302 HO swap
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302 HO swap
Hello,new to the forum. I recently "inherited" my dad in laws 1986 f-150 w/ blown up 302 with FI. I bought a 302 HO from a 1990 lincoln mark vii. Is the only thing I have to do to make this work is change the intake manifold? what about the different firing order? my research on fordfuelinjection.com says that I have a speed density efi and the lincoln motor is also speed density. Is it just plug and play?
Postmaster
Joined: Jul 2003
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From: Pittsburgh
Something else to look out for is the imbalance on the flexplate. Bear with with me, but there are about to be alot of IF's coming out here.
I know that when you run a manual transmission, car and truck flywheels are different diameters. IF the same goes for flexplates, you're going to have to run your truck flexplate on the 302HO. Now, IIRC the 1986 f-150 uses a 28oz flexplate while the 302 HO uses a 50oz flexplate. This means IF the flexplates are different diameters, you'll have to find a 50oz flywheel that fits the truck transmission.
BUT, if the HO flexplate and the 302 flexplate are the same tooth count, ignore everything i've put up here.
Just figured i'd give you a heads up since i know a guy that put a 28oz truck flywheel on a 302 HO and promptly wiped all of the bearings out of it.
Justin
I know that when you run a manual transmission, car and truck flywheels are different diameters. IF the same goes for flexplates, you're going to have to run your truck flexplate on the 302HO. Now, IIRC the 1986 f-150 uses a 28oz flexplate while the 302 HO uses a 50oz flexplate. This means IF the flexplates are different diameters, you'll have to find a 50oz flywheel that fits the truck transmission.
BUT, if the HO flexplate and the 302 flexplate are the same tooth count, ignore everything i've put up here.
Just figured i'd give you a heads up since i know a guy that put a 28oz truck flywheel on a 302 HO and promptly wiped all of the bearings out of it.
Justin
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From: PA
Originally Posted by EPNCSU2006
You could bolt the stock truck intake on the lincoln engine and just change the spark plug wire order at the distributor. The truck computer should run that engine just fine.
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I was kinda hoping this would work.(from fordfuelinjection.com)
Injector Firing Order?
Firing order does not effect spark at the plugs because that is still determined by what order you put the plug wires on the distributor cap. But if you have a sequential fire fuel injection computer, then the computer program opens the injectors in the same order as the camshaft timing. This can cause issues when running a “High-Output” computer with an older camshaft. If you leave the injectors in the HO order you might notice a slight effect on idle quality. There are no effects once the engine speed picks up because the injectors open so fast.
Injector Firing Order?
Firing order does not effect spark at the plugs because that is still determined by what order you put the plug wires on the distributor cap. But if you have a sequential fire fuel injection computer, then the computer program opens the injectors in the same order as the camshaft timing. This can cause issues when running a “High-Output” computer with an older camshaft. If you leave the injectors in the HO order you might notice a slight effect on idle quality. There are no effects once the engine speed picks up because the injectors open so fast.
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The SD computer in my old '89 Bronco fired the injectors a bank at a time, bank to bank I think it was called. Keeping the computer in the '86 should also fire bank to bank. I could VERY easily be wrong, but it sounds like this should work for jostephy8.
When I did the engine on that truck, I had to do the mass air conversion to take care of the mods I did, that is where I read about the bank to bank thing. But this was in the '90s and so I am relying on a lot of memory, not the best thing for me to do sometimes
When I did the engine on that truck, I had to do the mass air conversion to take care of the mods I did, that is where I read about the bank to bank thing. But this was in the '90s and so I am relying on a lot of memory, not the best thing for me to do sometimes
Lead Driver
Joined: Nov 2002
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From: Concord, NC
Yep, the trucks are batch fired and use a single O2 sensor, so they are not nearly as sensitive as a Mustang or other sequentially injected engine to the different firing order. It is just as simple as installing the truck intake manifold and truck electronics and firing it up. I've heard of people having problems even still with the injector firing, but it's not hard to switch a couple around if indeed that is the problem. More often than not, the stock truck fuel injection works fine with the 302HO firing order.
Hotshot
Joined: Jul 2002
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From: Bend,OR
Originally Posted by 92f150I6
It's not that simple. The fuel injectors also won't fire properly. You would have to switch that also. Switching the injectors also runs into another problem, the computer won't be able to adjust the fuel mixture properly because it will be looking at the wrong O2 sensor values because you switched the injector order. What you really need to do is swap in a cam with a normal 5.0 firing order.
just install the truck stuff on the car motor, make sure the plug wires match the firing order of the cam and be done with it. simple really
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From: PA
Originally Posted by Kemicalburns
all incorrect on a batch fire speed density system in our broncos and f150's.
just install the truck stuff on the car motor, make sure the plug wires match the firing order of the cam and be done with it. simple really
just install the truck stuff on the car motor, make sure the plug wires match the firing order of the cam and be done with it. simple really
My bad. I read that when trying to put a non HO 5.0 into a mustang chassis using mustang components. I thought that the trucks used a similar fuel injection system to the mustang.