Timing question about sp 1500 engine

[Herrbern]

Hi,

On my 1500cc sp engine of my 67 vert, I have the static timing set at 7.5° btc, like in the owner manual of the car.
Now, when I set the idle at 850 rpm and when I check the timing with the timing light, the timing is 10° btc!!
With the engine idling, when I remove the depression tube, timing gets back to 7.5° btc.
My conclusion is that the depression is working even at idle. I thought that the depression was only working above 1000 rpm. Or am I wrong ? Is it normal for my car what I see with the timing?
All parts are genuine on the car.

Carb : Solex 30 PICT
Distributor 205k

What is wrong?

Thanks,

Bernard

[glutamodo]

It is not unusual for there to be some vacuum signal present even at idle on the PICT, PICT-1 and PICT-2 carbs. It was only after the PICT-3s where the throttle is fully shut for idle that you get a zero vacuum signal at idle. I'd not worry about it, just do like you did, check that idle timing with the vacuum line unhooked.

The EMPI 30PICT-1 clones, at least when they first came out, were particularly bad about too much vacuum at lower speeds due to the placement of the lower vacuum drilling being slightly off. I talked about that in depth here:

http://www.thesamba.com/vw/forum/viewtopic.php?t=278191

-Andy

[gt1953]

You did good, what is the timing at say 2500 to 3000 RPM?
_________________
Volkswagen: We tune what we drive.
Numbers Matching VW's are getting harder to find. Source out the most Stock vehicle and keep that way. You will be glad you did.

72 type 1
72 Squareback
({59 Euro bug, 62, 63, 67, 68, 69, 73 type ones 68 & 69 type two, 68 Ghia all sold})

[mrbigmax]

[Herrbern]

I have a new issue with the 205K.
I habe replaced the points with an Ignitor II and when I set the timing with strobo, I have 7.5 BTDC. When I connect the hose again, I have way too much advance. I am over 10 BTDC. So I retarded the ignition with the hose on at 10 BTDC at 900rpm. But is is so strange that the timing changed so much.
Could it be the carb ? I am still running the original Solex 30 PICT-1. Or is this due to the electronic ignition ?

Anyone has ever experienced that ?

[Towel Rail]

[Herrbern]

[Sharp64]

How is the throttle shaft play? If you’re having to have the idle fast screw that far in it sounds like you’re having to overcome a vacuum leak.
_________________
1960 Indigo Blue Ragtop (Blue Barry)
1967 Ghia
1985 Westy Money Pit
“...some men aren't looking for anything logical, like money. They can't be bought, bullied, reasoned, or negotiated with. Some men just want to watch the world burn.” - Michael Caine

[Herrbern]

[Towel Rail]

If the engine idles happily at less than 850 RPM, I'd let it.
_________________
1974 Thing -- under the knife
1967 Beetle -- spring/summer/fall driver
1996 Subaru OBW (EJ22, 5-speed, AWD) -- winter car, 3-seasons "don't feel like biking today" car

049 > 070 > 053 > 009

[KTPhil]

[Slow 1200]

are you running on 4 cylinders at idle? sounds like the idle speed screw needs to be all the way in to compensate for some other issue, the throttle plate is so open that you are getting vacuum

besides that, those vacuum only distributor end up being very sloppy and overadvancing at idle

[Herrbern]

[Cusser]

[Sharp64]

Check to make sure the mating surfaces are flat and the top isn’t warped. Also, check your float level. Did you put the correct 1mm ( I believe) washed between the float valve and top? If it sits too high it can allow the valve to stay open and overflow the bowl. Use the old needle valve if you have it instead of the new one.

I would HIGHLY recommend getting a sonic cleaner for the carb. Even after soaking in carb cleaner for hours you’d be amazed of the crap that will still come out. Also blow all the passages out with air after.
_________________
1960 Indigo Blue Ragtop (Blue Barry)
1967 Ghia
1985 Westy Money Pit
“...some men aren't looking for anything logical, like money. They can't be bought, bullied, reasoned, or negotiated with. Some men just want to watch the world burn.” - Michael Caine

[Herrbern]

[Sharp64]

[mukluk]

If the spare/leaky carb top is warped and can't be made to seal, a possible solution would be to swap the top over from your other carb.
_________________
1960 Ragtop w/Semaphores "Inga"

[Herrbern]

Well, I have too much play on the spare carb. The bushings are worn out. I will remove them and rebush with brass. The carb on the car has also too much play and the idle is clogged because compressed air is not going thru. I will clean both carbs and redo them completely.

[theblake]