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-   -   Engine parts list & ideas help please..... (https://vansairforce.net/community/showthread.php?t=131000)

aerhed 10-27-2015 08:49 PM

If you bought a kit motor it would come down to verification and assembly. Pretty easy. If you rebuild a core you should send almost all lower end internals to good shops for rework. New cylinder assemblies would be valved, so ring set-up, valve lash and rockers would be the only thing on top. Stay near stock and your odds go up. Like Paul said, there are lots of assembly tricks, but the OH manual has most of them if you really look. Parts matching on the common models is pretty easy.

bret 10-27-2015 09:57 PM

Been an ASE cert master tech in med heavy truck, auto, bus, engine machinist, alt fuel, X1, refrigerant, and advanced level L1, L2 the last three decades, one thing I've learnt is, you never know everything, in fact the more I learn, the more I descover What I don't know! So, What else has anyone seen worth mentioning? Rod bolt stretch preferred over tq? Anyone correcting rocker arm geometry with pushrods length and adjustable roller rockers? I read about an ocational valve sticking, any thoughts on why?

rhill 10-27-2015 11:07 PM

Another Great book added to Post #14
 
Bret, Its has been a little slow on here of late.At first you had me scratching my head as to "what are you up to?"So How about this an IO-360 angle with metal CS prop weighs what 360 to 400lbs an IO-720 has a listed weight of 595 pounds if you strip it down to crank,case,cam. use those new all aluminum cylinders,Carrillo rods,slipper pistons,Custom make the sump&intake out of carbon fiber&aluminum make it dry sump with the oil tank behind the passenger compartment for WB,you could knock off 200 pounds. Have Mr Cato work his magic on a 20 pound FP prop.Can you see the look on Vans face when he gets a load of this 400hp monster on the flight line at OSH.... Whats that noise,darn its the alarm clock,time to wake up come back to Reality.Your saving for an engine,right?Your a wrench,right? Buy a core,that's not a prop strike.Send everything out for yellow tagging.Build a reliable engine by the book.Your wife and kids need you and you don't want to hurt anybody else.You would never be happy till you build your own motor.How do I know this...Neither would I. So stop whacking the Hornets nest with that stick:)

bret 10-28-2015 06:02 AM

WHACK! that's funny right there, I would not be happy with a 360.....my Ducati Diavel does 0-60 in 2.6 not fast enough, so I put nitrous on it, still not fast enough. my boat has a set of 496s.......a 540 had crossed my mind, but hey, a 720? Hummm............

rhill 10-28-2015 07:13 AM

No matter how fast you go,you still have cruise time in the air.On a Saturday morning flying to a breakfast with 5 other ships,different models,different engines.The big engines get there a minute or two ahead of the 0-320s and the Rotax is five minutes behind.In fact the Rotax guys benefit from in flight weather reports. I bought a firewall forward off a 66 Mooney and went from there,Crank,Cam,Case tagged,everything else new.Its added years to my 7a build.I couldn't get over the $25K hump the engine represents.The kicker was,I'm a wrench also,I would never be happy flying someone else's engine.You have the "Need for Speed" build a Harmon Rocket.The 7a has too many concerns/restraints to stray from Vans design.IMHO
RHill

6 Gun 10-28-2015 07:22 AM

Engine
 
Just do what Bob Mills did put a IO-540 on the front and everything you can behind baggage compartment you get 300HP and the engine is not stressed and just loaf along at half throttle.
Bob


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