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Topic: Stupid power question - More, please  (Read 2402 times)

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Stupid power question - More, please

« on: November 14, 2003, 12:58:44 PM »
I was wondering which carb I could use on a stock '72 dual port engine to get the most power, and yet keep my little engine alive, cool, reliable, and happy.
I haven't done anything other than the "normal" stuff- Blue coil, electronic ignition, merged header w/ dual quiet pack, that kind of stuff.
Also, any suggestions as to how to get better handling?? I know I sound like a newbie, but it's been about 15 years since I really "worked" on a VW, and need a little help.
Many thanks, fellow Folks! :D  :laugh:

Offline vwherb

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Stupid power question - More, please

« Reply #1 on: November 27, 2003, 10:53:22 AM »
David, it's real hard to beat the 30/31 Solex. When the 34 was designed, Solex had to incorporate some EPA stuff into it and you can forget rebuilding one when it goes bad. Since the engine is stock, you don't have a need for duals or for a single large Weber or a Weber progressive. Get a 30/31 and an adapter plate and go for it.

Offline Zen

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Stupid power question - More, please

« Reply #2 on: November 28, 2003, 06:22:14 PM »
For a "stock" dual port engine, 'bout all I'd do is what you've already done, plus Herb's suggestion of going to the smaller 30-31 carb.  You will loose just a little top end power but you WILL get better all around performance.  A new one cost about $100 at most swap meets and the adapter will set you back another $10-15.  But, after you've spent months trying to get all the flat spots out of a 34 you'll think it's the best $115 you've ever spent.  A 30-31 will almost always idle and accelerate smoothly right out of the box!  Been there, done that . . . 3 or 4 times!  One thing you need to know about the new Brosol (Solex of Brazil) 30-31 is that all of the screws and the idle cut-off solenoid are going to loosen up within a couple of months.  Go ahead and tighten 'em up before you bolt it on.

There are all kinds of "bolt on horsepower" gadgets you can bolt to a stock engine (a single progressive carb or dual carbs, ratio rockers, etc.) but from a dependability standpoint it's not a real good idea to try to get more than stock horsepower from a stock engine.  The stock crankshaft is not counterweighted and when you try to make too more than stock hp it'll flex and in pretty short order the main bearing saddles will be wallowed out.

To get the illusion of more power (on the bottom end) and possibly a little better handling at the same time, you might want to look into dropping the car an inch or two (dropped spindles on front if it's a standard, Top Line Parts "Adjust-A-Struts" if it's a super, and re-index the rear torsion rods) and go to a low profile tire.  I've never done this, but I would think that should give you a stiffer sidewall for better handling and at the same time a smaller tire circumference will change your final drive ratio.  I've never went smaller than stock with a tire, but I've put some oversized tires on a Baja before and it felt like it robbed a bunch of hp from the bottom end . . . gas mileage and top speed improved though.  I'd guess that going smaller would have the opposite effect . . . less top speed and gas mileage, but better acceleration.

 :cool:

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