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Discussion Starter #1
I still gotta see if Tom will sell these to me but I made a simple mount for the 44s to use with pumpgas N/A.

So for example, when I want to go duning, or go to choke cherry to have fun next year. Should work good with the 840.

You can see this is basically the same manifold that I used for the blower so it has a huge common plenum. I've already tested it and it seems to rev and ldle just fine. I do need to buy some jets though as right now I only have one set.



 

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Nice. So could I do something like that with my Brute? I think Big Kev makes custom intakes for brutes.
Good news Erik all my go fast parts are in and going together tomorrow. I'll be running some of the same stuff you have on yours including cams.
 

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Discussion Starter #5
Not sure how different the frame is Randy. This manifold is made by recycling the blower intake I made for the webers. The adapter plate means it just bolts on in place of the blower. You just swap them out, change to gas, plug the pipes and go.

I don't know if having that huge common plenum will help or hurt but it doesn't seem to be a problem yet.

Good news on the parts.. You are running the same cams as me?
 

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I think so. AMR 4X's
 

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Discussion Starter #7
I got some experimental cams or something. Mid sized, wide lobe seperation. Boost cams basically. Also considered a top end cam as they make more power up top than a similar sized cam with tighter separation.
 

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Ok I thought they were the same. Did you need the extended rockers also? Mine did.
 

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Discussion Starter #9
Yea I got the works. There is nothing left that can be done to this motor other than a stroker... glad really. Means I can stop thinking about engine mods and just think of ways to feed it!
 

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Looky good :)

how long does it take to switch over

would be kinda neat if you could get it set up where you have your Devil carbs on the blower and then the Webers set up on another manifold so you could just lift the blower off and slap the Webers on, for playing around
 

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Discussion Starter #11
Yea that is the idea.

4 bolts to remove the blower
Use those same 4 bolts to fasten the weber manifold.
Switch out the alky to gas
Plug the pipes
dune around.

If would be quicker if they both used the same fuel but you gotta do what'cha gotta do. :)
 

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This is likely a dumb question that's answered some where on this site, but here goes. Why can't you run the blower for just dunin around?
 

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Discussion Starter #13
Just because it uses the fuel too fast. That is the only reason. It actually rides really nice, very controllable. I could plug the pipes and ride around but the tank would be empty in about a mile or so.

If I switched to gas it would last a little longer, but the engine is set up for alky so the compression is too high. I would need a greatly reduced timing map and for all that trouble, the fuel would still be gone very quickly.

It would be like Camo trying to dune around with the boost turned up.
 

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Sometimes I dune with it cranked... makes for a hairier ride. :lol:
 

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Discussion Starter #15
When I first put on the blower, back when it was only 10psi I tried to dune around on racegas. Rode very nice. That was before I knew how much fuel it was using.

The low fuel light would come on and I always knew that I had plenty of time. The light just ment that I had to remind myself to go back...

Did a few runs to the top of the hill and slowly start back... only for it to run dry. LOL

I did that a few times before I realized what was going on. :lol:
 

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Hey Metal, have you ever tried running like 30% nitro methane in there with the alky? The banshee's that beat me this year, that is how they were running.
 

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Discussion Starter #17
Chris that is always an option but I haven't tried it yet.

As for the webers. The large common plenum doesn't seems to work too good for N/A. It idles odd. You gotta crack the butterflies way too much and it tends to act like it has a vacuum leak but I sealed it all up really good.

It works, it's just seems to be the wrong direction so I am going to take that plenum off and weld a baffle in the middle. Then it will act like two separate plenums one for each cylinder and try again.
 

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nitro is rough on crank bearing.. heck, it is rough on pretty well everything internal.
 

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I didn't realize you were running it on alcohol when boosting. I turbo lot's of sleds here at my shop and we always just run race fuel. I've built lots of Yamaha 4 strokes running as high as 25lbs and ran them on 108 motor octane and had no problems. How much are you boosting?
 
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