Camshaft timing adjustment

azli · Post by **azli** » 06 Sep 2005, 04:31

Can we play with the cam timing to achieve more power .If so how to do it .tq

adrianpike · Post by **adrianpike** » 06 Sep 2005, 10:45

Yes.
To actually get more peak power, you'll need some dyno time to adjust, measure, adjust, measure, as any power gain won't be signifigant enough for the ass-dyno to measure.

You can also adjust cam timing to move the powerband around in the rev range, within reason. I'm running a K cam a few degrees in advance to move the powerband down a bit, as I'm not super anxious to wind my tired B21 past 6K anymore.

You can get an adjustable cam gear from iPD, and Dale Walmsley (245gti on turbobricks) sells semi-adjustable gears that give you advance or retard in set increments. If you lurk around for a while, a used MVP or iPD one might become available.

Guest · Post by **Guest** » 07 Sep 2005, 05:12

Thank you for the great reply...it does clear my doubt. Actually I have a 850 and trying to get a max power band in the lower to mid range area. I'm not into the 5000 to 6000rpm's.
Just to confirm do I need to invrease both cam timing or just the intake.I've tried the intake bout 3deg adv and exhaust 0 quite good but at 5000rpm the engine is like a rocket to 6500rpm.
would appreciate much your help on this and small hop ups or tuning just to have the extra power.
Thank you again

azli · Post by **azli** » 11 Oct 2005, 10:34

anyone canhelp me on my 1995-96 850 non turbo cam adjustment , plss

azli · Post by **azli** » 31 Oct 2005, 07:48

any one knows how to squeeze the extra power from camshaft timing adjustment for my 850NA 1996 engine....pls help many thanks

adrianpike · Post by **adrianpike** » 06 Nov 2005, 23:04

azli wrote:any one knows how to squeeze the extra power from camshaft timing adjustment for my 850NA 1996 engine....pls help many thanks

Step by step:
-Strap it to a dyno.
-Make a baseline run.
-Adjust cams.
-Run, record power output.
-Repeat.

If you want to do it the ghetto way, just adjust and use the butt-dyno.

Post by **MadeInJapan** » 26 Nov 2005, 09:40

Slater over on VolvoSpeed has made a "wheel" that you slip over the cam shaft to set the timing. You might want to check it out: http://volvospeed.com/vs_forum/index.ph ... opic=33956
Regards,
MIJ

azli · Post by **azli** » 11 Dec 2005, 05:44

gee thans a alot.... very sorry my pc got a bad virus..so now got a new one a toshiba lap...wow...
Just gone thru the web site ...where do I get one??
can you just tell me for a NA what's the optimum setting please ?
I also did tweak on the distributor timing , we have it advanve by 6 degrees ...you can actually hear a bit of a knock when you fire up the engine..any other suggestions guys?
Just to check whats the top speed of the 850-NA mine I tried up to 197...

Thanks in advance

White850Turbo · Post by **White850Turbo** » 11 Dec 2005, 06:03

azli wrote:gee thans a alot.... very sorry my pc got a bad virus..so now got a new one a toshiba lap...wow...
Just gone thru the web site ...where do I get one??
can you just tell me for a NA what's the optimum setting please ?
I also did tweak on the distributor timing , we have it advanve by 6 degrees ...you can actually hear a bit of a knock when you fire up the engine..any other suggestions guys?
Just to check whats the top speed of the 850-NA mine I tried up to 197...

Thanks in advance

You have to PM Slater on VS. He sends detailed instructions along with optimal settings for both the turbo and N/A engines. What octane fuel are you running? You shouldn't be knocking; detonation kills rods on these cars.

azli · Post by **azli** » 11 Dec 2005, 08:58

ok I'm using 97ron
just to check do we adv the intake more than the exhaust or vice-versa ...any suggestions...sorry I can't get thru Slater