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How to... This is the place where you can share how to do just about anything NOT related to vehicles! Can you repair your lawnmower? Can you install a garbage disposal? Can you make the best spaghetti sauce ever? Can you figure out Windows 7? Can you build a pine derby car? Can you assemble a bicycle? Please share your knowledge! |
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#21
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Thinking I might get it torn down this week. I've got a bit of off-time scheduled so I'd like to get a look inside.
I picked up an 89 F350 crewcab a few months ago with a "ran-when-parked" 460 that had an incorrectly installed front main and pan seal. Unknown miles but I didn't like all of the sludge and crud in the lower part of the engine when I had the pan off (as in it's a poster-child for the world of poor maintenance practices). Besides, the longer I stare at the EFI 460, the more I think that I don't want a boring 460 that can't handle a different cam or any major performance pieces due to the speed density system...and the best time to do the work is right now with the engine already out. I'd miss the ease of starting, but low 200s horsepower will suck!
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes. SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory! |
#22
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Nothing like having a brand new engine come apart.
Tore down the C8xx head and block engine today. It's a 460. It looks like it never made it through its first oil change. This should demonstrate the importance of correct/large enough ring gaps. Two of the cylinders will be perfect after a light hone and the rest will just get a crosshatch pattern. There is ZERO ridge. I'll buy a set of new pistons, some gaskets, and probably have it balanced. Then throw it back together and run it.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes. SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory! |
#23
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I spent some time today getting parts ready for the machine shop. Pistons are on the way along with headers and a cam.
Suppose .017" of ring gap might be not-quite-enough? ![]()
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes. SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory! |
#24
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Pistons and cam on the way.
Did a bunch of math and typing into Desktop Dyno and settled on a cam that will keep the BMEP happy (similar to stock but carry it past 2000 RPM) and make power past 4500 RPM if desired all while losing nothing down low. I also have to keep the torque at bay since the 5-speed input torque rating is already being pushed by the stock 460. I had to be picky with cam selection as this is a 10.5:1 engine and going "too small" or stock on a cam would really keep my dynamic compression in that 8.9-9.1 range and that's too much for pump gas. Anyhoo, once the pistons show up it's off to the machine shop and balancer.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes. SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory! |
#25
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For aftermarket stuff I just use whatever they recommend, especially for hypereutectic pistons. The expansion rate on those are slightly different then regular aluminum slugs. *Technically", some specs only call for 0.004" per bore inch, so in those cases a 0.017" end gap would be considered acceptable. At the end of the day, I'd rather be a tad larger gap than too small. As someone mentioned: If the gap is too big, only you will know. If the gap is too large, EVERYONE will know! ![]()
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Bill Cohron - The Mad Doctor ![]() ![]() ![]() Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997! (678) 890-1110 www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar! Bring back ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Much to my surprise, I'm actually quite enjoying Linux! ![]() |
#26
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I'll be running .029" due to the 4.442" bore and the formula of .0065"/in. on run of the mill "rebuilder" cast pistons. Better safe than sorry.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes. SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory! |
#27
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Everything is heading off to the balancer's shop on Monday afternoon. Here's a bit of trivia for you, too. I was a bit worried about what I was going to do about a flywheel. I've seen a few and done one with a 360/390 flywheel and FE starter but don't really want a Frankenstein just in case I ever sell it since it's not fair to the next guy.
Ford didn't put a manual in the F-Series/460 combo until '83-ish and by that time (since '79), all 460s were externally balanced. The harmonic dampers are all the same from '68-'97 so the crank spacers are where the difference lies. No problems there. The early flywheels (429 manual) are not the right size to use with the ZF 5-speed bellhousing so what's a guy to do? Buy the correct '89 460 flywheel and machine the cast-in counterweight off! I bought a Pioneer flywheel from Scummit and while it is new-in-the-box, somebody must have gotten a little ways into a similar project and returned it...the counterweight had already been milled off.....I would have used a lathe, but hey, it saved a few bucks! I let a Scummit rep know that their returns department needs to be a little more particular since somebody with an ACTUAL '79-later rotating assembly may have gotten it and installed it....then chased a vibration afterward.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes. SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory! |
#28
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Headers are supposed to be here today!
I'll have this thing running this afternoon....fingers crossed! So long as the cam survives break-in, I am SOOOOO excited to hear this thing run. Cam specs are pretty wild.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes. SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory! Last edited by cleatus12r; Fri, July 8th, 2022 at 10:27 AM. |
#29
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That aside, very exciting! Let us know how it goes. ![]()
__________________
Bill Cohron - The Mad Doctor ![]() ![]() ![]() Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997! (678) 890-1110 www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar! Bring back ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Much to my surprise, I'm actually quite enjoying Linux! ![]() |
#30
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First startup.
https://rumble.com/v1blpnp-breaking-...er-paint..html After running a while. https://rumble.com/v1blrxx-after-bre...-quality..html
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes. SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory! Last edited by cleatus12r; Sat, July 9th, 2022 at 12:48 AM. |
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