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Post by Deleted on Jan 2, 2018 19:08:27 GMT -5
I recently saw a C91 on eBay and it showed the carb with a deflector shield on the front of the carb. My 2000 doesn't have one, nor does the 2100 or 3100, but the 1050, C5, C52, C7. C71, C72, C9. and C91 does and the C9 and C51 has a split back carb deflector. Anyone have an idea what purpose the deflector shield serves and why it isnt needed on all saws? Thanks
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Post by undee70ss on Jan 2, 2018 19:18:34 GMT -5
The SXL925's also have them. I really don't know why some saws have them, some don't. Im guessing it has something to do with the intake port design and or timing.
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Post by dieseltech on Jan 2, 2018 19:37:51 GMT -5
My C7 has one. My C9, C5 & C51 don't . I wonder if some people take it off for better performance?
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Post by onlyhomelites on Jan 2, 2018 20:08:59 GMT -5
Perhaps as the Tillotson HL series improved, it wasn't necessary anymore? On the XL-900 series it does catch some fuel. I think undee70ss is on to something with the timing... The 900's are high compression and perhaps the reeds don't seat soon enough to prevent some spitback.
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Post by lesorubcheek on Jan 2, 2018 21:26:39 GMT -5
My C7 has one. My C9, C5 & C51 don't . I wonder if some people take it off for better performance? Same here. I've came across some Cs with 'em and some where they've been removed. The metal screw-on deal was shown in all the C series IPLs. Never tried running a saw with it in place and then with it removed to see if it makes any difference. My guess is it wouldn't make a noticeable difference, but it'd be worth trying, ya never know. I don't like 'em because it makes it hard to pour a little fuel in for a prime for saws that have sat for awhile. Just another guess, but they maybe there to keep stuff from accidentally getting sucked in to the carb if it's running while the air filter is removed. Dan |
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Post by Deleted on Jan 2, 2018 22:19:53 GMT -5
Whether the saws came with a shield or not the carbs all seem to show mounting holes for them. I would be very hesitant to run a saw without one if the IPL shows it is equipped with one
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Post by lesorubcheek on Jan 3, 2018 13:19:48 GMT -5
I wouldn't be skeered (yes I'm from Alabama  ) and here's why. First, I've ran more than one C without it since when I got the saw, it had been removed by the previous owner. Never noticed any problem running one. Another reason is if you compare the XP1020 and the Super XP1020. Both used the A-63585 carb, but they decided to remove the deflector for the Super. You may say the super had a different cylinder and piston, but the real difference in the cylinder was larger studs and on the piston was I think just the ring locating pin changed to offset the end gap. It was likely as dieseltech mentioned earlier an attempt to eek out a hint of more power for the Super. Either that or they realized it really wasn't doing any good being on there. Dan |
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Post by stillsawing on Jan 3, 2018 18:44:57 GMT -5
Wonder if the carb manufacturers specified the installation. I've seen them in use with the "yellow saws".
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Post by Deleted on Jan 3, 2018 19:08:14 GMT -5
My question was, and I think I've gotten some great replies, is why deflectors or no deflectors or different deflectors. I wasn't questioning whether I or anyone else could or should run a saw without a deflector because that doesn't concern me.
It's not a matter of being afraid or worried, but generally I don't operate machinery without it having a every part that the equipment came with.
I repair lawn mowers from time to time and I get lawn mowers without hoods. You can run a lawn mower without a hood and that is a person's choice, but a hood and/or earlier engine side coverings/engine tin are what draws air and cools the engine; without them it is possible to destroy the engine on a hot day. I get mowers in without battery hold down brackets because either the person wasn't concerned about reattaching the battery hold down bracket or they purchased the wrong battery and the hold down brackets no longer fit. In the course of mowing a battery without a hold down bracket will put strain on the battery terminals and will compromise the connection after time. I get mowers in without air filters covers because people either lost the bolts that held them on or didn't want to take the time to replace the bolts. In the end they really didn't care if dust and dirt was sucked into the engine. It takes very little dirt entering a carburetor to destroy a small engine, but this happens all the time. I have given a few examples as it pertains to riding lawn mowers, but I also see very similar discrepancies concerning motor vehicles as well; all of which shortens the life of the equipment.
Most of the saws and old garden tractors I've bought came from original or second owners and were meticulously maintained and therefore most did not have excessive wear and tear and very little was needed to continue performing the job it was built to do. I have never put a transmission, piston, or rings in any of the over 50 old garden tractors I've owned or any internal on any saw I've owned and I attribute that to careful consideration and respect of the machinery by owners.
All these companies employed research and engineering specialists that spent a considerable about of time designing this equipment for quality service and the concern for quality was job one for Homelite and many other manufactures of the day. I just feel it would be arrogant and remiss of me if I did not follow the standards set by the best minds and manufacturers of the day. At the end of the day it is everyone's personal choice in anything they do, however nothing beats being well informed as how to take care of equipment, it's why I like coming here.
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Post by onlyhomelites on Jan 3, 2018 19:32:02 GMT -5
All I can say is every time I see the topic "Deflector Shield" at the top of the list, I want to make a Captain Kirk joke.
There, it's out of my system!
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Post by Deleted on Jan 3, 2018 21:12:07 GMT -5
All I can say is every time I see the topic "Deflector Shield" at the top of the list, I want to make a Captain Kirk joke. There, it's out of my system! You forgot the "Captain's Log". |
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Post by onlyhomelites on Jan 3, 2018 23:25:24 GMT -5
There's just too many jokes that can be made with that one! Good call though!
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Post by tangobravo on Nov 23, 2020 12:03:09 GMT -5
Hello- New to the board here and love the information!!
I ran across this post while looking for information on the Homelite "Air Deflector" that was on my SXL 925 saw. It seems there is a lot of conjecture on the topic! I had been wondering for some time and read about various ideas that were put forth. I began thinking maybe it was for high rpm leanout control (SXL925's famous for lean running damage issues). The governor screwed into the carburetor however works by going rich, so likely that is not the purpose of the deflector. Another idea I had was- The carburetor idle speed must be adjusted without the air filter in place. It is possible the reason for the Air deflector is to keep crap from entering the carburetor while adjusting the idle speed screw. Seems reasonable, but I think this is not the purpose.
The real purpose for the "Air Deflector" is likely not that, but rather a "Blast Shield" to protect the user from a potential backfire while adjusting the idle speed screw- something that is not necessary with externally adjustable idle screws like in the XL 101-104 and other saws. Manufacturers don't like calling items like this, and making them sound dangerous. I believe that the purpose is for backfire protection while the air filter is off the saw and adjustment is being made.
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Post by tangobravo on Nov 27, 2020 20:51:42 GMT -5
Do these Tillotson carburetors (with fuel governors) start backsplashing raw fuel when the rev limit is hit??
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