I never knew that the curves differed so much! I had wondered why
other listers had told me once that they reach full advance at around
2500rpm, but I don't hit full advance until redline. Thanks very much
for clearing up that mystery for me!
However, I have to disagree with you on the static settings. I have
verified with two separate strobe lights that my dizzy has 20 degrees
of mechanical advance (just as all other TR250/6 dizzies, to my
knowledge). On my dizzy, this 20 degree advance progressively
increases from idle through to redline. I assume that on the other
dizzy's, the advance curve is a steep line from idle to 2500 or so,
then a flat line after that.
Therefore, even though my dizzy advances more slowly, I still have to
keep 10 degrees of static advance in order to get a full 30 of total
advance (I limit myself to 30 degrees total advance due to increased
CR; stock engines run about 34 degrees total, and therefore run 14
degrees static). I have never seen a Triumph workshop manual that had
different static timing setting specs based on year of manufacture.
However, I wonder if any power gains can be had from switching to a
dizzy with the more aggressive advance curve... Anyone played around
--- Btp44@aol.com wrote:
> Tim-All TR6 dist curves are not created equal. I was looking at a
> manual at the various dist. specs. and noticed that the dist. used on
> 71 cars
> (41352) is quite different. The static timing is 4 deg BTDC and does
> not reach
> max advance of 26-30 deg until 5600 rpm. Most of the other dist.
> start with
> about 12 deg static, advance quicker, and have less total advance.
> The PI cars
> start with 11 deg, and reach max advance of 12-16 deg at only 2600
> rpm. I guess
> the bottom line is that using 10 deg. static timing on the 71 dist.
> will give
> too much total advance, if the compression has been increased.
> Berry Price
Do you Yahoo!?
Yahoo! Photos: High-quality 4x6 digital prints for 25"