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Sailor Bob

Swapping to f54/p90

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Good day ladies and gentlemen, i havent logged in for a long time, but i think thats going to change to being the guy you're sick of hearing from. Im way up north in Newfoundland and i have a 73 that i tucked away in the back of my shed / garage 10 years ago and forgot about. Just retired-a couple of years ago and after clocking 100k miles on my bike im thinking of a more practical hobby. Long story short, I have a rebuilt f54/p90 modified with compression pumped up, ready to go carbureted. Most of the go fast gear sitting in boxes ready to be bolted on but not everything

im going to maintain her as a typical Z. Appearance wise other than engine and pipes.

at this stage im dismantling and scratching my head. Engine is out and the car looks pretty good. Trying to figure how much is transferable to the replacement engine. Thoughts and experience pointers welcome. If you know obvious considerations, please throw them out here for me to ponder.

ill stick in a few pictures of the state of affairs. 

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Does the P90 have carb manifold mounting holes?  You'll need the right gasket, not the L24 gasket, since you have injector cutouts in the head.

The P90 exhaust ports are rectangular so your L24 manifold might work.  Not sure if the rectangles are smaller on the smaller engine's exhaust manifold  though.  You'll want to measure.  People who know say that a more free-flowing exhaust system is the first best thing you can do to release some power.  Those small L24 exhaust pipes left hanging in your picture might need some changing.

I think that the rest of the parts, externally, are all swappable.  Looks like some fun.

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Hey ZH, i have some pipes and a header. Ill post a few pics of them, maybe tomorrow. I just eyeballed the intake manifold that i took off the original this afternnon, looks correct.

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Hi Bob, welcome back.

Your newly rebuilt L28 will drop in and fit perfectly with very few if any problems. As ZH mentioned you will have to rig the L28 Ex manifold or header to the other exhaust system.  Always a good idea to clean up the engine bay now that you have a chance.

We love lots of pics :beer:

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The fuel delivery pump will need some thought also. Your head won't accept a mechanical pump as it's cast. You could get a low pressure electric pump way cheaper than milling out the hole for a mechanical pump.

Always enjoy reading about a resurrection.

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Hi GK, thanks. I just ordered some stuff from Z Source. Good deal for mounts (two engine, tranny and a dif) $112. Next job is soap and water. Two weeks befor is see delivery ild say.

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Hi SUS, stuff a fella needs to know. Thanks. Lots of homework to do. Any recommended sites for new parts? 

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Wow Sailer Bob.....it’s been a while.......welcome back. I have a number of threads I’ve started on building the F54/p79 combo. Shaving the head and shimming the towers is the secret to getting performance from your set up.....flat tops also. I would make the cut out for the manual fuel pump.....you can always go either way if you choose. 

Guy

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Hey Guy, we’re on the same page on the head. Had it done years ago, brought it home from the machine shop and got lost in some other project. It sat in the garage wrapped in cellophane on a wood crate until yesterday. Anyway, back in the game. Fuel is one of the main issues. Cooling is the another, not sure if the old rad will do and there is nt really a standard for the hoses.  All in good time, no panic. Ill have a look through your threads see what i can find.

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The P90 should already have the hole for a mechanical pump, it's covered by a bolt-in blanking plate. Now is a good time to install a 10lb flywheel, you won't regret it. 😉

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22 hours ago, Sailor Bob said:

Yep, shes got a mechanical fuel pump aperture. Some pipes i found in the shed.

image.jpg

I've learned something here!  Thanks @LeonV and @Sailor Bob

I was going on the P79 I had that didn't have the hole for the pump, sorry.

And I agree with LeonV, my 10 lb. Tilton flywheel was the best upgrade for the money or "bang for buck".  My 2.4 revs like a motorcycle.

Works really well with a cheap Exedy 6009 clutch kit.

 

Edited by siteunseen

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6F3122B2-4131-40E3-931F-6816CAFD102D.jpegWaiting on parts. Other jobs that are less glamorous...

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Edited by Sailor Bob
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More interesting long forgotten stuff in boxes. Recieved from motorsport in 2009. Seems to be perfect.

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44 minutes ago, Sailor Bob said:

More interesting long forgotten stuff in boxes. Recieved from motorsport in 2009. Seems to be perfect.

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That sounds familiar! Have you been in my shop? 😛

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Trying to get the thermostat housing off the old engine. Enthusiasm snapped off the long bolt head and im guessing the bolt is rust seized. Perfect thermostat in it. Frustration is slowly turning to hammer time.

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