Carb questions

Anybody know what would be the right size venturas ,main jets etc for 40 Webers or Delortto carbs on a 1600cc engine, 1.25 ratio rockers, stock heads. header with dual magaflo mufflers, electric ignition, 009 dist. It's got Dual 34 webers on it know....I'm looking to get a little more out of this little engine. Any advice would be appreciated! Mike

If I'm not mistaken 30 mm to 32 mm venturis sound about right for a 1600 cc.

Try this as a resource:
http://www.racecar.co.uk/dellorto/carcarburettors/drla.htm

shoptalkforums.com---good info, tons!

Very Nice exhaust system!!!!!!!!!!!!!!!11

I'm with Gabriel on this one!
Is this system compatible with 1 1/2" heater boxes? If so, where do I get one? The issue of performance exhaust is my current "nut" to crack.
Thanks, Ernie

Ernie, I got this car out of California about 2 years ago ....the exhaust system was already on it. If you can, you might show a picture of it to Kirk over at Vintage Speedsters. He may know where it came from. It might have been special ordered and he may have put it on himself,.....I really don't know ....it's just a guess! mike

Is anybody running double barrel 36 or 40 Delorttos or 40 webers on their 1600 or 1641 engine? If so....how does it perform? thanks, Michael

I have Dells. They're 45s, but pretty much the same thing from what I can tell. The tiny little idle jets get clogged really easily, and they ice up if you don't add de-icer to your fuel.
The second and third stages work like champs.
I think they're clogging so often on me (once a day or so) because of the quickie job I did of cleaning my fuel line after the build; clean fuel lines and warm weather, they'll probably be the cat's meow.

Michael; 36 Dells with 30 mm venturis are perfect for a 1600 cc.

Ricardo, Thanks for the info and advice! Michael

Performance?

Michael

I had Weber 40 idf's on my old 1600cc with 28 venturis (stock from the factory) and had no problems. The engine was stock too(around 65hp) so I wasn't expecting much,but the carbs did their job. One thing I can tell you for sure,it was a very reliable combo.I use the same carbs on my 1915cc.

Lambros; for a 1915 cc you need larger venturis (such as 34's). Larger venturis will increase your top rpm's but of course that's dictated by how well your heads flow (size of your valves, if they're ported or not and the size of your exhaust).