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General Category => General Discussion => Topic started by: hidn45 on April 11, 2017, 11:53:05 AM

Title: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: hidn45 on April 11, 2017, 11:53:05 AM
392 cc homebuilt V-8 motorcycle

https://www.youtube.com/watch?v=IzDKehAHNM4

(Hope that worked)

What a sound!
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: twowings on April 11, 2017, 12:21:47 PM
What a jewel!   :bow:
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: fotoguzzi on April 11, 2017, 12:51:02 PM
Wow nice! Is there a write up anywhere about it?
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: JJ on April 11, 2017, 01:07:27 PM
Cool beans!!  Truly a work of art and craftsmanship!  The FRANZ FLYER!!  Thumbs up all around!!  :thumb: :cool: :1:

Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Matteo on April 11, 2017, 04:10:23 PM
Sweet :bow:
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Antietam Classic Cycle on April 11, 2017, 04:25:50 PM
Very cool. I wonder how/why he decided on the displacement? Maybe he figured that displacement would produce just enough hp, but not too much for the (BMW /2?) transmission.
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Triple Jim on April 11, 2017, 04:30:33 PM
Wow nice! Is there a write up anywhere about it?

I'd like to read some details too.  It almost has to be liquid cooled, but I don't see a radiator, for example.   He looks a little older than when he was on NYPD Blue.    :)
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Antietam Classic Cycle on April 11, 2017, 04:51:28 PM
Looks like he's built another:
(https://i2.wp.com/www.bike-urious.com/wp-content/uploads/Dennis-Franz-V8-Right-Side-Naked.jpg)
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: RANDM on April 11, 2017, 05:02:12 PM
Gobsmacked - that is one fine sound isn't it?

Maurie
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Chuck in Indiana on April 11, 2017, 05:24:48 PM
Well, that's a hoot, now..  :thumb:
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Muzz on April 11, 2017, 09:40:42 PM
I'd like to read some details too.  It almost has to be liquid cooled, but I don't see a radiator, for example.   He looks a little older than when he was on NYPD Blue.    :)

On another YouTube video he shows an air cooled V8. I suspect the rear pot(s) would get a bit hot on prolonged running.

Nice work though. :thumb:
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Vapiti on April 11, 2017, 11:35:05 PM
In the sixties a Finnish engineer named Tauno Nurmi built a racing bike with V8 engine. Totally his own design and build. Here's a link to short introduction by his grandson: http://vasaramaki.com/eng/2015/04/about-my-grandfather/
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: azguzzirep on April 12, 2017, 02:25:00 AM
Much more cool than a Boss Hoss!

I'd love to have a new bike that looks like that.
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: chuck peterson on April 12, 2017, 06:01:57 AM
 :popcorn: sarcasm abounds...

It'll never work, the tires are too skinny...

 :popcorn:
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: PeteS on April 12, 2017, 01:07:19 PM
This guy is a builder. He has also built a V Twin.

https://www.youtube.com/watch?v=s39AYkooNYM

Pete
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Gliderjohn on April 12, 2017, 05:39:05 PM
Dennis is an amazing talent. He lives about 10 miles from me and I run into him ever so often. First time I met him was when I saw a Guzzi I didn't recognize outside a convenience store in Newton, KS where he is from. He has also built a diesel bike in a Guzzi frame. Below is two videos of running model tractors that he has done.

https://www.youtube.com/watch?v=tNOPHpdu4LA
https://www.youtube.com/watch?v=gzrhQfcf5DM

GliderJohn
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: PeteS on April 12, 2017, 06:13:44 PM
Dennis is an amazing talent. He lives about 10 miles from me and I run into him ever so often. First time I met him was when I saw a Guzzi I didn't recognize outside a convenience store in Newton, KS where he is from. He has also built a diesel bike in a Guzzi frame. Below is two videos of running model tractors that he has done.

https://www.youtube.com/watch?v=tNOPHpdu4LA
https://www.youtube.com/watch?v=gzrhQfcf5DM

GliderJohn

John, do you know if he makes his own castings or is everything machined?

Pete
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: wymple on April 12, 2017, 06:29:38 PM
Very cool. I wonder how/why he decided on the displacement? Maybe he figured that displacement would produce just enough hp, but not too much for the (BMW /2?) transmission.

Perhaps a reference to the 392 Hemi ?
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Gliderjohn on April 12, 2017, 06:38:14 PM
From PeteS:
Quote
John, do you know if he makes his own castings or is everything machined?

Pete

Don't quote me on it but I think he machines but does not cast. May be wrong. Have to remember to ask.
GliderJohn
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Antietam Classic Cycle on April 12, 2017, 06:48:58 PM
Perhaps a reference to the 392 Hemi ?

After a little calculating, it comes to 49 cc per cylinder. That's a good size for lots of off-the-shelf pistons...
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Arizona Wayne on April 13, 2017, 01:25:44 AM
OK, guys, let's be honest, are we looking at kits these guys buy, put together and make run, or do they build them from scratch?  :huh:

I'd love to hear what a Motobecane 850 V8 w/shaft drive sounds like.  :smiley:
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Antietam Classic Cycle on April 13, 2017, 08:42:42 AM
OK, guys, let's be honest, are we looking at kits these guys buy, put together and make run, or do they build them from scratch?  :huh:

I'd love to hear what a Motobecane 850 V8 w/shaft drive sounds like.  :smiley:

There are no "kits" to buy, Dennis Franz is building mostly from scratch with a few off-the-shelf components (such as pistons?) I expect.

Motobecane? Don't you mean Morbidelli?

(http://m1.i.pbase.com/u33/coreyl/upload/21649251.MorbidelliV8.jpg)
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Arizona Wayne on April 13, 2017, 10:59:01 PM
Doh.............thi s is the 2nd time I called a Morbidelli bike a Motobecane.  :rolleyes:  Yeah that's the 1 I'm referring to.

BTW, Morbidelli senior's son? races in Moto 2 and he's won the last/1st 2 races this year.  :thumb:
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: Gliderjohn on April 14, 2017, 05:03:18 PM
I think that he used Honda pistons.
GuzziJohn
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: oldbike54 on April 14, 2017, 05:21:14 PM
I think that he used Honda pistons.
GuzziJohn

 OH NOES , it's a rice burner  :grin: Just kidding , the guy does amazing work  :bow:

 Dusty
Title: Re: not a Guzzi V-8 - Dennis Franz's homebuilt
Post by: jbell on April 15, 2017, 01:00:11 PM
Unbelievably brilliant execution.  I'm having conniptions trying to do rearsets on one of my bikes and he builds complete motorcycles.  Anybody know a good online self esteem class?