La/Fp

Embarassed To Ask, But What Does The F/p Stand
For As In La F/p:+

LAST EDITED ON Dec-24-03 AT 04:45 PM (CDT)
 
>Embarassed To Ask, But What Does The F/p Stand
>For As In La F/p:+

Ron, no need to be embarassed, since there are no dumb questions. But, there might be some dumb answers.

Izit "Flippen ze Prop". See what I mean?

I think FP stands for "Friendly Partner", one of those "Jap-english"
phrases. It is on the decal that comes with the motor. No idea about LA though.
Pat MacKenzie

I believe the P in FP refers to its plain bearing..

[photo not recovered: 3e69bb3870f12ad5.jpg]

"Intellectuals solve problems; geniuses prevent them ." -Albert Einstein

>Embarassed To Ask, But What Does The F/p Stand
>For As In La F/p:+

As far as I know, it doesn't mean anything in particular.

LAST EDITED ON Dec-24-03 AT 05:15 PM (CDT)
 
Really?, I thought it was Freggen Powerful. Or is it Friggin Powerful?

LAST EDITED ON Dec-24-03 AT 05:31 PM (CDT)
 
Louisiana federal police.

leon99

perhaps funny people?

DICK BYRON
3325 GALAWAY BAY DR.
GRAND PRAIRIE, TX 75052
972-336-0445

Not even OS knows. They just pull these designations out of a hat. The first I heard of these, the first thing that popped into my evil mind, was Fat Papa and Los Angeles. Don't even try to figure that one out.

"Friendly Partner" is correct!

La who knows

Front Carb.
Plain Bearing.

It's not a dumb question. Most of us just go with the marketing flow.

Way back, OS used an "F" to designate front intake. Then they went to FS, which meant Front intake, Schnuerle porting. Then they went to an FSR in the mid-1970's, which lost most of us. Then they tried FX, now SX. These are all front intake, Schnuerle ported, ball bearing engines and there is a lot of parts commonality among these. I just fixed my 30 year old .25FSR with a new .25FX crank.

The FP came out in the early 1980's and I thought it meant front intake plain bushing (as someone else guessed). IIRC, Paul Walker took the piston and liner from a 40FP and used it with the ball bearing bottom end from a 40FSR engine.

LA? Who knows. (Latest Attempt?) This is a totally new design from OS. The engines seem to run fine, but I'm not a fan of the four-bolt heads and legal eagle rear needle valves.

Ron King

>It's not a dumb question. Most of us just go with the
>marketing flow.
>
>Way back, OS used an "F" to designate front intake. Then
>they went to FS, which meant Front intake, Schnuerle
>porting. Then they went to an FSR in the mid-1970's, which
>lost most of us. Then they tried FX, now SX. These are all
>front intake, Schnuerle ported, ball bearing engines and
>there is a lot of parts commonality among these. I just
>fixed my 30 year old .25FSR with a new .25FX crank.
>
>The FP came out in the early 1980's and I thought it meant
>front intake plain bushing (as someone else guessed). IIRC,
>Paul Walker took the piston and liner from a 40FP and used
>it with the ball bearing bottom end from a 40FSR engine.
>
>LA? Who knows. (Latest Attempt?) This is a totally new
>design from OS. The engines seem to run fine, but I'm not a
>fan of the four-bolt heads and legal eagle rear needle
>valves.
OS is discontinuing the FX and coming out with the 46AX with a 4 bolt head. Is it a LA with balls? That would be Ball Bearings.

Thanks for the tip on the FSR

Yeah, I'm reasonably sure the "F" means "front intake". The first OS Schneurle engine I remember reading about was the rear drum valve intake .40SR. The .40FSR came afterwards. Just conjecture here, but the S probably means "schneurle porting" and the R "ball Race". FP would be front intake plain bearing, perhaps. After this, OS had to come up with new designations for different lines, and maybe they stopped meaning anything, if they ever did.

Makes sense to me, now that I remember from my days living in England. They called them ball races, too.

Back to the Walker setup: He didn't like the rings in the OS engines - they break all the time. I looked at the newer FX engines and they are also ringed. The 40FP was a lapped piston and the 40 FP/FSR combo ran very well. I think we all agreed it was much stronger than the ST .60 and you could fly with smaller lines.

If those new 4x AX engines are ABC or AAC, they might be worth the effort to convert. I have spent some time and energy converting the smaller engines (25 and 32). They are better made, lighter, and are much more powerful than the LA series.

Ron King

Fairly Powerful

Languid Accomplishment

Currell (with time on his hands)

LAST EDITED ON Dec-26-03 AT 02:54 PM (CDT)
 
"They just pull these designations out of a hat."
Looks like Ty hit it on the nose.

Recieved this response on the LA question from
Warwren M.
Product Support Technician, Great Planes

The "LA" does not mean anything specific.O.S. no longer uses an
abreviation to denote side or rear exhaust,front or rear mount carb.

Whadabout the VF, whazaat stand for? They're "Snarly Ported", front intake, rear exhaust, two ball race (TBR) and ABN or ABC. The Japanese are very enthusiastic about their alpha/numeric combinations for their cars and motorcycles. Pretty comical, IMO. Steve

Don't really know what VF means, but VF engines were typically rear exhaust, high RPM, meant for ducted fan or racing use. I think they were rear intake as well, though that may not be the case.

Remember that the Japanese use different alphabets (yes, more than one) AND Chinese characters to write with, not Roman letters. So it is interesting that the sports car labels and such are based on Roman letters. Maybe it's because a lot of this stuff gets exported to places where people can't read Japanese writing, and would have no idea how to pronounce, say, "midori hachi roku" written in hiragana if they saw it on the back of someone's car.

>Embarassed To Ask, But What Does The F/p Stand
>For As In La F/p:+

FP stood for Front intake, Plain bearing.