I found this engine in my box, any info would be great, HP .61

I have two of them, nice engine.
I think it's from 1966 or 67.

Yes that seems to be about right, a 1966 or 1967 vintage engine. HP was the first to commercially produce a Schnuerle Ported engine many years before anyone else did.
Ref: http://www.mecoa.com/hp/history.htm

IIRC the rear intake version came first...I believe that was around 1968-69...then shortly after came this front intake version w/ the round, screw-in backplate.
I would date this engine somewhere around '69-'70?

From what I understand, the round screw in back plate is kinda rare as it used to be a rear intake and was converted to front intake.

The original rear intake was left hand exhaust. You can see where the conversion comes from.

Thanks guys for the info, next month i'll fire her up,, if the weather is ok,,,,,,, i love when the neighbors think i'm crazy, they just don't get it,,,, WE DO.....

I've got an original owners manual for the HP .61... If you PM me your address I'll mail it to you.

Wow, that would be great, i'll try to figure out how to do that,, flyby50 Thanks....

If you want to send a PM (Personal Message ) just click on the PM icon on the bottom left of Broken Wings post...that will open a new window for you to send him the PM.

Thanks proptop,,,, i did see it after i replied to him, learn everyday !!!

You're welcome...we've got a good community of engine guys here in this forum.

It's in the mail...

[img]file:///C:/Dokumente%20und%20Einstellungen/Presario/Eigene%20Dateien/Eigene%20Bilder/Hirtenberger/HP61F_1970.JPG[/img]If you need any Info please write me...[img]file:///C:/Dokumente%20und%20Einstellungen/Presario/Eigene%20Dateien/Eigene%20Bilder/Hirtenberger/HP61F_1970.JPG[/img]

Here you see a Austrian Stamp with the old HP manufacture, long befor the engines in production...

My Dad was sponsored by HP from 1969 to 1977 and I have serveral HP engines.
I have some spare parts to, 30 polished 61 size mufflers among some of the spare parts:-)

I also has some instructions for the early models.

Joakim

Thank You for the goodies,,,, and thanks to all, you guys are great..........

But what does HP stand for ? Iwill give you a hint, the H is for Hirtenberger. And what is the translation?

HP = Hirtenberger Patronenfabrik (in german language) = Hirtenberger <span lang="en" class="short_text" id="result_box"><span class="hps" title="Zur Anzeige alternativer &Uuml;bersetzungen klicken">Cartridge </span></span><span lang="en" class="short_text" id="result_box"><span class="hps atn" title="Zur Anzeige alternativer &Uuml;bersetzungen klicken">(</span><span title="Zur Anzeige alternativer &Uuml;bersetzungen klicken">military</span><span title="Zur Anzeige alternativer &Uuml;bersetzungen klicken">) </span></span><span lang="en" class="short_text" id="result_box"><span class="hps" title="Zur Anzeige alternativer &Uuml;bersetzungen klicken">Factory
See here: www.hirtenberger.at</span><span title="Zur Anzeige alternativer &Uuml;bersetzungen klicken">

"Hirtenberg" ist a small Town in Austria. See here: www.hirtenberg.at
</span></span>

Hirtenberger Patronen or can stay for Hirtenberger Präzisionstechnik GmbH & Co KG . Founded in 1860.

See this link: http://www.hirtenberger.com/

HP engines was produced by: Hirtenberger Patronen- zundhutchen- & Metalwarenfabrik AG, Hirtenberg, Austria

Yea, the European guys got it .
It would be like Federal Cartridge co making glow engines.

Thanks Broken Wings, i received the manual for the HP .61,,, wow that was really great,,, flyby50....

Flyby,


From its external appearance; this engine seems to have a classic Schnürle porting arrangement, as originally introduced by Adolf Schnürle.

I.e. there are only the two angled side-ports; and the boost-port nearly all Schnürle ported engines now have, is not there (although it could be ground into the sleeve, but I doubt it).

mad dad has several HP 61s modified by George Aldrich they loved the 11x7 wood topfliites

The boost port is behind the HP 61 label. It is small by today's standards.

Perhaps you're right, Hugh.