9YaTaH wrote:
drmini in aust wrote:
I don't bother with
static timing figures any more. Fuels have changed, cams are not stock, many heads have different chamber shapes, and most dizzys have 30 years of wear.
I advance them until they either ping, or feel a little rough- then retard until they are running sweet. Could be anything from 30-35* total advance. If it kicks back during starting, I retard a little more.
When you get it right, put a mark on the crank pulley and another on the timing cover (or a bit of sheet metal).
These marks set to line up using strobe timing light, with motor running at 4500rpm (ie full advance on all except an S dizzy)
Doc...I have heard and seen this work quite a few times now....just turn the dissy till the revs die, back a tad, check it aint pinging...make a mark. Set and forget....unbelievable
.
It's called `power timing'. Very easy to do with V8s in inboard boats, you can reach back, & turn the dizzy while you're driving..
Getting back to Minis..
Whatever dizzy advance you have, you need to run the motor fast enough for this so it's finished the centrifugal advance. Alfas 4 cyls use 5,200 rpm..
Cooper S used to advance all the way to 7,000.
But I bet now with the fuels we use, they would give more power with a convention dizzy curve that stops around 4000.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
