04-22-2008, 07:41 AM
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ReAlfisted 3/06
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Join Date: Sep 2005
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 Quote:
Originally Posted by William Langley
I knew someone would tell me that couldn't work.
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 and I thought what you said made sense
"If the actuator extends to 29mm at 175 degrees, try setting the pump gap with the dummy actuator at 29mm (if the screw will turn in far enough), and install without the shims."
That will still give me .019 at 175 degrees ( now of course there is this load business) and should kick the lever over to give me a bigger gap (faster cold idle) at a cold start. No?
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1973 GTV - bought 3/06
1969 GTV, #AR1530021 - sold 10/72
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04-22-2008, 10:11 AM
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with the Librarian
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Location: New Jersey USA
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No. Other way round. Removing the shim will decrease the gap.
As far as the load goes, the TA is a version of, say, the hydraulic clutch system. The bulb in the intake manifold is the master and the piston at the pump is the slave. If there is air in the system, the master will go full travel while the slave will not. Same with the TA; air in the system will not allow full piston travel. Hence, testing the TA under load just as it would be as installed.
Then there's the issue of what fluid was used in the rebuilt TA as different fluids expand at different rates.
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Jim
Series 1 Euro 1750 GTV
Series 2 US 1750 GTV
Series 3 Spider Veloce
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04-22-2008, 10:37 AM
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ReAlfisted 3/06
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Join Date: Sep 2005
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Off topic, anyone on this?
While chatting with Wes last night
I know it may be herisy (sp), but I know I can fiddle with my idle adjusting this screw!
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1973 GTV - bought 3/06
1969 GTV, #AR1530021 - sold 10/72
Last edited by lowmileage; 04-22-2008 at 11:23 AM.
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04-22-2008, 02:19 PM
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Registered User
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Join Date: Aug 2006
Posts: 22
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Quote:
Originally Posted by lowmileage
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I'll join you in heresy: I adjust idle speed on a SPICA car with spark advance!
BTW, really nice car.
Last edited by William Langley; 04-22-2008 at 02:26 PM.
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04-22-2008, 02:24 PM
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Certified Oldschooler
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Join Date: Aug 2007
Location: Houston & Spicewood, Texas; CA before that
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My 69 does have an idle adjustment screw of some sort and it increases the idle a bit and it leads to backfires.
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Anfanuts; Ph.A., B.S.A.
Now - '69 1750 Spider Veloce ( pictures)( and more) 10562.1480323 (since '75 for that early mid-life crisis!);
- '88 Bayliner, 305 CI Cvy (for those really hot days!)
Gone - '69 1750 Berlina (wish I still had)
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04-22-2008, 02:28 PM
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ReAlfisted 3/06
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Join Date: Sep 2005
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 Hey buds, I'd just be a tad careful talking about circumventing anything regarding what has been written about the Spica if I were you . Guy in this house I heard was fiddling with the mixture set-up trying to get his to idle right  .
__________________
1973 GTV - bought 3/06
1969 GTV, #AR1530021 - sold 10/72
Last edited by lowmileage; 04-22-2008 at 02:32 PM.
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04-22-2008, 02:34 PM
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Registered User
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Thanks, lowmileage, that was a good one. I needed a good laugh!
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04-22-2008, 02:45 PM
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The backfires were not that loud, a kind of burble . . . .
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Anfanuts; Ph.A., B.S.A.
Now - '69 1750 Spider Veloce ( pictures)( and more) 10562.1480323 (since '75 for that early mid-life crisis!);
- '88 Bayliner, 305 CI Cvy (for those really hot days!)
Gone - '69 1750 Berlina (wish I still had)
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04-22-2008, 03:10 PM
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ReAlfisted 3/06
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Join Date: Sep 2005
Location: Back in the garage
Posts: 5,830
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Hopefully you then may be spared 
__________________
1973 GTV - bought 3/06
1969 GTV, #AR1530021 - sold 10/72
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04-22-2008, 03:14 PM
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Certified Oldschooler
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Join Date: Aug 2007
Location: Houston & Spicewood, Texas; CA before that
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I only tweaked the screw officer, really!! It just makes more noise due to the stinger . . .
__________________
Anfanuts; Ph.A., B.S.A.
Now - '69 1750 Spider Veloce ( pictures)( and more) 10562.1480323 (since '75 for that early mid-life crisis!);
- '88 Bayliner, 305 CI Cvy (for those really hot days!)
Gone - '69 1750 Berlina (wish I still had)
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04-22-2008, 04:18 PM
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with the Librarian
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Join Date: Feb 2003
Location: New Jersey USA
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Quote:
Originally Posted by Anfanuts
My 69 does have an idle adjustment screw of some sort and it increases the idle a bit and it leads to backfires.
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The idle on the 69s is adjusted via the idle equalizers mounted to the air cleaner. To which adjusting screw of sorts are you referring to, sir. (me thinks the delivery adjust screw perhaps)
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Jim
Series 1 Euro 1750 GTV
Series 2 US 1750 GTV
Series 3 Spider Veloce
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04-22-2008, 04:47 PM
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74 Alfa Spider
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Join Date: Jan 2003
Location: Rapid City SD
Posts: 4,698
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Quote:
Originally Posted by Anfanuts
My 69 does have an idle adjustment screw of some sort and it increases the idle a bit and it leads to backfires.
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With regards to the 4kg load when testing the TA, yes, technically that's correct and if there's air in the system that could possibly give a false reading. Usually if there's air in the system the TA is leaked pretty good and probably won't test correctly even without a load.
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John Stewart
74 Spider
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04-22-2008, 05:32 PM
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I'll take a pic of the screw (slotted top requiring only a longshank screwdriver and no special tool on my 69 anyway) when I'm at the car's location next (this weekend). After a Spica FI pump rebuild by Wes, my Alfa mechanic said it was a cheating way to slightly increase the idle speed and sm ooth it out a tad, as his efforts on the equalizers did not work. It is the screw you refer to on the intake manifold and it opens the throttle plate a tad BUT was introducing backfire so I screwed it back 1/4 (CCW) of the 1/2 turn he opened it (CW) and it diminished burble to a tolerable level and remained smooth (except for a periodic miss on #4 which he believes is the brake booster vacuum line check valve hanging up) . Perhaps it is a faulty set-up on the install. I'll have Joe Foster check it next time I see him. Cheers,
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Anfanuts; Ph.A., B.S.A.
Now - '69 1750 Spider Veloce ( pictures)( and more) 10562.1480323 (since '75 for that early mid-life crisis!);
- '88 Bayliner, 305 CI Cvy (for those really hot days!)
Gone - '69 1750 Berlina (wish I still had)
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04-23-2008, 01:59 PM
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74 Alfa Spider
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Join Date: Jan 2003
Location: Rapid City SD
Posts: 4,698
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If the idle stop screw has been messed with, it should be reset with the factory tool. The position of the relay crank, especially at idle is very important to establish the relationship between the throttle butterflies and the fuel delivery of the injection pump.
The Spica idle air system is not very precise nor does it modulate well when adjusting. As long as the other setting are correct and you get between 600-900 rpm at hot idle, that's good.
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John Stewart
74 Spider
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04-23-2008, 02:16 PM
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