Advancing The Cam Timing

[sutol 0]

I'm fitting a new cam belt to my 1.9 Mi16 tomorrow and need help.

 

Is it advantagous to advance the cams a few degrees power wise? It is posible to gain a couple of degrees advance via the adjuster pulleys and I wondered how much can I get away with and will it give me a little more HP on this engine.

 

Doing it tomorrow

[sutol 0]

Just searched through 38 pages and found that every engine is different. No one commiting themselves then?

 

With other engines I have messed with over the years I have found it better to use a little more cam advance than the factory recomends. I dont know why this is but it has always made for a better performing engine so I was wondering if the same is true for Peugeot and in particular the 1.9 Mi16.

 

Cant be bothered finding true TDC with dial gauges and dialing in the cams, just interested if anyone favoured setting the belt up giving a few degres advance to the cams or will I destroy the engine

[petert 588]

No one commiting themselves then?

 

Impatient?

 

You can definitely advance the standard inlet cam without sacrificing top end power, because the std. cam has enough duration to maintain top end power. If you advanced an XU10J4R cam for example, you'd severely hurt the top end.

 

To illustrate my point, PSA released the XU9J4 with two different inlet pulleys and the XU9J4Z with one in between the two. ie

 

pulley stamp

#2 - 114 deg. intake centreline (max. lift ATDC) (early D6C)

#3 - 111 deg. intake centreline (DFW)

#4 - 107 deg. intake centreline (late D6C)

 

The early and late D6C's were both rated at 160hp. The #2 pulley is way to retarded for my liking and pushes the power band too high. I fit offset keys to DFW's to bring them around to 107 deg. So certainly advance if you have a #2 or #3 inlet pulley, but I wouldn't advance a #4 on the std. cam. You can only advance approx. 0.5 deg. by playing with the tensioners.

[sutol 0]

You can definitely advance the standard inlet cam without sacrificing top end power, because the std. cam has enough duration to maintain top end power. If you advanced an XU10J4R cam for example, you'd severely hurt the top end.

 

I fit offset keys to DFW's to bring them around to 107 deg. So certainly advance if you have a #2 or #3 inlet pulley, but I wouldn't advance a #4 on the std. cam. You can only advance approx. 0.5 deg. by playing with the tensioners.

Thanks for the informative reply, you've saved me a lot of research

 

Fitting belt this afternoon so time for a bit of thinking in the mean time.

[Anthony 1,003]

As per Peter's reply, certainly in my experience fitting an otherwise standard 1.9 Mi16 with a #4 pulley rather than a #2 pulley on the inlet (thus advancing it) gives a noticeable increase in mid-range power without drastically reducing top end.

[DrSarty 90 1 Cars]

As per Peter's reply, certainly in my experience fitting an otherwise standard 1.9 Mi16 with a #4 pulley rather than a #2 pulley on the inlet (thus advancing it) gives a noticeable increase in mid-range power without drastically reducing top end.

 

And this can also be achieved - IF you have a no2 inlet pulley - by swapping woodruff keys for one of PeterT's offset keys. Transforms a 2 into a 4 pretty much. It's equally easy to get hold of a no4 pulley instead.

[James_R 3]

to do the belt method, you want to set the the water pump side pulley slightly tighter than the front.

 

(prepares to be told he doesn't know his left from right lol)