This subject is confusing to most folks, myself included. 10-12* BTDC
STATIC (engine still) timing will produce approx. 4* ATDC DYNAMIC
(engine running) timing at idle (less than 1000 rpm). This setting will
allow the engine to fire in almost any properly set up TR6. With
Richard's modifications the engine will accept more advance, but 30*-34*
TOTAL advance at 5600+ rpm should be the maximum to save your slugs from
a fate like Tim's #6 piston. This is where recurvung the distributor
comes in and is a whole other subject.
No problem Richard, I blew my number six piston due to detonation,
wouldn't want to see it happen to anyone else if possible!
4BTDC is too retarded though. I wish I had a manual in front of me, but
I believe stock static timing setting is supposed to be about 14 or more
BTDC. Perhaps you are looking at the spec for dynamice timing?
But even this at idle would probably be 12-14 BTDC, unless vacuum retard
was hooked up, in which case it would be 4ATDC (yes, After,not Before).
Regardless - for a warmed up engine of your specs, I would recommend
10BTDC static. Remove and plug the vacuum retard.
--- Richard Seaton <email@example.com> wrote:
> I may have miss read the Bentley Manual when I set the timing since I
> had such a problem getting it to run. I ended up moving it quite a bit
> before it would
> fire. Once it started she ran pretty smooth.
> The timing is now at 4 BTDC per the manual for a stock engine. It
> has about
> 9.5:1 compression, Piper 270 cam and a lightened 16lbs flywheel.
> Since I can't
> drive it right now it will be awhile before the timing is really set.
> Thanks for your concern on the timing issue.
> Richard Seaton
> View My restoration @