Notices
Engine Conversions Discuss all aspects of engine conversions in this forum

Stihl 65cc 4-mix on 30% Edge

Old 07-08-2006, 11:11 PM
  #1  
tripp3d
Senior Member
Thread Starter
 
Join Date: Dec 2004
Location: Memphis, TN
Posts: 253
Likes: 0
Received 0 Likes on 0 Posts
Default Stihl 65cc 4-mix on 30% Edge

Here are a few pics of my KMP 30% Edge on maiden flight today...

Stihl 65cc four stroke 50:1 mix
22x10 prop
(5) 200 oz digital hi torque (Tower Pro) servos
(2) Futaba 3004 throttle and choke
7 channel Futaba RX
2500 mah nimh battery

This engine sounds AWESOME!!! Especially at lower RPMs, and has tons of torque. I'm still breaking her in so I was afraid to do any hover type maneuvers, but this thing rolls very axially and flies pattern very well. May try bigger prop, any suggestions other than 24x10?
Attached Thumbnails Click image for larger version

Name:	Ca81884.jpg
Views:	183
Size:	48.5 KB
ID:	488834   Click image for larger version

Name:	Ig11490.jpg
Views:	154
Size:	18.2 KB
ID:	488835   Click image for larger version

Name:	Kh17719.jpg
Views:	160
Size:	15.4 KB
ID:	488836  
Old 07-09-2006, 09:01 AM
  #2  
davewallace
Senior Member
My Feedback: (29)
 
Join Date: Jan 2005
Location: San Antonio, TX
Posts: 1,402
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

Tripp,
Could we get some pictures without the cowl? What is the rpm with the 22x10? Too many questions. Any further details would be great.

Thanks, Dave
Old 07-09-2006, 03:56 PM
  #3  
KenLambert
My Feedback: (106)
 
KenLambert's Avatar
 
Join Date: Dec 2001
Location: Livingston, TX
Posts: 868
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

here are some pics
Attached Thumbnails Click image for larger version

Name:	Lj23316.jpg
Views:	262
Size:	81.4 KB
ID:	489069   Click image for larger version

Name:	Ws56352.jpg
Views:	263
Size:	80.0 KB
ID:	489070   Click image for larger version

Name:	Ej14245.jpg
Views:	242
Size:	68.0 KB
ID:	489071  
Old 07-09-2006, 05:39 PM
  #4  
subarubrat
Senior Member
My Feedback: (1)
 
subarubrat's Avatar
 
Join Date: Apr 2005
Location: Remington, VA
Posts: 685
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

Any chance of capturing the sound? That is a fantastic result, finally a 4 stroke conversion flying an aerobat. Allot of these competition guys are going nuts over noise, what will win out, the result of the conversion engine or the prestige of having the proper popular engine?
Old 07-09-2006, 07:19 PM
  #5  
davewallace
Senior Member
My Feedback: (29)
 
Join Date: Jan 2005
Location: San Antonio, TX
Posts: 1,402
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

Ken,
Great solution for a lefthanded engine. Nice pictures.

Dave
Old 07-09-2006, 09:13 PM
  #6  
KenLambert
My Feedback: (106)
 
KenLambert's Avatar
 
Join Date: Dec 2001
Location: Livingston, TX
Posts: 868
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

that is the engine that is on tripps plane.
Old 07-09-2006, 10:16 PM
  #7  
tripp3d
Senior Member
Thread Starter
 
Join Date: Dec 2004
Location: Memphis, TN
Posts: 253
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

Hey Ken,
I love this engine, thanks again! I have since cut some of the unecessary aluminum off the engine so this thing looks like nothing but cylinder and carb when the muffler is off I wish I could capture the sound of her but I dont have a camcorder.
I stihl haven't tached the engine with the 22x10 and honestly it doesn't appear to be turning all that fast, but it turns it with such authority I think I could even go a little larger, maybe...
(note the .095 weedeater line used for choke and throttle= no glitches)
12 volts wouldn't think about cranking her so I had to get a 24 volt Sullivan. Now it starts so fast its almost scary. I am curious about battery ignition but don't know if I have many options being 4 stroke, plus the mag seems to work pretty well.
Oh btw, I am using lots of expo on throttle b/c of low end power, almost ran me off the runway. I think I just need to adjust linkage at servo to adjust travel, and reduce ATV on Tx.
Engine is off again now as I'm cutting firewall back two inches to fit cowl properly
Here are some pics, one with engine still mounted. was considering Zenoah G62 but since this one is a keeper, the firewall is getting cut and the Stihl is going back on...[>:]
Attached Thumbnails Click image for larger version

Name:	Vs55805.jpg
Views:	239
Size:	35.7 KB
ID:	489286   Click image for larger version

Name:	Da83436.jpg
Views:	237
Size:	37.8 KB
ID:	489287   Click image for larger version

Name:	Db85401.jpg
Views:	263
Size:	34.1 KB
ID:	489288   Click image for larger version

Name:	If10589.jpg
Views:	212
Size:	38.5 KB
ID:	489289  
Old 07-09-2006, 11:02 PM
  #8  
captinjohn
 
Join Date: Jan 2002
Location: Hesperia Michigan, MI
Posts: 12,945
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

What is the big hose going to bottom of carb for? How about vibration at different speeds? I bet the sound is great. The 4 strokes have a longer push on the piston...making more torque. The windows in the cylinder on a 2 stroke....cause a loss of that push. Capt,n
Old 07-09-2006, 11:41 PM
  #9  
NM2K
Senior Member
My Feedback: (14)
 
Join Date: Jan 2002
Location: Ringgold, GA
Posts: 11,488
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

For all the world, that looks like a PCV setup (positive crankcase ventilation) to me. I can see a lot of places to reduce weight on that engine.

How much did the engine cost? TIA
Old 07-09-2006, 11:50 PM
  #10  
tripp3d
Senior Member
Thread Starter
 
Join Date: Dec 2004
Location: Memphis, TN
Posts: 253
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

the hose is an impulse line that uses crankcase pressure to work the fuel pump on the carb.
Vibration is not bad, but a slightly high idle helps, epoxy and tri stock are your friends.
accelerates VERY hard but no blistering top end like the 2 strokes...

Cap'n, I've always liked your quote, and you'll find it holds true with this one.

Old 07-10-2006, 02:51 AM
  #11  
tomservo
Junior Member
 
Join Date: Jun 2006
Location: Grand Forks, ND
Posts: 17
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

From the looks of the ignition setup, there's no timing system other than fire-every-revolution, so there's no reason you couldn't use electronic ignition. I'm sure there would be a nice gain if you used a spark advance as well.

I imagine that hose comes from a difference source than a 2-cycle's fuel pump pulse, since a 4 stroke needs fuel every other rotation - even if there's no air intake the pump will still spurt out fuel as the throttle is still open
Old 07-10-2006, 09:48 AM
  #12  
Antique
Senior Member
My Feedback: (4)
 
Antique's Avatar
 
Join Date: Jul 2002
Location: Somewhere, DC
Posts: 9,825
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

The hose comes from the crankcase just like a two stroke...There is just enough of a pulse to operate the carb...There is a misconception about the pump function in the carb, it just fills the cavity under the diaphragm, it can't pump fuel out of the carb..
There is also a misconception about spark advance, the only engines I know of that benefits from more advance are the FPE engines that were set up at 18 degrees...
Timing at 28 or 30 is the best, there is no noticeable change a few degrees one way or the other from there....Too much advance makes the engine miss, too little makes less power..
Old 07-10-2006, 04:01 PM
  #13  
tripp3d
Senior Member
Thread Starter
 
Join Date: Dec 2004
Location: Memphis, TN
Posts: 253
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

Ralph,
weren't you running a walbro sdc80 on this engine with good results. I ended up using the stock carb and had to mix my choke and throttle servos together to close the choke just a hair at half throttle for max power. adjusted carb but did not help, turned high speed screw out until it fell out in my hand with engine running, and STILL was asking for more gas...
Old 09-18-2007, 11:11 PM
  #14  
drdrain
Junior Member
 
Join Date: Mar 2003
Location: Mill Spring, NC
Posts: 7
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

YES! electronic ignition is VERY possible. just talk to the nice folks at C & H ignitions & they'll build you one. actually, they've already done some conversions on that engine including electronic ignition.

to the guy who was wondering about the "firing every stroke" factor... yes, the spark plug fires every stroke, but the valve train only introduces air/fuel mix every other stroke.

the 'large hose' from the crankcase... it uses the crankcase pressure to 'supercharge' the engine so to speak. exact same principle as the YS 4 stroke engines. in fact, wouldn't surprise me at all if StihL didn't copy the YS design. they were the first to do this. 4 stroke heaven? would be if Saito & StihL would 'hook up' and design a super light weight, high compression, methanol powered version of this engine. then comes 80 & 90cc versions. weeeeeeee
Old 09-19-2007, 09:33 AM
  #15  
spiffymafied
Member
 
spiffymafied's Avatar
 
Join Date: Oct 2004
Location: Mansfield, MA
Posts: 57
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

That is a nice looking engine. What would that have come out of? I'd like to find one.
Old 09-19-2007, 11:00 AM
  #16  
MSS999
Senior Member
 
Join Date: Nov 2005
Location: SuffolkSuffolk, UNITED KINGDOM
Posts: 106
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

Stihl BR550 or BR600 backpack blower.
Old 09-19-2007, 12:42 PM
  #17  
DKjens
My Feedback: (50)
 
DKjens's Avatar
 
Join Date: Feb 2002
Location: Pasadena, CA
Posts: 2,097
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge


ORIGINAL: drdrain

YES! electronic ignition is VERY possible. just talk to the nice folks at C & H ignitions & they'll build you one. actually, they've already done some conversions on that engine including electronic ignition.

to the guy who was wondering about the "firing every stroke" factor... yes, the spark plug fires every stroke, but the valve train only introduces air/fuel mix every other stroke.

the 'large hose' from the crankcase... it uses the crankcase pressure to 'supercharge' the engine so to speak. exact same principle as the YS 4 stroke engines. in fact, wouldn't surprise me at all if StihL didn't copy the YS design. they were the first to do this. 4 stroke heaven? would be if Saito & StihL would 'hook up' and design a super light weight, high compression, methanol powered version of this engine. then comes 80 & 90cc versions. weeeeeeee
It doesn't look like this engine uses a supercharging principle. It looks like the carb is attached directly to the head. It is a brilliant idea though, to attach the carb via a reed valve to the crankcase, and then run an intake runner from the crankcase via another reed valve to the intake port. This would take care of lubricating the bottom end of the engine as well as pressurizing the intake mixture.
Old 09-21-2007, 11:59 PM
  #18  
camcclellan
Senior Member
 
Join Date: Jun 2006
Location: Tuckerman, AR
Posts: 102
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

Tripp3d

Do you go to the giant scale fly in at Hot Springs AR Oct, 12, 13 and 14. If so let me know so can be looking for you. I would like to see this set up.
Old 09-22-2007, 07:11 PM
  #19  
erik58
My Feedback: (4)
 
Join Date: Jan 2003
Location: easthaven, CT
Posts: 212
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

has anybody tryed the 25cc? 4-mix ? thanks Erik
Old 09-22-2007, 07:14 PM
  #20  
erik58
My Feedback: (4)
 
Join Date: Jan 2003
Location: easthaven, CT
Posts: 212
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

has anybody tryed the 25cc? 4-mix ? thanks Erik
Old 09-22-2007, 11:52 PM
  #21  
drdrain
Junior Member
 
Join Date: Mar 2003
Location: Mill Spring, NC
Posts: 7
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

check out the animation on StihL's website. it shows it clearer than I can explain it in words. but in the long run? they force feed the fuel air mix using the pulses from the crank case.

Old 09-23-2007, 10:35 AM
  #22  
DKjens
My Feedback: (50)
 
DKjens's Avatar
 
Join Date: Feb 2002
Location: Pasadena, CA
Posts: 2,097
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

drdrain,
I've been on stihlusa.com and have not found any animation or other that explains that their 4-strokes work that way. I know exactly the principle you are talking about, and I believe a European engine manufacturer made a 4-stroke using this principle. The particular engine in this thread does not look like it operates that way, I mean, the carb. is attached on the head, not the crankcase, and there is no visible manifold running from the crankcase to the head.

Ig you have a link you can post, I'd be more than happy to look into it.

DKjens
Old 09-23-2007, 11:50 AM
  #23  
MSS999
Senior Member
 
Join Date: Nov 2005
Location: SuffolkSuffolk, UNITED KINGDOM
Posts: 106
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

Try this

http://www.stihl.ca/4mix/francais/videos/video4mix.htm
Old 09-23-2007, 11:56 AM
  #24  
MSS999
Senior Member
 
Join Date: Nov 2005
Location: SuffolkSuffolk, UNITED KINGDOM
Posts: 106
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

And for for the equivalent Shindaiwa C4 can be downloaded from here.

http://www.t2500.com/downloads/index.html
Old 10-07-2007, 12:47 AM
  #25  
drdrain
Junior Member
 
Join Date: Mar 2003
Location: Mill Spring, NC
Posts: 7
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stihl 65cc 4-mix on 30% Edge

there used to be a place on stihL's site where you could view an animation of the innerworkings of this engine while running. I got a good look at it about a week ago while at a friends' house. I was WRONG about the hose. it only operates the pump, just as tripp3d says. however, in the diagram, it shows the crankcase pressure being 'pumped' past the valve train, building pressure, then releasing into the intake valve. has anyone else seen this animation? past a link on here perhaps?

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.