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Author
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Topic: questions about rebuilt 351W FI
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CometGT1974
Gearhead Posts: 249
From: Asheville, NC USA
Registered: Jan 2002
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posted 01-21-2003 08:04 PM
   
Well, I just installed the newly rebuilt 351W back into my 89 F250 and was curious about a couple things before I fire it up. I did a basic .030" overbore rebuild with an OE style rebuild kit and a towing cam. I installed a set of 289 heads that I used to have on my race car, 1.85 Int. 1.55 exh. valves(Manley race-flo) the bowls have been ported and the exhaust has been hogged out, the intake runner has been cleaned up slightly. The cam is a generic towing cam, .424 int. .484 exh. lift w/ 204/214 duration. I took all the smog stuff off and am running a set of flowtech long tubes into 2.25 duals w/ flowmasters. I'm wondering how this thing is gonna idle?? If it will idle at all  ?? What should I expect as far as towing power, as opposed to stock?? Any surprises I should look out for?? Any advice/suggestions appreciated!!!
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MLariviere
Moderator Posts: 3578
From: Biddeford,Me.USA
Registered: May 99
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posted 01-21-2003 09:13 PM
Sounds good. Are you running an EFI?
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CometGT1974
Gearhead Posts: 249
From: Asheville, NC USA
Registered: Jan 2002
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posted 01-21-2003 09:23 PM
yes, stock fuel injection....only changes were the 289 heads, .030 overbore, the towing cam and the new exhaust system....I'm just curious if the fuel injection will be able to handle all these changes i've made and still maintain good driveability. I'm pretty sure this thing is speed density and i've always heard that SD doesn't react well to cam changes and head swaps....oh yeah, i'll be running 9.5:1 compression....
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SteveLaRiviere
Administrator Posts: 36138
From: Saco, Maine
Registered: May 99
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posted 01-22-2003 08:35 AM
That's a mild cam, you'll be all set.------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
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CometGT1974
Gearhead Posts: 249
From: Asheville, NC USA
Registered: Jan 2002
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posted 01-30-2003 10:48 AM
This is gonna sound like a dumb question but I've just gotta ask....i'm gonna set the base timing on this engine tonight and I'm not sure i'm familiar with the correct way to do it so someone please tell me if this will be the correct way to do it. Aren't I supposed to unplug the wiring from the distributor and just line up the painted mark on the balancer with the timing pointer?? Doesn't that mark represent 10 deg. BTDC ??
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SteveLaRiviere
Administrator Posts: 36138
From: Saco, Maine
Registered: May 99
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posted 01-30-2003 06:09 PM
You need to verify the number 1 cylinder is at Top Dead Center because you need to make sure the plug will fire at the end of the compressions stroke. {remember, on a 4 stroke engine the timing mark is at TDC at the end of the exhaust stroke also} Take out the number 1 spark plug, plug your thumb over the hole and turn the engine over. You'll hear and feel the air rush out on the compression stroke, then you'll know you are using the right TDC.------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
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CometGT1974
Gearhead Posts: 249
From: Asheville, NC USA
Registered: Jan 2002
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posted 02-03-2003 03:43 PM
OK, here's the deal...I noticed that when I pull the little chip out to set the timing (sorry, can't recall the name of the "little chip") nothing changes whether the chip is in or out....so I peeled the tape back on the harness and there is a bare wire, so on the part of the harness that leads to the "little chip" there are two yellow wires and a bare wire w/ no insulation. The part of the harness that leads to the distributor looks intact. Any ideas what this bare wire is for and shouldn't the timing change when you put the chip back in?? Please help!!!
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SteveLaRiviere
Administrator Posts: 36138
From: Saco, Maine
Registered: May 99
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posted 02-03-2003 06:37 PM
Do you have it running?------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
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CometGT1974
Gearhead Posts: 249
From: Asheville, NC USA
Registered: Jan 2002
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posted 02-03-2003 07:20 PM
yes, it is running....seems a little sluggish but is running smooth...idle is a little high. I'm not real familiar with these trucks or the EEC IV but it just seems to me like somehting is wrong with the timing or the timing advance.
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SteveLaRiviere
Administrator Posts: 36138
From: Saco, Maine
Registered: May 99
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posted 02-04-2003 12:02 PM
It does have to run a while for the computer to 'relearn' it's parameters. Are all the sensors hooked up ok? Have you scanned it for codes yet?------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
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CometGT1974
Gearhead Posts: 249
From: Asheville, NC USA
Registered: Jan 2002
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posted 02-14-2003 08:53 AM
Well, it's not the S.P.O.U.T connector or the ignition module...the computer is currently at a friends and he is testing it. If it is not the computer then it must be in the wiring harness!! Is there something in the distributor that could cause one not to advance?? Can someone explain this "Hall Effect" thing to me??
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CometGT1974
Gearhead Posts: 249
From: Asheville, NC USA
Registered: Jan 2002
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posted 02-14-2003 08:56 AM
Oh yeah, I forgot to mention, I was talking w/ a technician down at the local ford dealer who I was told was "the man" on fords!!! I asked him a question that I already knew the answer to, I asked him if it were possible to put 63 289 heads on an 89 351W and he looked at me like I was crazy and said that it's not possible!!! Well, i've been driving the truck around for a couple weeks now, only problem is I can't get the damn thing to advance on it's own!!!! 
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SteveLaRiviere
Administrator Posts: 36138
From: Saco, Maine
Registered: May 99
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posted 02-14-2003 09:11 AM
The Hall Effect just uses the proximity of a magnetic field as a switching device, as opposed to an optically triggered device.------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
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CometGT1974
Gearhead Posts: 249
From: Asheville, NC USA
Registered: Jan 2002
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posted 02-14-2003 04:42 PM
My computer guy told me that he didn't have the equipment to test every part of the computer but he tested everything he could and it checked out OK. He said the he thought that it could be the MAP sensor....the only other place I think it could be is in the distributer or the part of the harness that leads from the computer to the distributer. A buddy and I are gonna test for connectivity in the spout circuit and were gonna test the MAP sensor this weekend, hopefully we can figure it out.
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CometGT1974
Gearhead Posts: 249
From: Asheville, NC USA
Registered: Jan 2002
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posted 03-07-2003 05:00 PM
The problem was in the wiring harness!! Come to find out there were two shorts in the wiring harness leading to the distributor, this was causing it to not advance the timing!! I'm glad this ordeal is over!!!
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SteveLaRiviere
Administrator Posts: 36138
From: Saco, Maine
Registered: May 99
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posted 03-07-2003 05:03 PM
It's always the last place you look! ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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