66E Conversion
- Thread starter te4250
- Start date
- Location
- Western NY
That sucks, I actually just rode yesterday for the first time in a month also because of stitches in my knee, you would have thought I would have made more progress lol. Have you ridden that ski at all yet? From the few videos I can dig up it looks like the 927 made decent power. There seems to be very mixed reviews on the 66e setups.
Almost 100% that situation lol, I basically lofted the two holes the size of the port on the 66e cylinder to the size of the hole in the pfp manifold, the one thing I did do was keep the path length between each cylinder and the outlet equal. Honestly once you do that, and keep the bend radii large enough to not be a crease, but also fit inside an sj hull(barely), there's not much option to how the shape turns out.
yes I have been on the ski several times before the surgery. I had problems with the carbs leaking fuel at idle and loading up the motor. I think i have that fixed now.
The motor does make great power, but i was never able to really tune due to the fuel issue
the motor shakes so violently at idle fuel dribbles out of the high speed jet,, so it loads up and is impossible to tune.
This is a problem with the 66e motors. Once you get the carbs set the motors should be like every other one out there.
- Location
- Western NY
I really wanted to put gp1300r throttle bodies on it and run a megasquirt, as that would give me programmable ignition as well. I figgured I would try to get the thing running before tackling that, but sounds like maybe its smarter to try for that from the start
- Location
- Western NY
I just figgured a custom ebox that was water tight with some waterproof panel mount connectors would work
- Location
- Western NY
I bought some gp1300 throttle bodies, haven't bought the microsquirt yet though, did a little thinking about how to go about it.
In the mean time I did get my cylinders back from powerseal:
And ran out the rest of the manifold:
In the mean time I did get my cylinders back from powerseal:
And ran out the rest of the manifold:
- Location
- Western NY
There's as much as I could really get away with, I figure I'll run it and if its too hot I'll try to do some tricky stuff to add more. I kinda think even with just that much cold water in it it should stay pretty cool with how fast aluminum transfers heat. Also I wonder on say a factory pipe maifold, how much does the water upstream of the fittings really flow anyway. I kinda feel like its stagnant, it just fills and the water pretty much goes straight from the fittings to the cylinder. We'll find out though lol
yamabro
GP Performance / Patterson Powersports
- Location
- Dickson, Tn.
I’ll take (1) manifold!!! LOL
That looks great. Good job.
That looks great. Good job.
Jcary85
Site Supporter
- Location
- Glenmoore pa
Not a whole lot of info available but u might be able to reach out to this guy. Ive thought about a mega squirt based EFI system so many time but you just add so much extra stuff to break and a FW freestyle ski just really abuses parts.
EFI Yamaha 701 SuperJet 62T Electronic Fuel Injection and Ignition Kit
Yamaha 701 SuperJet 62T Electronic Fuel Injection and Ignition Kit We have developed a bolt on Fuel Injection and ignition setup for the Yamaha 62T base engines, this setup comes as a complete bolt on setup with base maps ready to run. Setup gives the end user fine tuning adjustments to the...
www.x-h2o.com
Jcary85
Site Supporter
- Location
- Glenmoore pa
I’m really curious how the O2 situation worked. I swore I’ve read an O2 sensor isn’t accurate in a 2 stroke since there is, by design, so much unburnt fuel and it varies so greatly based on RPM.
- Location
- CT
Widebands are used commonly on turbo 2 stroke snowmobiles. The only thing they say is the sensors don't last forever with the oil and unburnt fuel.
I've seen that they get used on two stroke snowmobiles and seen some examples of people doing megasquirt projects on two strokes (usually motorcycles) that use a wideband, not a lot but there are some out there.... but I'd be more concerned about the nature of a freestyle ski is there is no steady state, it's purely quick transients, so it seems questionable to me that it would be very useful.
Similar situation with EGT's and plug reading.
But I'd love to hear about somebody doing it and how it works out.
Similar situation with EGT's and plug reading.
But I'd love to hear about somebody doing it and how it works out.
- Location
- CT
I agree. The short throttle chops and constant loading and unloading of the drivetrain certainly poses a big tuning headache. Super cool project though and nice work on the manifold. I'm excited to see how this project unfolds.
- Location
- Western NY
I was thinking I'd use alpha-n and I could basically treat it like a carburetor at first that you don't have to turn any screws on to change jets, and get the benefit of programmable ignition timing as well. I think you guys are right about skis not being the best candidate for efi, being a watercraft you wont hit nearly as many combinations of load and engine speed that you could with say a motorcycle, and that 3d tuning capability is one of the first and foremost benefits.
I did see that efi kit a while ago and checked back a couple times to see if there were any updates. Is that guy still making them? Was there ever a review of it posted? I might reach out but would be surprised if he was willing to lend too much advice if he's still trying to sell the kits.
I did see that efi kit a while ago and checked back a couple times to see if there were any updates. Is that guy still making them? Was there ever a review of it posted? I might reach out but would be surprised if he was willing to lend too much advice if he's still trying to sell the kits.
To be clear I was questioning if a wideband would be helpful, efi could have big advantages, I suspect it could respond to quick changes in throttle position better than carbs, especially BIG carbs, and no worries about dribbling from vibration, super short intake tract, those seem like potential big advantages. No idea if that will actually work in reality. If you're not familiar with x-tau accel enrichment I would be looking into that.