Motus V4 Liquid cooled 4-stroke

[Lee Scatt]

This looks promising. The engine manufacturer has an impressive resume. http://www.katechengines.com/katech_inc/news_release.php?id=60P.S.The link has a corrupt file and the specs are not available. I saw this initially in Rider magazine, they spec it as a 90 degree, 1,650 c.c., OHV, two valve/cyl., direct injection with 11.5 :1 compression ratio. It is developed for a sport tourer, so it should be reasonably light.

[Brent_Brown]

11.5 to 1 is high for pump gas.

[Lee Scatt]

I thought that also, but with direct injection it might be possible.
I have tried to dig up more info on this, but it has been kept secret and not much is available.

[Brent_Brown]

What is the price ?

[Penguin]

Lee - Pump Gas?
I'm admittedly a newbie, but what does the "av" in av gas stand for?
I truly don't understand why anyone would use pump gas in an aircraft.
To protect the catalytic converter?
I'm just saying ...

[Lee Scatt]

Hi Larry, I think Brent was commenting on that because the engine is being developed for a domestic built sport touring bike. It would burn mogas.
I burn avgas just for the smell of it.

[Vance]

Lee - Pump Gas?
I'm admittedly a newbie, but what does the "av" in av gas stand for?
I truly don't understand why anyone would use pump gas in an aircraft.
To protect the catalytic converter?
I'm just saying ...

Hello Larry,

100 low lead also known as Av gas can damage some of the sensors for electronic fuel injection and this makes automotive gas more alluring for engines with electronic fuel injection. Neither my car nor my truck would run for long on Av gas.

The led also fouls the spark plugs and contaminates the oil.

For some just the cost savings of Mo gas is worth the risk and trouble.

Mo gas has a longer shelf life.

I use 100LL in the Predator becausethe engine is designed for it and I use oil with an additive package that is formulated to deal with the lead.

I have yet to find any water or containments in the fuel I have purchased at the airport and it always seems fresh.

Thank you, Vance

[Penguin]

Thanks, Vance.
Valid points, all.
You are correct about lead incompatibility with fuel injection sensors, but only the O2 (lambda) sensor I think. Everything else is upstream.
I'm curious, though - are the folks running EFI engines on their gyros using O2 sensors?
To me the EFI is VERY attractive but only if you can dynamically adjust mixture through a lambda sensor.
Some O2 sensor manufacturers are now claiming they are lead tolerant.

[Vance]

Thanks, Vance.
Valid points, all.
You are correct about lead incompatibility with fuel injection sensors, but only the O2 (lambda) sensor I think. Everything else is upstream.
I'm curious, though - are the folks running EFI engines on their gyros using O2 sensors?
To me the EFI is VERY attractive but only if you can dynamically adjust mixture through a lambda sensor.
Some O2 sensor manufacturers are now claiming they are lead tolerant.


Your welcome Larry.

I underestimated your level of knowledge based on your question, my apologies for underestimating you.

I am not current on electronic fuel injection so my information is out of date. At Sun n Fun several of the vendors were bragging about their electronic fuel injection’s lead tolerance. None of them seemed particularly astute but I may have underestimated them also. They may have been adjusting their talking points down to what they perceived to be my level of understanding. Some of the claims did not seem reasonable to me and they backpedaled when I pressed.

My Lycoming IO-320 B1A has a fuel injection that is entirely mechanical and senses mass flow in a very rudimentary way. It has no way to know how it did with the mixture.

It seems to be very reliable and there are many STCs for running automotive gas.

We ran a similar system on the turbocharged alcohol burning automobile engines in the 70s so it is very versatile.

Thank you, Vance