| Author | Message | ||
     Mcgiver |
That is the question. I have a 98 s3, with race header & muffler, race Air cleaner, & 42 Mikuni. I have sent off heads for stage 2 work, and 1250 kit. If I switch to the 536 cams how much power will I lose below 3000 rpm, or will I just not get an increase like I will above 3000 ? Or simply put how streetworthy are these cams? Thanks Brian | ||
| Crashbuell |
If it was my bike, I'd get a set of the lightning cams and use them. I put them in my cyclone along with the thunderstorm heads/pistons, a pro-series pipe, aircleaner, and ignition and its a rocket. The power really starts at around 3500 rpm and pulls hard right to about 6800 rpm and these cams are factory stuff so they are proven. I think because these are lumpier than stock XL cams (.497 lift) they should still work with your modified heads and 1250 kit. | ||
| Jeff88ix |
+1 on the Lightning cams, I had these in my 2000 Cyclone with a HSR42 and a Wileyco can, and the power was incredible, first three gears it wanted to rip your arms off, great fun Jeff | ||
| Captainkirk |
If I'm not mistaken, the S3's came with the equivalent of the the Lightning/Andrews N4 cam installed....same as the X1 | ||
| Captainkirk |
To clarify; the M2 came with the stock Sporty cam. The X1 & S3 came with the Lightning cam which is basically the Andrews N4 grind. You might check out the Andrews N8. I put these in my M2 along with the race kit and HSR42 and man, what a difference! The N8's are a true "bolt-in" cam, with no changes to valve springs, push rods or rocker arm geometry....and they WORK. Just a thought... | ||
| Pikeslayer |
Hey Captain. Did you have to re-map or retune when you went to the N8's? | ||
| Xldevil |
Hi. My 2002 european M2 came stock with the .497 cams which are not the XL Sporty cams but the so called Lightning cams.Equivalent to Andrews N4 or SE bolt on cams. I had my heads ported in 2003,used the Buell pro series race kit,a HSR 42 and was very satisfied with it.Power and torque right above 2000r/pm. Last winter I switched to 1250cc and the .536 cams and set my squish to .025 and .030. For the heads,I only changed the valve springs. The .536 need a little more revs to feel round,but from 2800r/pm my bike is pulling like hell. My conclusion,in combination with a good head job and a close set squish and the slightly higher compression of the 1250cc pistons (to maintain enough cranking pressure for a strong torque at low revs)they are worth the money. By changing to 1250cc you unshroud the valves.This will open your engine to the advantage of this higher lift cams. Ralph (Message edited by xldevil on November 01, 2007) | ||
| Rick_a |
With the proper compression ratio you lose nothing...that said you really shouldn't ride a Buell under 3000RPM except for first gear. I did an Andrews N9 cam (big duration and lots of overlap) and actually gained a bit of power down low with a small increase of compression ratio (10:1 to around 10.5:1). Granted, it wasn't as smooth off the bottom, but still better than it was. The new .575 cams match the .536 everywhere power-wise but beat 'em on top. | ||
| Blake |
Thanks for sharing your experience and observations. Very interesting stuff for sure. The .536 cams seem to have pretty much become the standard for durable enhanced performance street Buells using the Thunderstorm heads. They seem to offer the best compromise for the widest possible power-band that allows good top-end/high-revving performance too. | ||
| Xldevil |
that said you really shouldn't ride a Buell under 3000RPM except for first gear. Why? Actually I always do for the first 20-30Kms warm up,while riding in town or commuting. Got a lot of torque down there.  This one was done with the stock .497 cams Ralph (Message edited by xldevil on November 01, 2007) | ||
| Gohot |
CrashBuell, you mentiom the ignition upgrade? On My carbed M2 98 is there an application? | ||
| Blake |
Yes, there is a race ignition module that has a more aggressive timing curve at the top end. Or you can go with an aftermarket equivalent like the appropriate Dyna2000 model. Truth be told though, it won't make much difference, just a few degrees of ignition advance is all the difference. You can see dyno testing results in the dyno text topic that show both stock and race module results. | ||
| Crashbuell |
Hey, I believe that the M2 comes with bolt in Screamin' Eagle cams. Mike (a tech who is specialized in Buell) at the local shop told me the specifics but I can't remember the specs or the part number to it. As far as the ignition goes, the Buell Pro Series piece lets you run it hard right to the rev limiter and the stock one starts slowly peeling power off until you "nudge" the limiter. It's really all on how you are going to ride it. If you are going to wring it out everytime that you take it out, buy the Pro Series ignition, if you are an occasional hot-rodder, then you may not need it. The stock ignition box isn't that bad. | ||
| Panic |
"With the proper compression ratio you lose nothing" Not true - increasing the static CR will get back some of the reduced cranking pressure lost when closing the intake valve later, but there is always power missing. More: read my article: http://victorylibrary.com/tech/cam.htm | ||
| Xldevil |
If one would use the 1250cc kit,remember its increased static CR of 10.5:1,without the longer duration .536cams,won´t the cranking pressure get to high and won´t the engine be prone to pinging or unwanted detonations? Just a question of interest to the experts or about your own experiences. Ralph (Message edited by Xldevil on November 06, 2008) |
