I don't have a budget. I can swing anything VW related but I'm not looking to freely blow money for the heck of it. I know what VW cost and it's all within my range I guess.RS Hoover said that all VWs no matter the size are limited by exhaust valve size. Horsepower is a good question. Stan Hall tried to get good numbers a long time ago and couldn't find any besides the factory.
what is your budget for an engine?
I'm sure they are fine--Joe Horvath makes very good parts (and engines). But they aren't (really) optimized for VW aviation use (they'd have smaller valves if they were). They also aren't inexpensive--$1000 for 4 cylinders-worth of heads with valves springs, etc is dirt cheap by aviation standards, but not by penny-pinching VW standards (a pair of GPAS heads, drilled for the extra plug, would be bout $760). And they have a funky extra hatch/panel/gasket that must be removed IOT get a wrench onto the lower plugs. They may be a good choice if you are building a "bleeding edge" VW engine, but might be an unnecessary expense for a more hum-drum build.Curious, I see nobody really mentions revmaster or their aviation heads anymore... Is there a reason?
"Larger?" The problem with all heads adapted from automobile use is that they can't be much larger (in footprint) than the cooling shroud in the VW auto. I suppose each fin could be thicker, and they could certainly have air passages free of flash, etc so the air goes through.Didn't the revmaster heads have larger fins? Wasn't that the whole claim to fame?
Wow Scrapper, I had that book, How to keep your Volkswagen alive for the complete idiot back in the 70's. It's a great book but someone borrowed it and I never saw it again. Also, I think Molt Taylor had a book about the VW.Ordered these two just now, should arrive tomorrow. This will be my reading over vacation in Florida which starts this weekend. Looking forward to studying.
What about a case from Scott Cassler? From what I understand owner of GPAS passed away, I may be confused though.
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LOL, Don't let someone borrow that book because that will be the last time you see it.Wow Scrapper, I had that book, How to keep your Volkswagen alive for the complete idiot back in the 70's. It's a great book but someone borrowed it and I never saw it again. Also, I think Molt Taylor had a book about the VW.
Pops, what would you do if you were me? I'm not sure of the HP of Steve Wittmans little V-Witt but I believe he ran it at a high rpm. I'm more interested in sport and reliability, not racing.LOL, Don't let someone borrow that book because that will be the last time you see it.
This is all good. I like the 1835 cc engine and think its a good compromise in power, reliability, cost, etc. Friend of mine used to have a Sky-Rader, same empty weigh, same wing area, etc with a 60 HP HKS engine that has a redrive, of the 60HP 1835 cc VW powered SSSC. I'm about 40 lbs heaver than he is. They had the same cruise speed at 75% power, same ROC , same take-off distance. So the 1835cc VW engine has to put out an honest 60 HP.
The SSSC performs so good with the 1835 cc VW engine, I always wondered what it would be like with the 75 hp 2180 engine. The 1835 cc engine hauled my 230 lbs up at 1200+ rpm with a cruise of 80 mph. Good STOL airplane, maybe if I keep a new SSSC even lighter in weight it well be even better.