The difference between 1.6NA and 1.6TD pumps.

[8v-of-fury]

Other than the lid being stupid obvious, what is different about the actual pump bodies?

I have had two open side by side in the last week, and I see absolutely zero difference between them

yet I am sure I have been told before they are not the same.. It would seem to me, that ALL the boost aneroid stuff is dealt with in the top of the pump.. therefore the bodies are exactly similar.

Ye or Ne?

[wolf_walker]

It's been said often one can run a turbo pump on a NA with no ill effects.  While I have no hard data I've done it, and vice versa, and never saw any measurable difference in the seat-o-pants meter.  FWIW.  I always wondered if the advance curve differed some.  All I've had were high milers so they were presumably all worn in/out to some degree.

[damac]

No techie here but I ran into this months ago when I got a local na pump that had tight mainshaft bushings.

Popped the top and found the governor arm into the lid wasn't notched like my turbo pumps so one big assembly so I had no option but to tear it down.

Also the delivery valves were shorter on na pump, so I used all my relative turbo bits and high pressure end.

Also there was a pin staked into the na body  that gets in the way of the levers from the turbo top as I have read around here.  So when I had it apart I just grinded it flush from the inside and all has been well.

[8v-of-fury]

Yes that pin that comes in on the side is all I can see as the only difference.

[8v-of-fury]

1.6 NA




1.6 TD




Beside Each other.

[Mark(The Miser)UK]

Great pictures.

Funny how Bosch allowed that degradation of identity stamp on the later pump. Generic body compared with specific batch production on the n/a.  The TD is rated @2250rpm, whilst the n/a @ 2400rpm.

As a pump novice, I wonder if that means the governors were different, or even advance rate? It would make sense as an n/a has to operate at higher rpm to get sufficient power.

Maybe n/a body with TD head, gives best high range

[R.O.R-2.0]

Great pictures.

Funny how Bosch allowed that degradation of identity stamp on the later pump. Generic body compared with specific batch production on the n/a.  The TD is rated @2250rpm, whilst the n/a @ 2400rpm.

As a pump novice, I wonder if that means the governors were different, or even advance rate? It would make sense as an n/a has to operate at higher rpm to get sufficient power.

Maybe n/a body with TD head, gives best high range

seems to go along with what ive found.. my REAL td pump would come on sooner, and fall off quicker..

[Mark(The Miser)UK]

Does anyone have a pic of the badge's of the yellow dot, and a standard 107? Actually, just the Bosch coding figures read off would suffice
Also a couple of measured dynamic advance readings for a true yellow dot pump? It's the missing link in my graph I'm constructing.Thanks

[RabbitJockey]

i guess id need to tap an out bolt and put a pressure gauge in it for this? i have a yellow dot pump

[Mark(The Miser)UK]

i guess id need to tap an out bolt and put a pressure gauge in it for this? i have a yellow dot pump

Hi Trevor,
Do you have a diesel timing light which would give the actual pump advance? THat is some of  the infoermation I'm looking for. THe internal pressure of the pump at a few different speeds would also be useful to correlate with the figures given by Hagar some years ago. I'll post a picture or a link to several different ways of measuring the internal pressure of the pump including my own method tomorrow. I'm too tired to do it now, as it's 2.30am her and I've just written an essay on heatshields, and hunted down some pictures I'd mislayed.
Cheers,
Mark