BMS 8.5hp WC versus DM 10hp WC

Both are running Polini Series 2 WC engines

I know the BMS has a Polini 316 3port 40cc motor with a bizeta pipe. I do not know if that model comes with the race crank or not?


what is the differances between the 2 to have the variation of 8.5hp to 10hp.

thanks

Aight,
This is basically the deal, a motor with a 40cc w/c motor, with a 14/14 carb and a bizeta pipe, tuned correctly makes about 9ish HP.

What gives you ask? I'll tell ya. Way back when (about 2-3 yrs. ago, and yes people PB have been around longer than that) DM used to use stuffed cranks and the BZM pipe, which again properly tuned, equaled about 10hp. Since then the stuffed "race" cranks have been deemed illegal for Production class. So instead of DM going backwards in their marketing, they just kept the 10HP rating and let the placebo effect kick in. The 8.5 HP BMS, ZPF, and GRC are probably modestly given that HP claim, while DM takes the other route and makes a very bold 10HP claim. If you know all the little tricks of how to tune a PB well, you can probably eek out damn near 10HP in a proddy bike, but 9HP is again a more reasonable claim.

In my own very biased opinion however, the DM's handle so well, and have such a great chassis, they are always going to be a little quicker, just look at all the bikes in the SMRRC, out of the top 10 bikes, I would say that 8 out of those 10 are DM's, and the 2 riders of the other brands (Stamas & GRC) would probably kick *** on any brand (so they don't really count )

Again, yes I know I am a bit biased, but the new DM's are just the most awsome machines we have had yet, we got 6 brand new ones on the floor, and they beckon to me everyday, but I just can't bring myself to replace my current machine (last years DM)

Hands down, bar none.

i have never heard any complaints about the BMS? i was under the impression that it was a killer machine?

I have never personally ridden a BMS, the few issues that I have heard are that it transfers a lot of vibration through to the rider, and that the foot peg location is pretty low. With that though, I'm sure you could find many "flaws" with any bike, and in the end, regardless of the bike (talkin high end bikes here) the rider is what will ultimately make the difference.

The only thing I can really say, is that I have rarely, if ever, heard or seen someone sell a DM to replace it with another brand. I have seen several people sell their DM to get a new model DM, but thats about it.

anyone ridden both the BMS and a DM?.

Currently we do not have a DM at our disposel to test.
we have
Blata 2.5 stage 3, elite 11 and elite 13
GRC
Polini GP steel, dreambike
BMS 4.2 and 8.5 and soon a BMS 14hp

Nice stable you got there, Mitch.

thanks
we just added a second 8.5hp Water cooled BMS for Christophers race bike that is identical to mine.

Were out to represent against the other brands...

I have and like them both. Hard to say which is better because it comes down to personal taste................. power is good on both and handling is good on both of them. What it comes down to is how you feel on the bike............

No way a DM handles as well as a BMS!

Vince, do you know if the engine outputs are the same between the DM and BMS?

Your right, they handle way better, thats why DM has like 40 some odd European championships to their name. (sorry, just taking a cheap jab)

But seriously most of the people that I know that have had a BMS and have ridden DM's switch to the DM's. Not trying to sound biased (although I am) but I personally, keep hearing that the main problem with the BMS bikes, is the handling. Again, not trying to bash them, I am sure they are good machines, but you now have the typical Ford / Chevy argument. (by the way Chevies suck )

Next time you guys are down or we are up you are more than welcome to give mine a whirl.

Speaking of which, you NW Minmoto guys makin it down to Stockton on the 31st??

we're not planning to come down the 31st. Too long of a trek and most of us have to work.

Honestly, I was one of the first people to race the BMS and I never had a problem with the handling. The handling was one of the better parts of the bike. Plus BMS just technically came out this year, so of course they have less championships then DM. But with the handling thing, DM's and BMS's both handle good, U guys should try the giannini R-1, it handles great. (Chevy Rules)

That pic looks like Jimmy D? I would presume that is you, and if so, I wouldn't be the first to congratulate you on lots of years of practice. It certainly has paid off. One fast dude!

I've recently got some seat time on both the DM and the BMS at the X-PLEX in Las Vegas. "I"think that both bikes handle very well. Some differences with seat height & space(more room on DM for riders with bigger butts), handlebar width & positioning(of course however it's adjusted)BMS bars can be set a little wider than DM, and foot peg position. A little lower than DM. All together I would have to say it's definitely rider preference. I remember someone saying they were way more comfortable on his old BMS than his new R-1

Have any of u guys had problems with the bodywork when cornering as my brothers would scratch along the ground when cornering. This was one of the first bikes in the country way at the start so could have been an early stage production problem? And the pegs were also too low?

The bodywork on the first ones in production was mounted very low. The bodywork may have to be remounted higher or newer bodywork bought that will fit. I have never seen the footpegs being too low, even on early prototype bikes.

I wouldn't say that the pegs are too low on the BMS. I did say that they are set lower which caused me to grind my toe and ankle sliders more on the BMS than the DM. Never had any problems with the latest style fairings though.