4 bbl carb 1608 Spider

[htchevyii]

Man, that 4bbl must suck some fuel to require a 20 gal tank. Must be a Holley 390cfm? I wonder how it runs?
http://cgi.ebay.com/ebaymotors/Fiat-197 ... sQ5fTrucks

[So Cal Mark]

I've experimented with a 4bbl intake, boy did that thing rev quickly

[sptcoupe]

DEnise Burchette ran a 4 BBL on her 1608 for a while, but she had all the other tweaks on it (cams, HC, header,etc). Denise - can you comment?

[MNspiderman]

If I am not mistaken this guy simply took a 4bbl to a 2bbl adaptor and installed it upside down. Note the skinny base on the end of the intake that you can hardly see. If that were an aftermarked or custom intake, you'd see a large square base to match up to the base of the holley like on any V8 intake. And on the other hand A 390 cfm holley is ideal for 4 bangers, I had a few vehicles with them. Offenhouser used to make intakes for these carbs on 4 bangers. but that was way in the past. I often thought about chopping off the fiat runners and alumiwelding on an adaptor plate. I even had one on my 140 cid pinto engine and it would rev quick, it was reliable and you would not want to miss a gear with the pedal to the metal (or rust). I miss that old experimental junk i had, now i look back and it was so much fun.

[baltobernie]

A twenty-gallon tank? Doesn't the seller know that Medical Marijuana is legal in California?

How in the world does he get the hood closed with that thing? Can't possibly have room for an air filter

An you guys were joning on my 38 synchro Weber'd 1800! Ha!

[bwilson27]

It looks like either the vin was ground off or it was 'shopped.

[So Cal Mark]

I have a couple of customer cars I've installed the synchro 38 Webers on, and those cars rock

[manoa matt]

Has anyone put a weber 40 DCNF (synchro) on a stock 1800 manifold with good results? I have both the manifold and the carb, and can easily make an adapter/spacer to fit the carb on the intake.

I've heard guys using this setup for racing, but I wonder how driveable it would be for daily use. I had one guy tell me that a single 40 DCNF can produce as much HP if not slightly more than a dual carb setup.

I imagine the carb would just dump gas and bog down. You would need to be carefull with the pedal starting out, but once the revs got up it should take off like a rocket.

[sptcoupe]

I've run both snchro and dual 40 DCNFs, and like any carb conversion, how they end up performing depends on what else you do in the way of performance mods. With cams, big vlaves, header, etc, they can be really great set ups for street use, and you can get some great HP increases.

Just be aware that if you put a DCNF on a motor that is mounted in line (i.e, the 124s), you will have a problem in moderate to hard left turns, as the gas pick up in the carb will be uncovered and the engine will momentarily stumble, sometimes pretty badly, depending on how many lateral Gs you are generating. Not fun, but I learned to live with it, and enjoyed the DCNFs anyway. The way the DCNF gas pick up is located it is best suited for transversley mounted engines (e.g., the Ferrari 308s, or X/19).

I suspect a synchro 38 would work well in an otherwise stock motor, if properly jetted. Mark, were the motors you put them on stock? Come to think of it, I may still have the 40 synchro and the manifold I ran on an 1800, in a 131.

[So Cal Mark]

the motors I put the 38s on have higher compression, mild cams and my exhaust systems

[baltobernie]

That's pretty much what I've got Mark; 1800cc, 10:1, both 80/40's, decent exhaust (but not your great setup). I've had to go with Miller's adjustable gears, despite what IAP promised, as one cam was 8-9° off. Maybe not fair to blame IAP, as I've not owned the engine from new, and don't know if the head or boxes have been reworked. Don't know if this small discrepancy was enough to warrant the gears cost, but I'd like to give the engine the opportunity to shine.

Anyway, the 38DGS (manual choke, the electric or water version will not fit) has been an intensive, expensive PITA to get running correctly, but I think I'm almost there. Will post results after my "final" visit to the dyno next week, but she's running real strong, with a good 800 RPM idle.

[So Cal Mark]

we've also put Jasons' adjustable gears on these motors, but I've been using the 38DGS with electric choke. Why couldn't you make it fit?

[baltobernie]

No room. The manual choke barely clears the exhaust cam housing. The white electric module struck this housing. Maybe if I tried mounting it above? Anyway, the car originally had a manual choke, so what the heck, it's only used for the first thirty seconds anyway.

[So Cal Mark]

we mounted the carbs the opposite way, with the choke facing away from the motor

[baltobernie]

Well that arrangement sure would have saved my knuckles! And I can see how that would be an easier install with the linkage facing the OEM bellcrank. But doesn't the float bowl in the rear cause problems stalling under braking?