RE: Gas engine equivalent to OS 160 2 stroke?
Racer, I think to get the comparable power, you need a light weight 35 to 40cc gaser. My rule of thumb is that the gaser should have about 50% more displacement then the glow engine. The Brison is on the heavy side with its Sach cylinder etc. Besides a cub has a short nose and liftinf air foil. Weight shouldn't be an issue, since it will be hanging on the prop most of the time. Dave
Posted on: 6/12/2008 3:10 AM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=7610009

RE: What engine is this?
smooreace, Set the needles at about 1.5 to 1.75 turns open. First close them gently against the seats then open them, counting the turns. As long as the carb diaphram is in good shape and the fuel circuit isn't coughed, it should pump fuel. Dave
Posted on: 6/12/2008 2:59 AM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=7609997

RE: ryobi 4 stroke weight
Foamcut, I haven't fooled with the engines for a while. Teh very long reach special spark would make it very difficult to make a 10mm adapter. I thing EI would be the best ignition solution for weight savings. It would fire the plug every time. You will get ignition everyother revolution. Dave
Posted on: 12/25/2007 11:52 PM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6804940

RE: WHAT IS IT ????
Hi, It is a Kawasaki reed valve engine. It is a about 51cc. I am attaching a picture of a stock engine by CB. Dave
Posted on: 12/10/2007 12:57 AM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6737303

RE: What size conversion engine for a Dynaflite SE5a?
Jim, The clutch drum is held on by a screw going into the end of the crank stud. Stick a allen wrench in the end of the drum where the flex shaft is normally inserted. Remove the allen screw and the drum wll slip off. Then clamp the flywheel in a vise and turn off the clutch shoe assembly. I beleive that it is left hand thread. You can reduce the engine weight and size by converting it ti gas/glow ignition. This is discussed else where in the conversion forum. Good luck. Dave
Posted on: 9/25/2007 11:38 AM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6411839

RE: What size conversion engine for a Dynaflite SE5a?
Jim, Your plane would work well with a 25 to 32cc trimmer conversion, swinging a 16 to 18 inch prop. A Ryobi 31 would fit completly inside the cowl and use a 18" prop. A Homelite 25cc would be a good choice also, but the carb would stick out of the side of the cowl. This might make adjustment easier. The The four pound weight of a flywheel equiped engine would help balance the plane, since the nose is short. The Clark Y, flat bottomed airfoil will carry the extra weight fine. Dave
Posted on: 9/23/2007 11:25 AM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6403376

RE: How to assemble STIHL 4-mix engine?
Richie, Here is a link with valve adjusting instructions. My usual starting point on my four strokes is to have the cam lobe pointing down with the piston at TDC. This thing has over lapping valve for more power. Dave http://www.cdcstihl.net/techtips/tips_v1n2_sm07.pdf
Posted on: 9/10/2007 4:59 PM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6350910

RE: Sachs displacement
foamcut, On my Mahle Sachs cylinders, the first digits indicate the bore in millimeters. 44=3.2,55=5.8,48=4.2,49=4.1,45=3.1. I hope this helps. Dave
Posted on: 9/4/2007 11:01 PM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6329000

RE: Brison 5.8 best performance
8A36, Be sure that you baffle the cowl, so that all of the air is forced to go throuh the fins. Make sure that the cowl exit area is 1.5 times the inlet at the fins and the open cowl flaps should help draw out the air also. This should solve the overheating issues. Also as mentioned above, use a 24x12 or 26x10 prop and it should get close to 6,500 rpm. The flywheel action of the larger balanced prop sould help reduce vibration. Timing and mounting need to be good as well. Good luck. Dave PS: The typical carb has a spring on the throttle shaft which prevents vibration from allowing thr throttle to cruve the throttle bore. Check for this.
Posted on: 9/2/2007 1:57 PM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6318319

RE: Q50 Prop Info to contimplate and comment on
Splais, A 20x8 seems like a little small for a 50cc. The needle settlings sound like a good starting point. The thrust is low and should be closer to twenty pounds. Dave
Posted on: 8/30/2007 12:12 AM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6305395

RE: Poulan S25CVA 38cc
Spiffy, It is a needle bearing, reed valve engine, made between 1974 and 1984. It should run ok. It may need a thrust bearing added to the crank. I would start with an 18x8 prop. Here are the spec's. http://www.acresinternet.com/cscc.nsf/ed1d619968136da688256af40002b8f7/81fd7e2d6f5cdc7988256bfa00189277?OpenDocument Dave
Posted on: 8/27/2007 2:46 PM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6293746

RE: Muffler restricting my Evolution 26???
Phall, The 15x10 seems a little small to me. I would use a 16x8 at least. You can cut the exhaust tips off of the muffler to reduce back pressure. This will result is an increase in power with little or no change in noise level. Dave
Posted on: 8/20/2007 11:37 AM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6262359

RE: Baffling this engine Need HELP
driesbabe, Don't forget to install a lip accross the leading edge of the cowl air exhust. This will help extract exhusting air from the cowl. Dave
Posted on: 8/14/2007 2:57 PM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6237633

RE: Evolution 58GX good or bad
Closetguy, Buy it. It is state of the art, same as MVVS 58. If you don't like it, you can easily sell it for more thewn you paid for it. This is a no brainer at $400. Dave
Posted on: 8/14/2007 2:07 PM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6237485

RE: 90* 77cc gasser
Paul, If you side mount the engine it will be OK. You should add somr lead the tip oppisite the cylinder. It won't take much to balance the plane. Just a small sinker or solder epoxied inside the tip. It will only take a small fraction of the weight of the cylinder. The idea of a elbow manifold will work, but many have found this to be difficult to get right. Post some pictures,if you can. What brand saw did it come out of? Dave
Posted on: 8/7/2007 6:19 PM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6208909

RE: 14MZ warning!
DC, Here is a thread that addresses many flyers experiences with the receiver. http://www.rcuniverse.com/forum/m_3860339/anchors_3860339/mpage_1/key_r5014/anchor/tm.htm#3860339 Dave
Posted on: 8/2/2007 11:51 AM by Author "davewallace" in the forum "RC Radios, Transmitters, Receivers, Servos, gyros"
http://www.rcuniverse.com/forum/fb.asp?m=6187578

RE: Shindiwa question
Captain, It's good to hear that the operation went well. The pace maker should make a big difference. Take care. Dave
Posted on: 7/26/2007 12:39 PM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6159085

RE: Solo 4 Blade prop on a Brison 4.2?
Mustang, That sounds like way too much prop for a 69cc engine to me. You would have to deduce the pitch to 24x8 to get decent RPM. The Jug had a three bladed prop in the early years with less area. They went to the wide four bladed prop later to get improved climb with the heavy airframe. I think that a three blade 24x8 would be good. Good luck. Dave
Posted on: 7/24/2007 12:23 PM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6150140

RE: Shindiwa question
Antique, This website looks like the correct item with 24.5cc displacement. Dave http://www.shindaiwa.com/nam/en/products/arthedgetrims/ah2510_ahs2510.php
Posted on: 7/24/2007 12:13 PM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6150107

RE: WILL AN ELECTRIC STARTER START A GAS ENGINE?
John, Pacific Aero has geared starters at reasonable cost. The claim to handle up to 35cc glow. I have one and use it with a jump start for extra torque. Here is the link. Dave http://www.ecsvr.com/wrc/ShopExd.asp?id=524
Posted on: 7/13/2007 12:55 PM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6106451

RE: gas fuel with glo plug no ignition
Commander, The WT-499 is just a Walbro pumper with larger passages for glow fuel and has an 11mm venturi. You can use a standard Walbro 11mm carb for gas glow. The 499 may run a little rich if you can't close the needles enough. The 499 would be nice to have around for experimenting. Dave
Posted on: 7/13/2007 12:27 PM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6106320

RE: Need Help - Brison 3.2 Smoke Tap
Rich, It doesn't sound like you are very comfortable disasembling engines. If you do it yourself, you will have to do some disassembly. The fitting is usually installed in either the side or rear of the case. The cylinder must be pulled to do this, because you must place some material inside the case to catch the filings from drilling and tapping the hole. Ralph at RC Ignitions may be able to help. Give Ralph a call. Dave PS Give the engine another good look. Some Brisons come tapped for smoke from the factory. The hole would have a screw in it, maybe on the side under the exhust port.
Posted on: 7/8/2007 10:51 PM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6086331

RE: E 3 plugs for ryobi 31cc
bye, It must be a resister plug regardless. Dave
Posted on: 7/8/2007 10:18 PM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6086230

RE: Flexible exhaust?
Hi, B&B Specialities hs flexable exhust pipe available. Here. http://www.bennettbuilt.com/page5.htm Dave
Posted on: 7/5/2007 8:50 PM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6075360

RE: How to convert Glow engine to Ignition gas engine
Borna, This question should be on the engine conversion forum. It is doable, but you will need to use the same amount of oil that is used with a glow engine operation. This is because of the bronze rod bearings. Gas engines usually have needle bearing con rods. This allows lower oil content in the fuel. A weedeater size carb will be needed. These have about a 7mm venturi. the walbro versions have 20 cast into the carb inlet. For ignition you can use a electronic unit from any nuber of sources or run it on gas/glow fuel mix with a 4 stroke glow plug. 1/4x32 spark plugs cost about $16. All of this is found in the engine conversion forum with a simple search. Good luck. Dave http://www.rcuniverse.com/forum/forumid_92/tt.htm
Posted on: 7/4/2007 9:24 PM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6071766

RE: Who make a cannister ready Ultimate
Eagle, Here is a long thread on the BME Ultimate. One of the replies states that cans will fit, with some minor trimming. http://www.rcuniverse.com/forum/m_3506670/mpage_2/key_ulimate%2Ccanisters/tm.htm Dave
Posted on: 7/2/2007 3:21 PM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6061808

RE: i just bought 4 Mac MB-290 on ebay where can i get conversions
Tiny, If you bought the parts and did the assemble yourself, it will be much cheaper. If you have someone else do it, they will charge you for parts and time. Ken Lamert and Brillelli have done these in the past. Wacker engines also has all of the parts and kits for some. They are on the net also. Dave
Posted on: 7/2/2007 12:41 PM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6061717

RE: Alternative fuels for glow engines
y84, You can run glow engines on a mix of gas, methanol and oil. You will need to use the same oil content and install a Walbro type gas carb for best performance. Use a hot 4C plug for reliable idle. Spark ignition can be add also if desired. CH Ignitions has kits and parts fot the large Super Tiger engines. This is best done on the large engines where ful savings are greater and required oil content is lower. Here is the gas/glow link. http://www.rcuniverse.com/forum/m_1267448/tm.htm Dave
Posted on: 6/29/2007 12:33 PM by Author "davewallace" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6050861

RE: 100 cc plus engines?
Hi Charlie, I did some measuring of the Hawk and found that the distance is 7.5 inches from the back of the prop to the firewall on a quarter scale model or 30 inches on full scale. This is enough room for any of the big twins. You just have to use the correct lenght standoffs to position the prop properly. The only except is the big ZDZ rotary valve twins, which would require a large well or hole in the fire wall for the carb. Engine weight would be helpful, due to the short nose ahead of the CG. It should balance between the main axel and the back of the tire. Here is the ZDZ demension chart link. http://www.rcshowcase.com/html/dimensions.html The cowl diameter is around 17 inches which even will fit a ZDZ 210 at 15.5 inches wide and 7.6 inches long. Dave
Posted on: 6/29/2007 12:20 PM by Author "davewallace" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=6050796

RE: 6400 rpms on a homie
k18fr, The "28" Walbro has an 11mm venturi and usually has a 5/8ths inch throttle bore, which is larger then the stock 1/2' hole in the insulator. The next step after the 11mm carb would be to bore out the insulator to 5/8ths inch and add an external pulse hose to drive the carb pump. Dave
Posted on: 6/28/2007 11:01 AM by Author "davewallace" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6045747