BRP Rotax 2cyl 165hp

[Snotrekie]

I typically set my stingers up so I change ID with an adjustable valve bolt assembly. In Testing I use this to maximize my head fuel pipe combo. I adjust my heads by angle to the piston top.. I blend my fuel and test specific gravity all in the name of creating max HP in the shortest amount of time. I've been able to make more power on the pump that doesn't show up in testing. I have thousands of runs with test data to substantiate this. I don't do it anymore though

[Snotrekie]

.. so now I have to get aggressive trying to get my fricken powerhead off. kickin twice didn't do it

[FMP]

Oh that was you! LOL Those sleds must make some good power with all that compression.

[Snotrekie]

I've ran as high as 17.8 corrected but slowed down. The difference was made in the head fuel pipe combo and rear transfer the rest is typical stuff.

[Snotrekie]

I'm actually going trail riding this year how about that!! just turn the key and go

[Umassot50]

I too wish brp would make a v6 clone of their sled motor architecture. The problem becomes the bore center distance. Inorder too build a v6 with non twisted transfer ports like a sled motor you need at least a 5 inch bore center distance. The previous generation rotax sled engine had right about 5 inch bore center distance with individual cylinders. The new rotax brp mono cylinder engine is less i think. Bigger bores with good transfer port shape requires more bore center distance. And of course the sled engines have tuned pipes which greatly increase top end power at the expense of low end power. Boat engines need all the low end power. Still with exhaust power valves a sled engine architecture inspired outboard would be bad ass.

[H2OPERF]

There are ways around the problems , a flat four or six would work fine , two tripples geared together like yami and suzuki did with counter rotating cranks on the bikes. were talking race stuff not a pontoon slug... also everyone's so worried about the torque were not all drag racing. Think of how light the is thing would be with a merc #6 tiny mid all together it wouldn't weigh crap.. on a light f1 boat would be bad ass ..

[FMP]

L5:d

[powerabout]

boosted 3cyl should do it

[FMP]

Nothing smoother than a 5. Triple has over 3 times the unbalanced moment.

[Snotrekie]

Flat 4 cyl fired at 180 might do it. 2 800's coupled. Done it with 440s both 90 and 180 .. lil shot of NOS would get you over the hump

[FMP]

Just love the L5. lol

[John800]

Make it an I/O sterndrive and have room for the tuner and a cvt. I cant beleive nobody has done that! What could possibly go wrong?

[H2OPERF]

Ok I give I will take the 5 cylinder etec 400Hp version where do I write the check. LOL...what s up with 5 cyls is there some other majic to the tuning...5X72 does equal perfect 360 no overlap... Chrysler comes to mind..Dave

[FMP]

Those big hp# are with a crazy pipe and expansion chamber. Yup two stroke 15234 for lowest primary moment but needs tuned pair ex tuning for decent power. It would do a good HP but not 400 without pipes??? Once was Chryco, USMarine , Merc .No Cheques , strictly cash.