Hey all, for those with big cams and poor vacuum, has anyone fitted a Alternator from a Diesel engine that has a built in Vac pump?
Anyone know a suitable model that will fit?
Diesel Alternator/Vac pump on holden 308
Started by
_Viper_
, Aug 12 2018 06:12 PM
8 replies to this topic
#2
mick_in_oz
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Posted 12 August 2018 - 07:28 PM
NOPE, but I did toy with the idea some 8 plus years ago, I lost interest when I realised the alternator I collected needed an oil pressure feed, then I wondered what the pump would think being spun at more RPM, or should I do a custom pulley for it to be able to have the RPM correct, and that was that.
I ended up using an electric Hella UP28 series pump.
If you do it I'd like to see some pics!
#3
rexy
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Posted 12 August 2018 - 11:07 PM
I had the same thoughts expressed above.
The fiddling around to create oil feed and drain lines directed me to an electric pump solution.
The fiddling around to create oil feed and drain lines directed me to an electric pump solution.
#4
bat 53
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Posted 13 August 2018 - 09:55 AM
some of the alloy tech engines in ve commies have an elec vac pump on the front of the engine
#5
_Viper_
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Posted 13 August 2018 - 06:10 PM
Ahh ok, Didnt realise they needed a oil feed and drain too... Standalone electric pump would be much easier then.
Do you also need a Vacuum tank?
#6
Bigfella237
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Posted 13 August 2018 - 08:13 PM
Wouldn't be that hard to take an oil feed off a T-piece from the oil pressure sender and weld a drain bung/tube into the sump, but you would have to be careful to restrict the feed as the sender is located before the oil flows into the engine, you wouldn't want to starve the engine just to feed a vacuum pump!
There may well be a restriction in the pump from the factory though, have a look where in the circuit the oil is fed from on the original diesel engine, if it also comes straight out of the pump you would probably be okay doing the same?
On the plus side, diesel alternators are usually a fairly high amperage.
On the minus side, the vacuum pump adds a lot to the overall size of the unit, you may have trouble in a Torana engine bay?
#7
jonesy
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Posted 13 August 2018 - 09:14 PM
I had one plumbed into my old 355 stroker when i purchased it to increase the vacuum as I have issues with the brakes so it certainly can be done and I'm not a hundred percent sure but I think you'll have to check the RPM specs on it cause you may need to change the pulley
#8
jonesy
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Posted 13 August 2018 - 09:16 PM
And as big fella said mine was plugged in via t piece and it was on a Hz so there was plenty of room in the bay
#9
nc gtr
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Posted 22 August 2018 - 04:02 PM
Put an electric one from a Volvo on mine same hella on as on commadores.
Volvos have a T piece on top with a switch and check valves incorporated.
Just put relay comes on through switch . Works good and only cost $30 from pick a part.
Volvos have a T piece on top with a switch and check valves incorporated.
Just put relay comes on through switch . Works good and only cost $30 from pick a part.
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