CRANECAM Fireball XR700 - Page 2 - Mercedes-Benz Forum

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post #11 of 20 (permalink) Old 01-03-2005, 03:07 PM
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Thanks again.

Hi Again. Thank you for your input. Maybe my trouble is not knowing what wires go into the balast resistor. I set it up using the same wire into the new resistor that went into the old resistor without really knowing where it came from.
The Crane Instruction shows 12V Battery wire into resistor and a wire from the start position of ignition key comming in between the resistor and coil. am I looking at that correctly? would that give you constant hot to the coil or is that 12v battery wire supposed to run thru the ignition switch too. Thanks again, Pat.
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post #12 of 20 (permalink) Old 01-03-2005, 05:43 PM
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RE: CRANECAM Fireball XR700

Wish I knew more about where the wires that go into the resistor come from.
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post #13 of 20 (permalink) Old 01-03-2005, 11:42 PM
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RE: Thanks again.

i am looking for that manual.. i just can't even recall last time i saw it... i didn't have a chance to look under the hood...



in political asylum
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post #14 of 20 (permalink) Old 01-04-2005, 01:23 PM Thread Starter
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RE: CRANECAM Fireball XR700

still waiting on my fireball. reading all this makes me nervious. i hope i dont have too much trouble installing this thing. dont know if i should snap a few pics and post them before and after. might be a good idea to snap them anyway.

grez
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post #15 of 20 (permalink) Old 01-04-2005, 03:26 PM
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Its all figured out.

Hi Grez, Dont be nervous. I wrote to George Murphy (the person I bought the xr700 from) and I talked to some others who have done it and aparently I had it right all along from following the crane instruction. The balast resistor ( i'm told ) smoked because it was new and I should have let it smoke for a few minutes but I was scared and just let the car sit there for three months before writing to these forums.
Also one person that I trust said the stock coil and balast resistor work fine with the xr700 , so now I'm psyched. I am going to go out there and get it running this weekend. I may put the old resistor back on. Good luck with yours. I will write back if I'm sucessful and I sure would like to hear how your's goes. PAT.
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post #16 of 20 (permalink) Old 01-16-2005, 12:09 AM Thread Starter
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RE: CRANECAM Fireball XR700

YES YES YES!!! she fired on the first try.

got the fireball on wednesday. put the coil in on wednesday. had to wait for thursday to put brain in. found the old resistor under coil and replaced with one in box. ran wires for brain and connected like diagram. was off TDC by a hair, but not problem. had alittle trouble with mounting bracket and IR sensor inside distributor. had to leave out a base plate mounting screw to make clearence. wasnt sure if vacuum advance should still be attached. i did it anyway. still not sure if its right. either case its on and vacuum line remains. got wires complete and returned everything to engine, plug cap rotor etc. cracked the cap getting it on, bastard. got a friend to fire and she roared. kicked smoke and heavy sputter from tail, rpm 2000. heavy fuel exhaust, way too rich. shut it down and advance sensor. ran bit better, advance again, ran smooth with sputter and rich. dialed idle screw to 1000. found fuel mix screw in book and dialed fuel all the way down. motor starts to purr. no sputter, no smoke, some vibration at intervals, i let warm for 10 minutes and had a smoke. almost like i just rubbed one out, u know...motor warm tweek idle again and took her for a drive. temp never broke 180. power weak and pings on an uphill. ping went away after 10-15 minutes of driving. i noticed the #1 spark plug when i removed it for TDC that it was white. was burning hot. had some trouble with temp before and added a SL fan. 8 blade verses 6 for original. since thurday i drove it twice for more than 30 each time. same readings everytime and smooth. idle at 900-1000, temp 170-190, no pings on uphill. now that leaves me with a time light to do on crank. have no way to know fuel mix is good but it seems good to me. other than a slight loss of power. but who cares, so long as i can still beat the tassles off a pink huffy......I'm cruuuuuzin babeeee.......HAHAHAHAHAHAHAA.....peace love and stripper poles.

grez
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post #17 of 20 (permalink) Old 01-17-2005, 05:03 PM
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RE: CRANECAM Fireball XR700

Hi , I'm glad it went so well for you. I put my old resistor back on and this time the wires didn't smoke. I adjusted the sensor and it is doing what it should and I am getting spark to the plugs. Unfortunately The battery didn't have enough juice to really turn it over. It sat too long in the cold garage. so I decided to watch football and wait for warmer weather. I know it will start when I charge the battery. Pat.
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post #18 of 20 (permalink) Old 01-18-2005, 07:47 AM Thread Starter
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RE: CRANECAM Fireball XR700

put a timing light to the mill and clocked in at 10 degrees. the pinging comes and goes, think its alittle lean now. not sure what ignition timing is supposed to be at, but runs well between 8-11, give or take a couple. this weekend i will enrichen the fuel a hair and see if ping remains. ill let u know.

grez
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post #19 of 20 (permalink) Old 01-28-2005, 04:53 AM
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RE: CRANECAM Fireball XR700

As a quick note here,you really should get an exhaust analyser hooked up,you may need to go to a tune up specialist for that.Run it too lean,(hot, white looking plugs) and you run a real risk of burning your exhaust valves,then it's major money.[:0]
The pinging you experienced would have been carbon deposits from bad performing plugs not allowing a clean burn.you've got hot spark now and it's allowing all the fuel to burn properly.As the carbon deposits heat up they ignite the fuel prematurely.[:(!]
Remember the golden rule,never adjust that idle mixture with the engine running! you'll destroy the govenor in the fuel pump[V]plus run the risk of injuring your fingers when the thumb screw is swallowed by the pump.[xx(][xx(][xx(]
A good cure for bad running MFI merc engines?,DRIVE IT!!![:D][:D][:D]
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post #20 of 20 (permalink) Old 02-12-2005, 06:27 PM
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RE: CRANECAM Fireball XR700

Just a note to say we had some warm wether (40 deg F) so I went out and put jumper cables on my battery and it started right up and ran better than it has since i've owned it. The dist. rebuild and installing the XR700 is the best thing I've done. Too bad I got scared off by the smoke when I first installed it but now I'm really glad I did it and would recomend it to anybody. Pat.
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