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steveb
Tanabuso
Posts : 85
Join date : 2020-09-08
Age : 62
|  Subject: two valve 1200?  Fri Sep 18, 2020 11:32 pm | |
| Did guzzi ever make a 2 vale per cylinder 1200 GRiSO? | |
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Oz1200Guzzi
Don Abbondio
Posts : 6019
Join date : 2014-03-13
Age : 68
| | Subject: Re: two valve 1200? Fri 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
Posts : 1328
Join date : 2015-08-09
Age : 58
| | Subject: Re: two valve 1200? Sun Oct 04, 2020 2:49 pm | |
| "just" Tony.....  BB is part of the evolution of things, no? | |
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Oz1200Guzzi
Don Abbondio
Posts : 6019
Join date : 2014-03-13
Age : 68
| | Subject: Re: two valve 1200? Sun 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
Posts : 581
Join date : 2016-04-14
| | Subject: Re: two valve 1200? Sun 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
Posts : 9472
Join date : 2013-05-29
Age : 65
| | Subject: Re: two valve 1200? Sun 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
Posts : 581
Join date : 2016-04-14
| | Subject: Re: two valve 1200? Sun 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
GRiSO Capo
Posts : 9472
Join date : 2013-05-29
Age : 65
| | Subject: Re: two valve 1200? Sun 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
Posts : 581
Join date : 2016-04-14
| | Subject: Re: two valve 1200? Sun 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
Posts : 9472
Join date : 2013-05-29
Age : 65
| | Subject: Re: two valve 1200? Sun 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
Tanabuso
Posts : 85
Join date : 2020-09-08
Age : 62
| | Subject: Re: two valve 1200? Sun Oct 04, 2020 11:50 pm | |
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Oz1200Guzzi
Don Abbondio
Posts : 6019
Join date : 2014-03-13
Age : 68
| | Subject: Re: two valve 1200? Mon 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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| | two valve 1200? | |
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