Vacuum distributor line
#1
Instructor
Thread Starter
Vacuum distributor line
Hi guys,
Going through my newish 928 S (1983 ROW) slowly and catching up on maintenance and fixing things as I go.
There is a vacuum line coming out of the distributor that has been blocked off. Firstly should it be connected and if so where to?
I will be replacing all vacuum lines and fuel lines along the way.
Many thanks
Going through my newish 928 S (1983 ROW) slowly and catching up on maintenance and fixing things as I go.
There is a vacuum line coming out of the distributor that has been blocked off. Firstly should it be connected and if so where to?
I will be replacing all vacuum lines and fuel lines along the way.
Many thanks
#2
Team Owner
looks like all of the hoses should be replaced and a new set of ignition wires fitted
#4
Three Wheelin'
Hi guys,
Going through my newish 928 S (1983 ROW) slowly and catching up on maintenance and fixing things as I go.
There is a vacuum line coming out of the distributor that has been blocked off. Firstly should it be connected and if so where to?
I will be replacing all vacuum lines and fuel lines along the way.
Many thanks
Going through my newish 928 S (1983 ROW) slowly and catching up on maintenance and fixing things as I go.
There is a vacuum line coming out of the distributor that has been blocked off. Firstly should it be connected and if so where to?
I will be replacing all vacuum lines and fuel lines along the way.
Many thanks
#6
Instructor
Thread Starter
Thanks guys. Yes replacing all the vacuum lines is on the list, along with fuel lines and spark plug wires and a bunch of other stuff, catching up on some maintenance takes some time and $$
Cheers
Cheers
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#9
Instructor
Thread Starter
You are correct SwedeInSiam! 928s to Sweden and Australia had the vacuum advance deactivated for emissions reasons.... not sure what it was for exactly, but wondering now if it could be re-connected for any gain.....
#10
Rennlist Member
In that drawing are the bottom vacuum connections at the throttle body on the filter side of the throttle body and the top single vacuum line on the engine side of the throttle body?
#11
Rennlist Member
If you run premium (98 RON), and you connect it, you can set the advance to 26 degrees BTDC @ 3000 RPM (up from 23 degrees), and you should get improved throttle response and economy. With those settings you are safe with 98 RON Premium, but with normal unleaded you might get knocks, and have to back the timing off.
I recommend replacing the fuel lines running over the RH cam housing with Greg Browns versions, which are a major improvement over the originals, in that very hot location. Get them direct from Greg, or Roger at 928'sRus also stocks them.
In the pic I can see your coil cover is missing ... stops water dripping on it from the bonnet/guard gap.
#12
Instructor
Thread Starter
Thanks Dave. I am going to connect back up and adjust timing to suit, I always run 98 fuel.
Will look into the fuel lines, they will all be replaced along with just about everything else in there.....
We should get together someday, virtually in your back yard.
Will look for a coil cover too, the jump post cover is missing too....
Cheers
Will look into the fuel lines, they will all be replaced along with just about everything else in there.....
We should get together someday, virtually in your back yard.
Will look for a coil cover too, the jump post cover is missing too....
Cheers
#13
Race Car
I think you'll notice quite a difference, timing and fuel adjustments made a discernible difference on my (former) 83 S/ROW.
You want to makes sure that vac port and hose to the WUR (item 3 in schematic) is tight as well, for accel enrichment.
Note also that the factory image shows a WUR with both an upper and lower (accel and decal) vacuum feed and I'm not seeing it on yours.
They both originate at throttle body, one above and one below the throttle plate.
The single feed WUR is less costly..so it raises the question-- fuel curve aside-- if there was a swap how was the line capped/terminated and is it still holding good vacuum.
You want to makes sure that vac port and hose to the WUR (item 3 in schematic) is tight as well, for accel enrichment.
Note also that the factory image shows a WUR with both an upper and lower (accel and decal) vacuum feed and I'm not seeing it on yours.
They both originate at throttle body, one above and one below the throttle plate.
The single feed WUR is less costly..so it raises the question-- fuel curve aside-- if there was a swap how was the line capped/terminated and is it still holding good vacuum.
#14
Instructor
Thread Starter
I think you'll notice quite a difference, timing and fuel adjustments made a discernible difference on my (former) 83 S/ROW.
You want to makes sure that vac port and hose to the WUR (item 3 in schematic) is tight as well, for accel enrichment.
Note also that the factory image shows a WUR with both an upper and lower (accel and decal) vacuum feed and I'm not seeing it on yours.
They both originate at throttle body, one above and one below the throttle plate.
The single feed WUR is less costly..so it raises the question-- fuel curve aside-- if there was a swap how was the line capped/terminated and is it still holding good vacuum.
You want to makes sure that vac port and hose to the WUR (item 3 in schematic) is tight as well, for accel enrichment.
Note also that the factory image shows a WUR with both an upper and lower (accel and decal) vacuum feed and I'm not seeing it on yours.
They both originate at throttle body, one above and one below the throttle plate.
The single feed WUR is less costly..so it raises the question-- fuel curve aside-- if there was a swap how was the line capped/terminated and is it still holding good vacuum.
Cheers
#15
Rennlist Member
Removing the spider is worthwhile doing, as it doesn't take long, you can see everything, and it's piece of cake to lift out the whole plenum/throttle assembly. Once out you can clean the V and the whole assembly, replace the rubber mounts which I guarantee will be shot, and with everything easy to see, get the rest perfect.