Wildguzzi.com
General Category => General Discussion => Topic started by: drlapo on January 11, 2016, 05:40:23 PM
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I've been reading about the 650 Lario
4 valve heads. 60 hp. 379 pounds
Why did they abandon 4 valve heads for the small blocks?
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I've been reading about the 650 Lario
4 valve heads. 60 hp. 379 pounds
Why did they abandon 4 valve heads for the small blocks?
They all went bang .
Dusty
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Oh, that is not a good sound
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You might think, at first glance, that Dusty was just being snarky with his comment...not entirely so. The Lario 4V head had a bad habit of snapping a valve stem, with an awful outcome. Others here, with much more experience, can give you more details. Guzzi must have figured out the solution because they sold a similar engine for aircraft use and that seems to be a real winner. Chuck in Indiana is the go to person about that project.
Peter Y.
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Yeah Peter , wasn't trying to be snarky . Oh , the aero motor is a two valve .
Dusty
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You might think, at first glance, that Dusty was just being snarky with his comment...not entirely so. The Lario 4V head had a bad habit of snapping a valve stem, with an awful outcome. Others here, with much more experience, can give you more details. Guzzi must have figured out the solution because they sold a similar engine for aircraft use and that seems to be a real winner. Chuck in Indiana is the go to person about that project.
Peter Y.
As far as I know, Guzzi never did figure out the small block 4 valve, or anyone else, either.
Mike Wrenn has built a 4V nuevo small block, and Todd Egan is working on a big cylinder 4V small block.
I'm not convinced. :)
The Aero engine is what Guzzi replaced the 4V with when they needed more horsepower. It's a hemi with huge (2) valves. Flight proven with thousands of hours.
Makes a good sport tourer out of the Lario.. ;)
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Easy for you to say Chuckie :grin:
Dusty
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Easy for you to say Chuckie :grin:
Dusty
I was speechless. :smiley: I thought everyone knew about the SB 4V issues by now. It's a shame, the 4V Lario is just a hoot to ride. Mine made it 5000 miles before wiping a cam lobe. :violent1: It sounds vaguely familiar.. what with all the big block 4V problems now. :evil: :wink:
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I wonder why the new heads on the V9 don't make more HP
Maybe it's all about torque now
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I wonder why the new heads on the V9 don't make more HP
Maybe it's all about torque now
Mostly so they don't go bang .
Dusty
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My son's1970 triumph 250 went bang: the intake valve head dropped off
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.....what happened to the Kevdog and his super Lario?
Go bang?
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.....what happened to the Kevdog and his super Lario?
Go bang?
I was wondering about Kevdog myself . Where are ya Kev ?
Dusty
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I was wondering about Kevdog myself . Where are ya Kev ?
Dusty
Yeah, me, too. 4V *and* DLC. :popcorn:
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....and IceBlue. He hasn't posted since 02/'15. IIRC, he knows his way around a Lario.
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....and IceBlue. He hasn't posted since 02/'15. IIRC, he knows his way around a Lario.
Maybe he and Kevdog are off somewhere plotting an evil plan to corner the Lario market worldwide. :evil:
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Maybe he and Kevdog are off somewhere plotting an evil plan to corner the Lario market worldwide. :evil:
Bill , that should be easy , only about 8 of them didn't go bang :evil:
Dusty
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Bill , that should be easy , only about 8 of them didn't go bang YET:evil:
Dusty
FTFY
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FTFY
:laugh: :shocked: :laugh: :shocked: :laugh: :shocked:
Dusty
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They would keep the heads on the valves if you stayed 1000 rpm from the redline. Most owners can't control themselves. Like a junkie w/a habit.
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They would keep the heads on the valves if you stayed 1000 rpm from the redline. Most owners can't control themselves. Like a junkie w/a habit.
That last 1000 rpm is where it's at with the Lario.. or ahem.. way beyond. Mine hit the redline every time I took it out. If you can't use it, what's the use of it? :evil: :wink:
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So did Sergio's, they went boom.
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Dog's in the house. Been away for awhile. Super Lario is running (well...) Super. Kibble white valves, DLC coated cam/followers. Get rid of junk valves that came stock and give it a stinkin' chance. Cam issues yes. Time will tell. Mine has good low end so no NEED for redline. This will help.
-K
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Hey KD , where have you been bud ?
Dusty
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Hey KD , where have you been bud ?
Dusty
Truth be told... chasing tail. :evil:
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Truth be told... chasing tail. :evil:
Hopefully not your own :grin:
Dusty
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I've got my buddies Lario on the bench in my shed, installing KIbblewhite valves and a rev limiter.
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does kibblewhite list those valves?
or are these special valves made to order?
i've got my lario engine on the bench, dropped a exhaust valve :angry:
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does kibblewhite list those valves?
or are these special valves made to order?
i've got my lario engine on the bench, dropped a exhaust valve :angry:
Yeah....inquiring minds want to know...and are stem caps used?
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:evil: :smiley:
http://www.engadget.com/2015/12/29/us-army-retires-first-drone/
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Just thought I'd pitch in on this old Lario string. Yeah - unmodded Lario's goes bang. I'm still riding mine with the mod often listed here. Restored another one last year with the same mod and riding her this year you yank out all hidden quirks.
A set of quality valves - Stein Dinse has good ones, a cam shaft with 14mm lobes and V7/Nevada progressive springs. I'm beyond Chucks 5000mile marker and my lobes look like new ones, and the mill spins up to 8000 rpm like a bat out og H***.
Not to start and oil string, but that IS important to a Lario and all other OLD SB's.
The word here in Europe among SB Guzzista are 20W50 or 20W60 with a viscosity index of minimum 150 and maximum 200. Closer to 200 than 150 is best. Important to the lobes and the oil pump, which seems to lose efficiency in the old SB's if the index is too low. Cam lobes does not like it either.
GuzziTech's V7 4V heads use the V7 progressive springs too. I think that counts for the choice. Give me a shout if you want to rebuild a Lario. I have a small document with the parts needed for the valve train rebuild.
Like Chuck said, it's one fun bike to ride on the twisties. Don't take her beyond 100Mph - then she gets a bit too lively - small 16" wheels base you know :grin:
Ciao
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Just thought I'd pitch in on this old Lario string. Yeah - unmodded Lario's goes bang. I'm still riding mine with the mod often listed here. Restored another one last year with the same mod and riding her this year you yank out all hidden quirks.
A set of quality valves - Stein Dinse has good ones, a cam shaft with 14mm lobes and V7/Nevada progressive springs. I'm beyond Chucks 5000mile marker and my lobes look like new ones, and the mill spins up to 8000 rpm like a bat out og H***.
Not to start and oil string, but that IS important to a Lario and all other OLD SB's.
The word here in Europe among SB Guzzista are 20W50 or 20W60 with a viscosity index of minimum 150 and maximum 200. Closer to 200 than 150 is best. Important to the lobes and the oil pump, which seems to lose efficiency in the old SB's if the index is too low. Cam lobes does not like it either.
GuzziTech's V7 4V heads use the V7 progressive springs too. I think that counts for the choice. Give me a shout if you want to rebuild a Lario. I have a small document with the parts needed for the valve train rebuild.
Like Chuck said, it's one fun bike to ride on the twisties. Don't take her beyond 100Mph - then she gets a bit too lively - small 16" wheels base you know :grin:
Ciao
Good to hear from you, Iceblue! Don't be such a stranger.
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Some will never be a believer even if they use logic (i.e. quality parts). Mine is fine. No need for redline; pulls good down low.
-dog
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Good to hear from you, Iceblue! Don't be such a stranger.
I'll be more present I prommis leaf :thumb:
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Some will never be a believer even if they use logic (i.e. quality parts). Mine is fine. No need for redline; pulls good down low.
-dog
I guess you are right Kev!
I always found her quirks to be a challenge to be fixable. One way or another.
So far we both have a soluiton IMHO.
Ciao
Ice