Quote:
Originally Posted by KooL
Jeez, thats one awesome datsun
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Thanks, that's mine.
Here's a recap of how I prepared my '77 B210 for this event.
Previously the car was modified for speed and power. I used it for hillclimbs and such. I built and modified the 1397cc engine to 1608cc's complete with twin 40mm Dellortos...
It ran terrific but only got 25 mpg. OK so I needed a stock engine for economy run events.
So I removed this original 1397cc engine from my '76 B210 parts car. It sat outside in a field for the last 15 years. It needed some TLC.
I tore it down and freshened it up.
I used an '80 Datsun 210 "mpg" cylinder head with it's smaller round intake ports and small combustion chambers. This head, on the B210 block [with it's flat top pistons] yields about 10.5 to 1 compression ratio. High compression is key for improving gas mileage.
Other than the Pacesetter header and 2" mandrel bent exhaust system, the reast of the drivetrain is stock.
The big engine comes out, the little one goes in....
After bolting it all together, I fine tuned it with an Innovate LM1 wide band oxygen sensor setup. After rejetting the stock Hitachi carburetor for between 14.6 and 15.0 to 1 A/F ratio, I took the car out on a 64 mile test loop the afternoon before the big event. I topped up the fuel tank to the rim and then carefully drove a 64 mile loop. I refilled the tank [right to the rim again] and it took 1.1 gallons of gas. I was very happy to have gotten 56 mpg in this initial test! B210's sit quite high off of the ground and this brings a poor drag coefficient, so I went home that night and tried to help the poor aerodynamics. I added a makeshift front chin spoiler, clear plexiglass headlight covers, and blocked off half of the grill to reduce wind drag.
The next I morning I competed in the A.M.E.C. Economy Run event and carefully drove the 118.7 mile distance. During the post event refill it took only 1.91 gallons of fuel. This equates to
61.53 miles per gallon!
I think we have a new record for the B210/B310 chassis folks!
This was not my absolute best attempt at fuel mileage for these cars. I would have needed much more time to prepare. There are many other things I can and will try in the future but I don't want to do this with my B210 though. My plan is to take this to the next level with my '81 210 sedan instead. Then I will get into lowering the car for aerodynamics and such.
I would have loved to do something like this with my Paseo, but it is a dirt oval race car and is no longer street legal. I'll bet a Tercel could be a real contender for an economy run!
Mike
