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Pressureangle

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Pressureangle last won the day on November 12 2019

Pressureangle had the most liked content!

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  • My bikes
    '97 1100 Sport i '89 Mille GT '71 Norton Fastback Commando '74 Aermacchi 350 Sprint
  • Location
    South Florida

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  1. Mine has two faces, to me; 50mph + or -. Below 50, increasingly as the speed diminishes, it rewards weighted pegs and a light touch on the bars. The handling is typically Italian, very neutral with little inclination to either fall into or stand up out of a turn. For these conditions, such as the South'n Spine Raids, I keep 30psi front and 35psi rear. I drive the front pretty hard into the turns, but truly it does like to be on the throttle better. Even in my roadracing days, I've always been a bit timid in very low speed corners compared to others. Above 50, everybody knows they're the steadiest thing on two wheels. I like the suspension a bit looser for faster work, and I tend to stay centered on the bike- because going fast enough to require hanging off is really a fool's game on public highways. For 'casual play riding' I do shift my weight a bit for psychological comfort and out of habit. I don't think my '97 Sport is a short frame, but I'm not certain. FWIW if anyone has a weave in the wind or at high speed, check yourself to see if you are actually 'pulling' on the bars to counteract the wind. If you are, lean into it and get some weight back on the bars, see if that weave doesn't go away.
  2. I'm 99% in accord with this, *but* there is that 1%. I've attached a photo of a Camshaft for illustration. On a big block Guzzi, all four cam lobes are on the same side of the cam. A compressed valve spring returns all of the energy input on the opening ramp back into the rotation of the camshaft on the closing ramp, minus heat losses through friction; on the ramps where a valve is closing at the same time another begins to open, the opening ramp 'catches' the closing rotational forces and *probably* cancels them. On the other side of the cam, though, there are two closing ramps with no opposing opening ramps to prevent them rotating the camshaft into whatever slack there may be in the chain, or perhaps overcoming the weak stock tensioner. Worse, they close at the same time doubling the effect. I believe that's the source of the spark scatter at idle, and I won't assert but remain open to the possibility that the ~3k rpm dip may be some function of chain slack and resonant property stack in the components.
  3. Fort Stockton. Oh, the memories. The bathrooms in the Shell station are so bad I just use the dumpster out back. The receptionist at the LaQuinta was the sweetest girl you could imagine. She had two nice shiners. I keep my hand on my pistol.
  4. The gears will actually give you a bigger wet spot.
  5. The signpost is a rusty Star Picket.
  6. ...and I entirely missed the part about the ignition sensing cam position, you cannot bring the ignition timing back where it belongs in any case. Ignition retards with the cam and the chain stretch. So now I am 100% pro-gear on injected motors.
  7. I sort of wish I hadn't seen that. I know you're a huge fan of gears, and so am I. Now even moreso. How did that bit get past the screen into the pump?
  8. I built a '85 LM1000 a few years ago, using a Web 86b cam and conical beehive valve springs with about 110# seat pressure and ~280# (?) over the nose of the cam. I used a Valtec tensioner in that, and it clocks over at 1000 rpm just fine, in fact the timing shows no fluctuation and I have to say I have no inclination to change it to gears. Just yesterday I started and timed my '89 Mille GT after having replaced the stock manual tensioner with a Valtec, again although with all stock valve gear and cam the timing is extremely steady. By appearances, the good tensioner does everything you need to cure the idle glitches. That said; This Mille GT appears to have been a fairly well-loved and well-kept bike most of it's life, if not perfectly maintained. The cam chain had about 3/8" slack on the manual adjuster, and contributed to crap idle and valve noise to the point I looked for a broken piston skirt. Now it ticks at 700rpm if I want it to. Here's the rub-the distributor bolts were stiff enough to make me think it's not been moved since the factory timed it, and after installing the tensioner I moved the timing somewhere between 5º and 10º to bring it up. That's a huge amount, and assuming it was ever where it belonged means these chains stretch a lot more than I would expect. Even if you bring the ignition timing back, the cam timing remains retarded to whatever extent the chain is stretched. On an engine with a 'big' cam (any of these Guzzi 'sporting' models) the idle quality and low-speed drivability hangs precariously on that timing to the extent that 4º is a very significant change. So you see there are two primary issues to consider, spark scatter and spark/cam timing. With a tonewheel and sensor, scatter apparently becomes a much larger problem, possibly due to simple ECU confusion. D'oh. I do love a succinct answer, which this is not.
  9. I've installed one in my Sport-i of course, even though it's acknowledged that 5-speeds don't have the low gear acceleration enough to create a problem. I never saw my oil lamp flicker; but hey, it's a known issue with this engine configuration, and they're cheap insurance. What if one lives on a steep grade? Besides, all the cool kids have them.
  10. If it costs nothing, it hurts nothing. It was dealership gravy in the RV industry, and I got rather disenchanted with the unethical propaganda they used to sell it. They charged something like $25/tire 15 years ago. If it's free and convenient, I'd use it myself. There is no downside.
  11. Nitrogen has only two places in my world; 70% in the air I breathe, and 100% in tires where hot pressure is critical and blowouts contribute to fire safety. Nitrogen was a real fad for a while, but when you realize that if you let all the air out of your tires, and re-inflate with 100% nitrogen (can you verify that it's 100% nitrogen?) you still have all the regular atmospheric air in the tire left over. So you go from 70% nitrogen to 90% nitrogen. Even the guys who use it for tire pressure control use pressure caps when it's legal.
  12. *strictly* for balancing engine components. and small electrical devices. and such.
  13. Good grief, made me climb the ladder and wake up ol' 3-31 and remind myself how old I am. I have only 4 relays. Weights; Siemens original 15.1g GEI Chinese, 18.9g Omron USA, 20.1g The Omrons aren't noticeably heavier than what's in the bike, I'd been fondling my Seimens spares.
  14. So I received my Omron relays today from eBay. All I can say is that the quality of the housing is notable better than some others, and that they literally weigh twice as much as the non-Omron relays I have in the bike. Yikes...they may actually be what we hope them to be.
  15. I keep thinking that myself, but given the bashing of parts by the straight cut transmission, I like the idea of the bit of cushion provided. Getting a hose that fits and stays on is a challenge, to be sure.
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