Tuning ignition timing
- Thread starter craigk
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Tuning ignition timing
Nope, it's not worth doing unless you have a vernier. That way you can accurately time the advance or retard.
Thanks
X
Thanks
X
and with a vernier how good it would it be? and is it worth doing?
Not sure how many degrees adjustment it allows, rallycinq or jimbro would be the best people to talk to about them. I never went that far on an 8v engine 
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With a decent cam I would imagine a nice benefit. My opinion for the money paid for verniers and cams, a nice 16v engine wouldn't go a miss.
Sorry.
thanks
X
.With a decent cam I would imagine a nice benefit. My opinion for the money paid for verniers and cams, a nice 16v engine wouldn't go a miss
.Sorry
.thanks
X
I've got a piper pulley sat in the shed somewhere, I'll have a look at the degrees it allows
Well, I actually did setup a vernier pulley for my 8V turbo, but I did not play with it, I set it to 0 to compensate for the height of the decomp plate. I actually even wrote a manual for that, but in Polish, never had enough motivation to write the English version. Anyhow, the PL version is here:
http://www.centomania.com/index.php?option=com_content&view=article&id=187:ustawianie-rozrzdu-przy-pomocy-regulowanego-koa-&catid=33:manuale&Itemid=109
The scale on the vernier pulley says -30 to 30 degrees, but that's only a scale. From what I remember it is not settable beyond -15..15. But this is more than sufficient. More than that you can equally well just move the timing belt by 1 tooth and start over from 0.
As said, never had time to play around with it to see what can be done to boost the engine even more.
If there is more interest I can be convinced to translate the manual
http://www.centomania.com/index.php?option=com_content&view=article&id=187:ustawianie-rozrzdu-przy-pomocy-regulowanego-koa-&catid=33:manuale&Itemid=109
The scale on the vernier pulley says -30 to 30 degrees, but that's only a scale. From what I remember it is not settable beyond -15..15. But this is more than sufficient. More than that you can equally well just move the timing belt by 1 tooth and start over from 0.
As said, never had time to play around with it to see what can be done to boost the engine even more.
If there is more interest I can be convinced to translate the manual
Asteris
Member
What is the height of your decomp plate and how many degrees did you had to add?
the title of this thread asks about ignition timing... why are we talking about cam timing?
btw cam timing on a standard engine can be a few degrees off from the factory (talking 8valve not 16 valve which have the cams locked so timing will always be spot on)
btw cam timing on a standard engine can be a few degrees off from the factory (talking 8valve not 16 valve which have the cams locked so timing will always be spot on)
The plate is 2.5mm plus two thin metal HGs minus considerable head skim. I would say 1.8mm total lift, give or take. The timing is 4 degrees from 0 on the scale, but I honestly cannot tell if the 0 point matches the original pulley's 0 point. (Though 4 degrees makes sense according to my paper calculations).
Because that's what we think is implied ?... Don't really know
Interesting this stuff about 8V, you saying I wasted money on my vernier pulley? I know the timing belt defo has some slack and elasticity that makes the actual timing different, but I had no idea it's that big of a slack...
no,,, the pulley is worth it on a 8v... on a 16v its not... infact it would be impossible to fit on on a 16v.
Asteris
Member
Do you mean that the camshaft pulley notch is not tight enough and lets camshaft to play a few degrees, or this is due to the belt?
maybe. I guess if all the overall tolerances add up then it can be bad
