Wet Rods #830 Dry

[cacsrx1]

Bore and stroke must also be different......1000/4=250cc and 1800/6=300cc

 

[CatRpillar]

Only if you count the current LS GM V8s as the same small block introduced in the 50's. The original ws replaced in the late 90's with a MUCH updated version. Porsche flat sixes like the current GT3 became water cooled instead of air cooled in 1999. That is a pretty major redesign as well, not the same engine in either case for the time periods quoted.

I don't think there is anything wrong with the Yammi sled motors except wieght. Clearly they can still make good reliable power.

Ok, so now we're getting a bit of clarity, that is weight. So what's a reasonable clean sheet of paper design going to reduce weight by? Or, there are probably things that could be relatively easily done by Yamaha to cut the current engines weight? More magnesium covers, pork chop the crank throws, hollow camshafts, slightly smaller motor with DFI, more efficient cooling system with less coolant, etc. Boost it to make power up to around 6000 rpm and then reap the benefits of more efficient clutching. Makes up another 5 hp in losses just by that if I remember Olav Aaens rule of thumbs.

Personally, I think they could have success with, let's say, a 700cc triple turbo. Drop maybe 20#'s, keep it at 150 hp (at all altitudes). Great sound, reliable, kill everyone else at altitude, and getting within spitting range on weight overall. Is that within reasonable reach?

 

[Deep Powder Guy]

Yamaha's HO 1800cc 255 hp SC watercraft motor works for me. Even at 200 hp in a sled in an effort to shed sled weight ie: Jugs, Piston, Cam & Crank

DPG

 

[CatRpillar]

Yamaha's HO 1800cc 255 hp SC watercraft motor works for me. Even at 200 hp in a sled in an effort to shed sled weight ie: Jugs, Piston, Cam & Crank

DPG

That has to weigh a ton though, given how marine motors are tuned for sustained wide open throttle. I'd like to see it in a lake racer though!

 

[TRS]

I believe the patents owned by these two companies have made it difficult to design a new proprietary product. Better to get into bed with each other than spend countless dollars fighting patent infringements produced by a low volume 4 stroke product.

 

[stingray719]

I believe the patents owned by these two companies have made it difficult to design a new proprietary product. Better to get into bed with each other than spend countless dollars fighting patent infringements produced by a low volume 4 stroke product.

Yep, good comment. As a side note not a lot of people know the 800 in the Arctic Cat was designed by Cat and built by Suzuki.

 

[CatRpillar]

Yep, good comment. As a side note not a lot of people know the 800 in the Arctic Cat was designed by Cat and built by Suzuki.

That's just a rumour. Cat builds them in woodshed behind the gas station in TRF using old Polaris motors because there are so many scrap Poo motors that they're cheap to start with. Voodoo and black magic are used - no, not that Black Magic - because that's the only thing that can be trusted if you start with a Poo.

I heard this on the internet.

 

[Deep Powder Guy]

Unless you live in a cave I don't feel the masses out there never knew Suzuki has been building Cat motors.

DPG

 

[CatRpillar]

Yep, good comment. As a side note not a lot of people know the 800 in the Arctic Cat was designed by Cat and built by Suzuki.

Cat designed it? Maybe helped but I don't think they had the resources to do a grounds up design did they?