Stage 2 cams (again) - dynos! - Page 3 - SV650.org

northwind · 14-05-06, 10:05 PM

Quote:

Originally Posted by r4ce_e3nd

I didn't do it, my tuning-guy did that and I trust him on this one... but the holes ar befor the filter

Cool... So what exactly did he do?

15-05-06, 09:07 AM

are there any negative concequences about the mod? I've heard that you will need to check the clearence of the valves more often and with a better tollerance than standard...

Quote:

Originally Posted by northwind

Quote:

Originally Posted by r4ce_e3nd

I didn't do it, my tuning-guy did that and I trust him on this one... but the holes ar befor the filter

Cool... So what exactly did he do?

he drilled wholes in the plastic that covers the filter. I don't know how many he drilled and the size, but I think 6 or 8 and diameter of 8-10mm. he also was so kind of turning alumunium pieces to raise my tank and this looks very nice (befor I used washers)

johnnyrod · 15-05-06, 09:36 AM

No reason to check clearances any more often than usual. Check the clearances after you fit the new cams, my experience (and a lot of others' too) is that the same shims did the trick.

There is a thread on www.svrider.com forums with lots of info on this. There are alos pics of the cams with timing marks, but to double-check I also worked out the marks myself by looking at the lobes.

If the carbs were right before the cam swap then they should be fine afterwards, but get a dyno run anyway, as you want to see the extra power, and confirm that there aren't any carb issues hanging around. You'll see a big difference if you're fitting the ignition advancer at the same time, it'll be a totally different bike. Both mods make it louder too.

northwind · 15-05-06, 09:50 AM

Ah, that makes sense. So it's basically similiar to the desnorkel mod... But with drilled holes instead of entierly removing the snorkel.

As far as consequences... As far as I'm aware, there aren't any as far as clearances are concerned. The higher lift and duration affect what happens when the valves are open, the clearances are most critical when the valves are closed. If the clearances were wildly out then I suppose there'd be a risk of your valves tap dancing on the cylinder heads, but not dramatically more than stock- and we're talking ridiculously bad setup here, not just "a bit out". SV heads are quite roomy

15-05-06, 09:54 AM

thanks for the advice!

which realy concerns me is the fact that it will make it louder, because I subscribed me for a trackday on our circuit Zolder and they have very tight dB-limits (max 94 dB if I remember well) and last year I had a warning with the setup I know have (with a 2nd warning you can go home

): K&n dynojet and MIVV exhaust + dB-killer. but, the fact is that I need to replace the damping-stuff of the exhaust because I noticed some darkning of the carbon-fiber and it gets louder and louder, which means the damping-stuff is burning up. maybe I will go with the stock exhaust to be safe...

I will check svrider.com too

16-05-06, 07:26 PM

got these timings from someone, maybee someone can use them, because I'm not familiar with these things:

SV 99-02
in: befor UDP 28°/after LDP 62° (lift 8.1mm)
out: befor UDP 43°/after LDP 24° (lift 6.1mm)

SV -03
in: befor UDP 33°/after LDP 66° (lift 8.7mm)
out: befor UDP 55°/after LDP 66° (lift 7.3mm)

UPD: upper dead point (I don't know the exact translation, but it's the position of the piston)
LPD: lower dead point

greets

23-07-06, 12:56 AM

ok, I've done it

I feel a real boost starting at 7-8000 rpms and those cam chain tensioners are sneaky little *******s...

soon the ignition advancer, but first I have to get the right bolt to remove the flywheel (is this the correct word?

), an M20 x 1,5 right?

I will also do a dyno-run to see the difference.

15-05-06, 09:50 AM	#24
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Ah, that makes sense. So it's basically similiar to the desnorkel mod... But with drilled holes instead of entierly removing the snorkel. As far as consequences... As far as I'm aware, there aren't any as far as clearances are concerned. The higher lift and duration affect what happens when the valves are open, the clearances are most critical when the valves are closed. If the clearances were wildly out then I suppose there'd be a risk of your valves tap dancing on the cylinder heads, but not dramatically more than stock- and we're talking ridiculously bad setup here, not just "a bit out". SV heads are quite roomy __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

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15-05-06, 09:36 AM	#23
johnnyrod Member Mega Poster Join Date: Jul 2003 Location: Doncaster, oop norf Posts: 2,128	No reason to check clearances any more often than usual. Check the clearances after you fit the new cams, my experience (and a lot of others' too) is that the same shims did the trick. There is a thread on www.svrider.com forums with lots of info on this. There are alos pics of the cams with timing marks, but to double-check I also worked out the marks myself by looking at the lobes. If the carbs were right before the cam swap then they should be fine afterwards, but get a dyno run anyway, as you want to see the extra power, and confirm that there aren't any carb issues hanging around. You'll see a big difference if you're fitting the ignition advancer at the same time, it'll be a totally different bike. Both mods make it louder too.

15-05-06, 09:54 AM	#25
r4ce_e3nd Guest Posts: n/a	thanks for the advice! which realy concerns me is the fact that it will make it louder, because I subscribed me for a trackday on our circuit Zolder and they have very tight dB-limits (max 94 dB if I remember well) and last year I had a warning with the setup I know have (with a 2nd warning you can go home ): K&n dynojet and MIVV exhaust + dB-killer. but, the fact is that I need to replace the damping-stuff of the exhaust because I noticed some darkning of the carbon-fiber and it gets louder and louder, which means the damping-stuff is burning up. maybe I will go with the stock exhaust to be safe... I will check svrider.com too

16-05-06, 07:26 PM	#26
r4ce_e3nd Guest Posts: n/a	got these timings from someone, maybee someone can use them, because I'm not familiar with these things: SV 99-02 in: befor UDP 28°/after LDP 62° (lift 8.1mm) out: befor UDP 43°/after LDP 24° (lift 6.1mm) SV -03 in: befor UDP 33°/after LDP 66° (lift 8.7mm) out: befor UDP 55°/after LDP 66° (lift 7.3mm) UPD: upper dead point (I don't know the exact translation, but it's the position of the piston) LPD: lower dead point greets

23-07-06, 12:56 AM	#27
r4ce_e3nd Guest Posts: n/a	ok, I've done it I feel a real boost starting at 7-8000 rpms and those cam chain tensioners are sneaky little *******s... soon the ignition advancer, but first I have to get the right bolt to remove the flywheel (is this the correct word? ), an M20 x 1,5 right? I will also do a dyno-run to see the difference.