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I believe and others will prove me wrong I am sure, if you have to advance or retard the cams you are using the wrong cams. That is my pennies worth.
Why?
Every engine combination is different and you also have production tollerences to consider. To get it right you really need a dyno and some serious "trial and error".
On a std or near std engine with std cams it doesn't make much of a difference, but on a 600hp engine with hotter cams it's easy to gain / loose 50hp with right / wrong cam adjustment
Did it stop raining yet, so you can give here some good workout?
It did :mischeif:
Took the car out a few hours ago and TBH it didnt feel very good.
Dont worry just yet because i had quite a few problems, to start with i kept bouncing off the rev limiter because i decided to lower it a bit. Then the bloody gear linkage middle slide in joint decided to pull apart when i pulled on the gear stick a bit too hard. This then dragged along the road for about half a mile until i could stop, this bent the gear change rod 180 back on itself.
I did manage to get home in 1st gear and bend the rod straight again but never managed to take it back out again.
Why?
Every engine combination is different and you also have production tollerences to consider. To get it right you really need a dyno and some serious "trial and error".
On a std or near std engine with std cams it doesn't make much of a difference, but on a 600hp engine with hotter cams it's easy to gain / loose 50hp with right / wrong cam adjustment
Totally agree here - I see the adjustable pulley as a means to compensate for tolerances and for things like when the head is skimmed.
The other advantage of adjustable cams is for situations like this where (if you have enough patience) different setting can be tried to adjust the engines power delivery to taste for any particular setup (comp ratio, turbo sizing etc etc).
But to Aelreds point I agree in that I don't think the adjustable cam pulley is the answer to all valve timing related issues either - it can fine adjust around the basic profile of the camshaft, but if the wrong cam is fitted then no amount of adjustment on the pulley will fix things...
But to Aelreds point I agree in that I don't think the adjustable cam pulley is the answer to all valve timing related issues either - it can fine adjust around the basic profile of the camshaft, but if the wrong cam is fitted then no amount of adjustment on the pulley will fix things...
Nicely put.
Cheers'en, AndyC
1994 ABY Coupe - Projekt Alpinweiss
Yonks ago, somebody posted a table of all the know camshaft specs but I cannot find it. It would be useful data...
ANybody else feel like a searchfest ?
Tis a good reminder too that the RS2 has that funky camwheel to skew the ABY inlet cam timing, but of course it has much higher lift on the exhaust cam.
Must admit - I would like to play with this a little bit to see what (if any) gains can be quantified on an anotherwise stock engine/turbo config - may need ECU tweaks to play along with them. I think an adjustable cam pulley and an adjustable cog on the exhaust cam could be a good combination to try with ABY inlet cam and 7A exhaust cam.
Tis a good reminder too that the RS2 has that funky camwheel to skew the ABY inlet cam timing, but of course it has much higher lift on the exhaust cam.
Originally posted by aelred
I believe and others will prove me wrong I am sure, if you have to advance or retard the cams you are using the wrong cams. That is my pennies worth.
But to Aelreds point I agree in that I don't think the adjustable cam pulley is the answer to all valve timing related issues either - it can fine adjust around the basic profile of the camshaft, but if the wrong cam is fitted then no amount of adjustment on the pulley will fix things...
Thanks Paul, really this is what I was trying to say and I did not explained myself properly.
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(except a towball)
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