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distributor interchange? ~/~/~/~ timing advance?
Posted 05 September 2003 - 10:24 PM
I'm using the distributor from the carbureted long block.
should i use an SPFI distributor even though i still have a carb?
When I was just getting the rotor/distributor gear in sync with the cam, I found that turning the dist all the way counterclockwise ran best so far, but if I turned the rotor/gear CC and then rotated the distributor all the way clockwise, it wouldn't run.
I haven't done the timing yet (dad's old timing gun died since last time i used it; found out an hour ago :temper: ) but I'm anticipating that I'll want to advance it and perhaps run higher octane gas? (carb motors usually have 8.5:1 compression, SPFI blocks have 9.5:1 )
Stock equipment is timed at 8deg BTDC according to the underhood sticker. I have the idle at about 850-900 (HTKYSA sez 700 but it dies). I'd appreciate any estimates where the timing will end up so that if it turns out off, i'll know i've got something else to adjust...
Posted 05 September 2003 - 10:35 PM
If that is the case, I would think you would continue to use the carb dizzy, as the 87 SPFI dizzy has no vac advance.. is crank angle sensor type...
As far as Timing goes.. you will just have to experiment. SPFI timing on an 87 is 20btdc. I'm sure that this is in part because of the higher compression. Personally, I would advance it until it pings, then just back it off a touch.. you can put a light on it later to see what the number is
Posted 05 September 2003 - 10:48 PM
Might be interesting to see what he could add to this thread re: advance and wiring done...
dunno if he just plugged the carby advance port, and screwed her down? Maybe put a carby disty in it when said and done-
Posted 06 September 2003 - 01:23 AM
the carb dist wil work too, but i think you will need one from an 85-86
i tried yo use one from an 87,(ea82 in 82 glf) had no spark, and oh noah(cis subaru) suggested an 85 or 86 dizzy
all the conversions i have done used an 86 dizzy
right now i have an spfi motor with a carb down in a turbo wagon, and the 86 dizzy works fine connected with its 2 wires to the turbo's coil.
if i get bored i can try to use the turbo dizzy and se if it will work without the mpfi intake harness and see if that works!
but what i am talking about is a carb doen in a spfi or turbo car
if using the spfi block with a carb in a carb car, then you will need the carb disty. if the disty is the one from the car, then it should work. fuel pump swaps need not apply
you would probably want to use the carb spec 8deg. btdc.
but go ahead and try spfi's 20deg btdc (if it has to do with the compression ratio)
Posted 06 September 2003 - 01:37 AM
Posted 06 September 2003 - 02:15 PM
let's try this:
I am working on a carbureted 87 wagon with a swapped in SPFI long block.
I'm using the original carbureted distributor the car came with.
Should i use an SPFI distributor even though i still have the original intake, wiring, carb, etc?
When I was just getting the rotor/distributor gear in sync with the cam, I found that turning the dist all the way counterclockwise ran best so far, but it seemed a little better maybe if i toook out the distributor bolts and turned it a little past the ears it bolts to on the head.. but if I turned the rotor/gear CC one tooth and then rotated the distributor all the way clockwise, it wouldn't run. I was under the impression that rotating the distributor a tooth and turning the adjustment back the other way on the ears accomplished the same thing?
Posted 06 September 2003 - 03:31 PM
Posted 06 September 2003 - 07:48 PM
OK. i can always "booty fab" a bracket or something from the hardware store if i have to turn it past the ears.
make sure the vacuum advance holds vacuum.. by putting a clean hose on the VA and pretending it's a glass of soda? if i can draw air through the VA it must be bad i'll guess?
Posted 06 September 2003 - 08:17 PM
Sorry, I couldn't stop my fingers.
Posted 06 September 2003 - 10:07 PM
Posted 07 September 2003 - 08:21 AM
I had a weird dream that my town's gas station put the gas price up to $8.38 a gallon for all three octanes. Weird huh?
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