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OS .25FP??

Old 04-03-2012, 05:57 AM
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klord125
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Default OS .25FP??

I've read on here that you can put a FP.40 carb on the .25. How much does that improve performance? The FP series I'm told is a good sport engine not so much performance?
Old 04-03-2012, 07:38 AM
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vertical grimmace
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Default RE: OS .25FP??

You can install the .40 size throttle barrel in the .25 FP carb. Also add that one piece black muffler from Macs, and run a 9-4 APC or MAS prop. This was the sweet setup on the early scale combat models. This will add around 1,000 rpm
Old 04-03-2012, 08:21 AM
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Default RE: OS .25FP??

I use the .40 FP throttle barrel in my .20 FP and it is a strong runner with good fuel draw.
Old 04-03-2012, 08:43 AM
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klord125
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Default RE: OS .25FP??

What kind of rpm's are you seeing?? And on what % nitro? Thanks Ken
Old 04-03-2012, 09:14 AM
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Default RE: OS .25FP??

16,900 on 10% Omega with muffler pressure. My engine is the older version with the iron piston and steel liner.
Old 04-03-2012, 03:22 PM
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Default RE: OS .25FP??

This setup will get you over 16,000 rpm. It is a great mod. The venturi size in the stock carb is really small. You can even drill out the stock barrel if careful. Another mod is to set the back nut on the high speed needle to move the spray bar back out of the venturi. May get you up to 17,000. Fun engine to play with. Lots of potential. I think there were some posts on the RCCA website describing all these mods. A mouse can muffler might even help you more. Not sure at what point they redline though. All engines seem to have a point where they let go. The FP was not designed to rev up super high.
What is this application for?
Old 04-03-2012, 04:02 PM
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lfinney
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Default RE: OS .25FP??

they hold together quite nicely at 18-19 k, i have run them with the macs wizard mini pipe seem to run fine at ten gallons no ugly black metallic discharge...
Old 04-03-2012, 04:04 PM
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lfinney
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Default RE: OS .25FP??

they hold together quite nicely at 18-19 k, i have run them with the macs wizard mini pipe seem to run fine at ten gallons no ugly black metallic discharge...
Old 04-04-2012, 06:35 AM
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Yuu
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Default RE: OS .25FP??

The only bad thing is that I can't find a stock needle anymore. All sold out. I guess the .25 LA uses a plastic carb... so where do I find another needle for the .25 FP? My student is kind of tough onmy equipment.... AND... is this the .40 LA carb you're talking about?
Old 04-04-2012, 09:23 AM
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klord125
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Default RE: OS .25FP??

Looking to put it on a Sig Cobra. It calls for a .19-.25. I have a new FP25 and a FP40. Can't put the 40 on it.
Old 04-04-2012, 11:07 AM
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lfinney
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Default RE: OS .25FP??

ebay should find you a needle assembly 20-40 fp are the same
Old 04-04-2012, 08:45 PM
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Default RE: OS .25FP??

why cant you put the 40 on it? I have a kobra and plan to put a GP42 on it with mods and a Jett muffler. 17,000 with a 9x8. and its only 9 ounces.
Old 04-04-2012, 11:57 PM
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Default RE: OS .25FP??

9 ounces?
Old 04-05-2012, 01:29 AM
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Default RE: OS .25FP??

The engine
Old 04-05-2012, 05:56 AM
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klord125
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Default RE: OS .25FP??

My buddy put the FX .25 in his this week. Its really tight and was pretty nose heavy. Theres not alot of room to move battery and receiver around. Also the servos are set back pretty far. But the engine compartment is really tight with a .25 not mention the additional weight of a .40.

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