| Author |
Message |
Steve Magnusson (91tr)
Member
Username: 91tr
Post Number: 580
Registered: 1-2001
| | Posted on Friday, March 08, 2002 - 2:31 pm: | |
Richelson -- the carbed 308 airbox flap motion logic is:
no vacuum = flap open
vacuum = flap closed
so if your vacuum line is disconneted all is OK. The only way you can have a problem with this system is if after closing the flap itself hangs up mechanically when the vacuum is removed and doesn't reopen. Since yours never closes (i.e., vacuum disconnected) -- no worries. |
Richelson (Richelson)
Member
Username: Richelson
Post Number: 530
Registered: 12-2001
| | Posted on Friday, March 08, 2002 - 12:52 pm: | |
What happens if it is stuck in the closed position. The smog pump is removed but I still have the charcoal canister and this device but I think I have a vacuum line disconnected from it. |
Steve Magnusson (91tr)
Member
Username: 91tr
Post Number: 579
Registered: 1-2001
| | Posted on Friday, March 08, 2002 - 12:16 pm: | |
Jerry -- you're right -- when working properly the airbox flap/blower/charcoal canister system has no affect on performance (however, if it gets stuck in the closed position this is a problem). |
Jim E (Jimpo1)
Member
Username: Jimpo1
Post Number: 294
Registered: 7-2001
| | Posted on Friday, March 08, 2002 - 9:08 am: | |
Edward, if you get your car back today, say hi to mine! I'm going to have to wait another week at least. |
Jerry W. (Tork1966)
Junior Member
Username: Tork1966
Post Number: 129
Registered: 7-2001
| | Posted on Friday, March 08, 2002 - 6:35 am: | |
Do the actions of the air box flap have any bearing on how the car will perform, or only for emissions? I am assuming the latter. Thanks, Jerry. |
Brian stewart (Eurocardoc)
Junior Member
Username: Eurocardoc
Post Number: 209
Registered: 11-2001
| | Posted on Friday, March 08, 2002 - 6:13 am: | |
The process of EPA emmissions involves among other things, running the car to operating temp. then leaving in a sealed room for a period of time during which those bad EPA guys collect samples of the air reading any HC contamination. That is why manufacturers went to closed crankcase breathers and close off as many openengs as possible. |
Greg Owens (Owens84qv)
Junior Member
Username: Owens84qv
Post Number: 212
Registered: 10-2001
| | Posted on Thursday, March 07, 2002 - 9:01 pm: | |
Gerrit...I was reading up from the first post and I was going to give the same suggestion. The "owners.ferrari.com" site has a lot of extremely useful information. Everyone should register! |
Gerrit Visser (Gerritv)
New member
Username: Gerritv
Post Number: 46
Registered: 6-2001
| | Posted on Thursday, March 07, 2002 - 11:41 am: | |
Hi
Join the www.owners.ferrari.com site, they have pdf versions of all owner manuals. Print it out, if you get is greasy, just replace the pages.
(The site is down at this very moment) |
Steve Magnusson (91tr)
Member
Username: 91tr
Post Number: 575
Registered: 1-2001
| | Posted on Thursday, March 07, 2002 - 10:18 am: | |
Jerry -- I too have never seen a '79 308GTB/S N.A. OM, but I think a copy (or reprint) of the '78 308GTB/S N.A. OM (150/78) would serve you very well:
http://www.ferraribooks.com/inc/pdetail?v=1&pid=206
and if you want to DIY beyond fluids get the 308GT4 WSM (110/75 I think) too:
http://www.ferraribooks.com/inc/pdetail?v=1&pid=216
Not only do they pay for themselves if you DIY, my experience is that good F tech literature goes up in value over time and is an easily resold item. Stuff for the later, complex OBDII cars starts to get a little pricey, but IMO for a DIYer with a '73~'91 F it's a no-brainer to get an OM, WSM, and SPC -- give Kurt at FerrariBooks a shout. |
Jerry W. (Tork1966)
Junior Member
Username: Tork1966
Post Number: 128
Registered: 7-2001
| | Posted on Thursday, March 07, 2002 - 6:36 am: | |
Steve, I wish I had an owner's manual but all the ones I've seen are not in English. Also thanks for the info.
Ed, Thanks for the compliment. |
Steve Magnusson (91tr)
Member
Username: 91tr
Post Number: 571
Registered: 1-2001
| | Posted on Wednesday, March 06, 2002 - 10:43 pm: | |
Jerry -- You need an Owner's Manual! The air diverter valve dumps the pressurized air from the air pump to the atmosphere to prevent overheating the cats at high RPM (>4400 RPM if I recall correctly) and low engine load (high manifold vacuum) conditions. The airbox flap is part of the fuel evaporation control system -- at engine shutoff the electrovalve switches state to put the vacuum stored in the sphere on the actuator which closes the airbox flap and the little blower fan runs for a few minutes to move the fuel vapors out of the airbox and transports them over to the charcoal canister to be temporarily absorbed/stored. |
Edward G. Salla (350hpmondial)
New member
Username: 350hpmondial
Post Number: 23
Registered: 2-2002
| | Posted on Wednesday, March 06, 2002 - 7:22 pm: | |
Jerry,
Just looked at your profile. Man, thats one pretty car. I'm partial to black. Wow, and it's carbed too. Bet it's fast. I'm going through Ferrari withdrawls, mine's in the shop @ NORWOODS, he found two clogged or blown injectors. Can't wait to get it back, hopefully friday. |
Jerry W. (Tork1966)
Junior Member
Username: Tork1966
Post Number: 127
Registered: 7-2001
| | Posted on Wednesday, March 06, 2002 - 7:08 pm: | |
I'm sorry, yes it is on my '79 308. At the risk of sounding like a dumb ass...what does the air pump diverter valve do and why did they put that air box flap mechanism on there? Thanks, Jerry. |
Steve Magnusson (91tr)
Member
Username: 91tr
Post Number: 570
Registered: 1-2001
| | Posted on Wednesday, March 06, 2002 - 4:16 pm: | |
Jerry -- give model/year/version, but it sounds like your talking about the "electrovalves" (electrically controlled pneumatic valves) that control the air pump diverter valve and the air box flap mechanism (if, as in your profile, the car is a later carbed 308). |
Jerry W. (Tork1966)
Junior Member
Username: Tork1966
Post Number: 126
Registered: 7-2001
| | Posted on Wednesday, March 06, 2002 - 4:06 pm: | |
Does anyone know the function of the two small square boxes on either side of the carbs that the vacuum lines attach to? They have a nipple sticking straight up in the air and one facing left and one facing the right side of the car. I would also like to know the routing of the vacuum hoses that attach to these because I am not sure mine is correct. Thanks in advance for any help you can give me. Jerry. |