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Author Topic: gasoline question  (Read 646 times)

Jacques

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gasoline question
« on: March 20, 2009, 02:46:10 PM »

If I sell the Imp, I first have to convert it to gasoline. It's an almost stock 440.

There already is a gasoline tank on the car. I think I'll need fuel line, a carb , fuel filter and a fuel pump.

Considering an Edelbr. 1411.

But I was wondering, what ignition curve + initial advance setting would be a good starting point for tuning it? see:
http://www.msdignition.com/uploadedFiles/MSDIgnitioncom/Products/distributors/8387_instructions.pdf
Currently, I'm running curve F with black stop bushings, and 16 degrees of advance. What would be a good base setting for running on premium gasloine?

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Jacques

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gasoline question
« Reply #1 on: March 22, 2009, 02:28:01 AM »

Nobody? Is my question so stupid that it's embarassing? Or dont you guys drive on gasoline? Or do gasoline-drivers just throw in a random ignition curve in their car?

I dont know much about that type of fuel, since I only drive on propane....


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Stan Paralikis

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gasoline question
« Reply #2 on: March 22, 2009, 07:11:34 AM »

I didn't reply because I  didn't want to sound stupid.

Steve

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gasoline question
« Reply #3 on: March 22, 2009, 07:36:23 AM »

Loaded question
 
I think the standard is a 10*  but don't quote me.  Maybe Bob has a manual  for the Imps and he can look to see what stock is.
 
Or the other oprtion is, leave the 16 in there and see how it goes.
 
I get noivous dealing with this when the data is not available.  This is an area I an very weak at because I never paid attention to it.
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Stitcherbob

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gasoline question
« Reply #4 on: March 22, 2009, 07:57:42 AM »


 I didn't reply because I haven't got an 73 Imp manual yet, but my 66 shop manual says a 440 (first year for them) should be 12 1/2 deg B.T.C basic timing or 5 deg A.T.C with the Cleaner Air Package. These engines had 10 to 1 compression and cam specs at:




stitcherbob2009-03-22 12:15:56
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Jacques

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gasoline question
« Reply #5 on: March 22, 2009, 08:19:36 AM »

Yes, I have the manual, but that was written based on the fuel available in those days.

Also, if I interpret the data from the shop manual, the factory dizzy's were not very accurate, as a range of advance is given for a certain rpm, and doesnt mention any higher rpm than 2400. On the contrary, the MSD-dist is very accurate when it comes to dialing in a curve. So I was wondering which would result in best performance and economy.

Any thoughts on this? As I would like to sell the car performing as well on gasoline as it does now on propane...
The initial advance is very easy to fiddle with, since I have the MSD adjustable timing control, so I can dial in more or less initial while driving.


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Stitcherbob

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gasoline question
« Reply #6 on: March 22, 2009, 08:25:20 AM »

Does maybe Jyrki have any thoughts on this one? He knows your fuel type and that car of his is C body performance personified

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Jacques

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gasoline question
« Reply #7 on: March 22, 2009, 08:36:59 AM »

Yeah but I only have a low-compression 440. It's just that I dont want to try 10 curves randomly, want to give the new owner a good basic setting. Of course it wont be totally fine-tuned, espacially since carburettors are almost like white magic to me LOL

And do you think the Eddy 1411 is a good choice?


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Stitcherbob

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gasoline question
« Reply #8 on: March 22, 2009, 12:18:25 PM »

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Jacques

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gasoline question
« Reply #9 on: March 23, 2009, 04:56:15 AM »

Good find Bob, thanks!
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firedome

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gasoline question
« Reply #10 on: March 23, 2009, 05:26:53 AM »

Plus your fuel may be very different that what is available here - in the NE US ours has 10% ethanol.

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Rich

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gasoline question
« Reply #11 on: March 31, 2009, 03:22:39 PM »

I have a 1975 Motors manual that shows 440's should be set at 10 before TDC at 700 rpm.  I first remove the vacuum advance line from the carb and plug it, then set the rpm to 2500 and dial in the timing to 32-35 degrees advance. I then hook the vacuum line back up and hope to see 50 degrees total. Setting the idle back down to 700 rpm then should show you around 10 degrees advance.  You may have to dial in a bit more or less depending on your distributors timing curve, but I wouldn't go more than 12 degrees advanced with the crappy gas we have now.

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