"I also have a D&D Exhaust ( certified 7.5 hp) and use Royal Purple Race 41 ( 3 HP) in the engine as well as RP through out."

Are you riding an R1100S? If so, I find your claim of ten horsepower gained simply between a D&D exhaust and Royal Purple oil unbelievable. HP gains like that are very unlikely on the S.

And I don't find a D&D exhaust for the S here... D&D Exhaust

D&D
 

San Jose, Dino'd many many exausts, the D&D made the most power 7 to 8 HP. I bought mine from the BMW shop in Dallas Tx. Best sound too from the many I have heard at rallies etc. SWAAAEEEEET!

Royal Purple ( in fact most quality synthetics make 1 or 2 hp) makes about 3 to 4% more power. I ride a very strong 99GS.

Not the same engine configuration at all, exhaust makes minimal difference on the S. The factory S exhaust is extremely efficient. Different cams also, higher compression in the S, among other things. Royal purple makes zero difference, true here, true on the Harley board also. Regardless of what their marketing wants you to believe.

You should clarify your ride when posting on an R1100S board about HP and/or torque gains, it might confuse newbies.

excuse me
 

ROTFLMAO,

I was only giving you the info from the winner last years boxer cup. http://bikes.sjbmw.com/docs/home/news.asp?n_id=5

DID you win? ... I have done what he did but for a GS.

LOL your S will have more acceleration if you put some GS intakes on it... ! ( you will loose a bit at the top end...but how often does one actually get to go the extra 4 or so MPH in the USA....

it might cornfuse olebies too, i was almost outa control till i saw the lunacy in this.

Re: VALVE ADJ ..&..
 

You gotta explain this one to me, how does less vavle lift, and shorter duration lead to more horsepower?

Sticking to facts and not resorting to insults or personal attacks, like most good Pelican members do on this board, I can see why it might have been very easy to gain a few HP off your bike versus an S.

From my 1999 BMW brochure:

R1100S 11.3:1 comp - hp 98 @ 7,500 rpm - torque 70 ft-lbs @ 5,750


R1100GS 10.3:1 comp - hp 80 @ 6,750 - torque 70 ft-lbs @ 5,250

Again, trying not to be redundant, you are misleading any R1100S newbies by stating on an S board, without identifying your bike, any HP or torque gains. It is not an "apples to apples" comparison.

If you had the cumulative knowledge regarding the R1100S bike that many on this board have (accumulating through the years, and since the bikes inception), you would realize that the Germans did a significant amount of engineering on the exhaust system alone, in addition to tweeking other engine parts too, in order to achieve the performance level of the S within their desired range, and at the time advertised as the most powerful boxer ever.

the S is not a GS, the engines are tuned differently, have different performance objectives also. I would submit that its far easier to achieve gains on that GS than on any S out there. But don't take my word for it. A serious reading on this board will confirm this.

You were, but we didn't have the heart to tell you! :eek:

you can buy mercury carb sticks for less than $40....

Yeah, but I can build one for less than $4.

I forgot.... BMW owners are cheap..... :D

Damn straight we cheap.

And I can argue its more accurate. Since ATF is less dense than mercury, the change is level is greater in the ATF monameter than the mercury one for any given differential pressure. http://www.pelicanparts.com/support/smileys/smi14.gif

Acid...

I've seen your garage, and all the stuff you swap, change, and mess around with. The valves will be no problem for you! Email me if you need phone assistance. But if you read those 3 documents you'll have no trouble.

Man-o-meter, just sounds so gay!

(not that theres anything wrong with that!)

Hey, you were the one talking about tossing salads in Telluride over in the running thread.

Not that there's anything wrong with that.

Re: Re: VALVE ADJ ..&..
 

Me too. Doesn't make sense. A loose valve may be a "happy valve" but it doesn't open as far and as soon.

- Mark

I've done dynos and roll ones. Tighter valves most always give more power.

Lower lift and duration are not strategies for making more power on a properly set up motor. Now, if a motor is hosed and has too much overlap, then you might make a bit more power with looser valves. Normally they just net someone a smoother idle.

Now, there might be a universe where purple snakeoil and lose valves give real power increases, but we civilians arent' allowed there yet. :)

7.5hp from exhaust on a GS is highly believeable though.
The Ztech increases the GS by well above that even.

Do they make motors with much overlap anymore? I thought that was all but a thing of the past, done away with for emmisions.

Harleys still overlap a lot. GS cams are not as high of a lift as S ones. Max increase from a aftermarket pipe on a stock S is usually minus 1.5 HP to plus 2 HP depending on the unit. Chips are the same. Very little gain in peak HP.

Royal Purple has an interesting history. My first experience was its use in large farm tractors on the peanut and cotton farms here in the south. I'm sure its a great oil that helps a lot.

I have run other S bikes top end and roll on many times and my dead bone stock 99 seems to always be right there. The new R12S which I hope to have here at the shop by the third week in November will be interesting.............but I plan to leave iot stock as well. Best,

To think that Royal Purple is the only reason Brian Parriot blew the rest of the field away at Daytona would be naive. However his bike did has some advantages of which probably very little had to do with the brand of oil he was using. As a whole there were alot of "deviations" going around the field from loose air boxe tops, to mixing fuels (BMW provided the fuel, the understanding was you were not to run anything else), to a neat little mod that would allow you to wiggle your nose and defeat the charging circuit of the bike which freed up a couple horsepower with less alternator drag, very beneficial on a Daytona type track, no so important for the rest of the races. Another popular deviation was leaving the wave washers out on the brake rotors in an effort to free up any drag, this was also a no-no. But we ran our bike that way as well as others. It is also very beneficial when you can go to the factory and assemble your own motors to be extra well balanced and "blue printed". Yes they are stock parts, but extra care and alot of money to make sure you have the best possible motor factory parts can provide always helps. And then have to have the first choice of race bikes after breaking 10 of them in is also a nice advantage.