Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

HB 20 Racing engine??

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Old 12-30-2004, 02:44 PM
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happyal
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Default HB 20 Racing engine??

Has anyone ever heard of this make and model of engine?

It's in a small pylon racing plane that I'm thinking of buying. Any help would be good, because I've really never heard of this engine.

Thanks
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Old 12-30-2004, 07:45 PM
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Warjet
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Default RE: HB 20 Racing engine??

HB engines were made in West Germany up until about 1990, then closed down. RJL Industries in Los Angeles bought the rights and the tooling and make the 40 and 61 models. When alive, HB's came in .12, .15, .20, .21 (Grand Prix car and plane), .25, .40, .50, and .61. The 20,25,40 and 61 were also made in PDP (Perry Directional Porting) configuration (more ooommph). Look on the mounting flange and see if the letters PDP are engraved on the left one. I have 26 of these engines in all sizes except the .50, am saving 4 new 25's for a Royal B-17 that's in various stages of construction. Others might disagree, but these were (are) great engines and I buy everyone I can find in good or new condition. The Grand Prix's have a much larger cylinder head and were made for high RPM's, could be what you have. Good Luck!
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Old 12-30-2004, 08:14 PM
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Default RE: HB 20 Racing engine??

Hey Warjet,

I have a NIB HP 61 (Hirtenberger), were these made by the same Co.? In the manual, they show a HP .20 Aero (2500-24000 rpm), a HP .20 Auto Cross (3000-28000 rpm), and a HP 20 High Speed (3000-30000 rpm) .

Sounds like they are either the same, or at least cousins. [sm=confused.gif]

Flashman, do you have a pic?
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Old 12-30-2004, 09:14 PM
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Default RE: HB 20 Racing engine??

HP's were made in Austria, different company back then but another that RJL in LA has aquired. I have their 40 and 60 Gold Cup 2 strokes as well as their rotary valve 49 4 stroke. Godd engines, not powerhouses for sure. Their claim to fame is HP was the first mass-produced schneurle scavenged (I think). The 2 strokes are good runners, very light for their displacement (40 will fit easily in a 25 sized plane weight wise with more power).
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Old 12-30-2004, 11:04 PM
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Default RE: HB 20 Racing engine??

Thanks, the 61 I have is also the Gold Cup. Never been run, but have it set up with a Rossi pipe. Now all I need is a plane for it.
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Old 12-31-2004, 03:45 AM
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Default RE: HB 20 Racing engine??

ORIGINAL: FI_Flashman

Has anyone ever heard of this make and model of engine?
Here's a pic of the ‘vintage’ 1986 HB.21 Grand Prix engine (Helmut Bernhard Feinmechanik ). It’s a good performer and will turn up to 26K reliably. The price was about 150 bucks. But spare parts no longer available!

Like the MVVS engine series the cylinder of this HB engine can be switched between side and rear exhaust configuration. That typically has to be done before the very first run of a brand new engine to establish an optimal piston/liner fit for ultimate performance. The rear exhaust configuration provides best output.

P.S. The ‘cheapo’ MVVS .21 being modified will turn even higher rpms without probs. No spare parts problem here.
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Old 12-31-2004, 06:00 AM
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Default RE: HB 20 Racing engine??

Thanks guys.

Lots of good information for me. I think I'll buy the plane with this engine on, then I'll post a pic for you to lok at (If someone can help me by telling me how to post a pic). The engine looks a little different to the pic above.

It looks smaller, is very round and has a red top, the carb looks smaller too, it does not look to be as square. Also it is side exhaust with a normal looking exhaust.
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Old 12-31-2004, 06:19 AM
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Default RE: HB 20 Racing engine??

Well if the cylinder case and head is not square it is definitely no stock GRAND PRIX engine - maybe modded to safe weight...

You should post a jpg-pic before buying something unknown. Just clic 'reply' + 'File Click here to upload!'

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Old 12-31-2004, 07:35 AM
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Default RE: HB 20 Racing engine??

This is the picture of the HB 20 installed in the front of the plane that I am thinking about buying.

Thanks
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Old 12-31-2004, 08:12 AM
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Default RE: HB 20 Racing engine??

OK, this is the 'normal' HB engine. 70s engine technology. Only little if not suited for speed application (timing + porting too tame). [:'(]

http://www.mecoa.com/hb/index.htm

Hope this helps
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Old 01-01-2005, 04:12 AM
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Default RE: HB 20 Racing engine??

Concur, that is an older 20 from the 70's. I'd be worried about the carb-it isn't the black plastic ones that I've seen on all previous HB's. Have you run the engine yet?
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Old 01-01-2005, 09:47 AM
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Default RE: HB 20 Racing engine??

Hi!
Its an old HB from the mid seventies...not too good in my opinion. Sorry!
Could be ringed or just lapped piston...doesn't really matter though. Definitely not made to go fast.
Carb is a Perry(US made)!

Regards!
Jan K
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Old 10-20-2014, 09:29 PM
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I have this engine if interested.
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Old 12-05-2014, 02:12 PM
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the square finned HB is the .21 grand prix engine and was aimed at the car market, along with pylon .21...25k rpm was normal for car usage. its a stout engine...use it and have fun...please use a tuned pipe...a 7x6 apc is the right prop for it.
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