Hi,
1972 beetle 1600 DP with the PICT 30/31 single carb.
We went from dual weber 40 mm to the single to achieve better MPG for my son.
the dual webers averaged 20 mpg...
I am assuming that the single will get him to the high 20's....of course depends on his foot...
new motor btw, reputable builder..The heads are worked a bit to reduce the compression ratio...long motor life was his rational.
Is that an achievable goal. 25-30 mpg??
Rich
as long as the carb is tuned up nicely, I don't see why not. I've gotten 20mpg out of the ghias 1600DP setup when the solex wasn't 100%.
easily, depends on driving habits quite a bit though
Depending on how he drives he should get that or better. 72 is a OLD bug? Aaaarggg.
what you lose in mileage with twin carbs, you gain in response
I could achieve 25mpg in my sp 1600 69 Beetle. I get around that using my 1.8L t4 in the same Beetle now . . . using dual dells. The long intake runner length doesn't help with the single carbs, fuel can fall out of suspension, especially on a cold day.
I doubt your mileage will go down by switching to that single though. But, how low is that compression ratio? That could easily be the cause of your lower mileage numbers. Lower CR = less efficiency.
40mm are too big for a stock engine in the first place. And that mileage is bad...probably running too rich to make up for the over-sized carbs.
My squareback got over 40 and over 25 around town. It had 32PICT's from the factory with a little head work, a recurve on the dist, a mild cam and good exhust.
It all depends on the set-up. With your cam it may be a step backwards. You should be able to get the bug to up over 30 mpg easy.
:PERMAGRIN: Joe
I have a stock 1600 in my '66 bug and have gotten 26 MPG consistently with that engine since 1976! I'm a conservative driver. . . .
Good luck,
what distributor?
if you're using the 009 a MPG gain can be had by going back to a vacuum advance type.
Ummmmm....
I usta get 16-18 mpg with my Karmann Ghia and a single barrel solex.....
It would lay rubber in 2 gears, and
Had a few mods to the carb. Carb had 2 speeds..... Idle and GOOOOOOOOOO!!!!!!!
Ken
It's possible the right foot factor played a role. I drove my son's Celica to work no problems. He gets his license, three months later the front tires are bald and the clutch is cooked.
Dual 40mm seem like a lot of air even though you choked it with venturis. Since you are going to a smaller carb you will get more mpg efficiency. Yes a motor only sucks in so much air but you can dump more fuel than needed for moderate acceleration and fuel mileage. In other words, just because you can hot rod a motor doesn't mean it needs the performance gain. An airplane mech told me that burning a 1/2 pond of fuel an hour equals 1 horsepower. I'm sure you can see that the dual 40mm would deliver more fuel per hour than the PICT. Don't expect the same low end performance or the top end too.
What are you doing with the 40mm carbs?
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