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Hidden Customization

Tonerjockey

High Miler
GT Contributor
Joined
Oct 28, 2008
Messages
788
Location
San Jose
Hmmmm let's see how THIS works...

1973 V7 Sport


Rollers_zpsaebgjr1f.jpg
 
Yeah, I've had these for several years. This is the first time I am trying them out. They seem to fit and operate OK.
Hopefully I won't damage these Mike Rich heads.

Alex
 
Being a fan of roller rockers from decades ago I was thinking about what it would take to retrofit a Griso 2V.

It's part of my Zero-Drag OCD mindset. Nothing like freeing up power for other things.
 
Rollers are great used them on my small block fords,Figure it out,would love to know.
Duc
 
good question phil.
I saw these in a picture over a decade ago. Several years later I was rummaging around at Guzzi Classics and found these. I don't know if they are the same pieces I saw in that picture so many years ago, but thought I'd give them a try.
They then aged on my shelf for years.
Since I wrote this thread, I've taken them back out of the V7 Sport race bike. I chickened out... that bike has a whole lotta effort (and $$$) wrapped up in it.
Alex
 
http://www.baisley.com/rocker_service.htm

These folks make roller tip rockers for Guzzi
Thanks for that brlawson. I had a feeling they were baisleys. Ive checked their site before but they dont have any Guzzi photos there.
The cost seems OK at 450us for the conversion but our exchange rate is so poor these days its a little expensive right now.
Would help with guide wear, but change the cam timing a little. Not enough to worry about though.
Ciao
 
I would like to find a roller cam, lifter and rocker for an old Guzzi... plus a roller crank ...
 
as I'm also a Norton Commando owner , I 've never had a problem with Guzzi valve guide or tip wear to warrant rollers. Nortons wear both considerably , due to really poor angles. What I wonder is all that extra weight put on the end of the rocker arm , that cant be good in a high performance / high revving motor? Seems contrary to me. High performance motors ? expect to replace the valves regularly , they will probably stretch anyway and keep rockers etc as light as possible. I also have a V7 sport , 36mm pumpers, flowed heads and the ol B10 cam , almost no flywheel, its lotsa fun. Keep on with news of the LSR , always enjoy hearing of mods and success or otherwise !

Dave
 
Hey Dave,
The Bonneville record I set in 750cc Production Class - Production Pushrod engine was beat by a Norton Commando. That bike looked really good.
 
as I'm also a Norton Commando owner , I 've never had a problem with Guzzi valve guide or tip wear to warrant rollers. Nortons wear both considerably , due to really poor angles. What I wonder is all that extra weight put on the end of the rocker arm , that cant be good in a high performance / high revving motor? Seems contrary to me. High performance motors ? expect to replace the valves regularly , they will probably stretch anyway and keep rockers etc as light as possible. I also have a V7 sport , 36mm pumpers, flowed heads and the ol B10 cam , almost no flywheel, its lotsa fun. Keep on with news of the LSR , always enjoy hearing of mods and success or otherwise !

Dave
The primary purpose of a roller tipped rocker is not about valve tip and guide wear its about transmitting the information from the cam lobe to the valve in a more accurate manner.
As the rocker foot in a normal rocker ( a la guzzi) moves across the valve stem it sweeps in an arc the extent of which is determined by the rocker ratio and the location of the rocker pivot in relation to the valve stem.
A roller tipped rocker actually goes same way to negating this phenomena. Not entirely but significantly. So the information from the lobe is more accurately transmitted to the valve as i said before.
Reduced side thrust and its effect on guide wear are a secondary gain.
This is why to gain the maximum benefit from the roller tipped rocker you need to modify the cam profile.

Ciao
 
Cheers Phil , Hi Alex,
Thanks i appreciate the explanation. I'm starting to get it , but then I've always been a slow learner !
I'm still of the standard Guzzi philosophy tho - less weighty bits = quicker power ! and as you say better accuracy always helps - top to toe but with Guzzi usually starts with re-setting the factory timing marks eh ! but now we need to work out how to get Alex's V7 sport back in to shape to do in that Notrun Commando at Bonneville ! crikey that Norton cant have had much original bits left in it !
dave
 
hehh heh Notrun indeed.

The V7 Sport did 127+ in 1.3 miles at El Mirage (Mojave desert) last year. If I can stop screwing with it we should be able to set a new one at Bonneville. 750 P-PP record currently held by Big D and that Norton, is 126.434 MPH at Bonne and that is with a 3 mile starting run.
Now we hafta wait for Bonneville to open again for racing... it's going on 2 years since the last trails there. Combination of wet and lost salt prevents racing on the salt.
Bonneville racing could be a thing of the past.
Alex
 
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