MVVS Support Get support from 3 qualified MVVS Forum Hosts. Dar Zeelon, representative from Israel. David Moen, representative from Canada. Pe Reivers, representative from Netherlands.

MVVS Twins

Reply
Old 06-07-2011, 01:18 PM
  #26
fiery
 
Join Date: Feb 2002
Location: Hervey Bay Queensland, AUSTRALIA
Posts: 2,905
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: MVVS Twins

Hi Fujiman!

I acquired one of these engines not long after we exchanged a few emails a while ago.

For my other thoughts on fuel distribution, please jump to the "MVVS Twin" thread in the "Everything Diesel" forum.

I will follow the deflector route, but will secure it to the plinth with two small countersunk head machine screws or similar.

My engine was received 2nd hand. However, it has fantastic compression and the desirable black factory pitts silencers. The intake hole in the plinth has been bored out to circular by a previous owner. I am in two minds about the benefit of that. What you say is true ... but, also, the engine will only flow as much fuel as the reeds can admit. If the factory thought it would have been worth it, they would have made the intake circular, which when you consider it is a much more straightforward manufacturing step.

Food for thought there.

If mine does not work well, I will make an inverted "top hat" countersunk into the plinth, and plug the intake, and then mill the intake aperture back to as near to factory as I can get it! Hopefully that will not be required.

fiery is offline  
Reply With Quote
Old 06-07-2011, 01:42 PM
  #27
pe reivers
 
Join Date: Jan 2002
Location: Arcen, , NETHERLANDS
Posts: 6,571
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: MVVS Twins

whenever I work on reeds for tuning, I trumpet shape the intake duct toward a shape about 1mm inside the reed outline, just like in 4-stroke valve tuning. That way I have max reed operating pressure, max flow area, and lowest flow velocities at the reed circumference. These velocities tend to shut/restrict the reed valve due to Bernoulli effects.
These effects also can be used to direct the main flow path if required, without restricting the flow like a baffle would do.
pe reivers is offline  
Reply With Quote
Old 06-07-2011, 03:01 PM
  #28
fujiman
 
Join Date: Aug 2008
Location: Keizer, OR
Posts: 555
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: MVVS Twins

hi pe, i think i understand, but could be clearer on what you said with maybe a diagram drawn and posted here. your expertize is always a big help here on rcu. thanks, bill b. (fujiman)
fujiman is offline  
Reply With Quote
Old 06-07-2011, 03:15 PM
  #29
pe reivers
 
Join Date: Jan 2002
Location: Arcen, , NETHERLANDS
Posts: 6,571
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: MVVS Twins

No pictures available.
Just draw the reed outline. Then shape the inlet duct to stay 1mm clear of the outline, so the reed has some flat sealing surface left.
Smooth curves in the duct approaching the reeds provide better flow.
Shaped thus, the reeds will lift sooner, and also close sooner to avoid blowback.
pe reivers is offline  
Reply With Quote
Old 03-26-2012, 10:42 AM
  #30
MAJOR SPLAT
 
Join Date: Jun 2007
Location: , UNITED KINGDOM
Posts: 152
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: MVVS Twins

Hi Guys

I have just purchased a 1.44 twin with headers its 2nd hand and has the walbro type glow carb fitted, where can i get some effective silencers for this engine and what prop do you recomend as i have no instuctions.

Regards

Major Splat.
MAJOR SPLAT is offline  
Reply With Quote
Old 03-27-2012, 01:33 AM
  #31
pe reivers
 
Join Date: Jan 2002
Location: Arcen, , NETHERLANDS
Posts: 6,571
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: MVVS Twins

The 10cc muffler parts are used for this twin.
Do a forum search for general information. A lot has already been written.
http://search.rcuniverse.com/search....+twin&start=30

pe reivers is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 04:55 PM.