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Mellowdave · Mar 30, 2009, 02:41 PM

I have an old engine I'm trying to sell. The box says OS Max 15 FP, but someone told me it's just an "OS Max 15". Is there a difference?

What does FP mean.... sleeved bearing or something? Before the FP's came out did they have an OS Max 15 and how would I be able to tell the difference.

I don't know to much about fuel engines so any information would be appreciated.

Thanks!

Jeffery · Mar 30, 2009, 02:53 PM

Here's a pic of each.

Mellowdave · Mar 30, 2009, 03:57 PM

Thanks for the pics. The only difference I can really see is that where the marking on the cylinder is on a raised area on the FP, and not on the other. I wonder what the differnce is internally? Is one engine better than the other? Would one be worth more than another?

Thanks again.

MerlinV · Mar 30, 2009, 04:28 PM

What are you asking for it Dave?

Cheers,

Hugh

MOUNTAINROAD · Mar 30, 2009, 07:45 PM

I could be wrong but I thought that the FP was the older brother to the max.
I do know that o.s. is really good to change just enough to make parts hard to get, or at least that is the problem I have with mine.

Jeffery · Mar 30, 2009, 07:56 PM

The FP is a newer design by quite a bit, the pic I posted of the Max 15 was from 1975, the pic of the 15 FP was from 1987.

The OS time line is posted Here

MrGreenSpeed · Mar 30, 2009, 09:32 PM

The old os max 15 has a baffle piston while the FP15 is a Schneurle port engine.
+ a few more things.

Jeff

Mellowdave · Mar 30, 2009, 10:40 PM

I noticed also on the side opposite the OS 15, there is an "FP" marked in the casting.

Thanks for the links and the info guys! I can always count on RC Group forums for great information.

Mar 30, 2009, 02:41 PM	#1
Mellowdave Registered User United States, CA, Sacramento Joined Aug 2008 38 Posts	Question OS Max 15 and FP signify? I have an old engine I'm trying to sell. The box says OS Max 15 FP, but someone told me it's just an "OS Max 15". Is there a difference? What does FP mean.... sleeved bearing or something? Before the FP's came out did they have an OS Max 15 and how would I be able to tell the difference. I don't know to much about fuel engines so any information would be appreciated. Thanks!

Mar 30, 2009, 02:53 PM	#2
Jeffery And You're Not Timbuktu, Mali (Happy?) Joined Oct 2002 6,513 Posts	Here's a pic of each. Images View all Images in thread Views: 136 Max 15 Views: 148 15 FP

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Mar 30, 2009, 03:57 PM	#3
Mellowdave Registered User United States, CA, Sacramento Joined Aug 2008 38 Posts	Thanks for the pics. The only difference I can really see is that where the marking on the cylinder is on a raised area on the FP, and not on the other. I wonder what the differnce is internally? Is one engine better than the other? Would one be worth more than another? Thanks again.

Mar 30, 2009, 04:28 PM	#4
MerlinV Registered User Melbourne, Australia Joined Mar 2009 1,364 Posts	What are you asking for it Dave? Cheers, Hugh

Mar 30, 2009, 07:45 PM	#5
MOUNTAINROAD The Tree? Yea I can hit that! United States, UT, Provo Joined Jan 2009 185 Posts	I could be wrong but I thought that the FP was the older brother to the max. I do know that o.s. is really good to change just enough to make parts hard to get, or at least that is the problem I have with mine.

Mar 30, 2009, 07:56 PM	#6
Jeffery And You're Not Timbuktu, Mali (Happy?) Joined Oct 2002 6,513 Posts	The FP is a newer design by quite a bit, the pic I posted of the Max 15 was from 1975, the pic of the 15 FP was from 1987. The OS time line is posted Here

Mar 30, 2009, 09:32 PM	#7
MrGreenSpeed Registered User Joined Jan 2004 604 Posts	The old os max 15 has a baffle piston while the FP15 is a Schneurle port engine. + a few more things. Jeff

Mar 30, 2009, 10:40 PM	#8
Mellowdave Registered User United States, CA, Sacramento Joined Aug 2008 38 Posts	I noticed also on the side opposite the OS 15, there is an "FP" marked in the casting. Thanks for the links and the info guys! I can always count on RC Group forums for great information.