• Welcome aboard HomebuiltAirplanes.com, your destination for connecting with a thriving community of more than 10,000 active members, all passionate about home-built aviation. Dive into our comprehensive repository of knowledge, exchange technical insights, arrange get-togethers, and trade aircrafts/parts with like-minded enthusiasts. Unearth a wide-ranging collection of general and kit plane aviation subjects, enriched with engaging imagery, in-depth technical manuals, and rare archives.

    For a nominal fee of $99.99/year or $12.99/month, you can immerse yourself in this dynamic community and unparalleled treasure-trove of aviation knowledge.

    Embark on your journey now!

    Click Here to Become a Premium Member and Experience Homebuilt Airplanes to the Fullest!

Search results

Find deals on ebay
Advertise with us
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
  1. J

    Formula-I?

    I would instead consider getting an engine (and maybe series) sponsor (looking at you Rotax), 100hp simple engines that can be removed and installed within a few hours. You show up on the Friday, you have a pill draw, that # corresponds to a specific engine. That is your engine for the...
  2. J

    50 HP 5 CYLINDER RADIAL WITH PREDATOR HEAD/CYLINDERS

    Somewhat related, but a homebuilt 2 stroke radial engine, built from snowmobile jugs. It would sure make life a lot easier without having to worry about valvetrain.
  3. J

    50 HP 5 CYLINDER RADIAL WITH PREDATOR HEAD/CYLINDERS

    Well, a 2 piece bearing is going to be real tough to assemble, I would look in to something like a one piece cam bearing. You will also need to figure out something to control thrust as well. Maybe something out of an industrial diesel. What prop flange are you designing for? I feel like that...
  4. J

    50 HP 5 CYLINDER RADIAL WITH PREDATOR HEAD/CYLINDERS

    I think you are in for an uphill battle trying to physically assemble the engine using a chevy 2 piece rear main seal style crankshaft. As i mentioned previously, the Ford has a 1 piece rear main seal. The later GM's also had a 1 piece rear main, but not in a 3" stroke. If starting from an...
  5. J

    50 HP 5 CYLINDER RADIAL WITH PREDATOR HEAD/CYLINDERS

    Not off the top of my head, might want to look in to the 4.7 or 5.2 dodge magnum engines, or maybe the Toyota UZ family of V8's. I think you are on to something with 1/4 V8 crankshaft though. Most production V8 eschew proper counterweights on every crank throw and instead place the bulk of...
  6. J

    50 HP 5 CYLINDER RADIAL WITH PREDATOR HEAD/CYLINDERS

    Well they exist in the aftermarket forged, I don't think they existed in the factory form forged unless it was the Boss 302 cars from 69-70. Those cranks are really, really rare nowadays.
  7. J

    50 HP 5 CYLINDER RADIAL WITH PREDATOR HEAD/CYLINDERS

    Also, 283 crankshafts may be difficult to source nowadays. There are likely plenty of other crankshaft donors out there around the 3" stroke mark. Ford 302 is one, and there are plenty of those hanging around. The other benefit of the Ford is that is is set up from the jump with a 1 piece...
  8. J

    50 HP 5 CYLINDER RADIAL WITH PREDATOR HEAD/CYLINDERS

    I think a pressurized hydrodynamic bearing is going to be far superior to a ball or needle bearing, for something like this. Yes, I know the germans used them in ww2, but that was more due to the lack of availability of materials to build proper hydrodynamic bearings out of then technical...
  9. J

    50 HP 5 CYLINDER RADIAL WITH PREDATOR HEAD/CYLINDERS

    There's a lot to admire in that video, but I don't think I'd fly behind it either. If you are determined, you can find a way forward!
  10. J

    50 HP 5 CYLINDER RADIAL WITH PREDATOR HEAD/CYLINDERS

    Pertinent to the discussion:
  11. J

    50 HP 5 CYLINDER RADIAL WITH PREDATOR HEAD/CYLINDERS

    Another something to think about, has anyone considered just doing a single common crankpin with the cylinders offset front to rear axially by the width of each rod journal? This is how that aussie 3 cylinder is done, using what looks like off the shelf LS parts. That would allow you to use...
  12. J

    50 HP 5 CYLINDER RADIAL WITH PREDATOR HEAD/CYLINDERS

    FWIW, when I raced 4 cycle karts (many years ago), it was common to have a fixture used to "twist" the camshaft to advance or retard it. Fairly simple to do on cast camshaft cores that are standard fare on these engines. Basically a pair of angle iron plates with a plug that held the cam...
  13. J

    More V-12s

    There is always the split pin crank option. Not a favorite option but it is a way to get even firing orders on an odd bank angle. VAG use this to devastating effect on their V10's in the Hurracan and the R8, which are 90 degree bank angle, but 72 degree firing angle (like any proper V10 should...
  14. J

    More V-12s

    If you are asking me, I am talking about the classic Jag V12, ala existing in the 70's 80's and 90's. It is the basis for a couple of LeMans and IMSA winning Prototype engines from that era, namely XJR6, 8 and 9;s in the mid to late 80's. As a kid knocking around Sebring and Daytona in that...
  15. J

    Dual SDS ECU's - T-51B

    Thinking about it some more, the engine an doesn't really know what's firing the injectors or coils so on an LS could run 1,4, 6 and 7 off one ECU and 8,3,5, and 2 as as two even fire 4 cylinders, although they would be cross bank. Theoretically speaking each cylinder is ingesting the same...
  16. J

    Dual SDS ECU's - T-51B

    Curious to know how SDS handles this as well. In a V12, or a flat-plane V8 you can run 2 separate controllers, one on each bank and be completely independent. Hell you might be able to compensate for what would be the weird firing order of a cross-plane V8 with 2 ecu's. I never really thought...
  17. J

    More V-12s

    That JAG V-12 is heavy! I have one I picked up to make a coffee table out of. The Merc V12's are interesting, The M120 is the big boy used as a basis for the Pagani supercars as well as Merc's own autobahn cruisers of the late 90's through the early aughts. It was replaced by the M137 v12...
  18. J

    Yamaha Out of Snowmobile Production by 2024/2025

    The TR-1 engine which is a base model/lower cost engine option appears similar to the 998T, although it is 1049cc. The high perf skis are based on their 4-cylinder engine. All the ski engines appear to have water cooled exhaust manifolds, so not sure how applicable those engines might be for...
  19. J

    Yamaha Out of Snowmobile Production by 2024/2025

    It appears that the Yamaha YXZ side by side engine is from the same family as the 998T, just in NA form. Plenty of guys making big power with those with aftermarket parts, so maybe the sky isn't falling just yet. Not sure what the PTO situation is, but I am sure a workable solution can be...
  20. J

    Cub crafters EDF?

    This came up in my feed today, not sure if it is just a push by CC to up investor interest or what. Curious what the entire contraption weighs. CubCrafters Unveils Ducted Fan Leading Edge Slats - KITPLANES
Back
Top