| Author | Message | ||
| Grant Gilmour (Grantgilmour)
New member Username: Grantgilmour Post Number: 42 Registered: 8-2002 |
Thanks to Jeff Howe at Ferrari UK for finding two carbs me. We replaced the two worst carbs and have sent them off to Pierce Manifold for a rebuild. Replacing the two bad carbs made a huge difference to the low RPM performance. Can hardly wait to get the rebuilt carbs installed and properly tune the carbs. | ||
| '75 308 GT4 (Peter)
Advanced Member Username: Peter Post Number: 2727 Registered: 12-2000 |
I'd look at it this way JRV: The replica carbs keep the essense of originality - the look, the sound, the performance, etc... A-Okay in my books and not deserving of a dent in the price. Computer-controlled ignition and F.I. makes life easier and is trick too... Okay in my books too but less-so than the above. JMHO  In the end, bush the shafts of the originals and everybody is happy  | ||
| Bill Steele (Glassman)
Junior Member Username: Glassman Post Number: 211 Registered: 4-2002 |
Sounds like a job for Pierce Manifold, and they do the work for an OK price. | ||
| JRV (Jrvall)
Intermediate Member Username: Jrvall Post Number: 1408 Registered: 11-2002 |
>>Couldn't these replicas be used on the Boxer (with the necessary changes to suit the specs of course)?<< I suppose they could. Ferraris that are modified with parts other than exhausts are generally viewed as less desirable in the big scheme of things, so the repli-carbs could seriously affect resale value. Then of course one must ask themselves, if they are going to install aftermarket parts, that could affect resale desirability & price, why bother with repli-carbs when Individual Throttle Body Fuel Injection exists that will bolt on and propel the entire intake/fuel managemant system into the modern era and have a shot at increasing resale value at the same time. | ||
| '75 308 GT4 (Peter)
Advanced Member Username: Peter Post Number: 2722 Registered: 12-2000 |
Couldn't these replicas be used on the Boxer (with the necessary changes to suit the specs of course)? | ||
| JRV (Jrvall)
Intermediate Member Username: Jrvall Post Number: 1403 Registered: 11-2002 |
>>Doesn't one of the Porsche parts-suppliers (I can't remember their name) make replicas of IF3C's (since it was - and still is - a popular application)?<< Peter, yes PMO makes Repli-Carbs...but I haven't seen or heard of "new" 40IDA-F's, etc. in 5-8 yrs. (maybe 10yrs), and even good used ones are worth $500 or more each. So new ones would be a great investment in the engines performance future as the webers do eventually wear out or wear down and need extensive resusitation. | ||
| '75 308 GT4 (Peter)
Advanced Member Username: Peter Post Number: 2718 Registered: 12-2000 |
JRV: "...I'd be surprised if you could find new carbs...if you could they would be well worth the extra money..." Doesn't one of the Porsche parts-suppliers (I can't remember their name) make replicas of IF3C's (since it was - and still is - a popular application)? | ||
| JRV (Jrvall)
Intermediate Member Username: Jrvall Post Number: 1392 Registered: 11-2002 |
>>we can try and purchase new carbs at more like a $1000 per unit. << I'd be surprised if you could find new carns...if you could they would be well worth the extra money. $700 ea. sounds way to much to rebush the shafts. I've done many for less. | ||
| Grant Gilmour (Grantgilmour)
New member Username: Grantgilmour Post Number: 40 Registered: 8-2002 |
Hi Frank, I'm also leaning toward the new bushings as well. Apparently on some carbs they can actually insert a bearing which would be better yet. The 365 carb modification was necessary since gasoline was pooling in the carb when the throttle was closed, like at a traffic light. Then when the person drove away he would get a backfire up through the air filter and occasionally an engine fire. A problem on the early Lambos as well. Corrected on all 512BB's. Grant | ||
| Frank R. Masiarz (Fmasiarz)
New member Username: Fmasiarz Post Number: 11 Registered: 9-2002 |
Hi........ Think this is a common problem in carburetors which feature the rotation of steel shafts in aluminum bores. Air leaks past the shafts and creates havoc with mixture control. The best "fix" is the installation of steel or brass bushings. If you purchase new or used 40IF3C carburetors, they will eventually develop the problem and you will be faced with the same choice. I would have the bores drilled out and have the bushings pressed into place. Should be the last time you must worry about it. The Ferrari workshop/repair manual describes a carburetor modification for the 365 which is not mentioned for the 512: 1.5 millimeter "breather" holes drilled at a 45 degree angle in the top surface. Each carburetor so modified should be marked with a green paint spot ! Frank.........23005 www.masiarz.net/bb_resource | ||
| Grant Gilmour (Grantgilmour)
New member Username: Grantgilmour Post Number: 39 Registered: 8-2002 |
Steve, looks like they are a weber 40IF3CI. | ||
| Steve Magnusson (91tr)
Intermediate Member Username: 91tr Post Number: 1749 Registered: 1-2001 |
Grant -- What type Webers on your BB512? | ||
| Grant Gilmour (Grantgilmour)
New member Username: Grantgilmour Post Number: 38 Registered: 8-2002 |
The thottle shafts on all four of my weber carbs are now so worn that the carbs can not be properly adjusted. This makes the car run like crap under 3000 RPM. The mechanic has a weber expert in California who can rebuild and fix the carbs for $700 a pop or we can try and purchase new carbs at more like a $1000 per unit. Any suggestions on which is the best route? Thanks in advance. Grant |