OHC Guzzi

[Seagondollar]

Ennio Carraro of the Guzzi club posted these photos on Facebook about the last open house at Mandello.  Of interest to me where these photos of a true OHC big block twin Guzzi.

[Chuck in Indiana]

It's a small block..  ;D Very kool, though.

[Seagondollar]

Just heard that on FB.  Maybe there is hope for the small block V7 Sport in terms of HP!

[rocker59]

Love the belt routing.  Sure to keep the rubber properly warm.    :o

[LowRyter]

Love the belt routing.  Sure to keep the rubber properly warm.    :o

 ???

[jas67]

Love the belt routing.  Sure to keep the rubber properly warm.    :o

I was thinking they same thing.

Push rods work fine on (relatively) slow-revving V-twins (vs. high RPM inline fours), why add the additional maintenance items of cam belts if you don't have to?

[rocker59]

 ???

The cam belt routing is really close to the exhaust header, which would surely shorten the belt's usable life.

[Antietam Classic Cycle]

I was thinking they same thing.

Push rods work fine on (relatively) slow-revving V-twins (vs. high RPM inline fours), why add the additional maintenance items of cam belts if you don't have to?

IIRC, that bike revs to ~ 10k rpm, doubt it could do that with pushrods.

[Chuck in Indiana]

IIRC, that bike revs to ~ 10k rpm, doubt it could do that with pushrods.

If it could, it wouldn't for very long.. ;D

[Bob Wegman]

Harley 250 short stroke Sprints revved to 10,500 rpm.  Pushrod engine.

[Tom]

So all the work that's done to it.  What are the benefits?  Top end?  Reliability?  More Torque?  'cuz I have something that's different?  I think the latter.  :-*

[Antietam Classic Cycle]

So all the work that's done to it.  What are the benefits?  Top end?  Reliability?  More Torque?  'cuz I have something that's different?  I think the latter.  :-*

It's been posted here before and IIRC, the horsepower was around 100 and the whole bike was very light. I'd count those as a "benefits".  ;)

[Guido Valvole]

100 hp from a smallblock engine?!? Must be small horses… I *would* like to see the combustion chamber design as it looks to be SOHC with inline valves. Perhaps an improvement over Heron heads but not likely to produce 150-200 bhp/liter. Hey, even 50 or 60hp at the rear wheel and curb weight under 400 pounds could be major fun!
cr

[Tom]

It's been posted here before and IIRC, the horsepower was around 100 and the whole bike was very light. I'd count those as a "benefits".  ;)

I'd count those as benefits too until the next repair is needed.  ;D

[Chuck in Indiana]

I'd count those as benefits too until the next repair is needed.  ;D

I'd imagine that the guy that is capable of building it isn't too concerned about that.. ;D :BEER:

[rbond]

The only way that configuration would work, is to have the cams push directly down on the valves. There is no room for rockers, the ports would be 90 degrees to normal; exhaust coming out the side of the cylinder instead of the front, intakes going straight under the tank too. Still seems to be a Heron head, OHC setup does not improve anything to me. Just a new way to change belts more often.....

[Antietam Classic Cycle]

The only way that configuration would work, is to have the cams push directly down on the valves. There is no room for rockers, the ports would be 90 degrees to normal; exhaust coming out the side of the cylinder instead of the front, intakes going straight under the tank too. Still seems to be a Heron head, OHC setup does not improve anything to me. Just a new way to change belts more often.....

If the cam lobes were ground conical (not as outlandish as it sounds, the Aprilia Pegaso Cube had cams with conical lobes), then there could be a narrow valve angle.

In any case, I'm only relaying information I remember reading about it here on Wildguzzi in the past. Maybe someone has more information about it. I searched the web and came up empty.