| Author | Message | ||
| Russ Turner (Snj5)
Member Username: Snj5 Post Number: 643 Registered: 2-2003 |
Thanks again everyone. Will begin putzing around with distributors and cams after enjoying it the way it is for a while. Let's just say I'm not worried about taking a carb'd hot rod Mondial 3.2 to the Cavallino Classic... I've got their build sheet right here...  best to all! Russ | ||
| Mike Procopio (Pupz308)
Member Username: Pupz308 Post Number: 598 Registered: 10-2002 |
BTW. Russ, you make carbs cool again . I, too, ease on the throttle at lower RPMS before stomping on it. Always two to three pumps before starting in the morning, and then usually I have to tap/feather the throttle a bit for 10 seconds or so before things smooth out. Also, I've always gotten light popping on deceleration. Just light pops, though--I've come to like it. My motorcycle was that way too--popping on the overrun. I've gotten used to it. There are quirks with the carbs, though, mostly centering around the transition from idle-jets-only to when the mains come in (to augment or to replace the idle jets, depending on who you talk to--I don't know the answer). There's definitely a hesitation / lean condition during this transition, around 3.5k to 4k RPMs when applying the gas lightly or moderately. If you just floor it, I think the accel pumps cover up the problem and away you go. I'm also at 5k feet elevation, so your experience may vary. I'm running stock emulsion tubes... and can't recall my jetting from memory. | ||
| Mike Procopio (Pupz308)
Member Username: Pupz308 Post Number: 597 Registered: 10-2002 |
I, too, use the "knurled" nuts purchased reasonably from Ferrari UK. Don't forget the washers. Also, these things can and do fall off. Make sure they're TIGHT! | ||
| Alan Leach (Speedy308)
Member Username: Speedy308 Post Number: 304 Registered: 12-2002 |
Hey, thanks Dr. Barry! Mine rattled off, and I used metric acorn nuts, painted black. Wingnuts will definately cost you points at the Cavallino Classic! | ||
| dave handa (Davehanda)
Intermediate Member Username: Davehanda Post Number: 2125 Registered: 5-2001 |
I'm with Barry, not a fan of "wingnuts" of either variety... :-) | ||
| Philip Airey (Pma1010)
Member Username: Pma1010 Post Number: 485 Registered: 7-2002 |
Russ I am glad you are having fun with it. Make the most of it as at this time of year, every day before the winter hibernation/project list is a plus. Starting is the same. I usually give it a couple of pushes on the loud pedal before cranking and have never used the choke. I tend to roll on the gas at lower rpms, stomp on it and it tends to fall on its face below 2500 to 3000 rpm. Above that it pulls strongly. Goes through the redline strongly. People that have driven both my 308 and a 328 indicate it seems to have a bit more to it than a 328. Encouraging but we'll see what happens after further carb changes (below). Tubi produces some pops and bangs and usually some pretty good sized flames on big heel toe decel/downshifts. Always a "crowd pleaser" at track days. Have it pretty much back together from the WP stuff. Full of coolant and no leaks. Fuel test next (had a tank resealed, replaced all the hoses). Will put the 36 venturis back in this weekend, rejet it (60/155/185/F36) and see how it runs. I know I'll lose out below 3500 but gain from 5000 - 6000 on up. I have ordered a WB AF meter which ought to enable some science to be added to my guesswork. At least now I have a collection of jets to change it out as needed. Keep you posted. | ||
| Barry Wolinsky (308gtb)
Member Username: 308gtb Post Number: 718 Registered: 2-2002 |
And Russ, order the airbox knurled nuts (part #104550) from Ferrari UK to replace the wing nuts. They have them listed in stock and are inexpensive.  Barry | ||
| Barry Wolinsky (308gtb)
Member Username: 308gtb Post Number: 717 Registered: 2-2002 |
Russ, I start mine pretty much the same way. I wait ~15-20 seconds until I hear the fuel hit the carbs before I depress the pedal twice. It's time for you to download the 308 carb Owner's Manual from Steve's Ferrari Shrine http://ferrari.jenkins.org/ for a full list of starting procedures; cold start, hot start, >60 and <60 degrees. I never use the choke. It's nice to see you're enjoying your Mondial in this new way. Barry | ||
| Paul Sloan (Sloan83qv)
Member Username: Sloan83qv Post Number: 676 Registered: 3-2001 |
I am so very envious but I will get there. It looks great! | ||
| Russ Turner (Snj5)
Member Username: Snj5 Post Number: 638 Registered: 2-2003 |
After an extended drive in the hellish and heavenly conditions that were DC today, here are the more detailed impressions of the finished conversion. Would love to hear from carb 308 guys and Philip Airey (308 with P-6s) if these characteristics are similar. Starting is really different as you don't start it like Kjet. Since I do not use the starting enrichment (choke), you hit the pedal twice (a no-no with FI), turn the key and varoom. A bit of throttle feathering needed when initially cold, but does not have that old plumbing sound the Kjet had starting from cold. Settles down to a purr at 950 rpm. Once warm, no problem holding the A/C. Drive off is about the same as stock, and I never felt any strong pull under 2500 with either. The FI used to start picking up and would build fairly linearly from about 2800 in a steady smooth onward push like a relentless train up to the redline in every gear. The carbureted engine after 3200 surges and builds noticibly faster as the revs increase and the needle wildly races to the redline over 5000. So, the flow seems to improve with rpm. Kind of cammy, but not really a noticable transition. Yepper, folks, it does pop a very little on decel. Was able to drive in stop and go (hey, DC beltway at 4:30) and was tractable in the 2000 - 3800 range without stumbling exactly smooth as the FI, but may be a very little less umph but not sure. The carb engine may be a hair down on low end torque compared but hard to tell - certainly as smooth (surprise to me). It definitely responds to the throttle better (duh) and goes faster faster at higher rpm. I am expecting fuel consumption to rise with the carbs, but the way I drive it was always bad even with the FI. Sound is way better. Engine looks neater. Again, the mech said he drove it side by side to a 308 GTS qv and the Mondial carb 3.2 was much faster. Later, I'm going to try a little more advance bringing in 34-36 degreees by 3400 rpm. There is a chassis dyno nearby so will get a graph in a few weeks. Thanks again to Philip and everybody that helped Russ  |