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Old 08-01-2006, 08:29 PM
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Crane XR-1 Ignition question

I recently put in a Crane XR-1 Electronic conversion in my '62 Corvette. The distributor is a 340 dual-point. All other engine parts, systems, adjustments (including timing) have been set. Engine still runs a little rough from idle to a couple thousand rpm if you bring the rpms up slowly. If you crank the throttle the response is quick and smooth. I'm thinking maybe the roughness is due to the Crane unit and I am thinking about switching back to the points. Anything I should look at first? because it is a dual point dist, I had the make a small notch in the metal base that comes with the kit to clear a screw in the dist. Would this repositioning make a difference. Cap, rotor, wires, plugs all brand new.

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Old 08-02-2006, 03:04 PM
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I can't say for sure what the problem is but when I went to go buy the XR1 the guy at the parts counter said they have had A LOT of problems with them. It would probably be easiest to change back to your points and see if that helps.

It seems like lots and lots of people have had problems with drop in ignition conversions. I ended up forking over the $300 for a Davis DUI setup.
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Old 08-02-2006, 03:11 PM
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i've installed the crane setup in a sbf that had a single points distributor - has worked fine ever since. i dont remember having to notch anything for proper operation neither? i've also installed a few pertronix units in sbf's without problem too. there are mixed emotions about pertronix points eliminators all over this board, however, i have never experienced anything of which anybody ever complained about.
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Old 08-02-2006, 04:47 PM
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part #750-1710 on cranes web site said for single points only so maybe ask them if there is a difference.
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Old 08-02-2006, 07:27 PM
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Quote:
Originally Posted by GCD1962
I recently put in a Crane XR-1 Electronic conversion in my '62 Corvette. The distributor is a 340 dual-point. All other engine parts, systems, adjustments (including timing) have been set. Engine still runs a little rough from idle to a couple thousand rpm if you bring the rpms up slowly. If you crank the throttle the response is quick and smooth. I'm thinking maybe the roughness is due to the Crane unit and I am thinking about switching back to the points. Anything I should look at first? because it is a dual point dist, I had the make a small notch in the metal base that comes with the kit to clear a screw in the dist. Would this repositioning make a difference. Cap, rotor, wires, plugs all brand new.
I Have XR-1 in my 65 and it works fine and is driving an older MSD box. Several things that might give you trouble is a badly worn distributor cam that would work ok for points but not for the electronic trigger. A wobble of the dist. shaft from worn bearings. Not having the pickup close enough to the cam and poor grounds.
Good Luck
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Old 08-02-2006, 07:46 PM
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Might be the cam worn a little as the roughness is consistent, like it slightly misses each time it fires in that place. Directions are unclear as to how close it should be set to the lobe, but it is quite close. I realized afterwards that it lists for a single point dist, but I think the only difference is because the module mounting plate hits a mounting screw that holds the breaker plate to the dist. I ground away some of the mounting plate (without the module on it) to clear the screw. I think I'll yank it out tomorrow and set the points on a distributor machine
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Old 08-03-2006, 01:55 AM
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Rather a far out idea, but maybe worth a try. Whether it is a points setup or an aftermarket replacement, the triggering mechanism must be "clocked" properly in reference to the distributor cap. In other words, if the Crane unit fires the coil and it is between the terminals, things are not going to run that well. Since this was a dual point distributor, you have a choice of two spots to mount the Crane, maybe try the other side of the plate where the other points set would have gone.

Only problem we have run into with the Crane is not being close enough to the lobes, and that problem only showed up at higher RPM with the unit dropping out on the distributor machine. We cured that problem by getting it up as close as possible to the lobes without touching.
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