Just talking about VWs

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plncraze

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Cessna 182's ice up if you give a cold stare.
Seriously though is the carb body also warmed by the engine?
 

Dana

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The Cherokee 140 has a Lycoming, doesn't it? With the intake manifold running through the oil pan the carburetor stays warmer so they don't normally need heated air.

The Zenith carbs used on many VWs are known ice makers. Other carbs may be different. I had heat on the Zenith on the Mosler 1/2VW in my Fisher and used it like you would on a Cessna, on the advice of the original builder. It also helped to keep the engine running when cold, until those long intake pipes warmed up a bit.
 

lakeracer69

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Pop,

My Great Plains 2276CC with Revflow carb Cygnet cruise quite nice at 19.5inches of MP and 2850-2900 rpm. I believe about 45hp. 58x34 Ed Sterba Prop CHT ~305-315 on a 80 degree ambient. I climb to TPA at full power and back off to a cruise climb as needed to stay under 330f. The Cygnet flies great with two large souls and full fuel. I had a stud break after solo and made a precautionary landing without incident. On investigation I suspect the flaw was introduced when doable nutting the stud to install.. I decided to replace all studs with rolled 4130 studs and put new 040 heads from Mofoco. Standard valve size heads. Works great!

https://www.youtube.com/results?search_query=nx237f

Please share more about your circuit that automatically switches in the bleed down electric system. Pictures of your fly wheel drive will always be appreciated.

Matt


Matt
Matt,

What spark plugs (brand/number) are you using in your engine?

Do you use all the same matching plugs for the magneto and the electronic ignition?

Thanks
 

lakeracer69

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A question for Pops. When you are building something like a 2180cc motor, what rod length would you use? I see some folks use the stock length and some go for longer to get close to a given "rod ratio". I'm trying to get my head around what "rod ratio" is correct for a 2180 stroked motor.

Pros and Cons for both using regular length and longer length rods? Would H beam rods be a good choice as well?

Thanks
 

don january

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Here is a VW question. I have the very early style transaxle on my Trike and need to remove the axles but no snap ring in site. any body have knowlage on how to remove axles???Vw-Type-1-2-3-Bug-Bus-Ghia.jpg
 

103

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Wauwatosa WI
Matt,

What spark plugs (brand/number) are you using in your engine?

Do you use all the same matching plugs for the magneto and the electronic ignition?

Thanks
Not all were matching form factor so no.

Since I had a MAG on top I had Mofoco make those holes 14mm I use Autolite 2304 for about $8 each at O-Reilly Auto Spruce and Aircraft Parts. ;-)

I had an issue after installing the heads they require a 18mm reach and my "fine wire" aircraft plugs were only 12mm reach. Actually not a single shielded "14mm Aircraft" plug came in 18mm reach. Hummel Engine's Scott Casler was a fine man providing a solution and I never been a customer of his. Scott is a open book saving the day with the AUTOLITE 2304. Fred Keip of Sonerai fame confirmed the Autolite 2407 has 1/2" /12mm reach, owns a set and will install them on his magneto when the AC plugs reach the end of life.

I use 12mm NGK 3932 18mm reach below for the electronic ignition it s resistor plug with copper wires this combination attenuates radio noise well. Great Value at $2.69 a piece and O-Riley Spruce and Aircraft Parts.

MOFOCO built a fixture and puts the 12mm plugs in below on an angle to avoid the pushrods tubes. No issue with tool access like my previous head with 10mm plugs between the pushrod tubes. I had to make a trimmed down socket for those.

Based on my experience I would highly recommend you do business with Scott @Hummel and if buying heads from MOFOCO stick with the standard valve size on the 040A and plan to spend 1 hour with a hack saw and rat tail file set polishing any flash between the fins out. It was not much effort and every bit a flow you achieve will pay cooling dividends. No large valves are needed below 3500 RPM. Stock on 040A 40mm x 35.5mm stainless steel valves...better still order ala-cart have them duel plug the heads and use Stainless 35mmx32 valves.

My four "AC Fine wire" plus are available contact me offline if you care to make an offer. They are crazy expensive new. I recommend the new Autolites on a MAG great value!

Regards

Matt


REF Oreilly Auto and Spruce
https://www.oreillyauto.com/detail/b/copper-core-2846/ignition---tune-up-16776/spark-plugs---specialty-16898/spark-plugs---industrial-power-equipment-engines-19474/e881b229517f/autolite-copper-core-spark-plug/2304/2511374

Mofoco 040A head is stock with four 12mm spark plug holes and bored for 92mm jugs, Talk to them if you needs differ. Not the A on the end is for Airplane they know what you are doing and care about you.

https://www.mofoco.com/item/Mofoco_040A_40mmX35_5mm_Cylinder_Head_12mm_spark_plug_holes_92mm_bore_/3520/c52

If you are not locked into 14mm plugs and can use 92mm jugs there is advantage to a Stock 040A. Every time I have been in the store there was a stock o40A behind the counter. Lead time would be shipping and handling only unless someone bought the spec built set.

Ala Cart to achieve 35x32 valves.
https://www.mofoco.com/item/Mofoco_040_Dual_Port_New_Cast_Stock_Cylinder_Head_SCORE_APPROVED_/237/c152


For the smaller builds <1834cc I would look at POPS New Single Port recommendation.

https://vwparts.aircooled.net/Single-Port-Cylinder-Heads-COMPLETE-15-1600-p/sp-cylinder-heads-pr.htm

I bet Mofoco will punch new 12mm holes in them if you have them shipped there.Mofoco dual 12mm plug option.jpg
 
Last edited:

don january

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TFF
You have to remove those boots first. Those look like repair boots.
I have the boots removed also the axle tubes are removed with just the axles hanging in the wind but there is no snap ring like the newer swing arm tranny. Its a real head scratcher at this point and can find no reference on utube ?
 

fly2kads

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Justin, TX
Here is a VW question. I have the very early style transaxle on my Trike and need to remove the axles but no snap ring in site. any body have knowlage on how to remove axles???
This is way off topic for HBA, but here goes....

I haven't ever messed with a split case transaxle, just the later swing axles on my '66 Beetles. My understanding is that these do not have the snap ring like the later units. You have to take the differential section apart to get the axles out. See this thread on the Samba: https://www.thesamba.com/vw/forum/viewtopic.php?t=470929

Back to aircraft topics....
 

lakeracer69

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Dec 10, 2008
Messages
152
Location
New Hampshire
Not all were matching form factor so no.

Since I had a MAG on top I had Mofoco make those holes 14mm I use Autolite 2304 for about $8 each at O-Reilly Auto Spruce and Aircraft Parts. ;-)

I had an issue after installing the heads they require a 18mm reach and my "fine wire" aircraft plugs were only 12mm reach. Actually not a single shielded "14mm Aircraft" plug came in 18mm reach. Hummel Engine's Scott Casler was a fine man providing a solution and I never been a customer of his. Scott is a open book saving the day with the AUTOLITE 2304. Fred Keip of Sonerai fame confirmed the Autolite 2407 has 1/2" /12mm reach, owns a set and will install them on his magneto when the AC plugs reach the end of life.

I use 12mm NGK 3932 18mm reach below for the electronic ignition it s resistor plug with copper wires this combination attenuates radio noise well. Great Value at $2.69 a piece and O-Riley Spruce and Aircraft Parts.

MOFOCO built a fixture and puts the 12mm plugs in below on an angle to avoid the pushrods tubes. No issue with tool access like my previous head with 10mm plugs between the pushrod tubes. I had to make a trimmed down socket for those.

Based on my experience I would highly recommend you do business with Scott @Hummel and if buying heads from MOFOCO stick with the standard valve size on the 040A and plan to spend 1 hour with a hack saw and rat tail file set polishing any flash between the fins out. It was not much effort and every bit a flow you achieve will pay cooling dividends. No large valves are needed below 3500 RPM. Stock on 040A 40mm x 35.5mm stainless steel valves...better still order ala-cart have them duel plug the heads and use Stainless 35mmx32 valves.

My four "AC Fine wire" plus are available contact me offline if you care to make an offer. They are crazy expensive new. I recommend the new Autolites on a MAG great value

Great info Matt

Thanks
 

103

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Joined
May 2, 2015
Messages
235
Location
Wauwatosa WI
Pop,

My Great Plains 2276CC with Revflow carb Cygnet cruise quite nice at 19.5inches of MP and 2850-2900 rpm. I believe about 45hp. 58x34 Ed Sterba Prop CHT ~305-315 on a 80 degree ambient. I climb to TPA at full power and back off to a cruise climb as needed to stay under 330f. The Cygnet flies great with two large souls and full fuel. I had a stud break after solo and made a precautionary landing without incident. On investigation I suspect the flaw was introduced when doable nutting the stud to install.. I decided to replace all studs with rolled 4130 studs and put new 040 heads from Mofoco. Standard valve size heads. Works great!

https://www.youtube.com/results?search_query=nx237f

Please share more about your circuit that automatically switches in the bleed down electric system. Pictures of your fly wheel drive will always be appreciated.

Matt


Matt
POPS has me convinced I stumbled into a great rare combination of big wing area and clean air frame that makes the Cygnet SF2A a good two seater powered by a VW. I removed a restriction in the air intake and now pull 20.2 inched of mercury at 2900 engine runs slightly richer and cooler unless I lean out on CC. The big benefit is Climb 3300 vs 3150 (same Ed Sterba 58x34 prop now 7.6:1 CR vs 8.7:1 the K&N restriction was bad!) and I am at Traffic pattern altitude just before I turn down wind. Used to be just as I approach my decent I would pull back to pattern power for 2-4 seconds just to level out then pull back to 2100dual or 1800 solo. All my landings have improved by hitting the key slot at TPA and planning my glide path only based on wind correction. I got Solo Endorsed on a Friday and landed 125 times solo by Monday. Finally feels routine upto 5mph CW. Ground roll is about 150 feet more with two souls and TPA just after turning down wind! Simply great! Not STOL but not marginal even if OAT is 95f. With OAT 95f I climbed to 3500 and the warmest head stabilized around 340f between 2900-3500 feet

With the restriction gone I have proper mixture across the range I now cruise between 260-285 CHT. Climb appear not to be limited to practical daytime VFR heights by the cylinder heads. Oil Temp was 175 and still rising as I approached 3500 my airport is at 850. I am done sorting the intake now I only need to correct the carb heat that was likely restricted to compensate for the K&N restriction.

Last flight of the week ASI went wonky bouncing around reporting 90 when attitude says 70. New one shows up Monday and I will get back to flying!

Matt

PS Videos were for my CFI but open for all to enjoy! The Cygnet SF2A is a room with a view in the sky!

 
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Pops

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That last video was with about a 7or 8 mph 90 deg crosswind.
You do have a very nice 2 place VW powered airplane. Fun, Fun, enjoy .
 

Dana

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Wow! I always thought the Cygnet was rather strange looking (and admittedly it is), but now I get it. All that wood, the view from inside is gorgeous.
 

103

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Messages
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Location
Wauwatosa WI
That last video was with about a 7or 8 mph 90 deg crosswind.
You do have a very nice 2 place VW powered airplane. Fun, Fun, enjoy .
Winds did pick up officially it was a 5mph component or less per my Solo Endorsement :) ...
 

103

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Wow! I always thought the Cygnet was rather strange looking (and admittedly it is), but now I get it. All that wood , the view from inside is gorgeous.
It is a Classic steel tube fusealge wood wing airplane. Wanted to keep with the charm of the plane. Simple clean wood panel ( nautical brite work) with Steam Primary and a few modern electronics. The Human factors were a great improvement for me fitting the engine controls to my body and keeping logical separation. On the old panel I pulled Mixture out instead of carb heat initiating a decent. Got my attention real quick and no harm but it did make me think about a layout change. The panel I pulled was beautifully made black aluminum but did not have an altimeter and made me punch my CFI in the belly with operating the throttle. Looks simple but with fabrication and all new wiring I suspect 120-150 hours, the work was very enjoyable. I like the result! gorgeous hits on it but it is also soothing. Great decompression after work!
 
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Pops

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It is a Classic steel tube fusealge wood wing airplane. Wanted to keep with the charm of the plane. Simple clean wood panel ( nautical brite work) with Steam Primary and a few modern electronics. The Human factors were a great improvement for me fitting the engine controls to my body and keeping logical separation. On the old panel I pulled Mixture out instead of carb heat initiating a decent. Got my attention real quick and no harm but it did make me think about a layout change. The panel I pulled was beautifully made black aluminum but did not have an altimeter and made me punch my CFI in the belly with operating the throttle. Looks simple but with fabrication and all new wiring I suspect 120-150 hours, the work was very enjoyable. I like the result! gorgeous hits on it but it is also soothing. Great decompression after work!
I also like the instrument panel . No trouble seeing over the nose being a taildragger.
The only thing I would change would be me in the left seat.
 
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