Ok, so my mind is baffled. I installed a cam at +4degrees per the timing recommendations, and my FBO limiter plate people suggest I set my timing at 18 degrees initial. Soooo so I set it at 14….18…..or 22 degrees initial?? Been a minute since I messed w this stuff and prior to, all my cams were set ‘straight up!’
Ok…..basic ‘I should know this….’ question!!
- Thread starter V24x2
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For what ever it's worth TDC is still TDC regardless of what the cam is set to.
Set the initial where you want, then play with it.
Set the initial where you want, then play with it.
What cam are you running?
You might start at 16 initial and see how that performs.
If you are looking for 36 all in, and you're thinking 16 initial, then set the plate at 20.
If you find you need more initial, you'll need to adjust the plate.
If you are looking for 36 all in, and you're thinking 16 initial, then set the plate at 20.
If you find you need more initial, you'll need to adjust the plate.
There's some good starting points here on site. And ,as stated, timing of TDC in relation to the distributor is independent of cam phasing.
Distributor starting point for a curve
Everything you wanted to know about ignition advance
Distributor starting point for a curve
Everything you wanted to know about ignition advance
Rmoore
Well-Known Member
Maybe I misunderstanding here , cam timing as nothing to do with initial timing ….
67Dart273
Well-Known Member
Before you get too far "down that road" I'd post what exactly cam this is and what folks recommend to run it for "degree." Just blindly setting it to so called +whatever is A no guarantee that is where you want it for performance of your combination, and B---no guarantee with machining tolerances, that is actually where it is set. In other words you should "degree it" and there are LOTS of videos and other "how to's" on the internet as to how.
Ironracer
Gearhead
Yeah, What He Said! see above
mopowers
Well-Known Member
Pretty sure the OP is confusing cam timing and ignition timing. Someone break it down for him.
In general, cam timing of +4 degrees has NOTHING to do with ignition timing.
If they suggested 18 degrees, try it. It's not hard to move it if it needs an adjustment.
If they suggested 18 degrees, try it. It's not hard to move it if it needs an adjustment.
Ironracer
Gearhead
Especially with the plate!
I run very light springs or a locked dist. if a race car and time total
advance and let initial advance fall wherever it does.
advance and let initial advance fall wherever it does.
Crane 693802
.467/.494
278/290 duration
222/234 @050
this was a simple cam swap in the driveway into a semi tired 340 motor. I might have too light of springs on the advance weights….maybe go 1 light/1 medium!
Ok…..this does help. Don’t worry about the 4 degrees cam setup….ok! Perfect answer! Lol. Just time it as if I was timing any ol car! Sweet!
Rat Bastid
Dunamis Metron
Just a driveway cam swap, heads never came off, no degreeing just a 4 degree advance per the cam card.
Rat Bastid
Dunamis Metron
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