Hello,
I am flying in France at Cherbourg. I am interested with the MVVS 160 IFS (26cc petrol), the same as EVOLUTION 26 GTII. Some peoples, in France, sayd me that there is some problems with the new ignition "ICU LITE" and advise me to get the VLACH ignition. It seems to be impossible to find new motors with the VLACH ignition.
Have you some experience with the ICU LITE ignition and what do you think about it.

Thanks.

Pierre.

I just replaced an ignition on a MVVS 35cc...the one it had was a small rectangular black box....the trigger is not a Hall sensor, it had only 2 wires and was timed close to TDC...It didn't work...Replaced it with a RC EXL...Had to put another magnet in the hub to time it at 28 BTDC...Works great now...

Ralph,
You probably had a very old MVVS which had the small black plastic potted ignition with flange mounting and 4 cells NiCad for Voltage. A lot has changed since then. The latest ignitions have two magnets, one leading the other by 120 degrees. These should be used with 6 cells NiMH or two cells LiPo for the S- and L-versions (6.5 - 8.5 Volts). The P-version needs 3xLiPo or equivalent number of NiMH cells (9x)
For a manual of the latest ignitions, see http://mvvs.nl/MVVS/ICU-V1.5.pdf

The RC-Excl ignition needs about 40 degree lead in the single magnet, not 28 degree. It needs the extra 12 degree for it's timing calculations at full rpm, and retards about 35 degree at idle rpm. They need a fairly fast starting flip in order to retard well and not to kick back.
At least the ones I tested were timed like this. Very good ignitions indeed. I made an adjustable magnet ring to experiment with the timing. 40° magnet position BTDC was best for low idle and WOT running.

Strange...I'll have to try one at 40, I have been using 28 and had good results.
The one I put on the MVVS35 was set at 28, ran well....I put a magnet on the other side of the hub and drilled and tapped new holes to mount the sensor...

I turn down the prop washer part adjacent to the engine, and make a ring with the magnet(s) to slip over the turned down part. With two grub screws, I can then position the ring as required. With a 2-magnet hub at i.e. 120 degrees, all it takes is switch the ring around to alter magnet N/S orientation relative to the engine rotation. A totally different ignition then just needs a new ring. The sensor stays where it is now, or any other convenient place.

Had to change to a Hall sensor, the one on the igniton had only 2 wires...RC EXL ignitions come with 2 different sensor mounts, so it was easy enough to tap the 2 holes to mount it on the other side...And now it uses a Champion RDJ7Y or NGK BPMR6F...Slightly longer and does away with the cup under the spark plug for the shielded cap...

Hey Ralph,

Are you still doing the G-62 conversions (ignition, weight reduction, etc)? I'd be interested in either having you do it, or buying a kit from you if you sell them. Lemme know.

Thanks,

Forrest

Yes, still at it......3 62s here today, + one G26, a hub for a Brison 5.8, trying to make a 3W 200 run + a few others..
sorry, no kits, I machine the case for the sensor mount and make a cup mount...
C&H has DIY kits....Maybe BCMA also....

So what's the net weight savings from stock?

Haven't weighed a stock one in a long time, the G62 lite weighs 4 lbs 1 or 2 oz without muffler...a battery will weigh about 2 oz....

I believe the first MVVS gassers had a coil pickup sensor, not Hall. Later models all have hall sensors.
I like the lower / upper boot setup better. It completely encages the spark plug and uses a standard RDJ7J plug (topped off). Sometimes the lower boot tended to leak ever so slightly, but overall, the setup was very neat, especially the later models. These have the same setup as ZDZ.
The newest engines have discarded the lower boot system, and use CM6 plugs with a push on cap and either 2S (L- and S-versions) or 3S (P-version) LiPo cells for power.

Some information please.
MVVS 1.60 with the "new" ignition module as opposed to the "Vlach" one.

The Vlack system was very easy to install and undrstand. I have incomplete instructionwith my newer 1.60 and would like to know what the installation sequence is.
I notw with the instructions I have,that mention is made of wiring ignition moudle into throttle channel direct with usage of a choke rprogram to set the module up etc.
The 1.60 doesn't have the same carbie/choke as depicted in instructions
Also a l.e.d. lead.
Without being referred to users instructions on manufacturers sites, could I ask an Mvvs user to give me a run thro' on setting up and running please
thanks
John S

The 160 has the L-version, which is just as plug and play as the Vlach ignitions, Hook up 6 (SIX!!!) Nicad cells with a switch in between battery and ignition and go fly.

I ordered a strobe light, which will arrive in a week or two. I also made an ignition test bench with variable motor driving the magnet wheel so I can watch the advance at different rpm. We will know soon what is what.
The 40 degree setup is expained [link=http://www.rcuniverse.com/forum/m_4512017/tm.htm]here[/link], and is consistent with the chinese engines I tested.