so i just bought the weber off a member here on the club that was origianly from rotary shack that claimed 40 mpg :] i don't have it on yet i did manage to get it running. but i need to make me a throttle cable bracket to run it. :[ but i will keep posted and tell if it realy gives me the 40 mpg on hwy !

is anyone else running this and have any tips on the bracket or any other info

thanks shane

 

Sounds good, but the laws of physics say otherwise.

Let us know what you actually get.

And even 30 mpg would be great for a 12A.

But way more fun than a Prius.

 

I did 33 once, 30 on a more regular basis, with a regular ol' Nikki.

Proper ignition timing and fuel conditioning.

Fuel economy went down when I went to EFI 13Bs but I'm getting a steady 25ish MPG with the bridge port, up to 28-29mpg when it's really hot out. (Engine gets best MPG with coolant temps in the 190-200f range, but it doesn't run that hot on the highway unless it's around 95-100F)

 

if i want a MPG, i will use my DD honda. but for fun, rotary it is as shown in the attached.

 

Saying tuned ... my wife dailys her GSL better milage would be nice

 

Awe man you guys make me just wanna keep my niki on mabye i just need to tune it properly getting 20 mpg as a dd breaks my bank .

 

Got it running its so smal but the niki is on for nowl

 

Why not both?

If you get 25mpg instead of 20mpg, then you get 25% more driving time per dollar. That equals more fun.

 

Oh ya i mean this has been my only car ever and. I love them ill prob be rotary for life even if it means i have to suffer 20 mpg

 

Thats an awfully blurry picture. Id love to see some better pictures and real road testing opinions. Rotary Shack was very vague on this carb when it was new. I seem to remember an argument thread many years ago about the claims of its performance and all he could come up with is we have people that are happy with it, but no real data.

 

My iPhone is all scratched. Ill take etter pictures tomarow with my broa camera i have to do some research tomarow on how ima make this racket the. Also buy a new fuel line to reach . Ill keep it updated going to be tuneing it alot . Then once ill prob so. A full tank and see how much i can squeZe out . Im still trying to figure out if still need the omp ....

 

Gas mileage and performance are two very different things

 

Yes I know . Haha. I was close to going blow through.... I still have the parts for it but getting 10mpg on boost and risk of detnating was to risky on my only car so now im trying to et the best mpg . But if this carb doesn't work out ill just go bac to the niki

 

I get 25mpg highway with my Dell and its a heck of lot more fun than this small weber will be.
In the mountains I only get about 12 mpg, YMMV, but the fun quotient is off the charts.

 

ive found with the nikki, the idle mixture has a bigger impact on mpg than i think it should. if you set the idle mixture to optimal, vs optimal + half turn richer, it can be like 1-2 mpg

 

Thats true for a lot of carbs. Most carbs cruise mostly on the idle circuit and that influences mpg
quite a bit. Dells like that as well. If I make the idle richer it sucks more gas even at highway
cruising speed.

 

you're probably right i just made it nikki specific because i have data for that!

 

Fuel economy is performance. All performance is, is extracting the most energy out of a given amount of air and fuel. Just dumping more air and fuel in is 60s-think, if you want that then maybe you should switch to 426 Hemis which were excellent at moving air and fuel through the engine but not very efficient at burning it.

Need I remind that the pinnacle of Mazda racing was done at a race where fuel economy was the most important thing?

 

Well got it running ok realy was hard to get it stop braping. Almost feels like my mixture screw doesn't work lol. But I drove about ten miles . Was for sure way tourqy but lacked high end power .... After me messing around with it agin for a half an hour i had issues later that night back fireing and shooting huge flames .... Will update tomarow if i fix this problem . It was terrible ...

 

Still need to make a proper throttle bracket . And decide if i can remove the omp or not!

 

"ive found with the nikki, the idle mixture has a bigger impact on mpg than i think it should. if you set the idle mixture to optimal, vs optimal + half turn richer, it can be like 1-2 mpg"

Good to know, thanks J9.

 

+1 i like the Hemi, but if you take the quarter mile times of the cars they were put in new, its really only making like 300hp, which is about 50/liter, which sucks. its airplane engine territory.

the 426 Hemi SAE paper is a good read though

 

Carbs off. Niki back on. Got it running good but i don't have. A welder to custom make a bracket carb is up for sale now . ;(

 

Just use some random bits and pieces to make one. Dont give up now. I'm sure you can bend and drill some pieces of metal and come up with something.

 

Honda emblems should have a wing above them.