R. Riggs writes:
> > But why would a vacuum retard reduce performance?
>
> It slows throttle response.
I guess I could see this, since advance weight with springs would be
much quicker to respond than a loss of vacuum.
> > When I stomp on the gas, there's very
> > little vacuum left, and the advance on the distributer would be
> > advancing with engine rpm.
>
> Correct. But it's advancing from the retarded state it had reached just
> *before* you stomped on the gas. IE, at idle, instead of sitting at around
> 4 BTDC, all that vacuum retard (full retard available on my unit is 16
> crankshaft degrees) has pulled the timing to around 12 ATDC.
Wait... with full retard on, your car should be timed at 4 ATDC.
Static timing is at 8-12 BTDC depending on the year of your TR6.
(I knew what you meant... :-)
[... stuff deleted ...]
Let's assume for a minute that we have an total advance of 24 degrees
(I think) from the weights/springs in the distrbutor. Now we add an
additional 16 degrees of retard with vacuum. Can't I use this
combination to get even MORE advance? A total of 40 degrees? Of
course we'll need to run higher octane gas or will ping like a table-
tennis ball, and it's not linear, but it does give me a little more
room to play with. Man, this is confusing. :-)
> I've solved this problem, though, by replacing my wheels with cinder-blocks.
No fair! I solved the problem by buying another car that isn't road
worthy yet. :-)
> Kevin "No, don't feel sorry for me, I've just been bonding with my car for
> the last 4 years" Riggs
I just spend money to make more work for myself. :-)
-Scotty
|