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Timing for JX pump on AHU MTDI
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vintagemotion
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Joined: December 13, 2009
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Location: Kleve Germany; Atlanta Georgia
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PostPosted: Tue Jul 13, 2010 7:50 am    Post subject: Timing for JX pump on AHU MTDI Reply with quote

Temporarily I’m running a JX pump on my AHU. With the pump rotated to the max advanced position the engine idles well and responses quickly.
I read the related postings describing the consequence of too much timing advancement and piston damage. I’m also aware of the snapping pump shaft legend.

I hope to get find advice on the following question

1.Has anyone long term experience and recommendation on the JX /AHU timing?
2.Is there an experimental method to advance a diesel pump?
(Like on a gasoline engines where ignition timing is set as advanced as possible without audible pre ignition pinging)
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82 orange Diesel Westy
AHU conversion (mechanical with stock JX pump)
5 Speed ASS
CLK Wheels 215/70/16
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SyncroGhia
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PostPosted: Tue Jul 13, 2010 11:59 am    Post subject: Reply with quote

I'm suprised you've managed to get a TDi running on a TD pump but I expec that it's down on power?

Try the GTD forums... these guys live and breath TDs, TDis and MTDis...

http://www.vwdiesel.net/forum/

MG
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vintagemotion
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PostPosted: Tue Jul 13, 2010 3:51 pm    Post subject: Reply with quote

Anything is faster than a stock 1.6 Diesel even a (T)DI with a JX pump.


Thanks for the link
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82 orange Diesel Westy
AHU conversion (mechanical with stock JX pump)
5 Speed ASS
CLK Wheels 215/70/16
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BlackDogVan
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PostPosted: Tue Jul 13, 2010 11:41 pm    Post subject: Reply with quote

The fact that you have it idling with the jx pump should slightly lessen the need for a nomex suit Wink
Are you using the JX pump head? I'm amazed it can crack the Tdi injectors. The idi pump might not have enough stock dynamic advance for the Tdi too. Can be modified tho but requires major pump surgery. Go for a land rover pump if possible, they are reasonably easy to fit for mtdi.
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westyventures
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PostPosted: Wed Jul 14, 2010 8:49 pm    Post subject: Reply with quote

Nope, the JX pump just won't do it, not without major mods, TDI head and camplate for starters. Cummins 4BT pumps like I use for my (brand new) mTDI pumps work very well. Gotta know what to do inside to get em right though. Wink
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vintagemotion
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PostPosted: Fri Jul 23, 2010 9:23 pm    Post subject: Reply with quote

I tried different setting and now I have the JX pump running pretty nice for a temporary setup.
0.9 stroke @ TDC produced too much smoke. It was very hard to start. I have driven 50 miles around town with a setting of 1.1mm and it drives pretty nice. I still have the stock exhaust with no turbo so the Westy is pretty slow but at least it is back on the road. 65 MPH is top speed. The Turbo and a proper MTDI are my next projects
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82 orange Diesel Westy
AHU conversion (mechanical with stock JX pump)
5 Speed ASS
CLK Wheels 215/70/16
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View user's profile Send private message Gallery Classifieds Feedback
vintagemotion
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Joined: December 13, 2009
Posts: 73
Location: Kleve Germany; Atlanta Georgia
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PostPosted: Fri Jul 23, 2010 9:24 pm    Post subject: Reply with quote

BlackDogVan wrote:
The fact that you have it idling with the jx pump should slightly lessen the need for a nomex suit Wink
Are you using the JX pump head? I'm amazed it can crack the Tdi injectors. The idi pump might not have enough stock dynamic advance for the Tdi too. Can be modified tho but requires major pump surgery. Go for a land rover pump if possible, they are reasonably easy to fit for mtdi.


The JX pump came straigh from a junket Turbo Jetta.
_________________
82 orange Diesel Westy
AHU conversion (mechanical with stock JX pump)
5 Speed ASS
CLK Wheels 215/70/16
Back to top
View user's profile Send private message Gallery Classifieds Feedback
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