- Tue Feb 18, 2020 4:56 pm
I realise I could run batch with just a missing tooth crank wheel but for various reasons I would like to go sequential.
As you say logically I would have expected a single pulse/signal from cam/distributor sensor to be sufficient to correctly sync phase for sequential. However looking thru Trigger Patterns & Decoders section of manual nothing seems to fit the bill.
Missing Tooth (cam) - quote from manual
"The wheel must have at least as many teeth as cylinders, not including the missing tooth. This generally requires double the number of teeth as cylinders or more. As many teeth, slots, or other readable features (sensor targets) as possible in the limited space is recommended in order to satisfy this requirement, and to maximize resolution. The sensor must be capable of reliably reading smaller or closely-spaced teeth."
Dual Wheel - quotes from manual
"The primary input should contain no missing teeth. Both pulses can run at either cam or crank speed, but sequential operations requires that the secondary pulse is located on the cam. The design of the secondary trigger can vary (Eg a single short tooth, half-moon wheel etc), provided it only provides a single pulse per revolution."
"Tooth #1 is defined to be the first tooth on the primary wheel AFTER the pulse on the secondary wheel."
So my understanding from this is:-
1. to use Missing Tooth (cam) I would need to construct a distributor wheel with at least 8 teeth.
2. to use Dual wheel I would need to use a crank wheel with no missing teeth and a distributor wheel which generates a signal pulse per rev.
I was expecting to be able to use Missing Tooth on crank in combination with single pulse on distributor but this does not appear to be supported for some reason?
I was also puzzled why the Dual Wheel uses a non missing tooth trigger wheel and then uses cam wheel to work out crank toot #1 - why not just use missing tooth wheel?