My 1972 1.7L engine has just been rebuilt and bored to 1.8L. I've ripped the fuel injection off and i'm switching to carbs; I was thinking about putting on dual 40 carbs because a little more power would be nice but I don't want horrible fuel economy.
Any suggestions?

Did you change the cam during the rebuild? Otherwise, carbs will give you neither more power nor better fuel economy compared to the stock FI.

If you changed the cam, 40IDF webers are a good choice ...
Andy


PS:

I agree on the cam needing changed before the 40's will work for you. 40 is a little large for a 1.8, so you will probably have a throttle tip-in delay. Driveability will be so-so. You may be better off with baby Dells or Solex/Kadron single carbs. They will give you better throttle response and better 'round town driving.

Depends on how big your cam is and how you want to drive the car- 'round town with a mild cam (dual single barrels) or wide open with a big cam (dual dual barrels) .

You will find that everybody who responds will have their own opinion, carbs vs FI and cam discussion is one of those toppics.

Stock FI will probably give you the best power and driveability. Mixture can be adjusted at the manifold pressure sensor. (Adjustment screw is sealed with epoxy)

Tell us more about your engine build. Did you only change the top end?

Dellorto 36 DCNF with god cam
stock cam: D-Jet
if you can, bump up the compression to 8.5 or so
early 1.7 at 8.5 to 1 should be good for 86hp
or...$300 gets you a set of 96mm pistons to make a 1911cc

Well I just recently bought this car about 2 months ago; the engine was out of the car and was in horrible condition; when it was taken apart we discovered that a bearing had come loose and destroyed the end of the crank shaft....and so on; well baisically everything but the engine core itself was replaced by good used stock parts including the cam; the only difference is that the engine has been bored to a 1.8L; now I just would like to know what would be the ideal carb system???

Thank you for the suggestions

If it's all stock, you will have to choke down the 40s with some smaller venturis to get enough air-speed or go with some smaller dells instead.


Andy

36 DRLA:s work fine in original 1,7 engine. Pulling strong low rpms and soud great in higher rpms . D-jet puls little better in midrange (imho).

If it is using the stock cam, you are going to be happier with d-jet injection over carbs. The stock cam does not work very well with carbs.

Zach

Thank you for the suggestions, I think I might go with a smaller set of dual carbs like 36s;

I also need an exhaust system; I would like something a little sportier than a original, that would help the engine breathe a little better; what could be some options?

SSI heat exchangers with a Bursch exhaust is a good choice. Anything better than that will cost you real money ...

Andy