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 Post subject: Re: Laguna Seca Clone
PostPosted: Thu Feb 26, 2015 2:38 pm 
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Joined: Wed Nov 17, 2010 5:45 am
Posts: 391
Hi Mike, What compression and size pistons are they? Also do the heads run big or little spark plugs with those size valves. Thanks Boucher.


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 Post subject: Re: Laguna Seca Clone
PostPosted: Fri Feb 27, 2015 12:45 pm 
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Joined: Thu Oct 14, 2010 11:23 am
Posts: 1802
Hello Boucher. First, this is to be a good-running street bike that closely resembles a Laguna Seca, but mainly with some upgrades to wheels (17-inch Technomagnesios) and rotors (300mm and 220mm floating). Years ago Gowanloch sold some very-complete LS fairing kits for the amazing price of $400US; I later found a near-new solo seat for a LS, and will use a NOS F1b tank. The F3 400 frame is identical to the LS frame (mainly the muffler hangers). This bike will be for going to the café, to sip a latte (a very short rhyme).

It will not be a WSBK winner, or a club racer, or even a track day bike. So, the engine plans are more humble. The valves are now 41/35mm, but with the large plug remaining. Porting (by me) is limited to opening the intake ports to +33mm, matching manifolds to that, and some relief above the valve heads (like the more-modern 750-900s have). The pistons are 88mm RAM street versions for an M750 (sold by DP once), so they have hemispherical domes, with perfect valve reliefs, that are smaller than the F1B but larger than the Pantah 650 heads. They easily fit within the chambers, which are now slightly larger because the valves are recessed some, without potential conflict. I know that a bigger piston will increase the compression ratio. I have not played with the cc measurements yet, or done any calcs, but when I get to that I can always shave a bit off the tops if too-high compression is an issue. Also, the valves are still 4.5mm apart (with the bigger valves), so the 900SS cams will not cause the valves to crash into each other. Yes, the valves are slightly shrouded, but compromises are sometimes needed to get things done. I have confidence this will be a decent engine, and a nice bike.

By the way, Carlo actually paid attention to my requests or suggestions (using a translation program to help), and even more shockingly --- just did it! He did not hide them on a shelf and make me bug him for a year and a half to do them. And he used good judgment on what really needed to be done, or not done. That is worth a lot to me now.


Last edited by 618F1 on Sat Mar 14, 2015 12:49 am, edited 1 time in total.

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 Post subject: Re: Laguna Seca Clone
PostPosted: Wed Mar 11, 2015 7:59 pm 
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Joined: Thu Oct 14, 2010 11:23 am
Posts: 1802
Session 2: First major change is to go full bore on the engine, by switching to a set of NOS F1b heads I have saved for over 10 years. They will have GiaCoMoto F1 cams, and minimal porting and manifold matching by me. Standard F1 cylinders and pistons will be used. Bottom end is a low-mileage 750 Sport, with new rod bearings, seals, and gaskets. Light flywheel and some gears, and a Montjuich lightened clutch outer basket with vented clutch cover will be added. I am going to use the heads that Carlo modified on a 650 Pantah racer at some point. MikeV

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Last edited by 618F1 on Fri Mar 13, 2015 2:20 pm, edited 1 time in total.

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 Post subject: Re: Laguna Seca Clone
PostPosted: Thu Mar 12, 2015 3:19 pm 
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Joined: Thu Oct 28, 2010 4:44 am
Posts: 1783
Images: 7
BELLISSIMO!!!!!!!!!!!!!!!!!!!!! BRAVO!!!!


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 Post subject: Re: Laguna Seca Clone
PostPosted: Fri Mar 13, 2015 12:23 pm 
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Joined: Thu Oct 14, 2010 11:23 am
Posts: 1802
Session 3: Well, here is my version of a cheap lightened/ventilated clutch-side engine cover. I have to make up for my lack of fancy/schmancy equipment with cheap tools from the hardware store. Total "machining" time, one hour and fifteen minutes; total cost, maybe $5.99; value, priceless.

Right now I am experimenting with dipping the vented clutch cover in old brake fluid to remove the thin paint that will peel off the moment the first drop of fluid seeps out of the line or bleed nipple. Photos to follow.

Thanks for looking Carlo; maybe it will be as fast as your Montjuich! MikeV

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And here is the clutch cover with paint removed using brake fluid. A bit more cleaning, and beading, and it will be ready to go. Maybe I can get 5 gallons of this stuff together and drop a painted engine case into it!

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Last edited by 618F1 on Fri Mar 13, 2015 1:10 pm, edited 2 times in total.

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 Post subject: Re: Laguna Seca Clone
PostPosted: Fri Mar 13, 2015 12:43 pm 
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Joined: Fri Oct 15, 2010 12:20 pm
Posts: 1275
Location: Vermont, USA
I'm with you Mike, those hole saws work great in aluminum. Just don't let them get to hot, they'll temporarily seize up.
Bill


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 Post subject: Re: Laguna Seca Clone
PostPosted: Fri Mar 13, 2015 1:31 pm 
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Joined: Tue Feb 21, 2012 4:38 pm
Posts: 135
There,s nowt wrong with that,tis a right good job, well done.


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 Post subject: Re: Laguna Seca Clone
PostPosted: Thu Mar 19, 2015 10:58 am 
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Joined: Thu Oct 28, 2010 4:44 am
Posts: 1783
Images: 7
e VAI!!!!


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 Post subject: Re: Laguna Seca Clone
PostPosted: Sun Feb 07, 2016 2:39 pm 
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Joined: Thu Oct 14, 2010 11:23 am
Posts: 1802
Well, let's try again this year. WILL turn this pile of parts (F3 400 frame, combo 750Sport/F1 engine, and nice 17-inch Tecnos with floating rotors) into an upgraded Laguna Seca clone. MikeV

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 Post subject: Re: Laguna Seca Clone
PostPosted: Sun Feb 07, 2016 2:45 pm 
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Joined: Thu Oct 14, 2010 11:23 am
Posts: 1802
And, more.

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