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  #1  
Old August 19th, 2009, 05:30 PM
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Mallory UNILITE

Hey everyone,

For those of you who are running the Mallory UNILITE distributor (particularly part #4768901), did you modify its advance curve? And if you bought the one from somewhere else, do you know if they modify them? I got mine from Amazon.com, so I'm assuming it's about as stock as it comes...

Long story short, I'm troubleshooting a higher-than-normal (~210-220 deg. F) engine temp issue that occurs >2200 RPM and I'm now suspecting that it's a timing advance issue. My base timing is 6 degrees BTDC. Looking at the RRC 3.9 shop manual, I should be getting 6-8 degrees @1800 RPM and 5-8 degrees @2200 RPM... I'm getting 12 and 18 degrees respectively. The D90 manual seems to just leave this stuff out so I guess it doesn't apply??

Any insight on the advance curve requirements of the 3.9 and/or your experience with the UNILITE's advance curve would be much appreciated!

Thanks!
Travis
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  #2  
Old August 19th, 2009, 05:56 PM
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I have $10 that says your radiator is partially clogged.
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Old August 19th, 2009, 06:32 PM
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Gren Thomas
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Hi Travis it would really suck if Ron is correct however check this:http://www.v8engines.com/faq-mall.htm#internal

I bought my mallory from RPI already set up and was the best bolt on I did to my V8 even if it turns out that ron is right and i think he is the mallory is worth fitting.

regards
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  #4  
Old August 19th, 2009, 07:11 PM
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Not to hijack but it is so easy to take the D90 radiator out, it should be as normal maintenance as changing plugs or wires. Getting the rest of the system flushed out might not be so easy.

Is the Mallory really all that great? Hotter plugs and leaner fuel would make more heat?
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Old August 19th, 2009, 08:53 PM
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Travis

While this doesn't answer your question (because I have no idea) I'm curious about which mods RPI made to the Mallory Unilite that seemed to make such a difference.
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  #6  
Old August 19th, 2009, 09:31 PM
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Also verify that the timing marks on your balancer are correct. They are known to have accuracy issues, mine was about 6 degrees off from reality. Also don't forget to do your timing adjustments with the vacuum advance disconnected. I didn't make any changes to mine internally, except for swapping in the newer style e-spark module. (which I used the alternate wiring schematic that comes with the e-spark instructions).

Looking at the modification page on RPI's website, all the modifications they discuss seem to be applied to the dual-point distributor, not necessarily the unilite.

I'd pull it back 2-3 degrees from where it is now and see what happens.

-Hans
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  #7  
Old August 20th, 2009, 12:00 AM
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Quote:
I have $10 that says your radiator is partially clogged.
True, I have the typical symptom, but just three months before this started happening I had installed a new genuine LR radiator... I never had a problem until after I put in the Mallory (though that was also when the weather got hot). And for those curious, I only bought the Mallory because the original Lucas unit packed-in.

I just flushed the whole system again last weekend and sprayed high-pressure water through the radiator without issue. I even flushed the old coolant out with air and vacuum-filled it with the blue BMW stuff (why not... nothing else has done anything).


Quote:
Originally Posted by Hans
I'd pull it back 2-3 degrees from where it is now and see what happens.
I also tried this without any change in behavior. I might resort to double-checking the timing mark, because there's not much else to do!


I'm still curious about the optimum advance curve (or tolerances) for the 3.9. And/or if my measured timing at 2200 might indeed be way off and thus causing my problem.

Thanks!
Travis
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Old August 20th, 2009, 12:11 AM
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was it 2200rpm at speed? or 2200rpm sitting still?

-Hans
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  #9  
Old August 20th, 2009, 09:04 AM
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Travis Graham
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Quote:
was it 2200rpm at speed?
At speed. Currently the vacuum advance is completely disabled, because even at a minimum setting, I'd still hear knocking on some occasions.


Quote:
http://www.v8engines.com/faq-mall.htm#internal

I bought my mallory from RPI already set up and was the best bolt on I did to my V8 even if it turns out that ron is right and i think he is the mallory is worth fitting.
Back to this one: That's interesting. Their wording in the yellow box seems to indicate that they set the ceiling 8-10 degrees lower if it's not set for LPG, yet further down the page they say 34-36 degrees provides good performance! Perhaps the 34-36 figure assumes LPG?

I'm tempted to borrow a Lucas and at least confirm (or refute) my suspicion, then get the adjustment kit if confirmed.

Travis
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Old August 20th, 2009, 05:58 PM
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Hi Travis drop a mail to chris @ RPI on their contacts page he is a mine of info and a very nice chap.


regards

Gren
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  #11  
Old August 21st, 2009, 11:18 AM
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Travis Graham
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Quote:
Originally Posted by Gren_T
Hi Travis drop a mail to chris @ RPI on their contacts page he is a mine of info and a very nice chap.
Thanks! I'll give him a try. Hopefully he has time to email me back, because I couldn't fit much into 150 characters on their form (and also include things like "thank you").

Best,
Travis
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