wyk
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Everything posted by wyk
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Jis some random aftermarket that will prolly grenade eventually. But, it's not like it's goin in to a nice new saw. It's a .069 or so, good for about 210 PSI with the base gasket installed, so I am told. We'll see how it measures once it's installed. Thanks for the info on the tester!
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Well, looks like I'll be adding more exhaust timing and more transfer work - the piston is on it's way:
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Excellent. I may be getting a pop-up added to this piston of mine. Which reminds me, I don't have a compression tester in Ireland. Anyone got a good idea for a source for one?
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Did ya install it without the gasket? MCW tells me these things will usually pull close to 180 without the bottom gasket.
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Found a video of the noise the thing makes: [ame=http://www.youtube.com/watch?v=klPIIyEkAGE]Stumping a 32" Sycamore with a ported 385XP. - YouTube[/ame]
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Don't forget to richen up the carb to compensate for the breathing.
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But I bet it puts wood on the ground in a hurry.
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Even on a 460, the dual port is freakin loud without the spark arrestor. Sometimes adding a spark arrestor to a large hole will work if you get a bit too eager with the port - assuming it's possible to do so. I can't use my 385XP for built-up areas. It is insanely loud. When I was in England, it literally echoed up and down the hillsides.
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The only 'science' I've seen has been borrowed from bike tuners. Even then, there's not a lot of consensus. I have seen 75-80% of the exhaust port size as a guide on non-ported saws. However, I have seen good results in high compression saws with a 100% or more opening. In my personal experience, in a non-ported saw, I have seen great results with just doubling the size of the stock muffler exhaust. On some Echo's, I have done even more than that with excellent results. It really depends on the CC's of the engine, the muffler size, the porting, the carb, etc etc. Which saw is this for?
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I hear ya. Nice work, Spud! Guess I get to post my muffler, too. It ain't pretty, tho This is how it came on my 385XP. I only added the two front ports in the bracket: Side view:
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On these ported 372 BB's, there is almost no limit to how far you can open up that muffler.
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I've never seen them make a whit of difference myself. I can see an argument where the skirts have been entirely removed to allow access from the windows, or on most cylinders where the bottom transfers are on the side VS the bottom like on the 346 and 372. But, if you ask me, on a 372 or 346, it only serves to lighten the piston. This is good for high rakers, short bars, or race chains, but for a work saw, I think you lose some torque in the trade unless you increase the compression significantly.
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Found it, google: Building a 372XP Big Bore With 272XP Piston
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Lowering the exhaust doesn't hurt if the ring clears. It allows faster blow out, and is the reason many porters put a shelf in the exhaust itself. I think Randy has ported one of these, too. Prolly has a thread on it.
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He did mention he was considering using a Stihl 52mm piston. I dunno what one looks like exactly off-hand. The piston I have here, the same one that comes with the kit he is porting, has the ring-end right above the intake if you only use the top ring. The other end is , of course, askew of that. Al runs only the top ring in the same kit and has hundreds of hours on one without any problems. Also, I doubt this piston will cover the intake he has there. I didn't open my nearly so much, and I have mebbe 1mm on each side(same with my exhaust).
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On this set up, he can run a single ring on the top. It also has the benefit of the pin being centered directly above the intake port. I will likely run mine with a single ring and no bottom gasket.
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Wait - that intake is REALLY wide. It doesn't free port at that width?
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Nice. Yeah - it's the same jug I've got.
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The HyWays are sposed to be a bit more aggressive than stock timing, anyways. The vid is Al How in Australia. Ya know him as Aussie1. I think I have a HyWay here as well. Lemme get some of the stock photos of it I took before porting..sec Look familiar? I have it mildly ported now, but was considering just going freakin nuts with it since I rarely use my own saw in work and am about to get either an Echo 500P or Husky 550(and just do a simple MM to it and use it for work).
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That's a bud's porting in Australia. I've only ported one saw so much, and it was a lil saw. I like to be a bit more subtle with my work saws. Anywho - here's what that exact jug can do when you put it in a 365 chassis: [ame=http://www.youtube.com/watch?v=AB5kx0TWzxE]372XP big bore ported 32" bar hardwood - YouTube[/ame] That looks like 'stringy bark' - a type of eucalyptus? I put a mildly ported BB it on top of a 365 once without raising the transfers and I got enough torque to pull a 28" bar buried in hardwoods easily. I am gonna run an 8 pin and a 20-24" bar with my most recent attempt... if I ever get that 365 chassis form England. Prolly a month or two away. Mebbe we can do a get together?
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Go bananas:
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Got any pics of the chain you used?
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Sawfun9 on AS has an 088 that will bite the arm off you if the decomp comes off early. It's got the 3/8 9pin mod and is a freakin "laser"!
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Most folks don't know it, but that happened the moment after Spud and Cut4Fun took their avatar pics?
