Xu9J4/rs

[markw 1]

Hi all,

 

Having built my new race spec XU9J4/RS hybrid engine and struggling to get it to start, the question came up on what crank pulley were

we using, is there a difference between the 19mi crank pulley and a gti6 one, if the teeth count is different this could be the cause of our

cam timing problems

 

thanks in advance

 

 

ps yes i did do a search, and i had not got a spare couple of hours to go through camerons 55 page encylopedia of building this type of engine

(as good as it is)

[rallyeash 155]

on my old xu9j4RS i ran the 1900 mi16 crank pulley using a Xu7 belt kit.

[markw 1]

good,

 

i have used an mi pulley too, but i think we used a gti6 cam belt? with catcams vernier pulleys

[welshpug 1,670]

tooth count is the same, but I think there is a difference in the woodruff key position between them, only half a tooth though IIRC.

[Miles 331 1 Cars]

Yes the XU9J4 and XU10J4 use the same drive wheel, the XU10J4RS (No idea on the R) is 1/2 tooth out with them, what length belt did you use as there is both 136 and 137 on the RS engine

[markw 1]

we have counted the bottom pulley at 21 teeth, the cam pulleys each have 42 teeth, a ratio of 2:1 which is right isnt it. i cant remember the tooth number on the belt