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 two valve 1200?

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steveb
Montanarolo
Montanarolo
steveb

Posts : 21
Join date : 2020-09-08

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PostSubject: two valve 1200?   two valve 1200? Icon_minitime1Fri Sep 18, 2020 11:32 pm

Did guzzi ever make a 2 vale per cylinder 1200 GRiSO?
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Oz1200Guzzi
Don Abbondio
Don Abbondio
Oz1200Guzzi

Posts : 4404
Join date : 2014-03-13
Age : 65

two valve 1200? Empty
PostSubject: Re: two valve 1200?   two valve 1200? Icon_minitime1Fri Sep 18, 2020 11:49 pm

no, only 1100. A 1200 Sport/Norge/Breva could possibly fit, or you could upgrade the internals to achieve the same, though others might know what and how easy it might be. I just have a 2V 1200 Sport...
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bahamazoo
GRiSO Capo
GRiSO Capo
bahamazoo

Posts : 1150
Join date : 2015-08-09
Age : 56

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PostSubject: Re: two valve 1200?   two valve 1200? Icon_minitime1Sun Oct 04, 2020 2:49 pm

"just" Tony..... scratch BB is part of the evolution of things, no?
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Oz1200Guzzi
Don Abbondio
Don Abbondio
Oz1200Guzzi

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Join date : 2014-03-13
Age : 65

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PostSubject: Re: two valve 1200?   two valve 1200? Icon_minitime1Sun Oct 04, 2020 2:59 pm

Well Pat, on this here forum, I have a lowly 2V 1200 Sport, like yourself. Others here have "GRiSOs", so only "just" a humble 2v 1200.
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GuzziSteve
Fra Cristoforo
Fra Cristoforo
GuzziSteve

Posts : 364
Join date : 2016-04-14

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PostSubject: Re: two valve 1200?   two valve 1200? Icon_minitime1Sun Oct 04, 2020 3:31 pm

A friend has 1200 barrels on his 1100 GRiSO, everything trimmed to fit.
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Pete Roper
GRiSO Capo
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Pete Roper

Posts : 7515
Join date : 2013-05-29
Age : 63

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PostSubject: Re: two valve 1200?   two valve 1200? Icon_minitime1Sun Oct 04, 2020 3:51 pm

What did he do? Deck the tops of the barrels by whatever the stroke difference is? Didn't it significantly change the compression ratio? I suppose it would of lowered it?
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GuzziSteve
Fra Cristoforo
Fra Cristoforo
GuzziSteve

Posts : 364
Join date : 2016-04-14

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PostSubject: Re: two valve 1200?   two valve 1200? Icon_minitime1Sun Oct 04, 2020 9:51 pm

Yes, cut the top. He's at 10.5 compression. 1200 heads w/sunk valves, pistons trimmed on top. It also has a cam I put in at the beginning, some years ago. The 1100 motor had high flowing Mike Rich heads that he'll put back on sometime. Quite the grenade, already touched a piston once. Been apart like 5 times. Some folks just got to tinker.
BUT it really hauls ass.
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Pete Roper
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Pete Roper

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Age : 63

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PostSubject: Re: two valve 1200?   two valve 1200? Icon_minitime1Sun Oct 04, 2020 10:03 pm

10.5 is bloody high for that combustion chamber but the second plug probably helps combat detonation.

Yeah, the old 2V motor is easy to tinker with.
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GuzziSteve
Fra Cristoforo
Fra Cristoforo
GuzziSteve

Posts : 364
Join date : 2016-04-14

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PostSubject: Re: two valve 1200?   two valve 1200? Icon_minitime1Sun Oct 04, 2020 10:12 pm

He's looking for a gearset that will retard cam a bit. He's at the max for crankcase pressure, got an extra hose from dipstick hole.
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Pete Roper
GRiSO Capo
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Pete Roper

Posts : 7515
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Age : 63

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PostSubject: Re: two valve 1200?   two valve 1200? Icon_minitime1Sun Oct 04, 2020 11:05 pm

Does the Sport have the breather off the side of the timing chest? I can't remember? If it does sticking something like an Ag-bike exhaust spark arrestor in it will help with oil expulsion. It's a common mod with hard used Bellagios. Some sort of windage tray would probably help too.
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steveb
Montanarolo
Montanarolo
steveb

Posts : 21
Join date : 2020-09-08

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PostSubject: Re: two valve 1200?   two valve 1200? Icon_minitime1Sun Oct 04, 2020 11:50 pm

sounds interesting chaps
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Oz1200Guzzi
Don Abbondio
Don Abbondio
Oz1200Guzzi

Posts : 4404
Join date : 2014-03-13
Age : 65

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PostSubject: Re: two valve 1200?   two valve 1200? Icon_minitime1Mon Oct 05, 2020 1:30 am

Yes it has that port on the timing chest. Still moves a lot of vapour though, so maybe could do a bit better. I found out how much in actuality one year heading to QLD with Mal. Still trying to clean the oil up...

Was a split collector box, the main spigot that connects to the crankcase vent - folded in on itself on the casting line (two piece plastic welded together). Still stinks when I pull into my garage so I might (then again I might not) do something about it one day, kinda like what Mark did on his embiggenment exercise.
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