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How do you identify wbx pulleys for timing?
Posted: 16 Jul 2014, 14:05
by silverbullet
More specifically, what does a 10 degree BTDC notch look like compared to a 5 degree one?
My maths says that on a 166mm dia (triple pulley) 1 degree = 1.45mm at circumference, so 10 degrees measures about 14 or 15 degrees from TDC.
Sounds like a silly question but it's not in the wiki
Re: How do you identify wbx pulleys for timing?
Posted: 16 Jul 2014, 21:02
by itchyfeet
The circumferance can be calculated from the 170mm diameter x 3.14 , it means 5 degrees is about 7.5mm around the circumferance on a standard pulley so 10 degrees is 15mm
easier imo than trying to measure angle in degrees
u shape is tdc v shape timing mark, engine rotates clockwise so timing mark is to the rhs (clockwise) of tdc for btdc timing as dg dj, other way round for atdc timing as on df
Re: How do you identify wbx pulleys for timing?
Posted: 17 Jul 2014, 22:41
by silverbullet
I said it was a silly question! Must be the heat....although all the pulleys I have are 10 degree ones.
Re: How do you identify wbx pulleys for timing?
Posted: 18 Jul 2014, 05:09
by itchyfeet
Reading your post again you had it right, you just wrote 15 degrees rather than 15mm and i thought you were trying to measure degrees
