
1984 Westfalia - 1.9 WBX
- hambone
- Post-Industrial Non-Secular Mennonite
- Location: Portland, Ore.
- Status: Offline
Re: Static Timing Type1 Issue
Dwell stays the same.
Advance, I'll bet that's it. Just slightly askew when I set the timing.
I should probably run the engine for a minute before I set it, I usually do it cold.
Thanks!
Advance, I'll bet that's it. Just slightly askew when I set the timing.
I should probably run the engine for a minute before I set it, I usually do it cold.
Thanks!
http://greencascadia.blogspot.com
http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
- SlowLane
- IAC Addict!
- Location: Livermore, CA
- Status: Offline
Re: Static Timing Type1 Issue
Vacuum-only advance or centrifugal + vacuum?
I don't think it's possible to reliably static-time a motor with centrifugal advance. The weights, springs and rotor sleeve need to have that slight bit of pre-load that exists when running at idle. Without it, your rotor sleeve could be at any number of positions relative to the distributor shaft. If you manually turn the rotor CCW to the negative stop while static timing, it's unlikley that the weights and springs will be able to return it to that position.
I don't think it's possible to reliably static-time a motor with centrifugal advance. The weights, springs and rotor sleeve need to have that slight bit of pre-load that exists when running at idle. Without it, your rotor sleeve could be at any number of positions relative to the distributor shaft. If you manually turn the rotor CCW to the negative stop while static timing, it's unlikley that the weights and springs will be able to return it to that position.
'81 Canadian Westfalia (2.0L, manual), now Californiated
"They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance."
- Terry Pratchett
"They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance."
- Terry Pratchett
- Amskeptic
- IAC "Help Desk"
- Status: Offline
Re: Static Timing Type1 Issue
You can.SlowLane wrote: I don't think it's possible to reliably static-time a motor with centrifugal advance.
A) Statically time engine to "0" (1969 1600 singleport, right?)
B) Start engine and warm up until choke is off. Make sure idle is below 950rpm.
Check timing with light. Same? Of course.
No? wtf.
Colin
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- hambone
- Post-Industrial Non-Secular Mennonite
- Location: Portland, Ore.
- Status: Offline
Re: Static Timing Type1 Issue
Happened again after a rumbly 100 miles down hell roads. It has been speculated that the distributor clamp isn't doing it's job. New German too, what a crock. Betcha that's it though.
Local goons also ensure that aftermarket billet clamps are much better and don't slip.
Local goons also ensure that aftermarket billet clamps are much better and don't slip.
http://greencascadia.blogspot.com
http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
- Amskeptic
- IAC "Help Desk"
- Status: Offline
Re: Static Timing Type1 Issue
How about miles and miles of end play? End play can move that distributor drive gear a serious bunch of degrees. Statically time the engine with the crankshaft pulley pushed forward. Get an accurate base reading. Now have someone push the clutch pedal down, and recheck the timing. Change?hambone wrote:Happened again after a rumbly 100 miles down hell roads. It has been speculated that the distributor clamp isn't doing it's job. New German too, what a crock. Betcha that's it though.
Local goons also ensure that aftermarket billet clamps are much better and don't slip.
Holding a distributor in a clamp is not a difficult thing for even a junky clamp. Do a scratch line between the clamp and the distributor. Make sure the clamp is secure to the case!
Colin
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- sped372
- IAC Addict!
- Location: Waunakee, WI
- Status: Offline
Re: Static Timing Type1 Issue
I agree. There's really no torque (reason) for the distributor body to rotate on it's own unless things are pretty gummed up inside. I'd be surprised if a distributor rotated even with a loose clamp. A halfway decent clamp has a serious overkill grip on a part with no real motivation to turn anyway.Amskeptic wrote:hambone wrote:Holding a distributor in a clamp is not a difficult thing for even a junky clamp. Do a scratch line between the clamp and the distributor. Make sure the clamp is secure to the case!
Colin
1971 Karmann Ghia - 1600 DP
1984 Westfalia - 1.9 WBX
1984 Westfalia - 1.9 WBX