Engine Conversions Discuss all aspects of engine conversions in this forum

Super Tigre ST 3000 Gas Conversion

Reply
Old 03-13-2010, 04:32 PM
  #1
nitrometan
Thread Starter
 
Join Date: Jun 2005
Location: Suceava, ROMANIA
Posts: 31
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Super Tigre ST 3000 Gas Conversion

Hi everybody.Today I started my converted ST 3000 equiped with Walbro 28 size WA99B (Stihl Chainsaw) ,RCEXL ignition,rimfire spark plug.Oil to Gas ratio 12:1,temperature outside 5 celsius.
With Menz 19X8 7200 rpm,18X10 7450 rpm,canister muffler,about 200cc volume,12mm exhaust diameter.
My questions to you all my friends:
I can hold a steady 1600 rpm idle,but after a prolonged WOT engine stops.If I set idle to 2000 rpm,no more problems.Any Fixes?
After 4 hours of running at various rpm,I inspected inside the engine,it is shiny clean and no traces of anything.VERY oily everything.Can I lower the oil content to about 16:1 ?Oil used is common chain saw type,nothing expensive synth oil.
I did following modifications:On upper side of connecting rod i made 2 more oil holes 1.2mm diameter 30 degrees left and right of existing one,on big end I made 4 holes 1,2mm spaced equally left and right of existing hole.Advance timing is critical:32 degrees.3-4 degrees more or less are very significant in top end rpm gain or loss.
I forgot,the engine is old and used,but still good compression.
nitrometan is offline  
Reply With Quote
Old 03-14-2010, 12:22 AM
  #2
w8ye
Moderator
 
w8ye's Avatar
 
Join Date: Dec 2001
Location: Shelby, OH
Posts: 37,532
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Super Tigre ST 3000 Gas Conversion

When it quits it must be too lean

Everyone runs 16:1 when using gas on these.
w8ye is offline  
Reply With Quote
Old 03-14-2010, 01:58 AM
  #3
nitrometan
Thread Starter
 
Join Date: Jun 2005
Location: Suceava, ROMANIA
Posts: 31
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Super Tigre ST 3000 Gas Conversion

Tnx for reply,I must to tell you that I found the sweet spot on L setting and the idle speed I set with butterfly screw only.Quite smokey,does not seem to be lean.Has same performance as DLE 30.DLE 30 also quits if idle is set under aprox.2000 rpm,all this at good L setting.
YO8SSD
nitrometan is offline  
Reply With Quote
Old 03-19-2010, 01:18 PM
  #4
nitrometan
Thread Starter
 
Join Date: Jun 2005
Location: Suceava, ROMANIA
Posts: 31
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Super Tigre ST 3000 Gas Conversion

Today i made new tests.Here is a video.
http://www.youtube.com/watch?v=mj9D7B1ylms
nitrometan is offline  
Reply With Quote
Old 03-19-2010, 02:44 PM
  #5
KenLambert
 
KenLambert's Avatar
 
Join Date: Dec 2001
Location: Livingston, TX
Posts: 868
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Super Tigre ST 3000 Gas Conversion

I run mine at 50:1 ratio with out any problems
KenLambert is offline  
Reply With Quote
Old 03-19-2010, 03:02 PM
  #6
nitrometan
Thread Starter
 
Join Date: Jun 2005
Location: Suceava, ROMANIA
Posts: 31
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Super Tigre ST 3000 Gas Conversion

Well sir,I understand that,but I still have Bronze bushing in connecting rod.Otherwise the engine is absolutely clean inside and does not overheat excesively.I wish I have your maschining facilities,but we are living in a country where such machines are hard to find.I apreciate your work which inspired me a lot.Please keep going...
nitrometan is offline  
Reply With Quote
Old 03-19-2010, 03:31 PM
  #7
w8ye
Moderator
 
w8ye's Avatar
 
Join Date: Dec 2001
Location: Shelby, OH
Posts: 37,532
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Super Tigre ST 3000 Gas Conversion

The engine sounded pretty good after you set the needle

Post some more videos when you run it more
w8ye is offline  
Reply With Quote
Old 03-19-2010, 05:30 PM
  #8
nitrometan
Thread Starter
 
Join Date: Jun 2005
Location: Suceava, ROMANIA
Posts: 31
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Super Tigre ST 3000 Gas Conversion

Another video...

http://www.youtube.com/watch?v=jIK51Bw9xRI
nitrometan is offline  
Reply With Quote
Old 04-10-2010, 04:30 PM
  #9
PlaneKrazee
 
PlaneKrazee's Avatar
 
Join Date: May 2002
Location: Gales Ferry, CT
Posts: 4,876
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Super Tigre ST 3000 Gas Conversion

Nice job!
PlaneKrazee is offline  
Reply With Quote
Old 04-24-2010, 12:18 AM
  #10
Maximiliano Galvez
 
Maximiliano Galvez's Avatar
 
Join Date: Mar 2009
Location: Mexico, MEXICO
Posts: 163
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Super Tigre ST 3000 Gas Conversion

Congratulations Nice Job

I tested Rinfire, SAito AND mine "Rcexl" Spark plugs
Really, not because is my brand but i get 200 rpm more than rimfire and saito spark plugs and a easy starting

http://www.youtube.com/alephterranova#p/u/4/uXlvWZjEr9o

Regards
MAx
Maximiliano Galvez is offline  
Reply With Quote
Old 04-14-2013, 07:15 PM
  #11
flyboydale54
 
Join Date: Apr 2009
Location: Antwerp, NY
Posts: 56
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Super Tigre ST 3000 Gas Conversion

I see 3 things I would change. Try a real muffler, put a stack on the carburator, this will stop the blow-by out of the carburator and the engine will be more consistent. Raise the fuel tank to the centerline of the engine. You are trying to draw the fuel up way too far.
flyboydale54 is offline  
Reply With Quote
Old 04-15-2013, 10:01 AM
  #12
av8tor1977
 
av8tor1977's Avatar
 
Join Date: May 2003
Location: Tucson, AZ
Posts: 6,992
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Super Tigre ST 3000 Gas Conversion

Fuel tank level has little to no effect on Walbro or Zama pumped carbs.

AV8TOR
av8tor1977 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 09:22 AM.