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Just out of left fieldFrom on here, not my personal experience, Larios did have a cam wear problem (like current 8V but blamed on valve spring pressure)Just maybe the .021" difference is worn lobe on Lario, aero cam is exactly the same but unworn ?Would explain the duration figures being the same.In which case, if as stated here, Lario & V65 were the same, fitting orig V65 cam will not be changing anything.Lift in book for Lario and V65 cam anyone ?That's apparently not for the great unwashed masses to know. I haven't found diddley squat about the cams. Shirley ;D though, if the Lario cam was worn that much there'd be signs of it? I'll ping Milich one more time. He's probably getting tired of me bugging him.
You dont measure cam timing at the pushrod you measure it at the valve. Trying to measure cam specs at the pushrod doesnt take into account the rocker ratio and the change of contact point of the rocker foot on the valve tip as the rocker rotates through it travel. So even if the rocker ratio is 1:1 you still wont have exact cam timing figures.If the rocker ratio is not 1:1 then the lift figures will be wrong as well.If you measure at the valve you can then compare cam timing from spec sheets.Ciao
Aw.. you're still upset because I put those Gaudy Gaiters on the Lario. ~; ;D Crane cams info says to it just like I did it. http://www.cranecams.com/bulletins_listview.php?s_id=5 I won't argue total lift at the valve, though.. you're absolutely right. When I get around to it, I'm going to pull a head and check clearances, figure compression ratio, etc. to add to the collective knowledge of this engine.
Crane make cams, they dont build engines. What engine builders are interested in is what happens at the valve after all the clearances are taken up and the pushrods flex etc etc.The same reason serious engine builders dont use light dummy valve springs when doing valve timing and working out rocker post heights etc.Ciao
Certainly, but degreeing a cam is degreeing a cam. We were looking at the differences between the aero cam and a Lario cam.
.The same reason serious engine builders dont use light dummy valve springs when doing valve timing and working out rocker post heights etc.Ciao
Your right about the rocker ratio, but I believe it will only have an impact on the lift, no impact on duration. Where you can run into trouble is if your going by a manual that is giving you numbers to use measured at a specific point,(e.g.) valve tip, and you decide to measure at pushrod instead. If you measure the duration of cam off a pushrod or lifter as Chuck has, you can time the cam around the lobe center the cam manufacturer has chosen(which is in the numbers you've been given from cam manufacturer). If you don't have the cam specs.,you can still time the cam using lobe center method as Chuck has. JMO.
Whenever you convert the cam information from a linier to a rotary motion you will get a variation it may be small but it will be there. same as the cam timing will be slightly different at the valve if you convert a hard foot tipped rocker to a roller tipped rocker with no other changes.Ciao
Ok, white Veglia tach and glitter on the gaiters, that about wraps it up, lets roll.... ~;
To the best of my knowledge (admittedly almost nonexistent) ;D the numbers on a cam card from the manufacturer are done this way. <shrug>
For valve to valve I just use a pair of wooden blocks to support the head. Use carb springs to hold the valves. Assemble the rocker gear etc and then turn the cam. Peer up into combustion chamber and see/measure V-T-V.Pete
Chuckre orig cam in Lario, measure all 4 lobes peak lift, if one you measured was worn .021" very unlikely all 4 are equally wornBut I'm sure lift on that cam is known by someone on here, especially if as claimed before it is std V65
I use carb springs tooWooden blocks in lieu of barrels ?I get that but dial gauge on valve still needed to measure clearance as far as I can see, very hard to measure v-v with anything else.Seeing a mile obviously good enough, seeing .030, .040 or .050, beyond these old eyes, OHC engines totally different just hold head upside down with cam installed
Strangely, enough.. Ed Milich says:stock v65 cam is .225" cam lift, .285" valve lift. 1.27 rocker ratioSo now we have V65.. Lario.. and Aero, each with different lift. <scratching head>
As I said Chuck, if you measure at the valve you can't go wrong. Rocker ratio is part of the equation as are the other variables.Ciao
You're preaching to the choir here. ;D I'll have the head off and have a look no matter what. No need to take a chance on wrecking some unobtainium stuff.. and.. we need :PICS!:
:+1It's all enthralling... Let me know when you plan on starting it up, and I'll try to come down for a first start video.It's bound to be Guzzi YouTube gold. ;D-Joe
I am also. I have a dumb question...I think I noted about six or eight pages ago that this device has some provenance with the folks at Sierra Nevada Corporation.I know they have A LOT of different divisions, and being governmentally inclined they tend to be close mouthed.And I know that having empirical data provided to you would take at least half the fun out of this project.But those folks are one of my customers, and I can't help but wonder - have you considered seeing if you can find a friendly soul somewhere inside the project to share whatever documentation they could legally share with you regarding this engine?(prepares for NSA to visit me and ask me about my loyalty to the state) ;)