RE: mvvs 1.60 gasser carb #'s  
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    • All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Gas Engines >> RE: mvvs 1.60 gasser carb #'s
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    RE: mvvs 1.60 gasser carb #'s - 11/26/2006 7:51:00 PM   
    pe reivers



    Posts: 2622
    Joined: 1/23/2002
    From: Arcen, , NETHERLANDS
    Status: offline     		@ Charley:
    You have the Mk1 silverhead engine. If you have the tools, you can adapt the WA80 carb and manifold (the pieces between carb and engine). Over the years, MVVS only changed carb, manifold and ignition+prop washer. You can order the current parts (WT481D carb, gaskets, manifold). The fit in the crankcase has not changed over the years.

    @ Dan:
    You have the red-head with the latest WT481D carb. There is nothing to be gained by changing anything.

    _____________________________

    Pe, Dealer for MVVS, MTW and Mejzlik; www.mvvs.nl
    There is sanctuary in analisys.

    (in reply to Charley)
           Post #: 1301

    RE: mvvs 1.60 gasser carb #'s - 11/26/2006 10:32:19 PM   
    dmccoach


     

    Posts: 41
    Joined: 5/27/2002
    From: Kutztown, PA, USA
    Status: offline
    quote:

    ORIGINAL: dick Hanson

    Dan --- I have been running two of the Evolution 26 engines -one with pipes one with in cowl.
    My thoughts with these engines are :
    leave stock carb alone more bore will not increase power .
    Use stock header length size
    use stock pipe
    For pipes --use a prop which allows easy 8500-9000rpm on the ground - CF pipe is much more easy on the ears . Powe r is about the same .
    for in cowl Evolution muffler prop for 8000 minimum-on th ground
    use a tiny 4 cell very high output ( low impedance) battery - 900 ma is plenty.
    Increasing power by increasing carb size is futile exercise
    the stocker has good response throughout range and unles you switch to alky and a dash of nitro - the increased bore is of no value- THAT setup will really increase power but unles you have a new found desire to setup carbs - forget it.
    These little 26 engines are terrific - run em with 30-1 Mobil- let em rev - and they run forever .



    Thank you Dick - I will take your advice and not modify the carb. I already run the ES carbon pipe and a MACS header cut to 12CM length (lighter than the steel stock header)... I run 2S 1200 LIPO and a 6volt regulator. I also have been running Amzoil at about 30:1

    I have both the Skorepa 18x6 and I have been recently running a zinger 18x8 - motor is fully broken in at maybe 2 gals through it - I cant get above 7300 with the Zinger 18x8 - I have not tacked the Skorepa 18x6, but based on power feel, I don't believe I have that much more... I really don't know how you are getting near 9k with this motor.

    I am a little disappointed in this regard, but think it is otherwise a nice motor - great start, transition, idle, etc.

    Thank you, Dan

    < Message edited by dmccoach -- 11/27/2006 1:04:09 AM >

    (in reply to dick Hanson)
           Post #: 1302

    RE: mvvs 1.60 gasser carb #'s - 11/26/2006 11:13:52 PM   
    dick Hanson



    Posts: 9923
    Joined: 12/12/2001
    From: slc, UT, USA
    Status: offline     		The Zinger 18x8 -that I have tried -- loads engine too much and it never gets on the pipe - Put the 18 x6 on it
    Unless the engine is allowed to turn over 8000 the pipe simply does not work.
    15 cm is shortest good performance length of header that we have run - shorter will require faster running band. I have run aluminum and the steel header no difference in performance if both same length the al header as a wee bit larger internally but that made no difference.

    < Message edited by dick Hanson -- 11/26/2006 11:21:14 PM >

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    (in reply to dmccoach)
           Post #: 1303

    RE: mvvs 1.60 gasser carb #'s - 11/26/2006 11:42:29 PM   
    dmccoach


     

    Posts: 41
    Joined: 5/27/2002
    From: Kutztown, PA, USA
    Status: offline
    quote:

    ORIGINAL: dick Hanson

    The Zinger 18x8 -that I have tried -- loads engine too much and it never gets on the pipe - Put the 18 x6 on it
    Unless the engine is allowed to turn over 8000 the pipe simply does not work.
    15 cm is shortest good performance length of header that we have run - shorter will require faster running band. I have run aluminum and the steel header no difference in performance if both same length the al header as a wee bit larger internally but that made no difference.


    Thanks again Dick - I will try the Skorepa 18x6, tach it and report back here - However, I cut the Macs header to 12CM because that is how long the steel one is: http://mvvs.nl/ (see petrol engines and then the pipe link for the 26).

    Are you suggesting up to 15CM will provide better results? I know, you will tell me - start with a given length, tach, cut 1/8ths, tach again, cut again, etc. till you are happy with performance, but, the steal pipe (which I have) is manufactured at 12CM, so theoretically, I would have started this process from 12CM?

    Thank you, Dan


    < Message edited by dmccoach -- 11/27/2006 1:07:03 AM >

    (in reply to dick Hanson)
           Post #: 1304

    RE: mvvs 1.60 gasser carb #'s - 11/27/2006 2:14:05 AM   
    dick Hanson



    Posts: 9923
    Joined: 12/12/2001
    From: slc, UT, USA
    Status: offline     		Here is my stock header it is over 15 cm thru c/l- also the pipes I use are shown as is.
    The pipes operate by the sound waves bouncing back and forth - this is NOT the slug of exhaust -it is the sound wave- these are a positive pulse outbound that quickly echoes -if you will- becoming a negative wave - the key to making it all work is getting the cyclic waves - to have a matching set of pull and push -which correspond to opening and closing of the exhaust - this is all strengthened or weakened by the pressure in the system . (shape of expansion chamber and restriction of final outlet.)
    This is all figured out for you on this system IF- you will set engine LOAD to allow run up over 8000 rpm.
    On my setups -installing a 18x8 Mejzlic -instantly kills nice operation -
    It is too slow on rpm. I switch to Skorpea 18x6 for example - and I am right in high side of correct rpm for correct wave speed.
    Fiddling with 1/8" cutting is futile and frankly not worthwhile. forget these type suggestions ---
    Start with recommended setup - (run in 8000rpm range regardless of prop required to get there - then once you see how response works -you can try more prop load but based on my own experience - the setup as shown is ideal. I run to 10000 all the time if I let it fully unload in the air . the pipe still works flawlessly a long as I start at about 8500-this gives perfect table manners - smooth even throttle responses.



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    < Message edited by dick Hanson -- 11/27/2006 2:15:18 AM >

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    Libby

    (in reply to dmccoach)
           Post #: 1305

    RE: mvvs 1.60 gasser carb #'s - 11/27/2006 8:12:59 AM   
    Rendegade



    Posts: 842
    Joined: 3/19/2003
    From: Perth, AUSTRALIA
    Status: offline     		Hey all, I just received my gleaming 1.6 in the mail and I didn't think when i ordered it, that the header is a side exhaust header, and I need a wraparound.

    I work in the marine industry so getting an aluminium one made is no problem.

    is there any problem with using aluminium as a header on a gas engine? Will I melt it?

    Curious.

    R

    _____________________________

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    (in reply to dick Hanson)
           Post #: 1306

    RE: mvvs 1.60 gasser carb #'s - 11/27/2006 12:32:00 PM   
    dmccoach


     

    Posts: 41
    Joined: 5/27/2002
    From: Kutztown, PA, USA
    Status: offline     		Hello,

    re: Aluminimum for a header - I use a MACS header (which is alu) and have no problem. These motors do run hot though, watch what you touch after a run.

    Dan

    (in reply to Rendegade)
           Post #: 1307

    RE: mvvs 1.60 gasser carb #'s - 11/27/2006 3:55:15 PM   
    Charley


     

    Posts: 915
    Joined: 12/5/2001
    From: Kerrville, TX, USA
    Status: offline
    quote:

    ORIGINAL: pe reivers

    @ Charley:
    You have the Mk1 silverhead engine. If you have the tools, you can adapt the WA80 carb and manifold (the pieces between carb and engine). Over the years, MVVS only changed carb, manifold and ignition+prop washer. You can order the current parts (WT481D carb, gaskets, manifold). The fit in the crankcase has not changed over the years.



    Pe,

    What needs to be done to the manifold?

    CR

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    Charley
    ccrobins@ktc.com

    (in reply to pe reivers)
           Post #: 1308

    RE: mvvs 1.60 gasser carb #'s - 11/27/2006 11:34:32 PM   
    pe reivers



    Posts: 2622
    Joined: 1/23/2002
    From: Arcen, , NETHERLANDS
    Status: offline     		It should be made to fit the size of the carb butterfly section, so the gas flow is as smooth as possible without restrictions downstream of the carb.

    _____________________________

    Pe, Dealer for MVVS, MTW and Mejzlik; www.mvvs.nl
    There is sanctuary in analisys.

    (in reply to Charley)
           Post #: 1309

    RE: mvvs 1.60 gasser carb #'s - 11/28/2006 6:02:30 AM   
    Rendegade



    Posts: 842
    Joined: 3/19/2003
    From: Perth, AUSTRALIA
    Status: offline     		Hmm, I just realised that I don't have a lot of ground clearance as the plane it's going in has retracts, and it's already built, I know I can swing a 16" prop.

    Would a 16x12 be good enough for pattern?

    Or should I consider a 3 blader?

    Also the firewall is a long way from the nosering, (it used to house a good ol' supercharged 120) can I use a long nylon mount without too much trouble or will I open myself up to problems?



    < Message edited by Rendegade -- 11/28/2006 6:09:49 AM >

    _____________________________

    It's easy to fly, just throw yourself at the ground and miss!

    (in reply to pe reivers)
           Post #: 1310

    RE: mvvs 1.60 gasser carb #'s - 11/28/2006 11:10:45 AM   
    pe reivers



    Posts: 2622
    Joined: 1/23/2002
    From: Arcen, , NETHERLANDS
    Status: offline     		16x12 is fine.
    Use a radial mount #3394 and stand-offs to mount the engine

    _____________________________

    Pe, Dealer for MVVS, MTW and Mejzlik; www.mvvs.nl
    There is sanctuary in analisys.

    (in reply to Rendegade)
           Post #: 1311

    RE: mvvs 1.60 gasser carb #'s - 11/29/2006 12:57:12 AM   
    Rendegade



    Posts: 842
    Joined: 3/19/2003
    From: Perth, AUSTRALIA
    Status: offline     		I think I might have a little trouble getting one of those in time, but I do have access to a lot of aluminium stock, would a 3mm T6 mount work as well? or should I go for 4mm?

    _____________________________

    It's easy to fly, just throw yourself at the ground and miss!

    (in reply to pe reivers)
           Post #: 1312

    RE: 3 blade props - 11/29/2006 3:27:15 AM   
    Ed Cregger



    Posts: 7623
    Joined: 1/31/2002
    From: Ringgold, GA, USA
    Status: offline
    quote:

    ORIGINAL: Daryl Martel

    Graupner makes a very nice 3 blade nylon 15 X 8. It's the biggest 3 blade they make. I have 2 of them. Should work OK on that size engine. Lots of places carry Graupner but Hobby Lobby for sure...



    ----------------


    Where are you buying these Graupner 3-blade 15x8 props, Daryl? I would like to pick up a couple myself.


    Ed Cregger



    _____________________________

    Artisan

    "Flying models since the Fifties - I'll get the hang of this yet!!!"

    (in reply to Daryl Martel)