1985 6.2 vacum pod on 1996 6.5 vacuum

[mike91]

Can i put a vacum pod off off 1985 6.2 vacum pump [gear driver] on a 1996 6.5 vacum pump [belt driven], thanks, mike

[Yukon6.2]

Hi
Yea you should be able to do that,i used one off a ford belt drive on my 6.2.
Thomas

[DmaxMaverick]

Yes, but the OEM fuel manager will have to go. IMO, neither vacuum pump is better than the other, so if you have a reason to use one over the other, more power to you. No loss or gain, either way.

[ruhrinec]

Is the amount of vacuum relative to the speed of the engine the same regardless of where the vacuum pump is driven from?

I was surprised how much resistance the cam driven gear pump creates as well as how large the pulses are per rotation.

Would it make sense to take this oscillation off the valve train and allow the already loaded serpentine belt to carry the load?

Just wondering if the cam driven vacuum pump could cause unwanted harmonics on a timing gear setup and rob more power than if it was belt driven.

[DmaxMaverick]

It may sound reasonable in theory, but I'm not aware of any valve train issues due to this. However, it may have been an engineering concern with the electronic pumps, which were in development at the time the 6.5 (MFI) was introduced.

[john8662]

The belt-driven vacuum pump was used for quite some time before the 1994 6.5TD for turbocharger control. It was first introduced on the 1984 Model G20 and G30 Vans only because of space considerations. In 1984 the fuel filtration went to the single cartridge Model 80 Filter on Trucks and Vans. Due to space constraints at the back of the engine where the new Model 80 would be mounted to the back of the intake manifold, GM moved the vacuum pump to be belt driven.

This belt-driven pump was later used again on GMT400 trucks in 88-90 because of the TH400 transmission and the fuel manager mounted on the back of the intake manifold still (Model 80). It was also used on trucks equipped with C Series 6.2's for the emissions equipment.

This belt-driven vacuum pump continued its use on the 6.2 and 6.5, primarily due to fuel filtration cartridge location either Model 80 or 100.

I do think that a vacuum pump mounted to the belts makes a smoother running engine relieving the valve train/camshaft/timing chain.

J

[Yukon6.2]

I believe the OP wanted to know if just the pod could be changed from the 6.2 distributor style drive to the 6.5 belt style drive.The pod died on my 6.2 distributor style vac pump and i took the pod off a 7.3 ford belt drive vac pump and installed it on my 6.2 distributor drive pump.
So i believe you can change the pod back and forth between the different type drives.
Thomas