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Modifying the RCMK ... Now up

Old 04-27-2009, 03:34 PM
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Scott Schneider
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Default Modifying the RCMK ... Now up

MGB has posted the latest "How Too" ..... Modifying the RCMK S254 and R254 cylinders

See: [link]http://www.modelgasboats.com/Magazine_Content/Tech_Articles/RCMK_Engine_Modification/[/link]
Old 04-27-2009, 03:45 PM
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Dreamin Hemi
 
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Default RE: Modifying the RCMK ... Now up

Nice article! Was just a matter of time I suppose. Projected HP output?
Old 04-27-2009, 06:09 PM
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Scott Schneider
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Default RE: Modifying the RCMK ... Now up


ORIGINAL: Dreamin Hemi

Nice article! Was just a matter of time I suppose. Projected HP output?
Not a dyno guy myself ... my test bed is within known set-up hulls.

That said, the modified S-254's are running like Zenoah eaters making more power across the rpm range than the best of my Zenoahs ever had.
RPM is mid 18K's without breaking a sweat while having a nice spread of power threw out the rpm range.

Hp projections relative too known engines with dyno specs .... 6+HP is not a stretch IMO and likely conservative.
Old 04-27-2009, 06:14 PM
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Default RE: Modifying the RCMK ... Now up

WOW! Just curious, what prop are you running with these motors? Are you running the same one after modifications?
Old 04-27-2009, 06:29 PM
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twindaddy66
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Default RE: Modifying the RCMK ... Now up

Well, I can see now what is going in my next boat...

T-Daddy
Old 04-27-2009, 10:32 PM
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Ron Olson
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Default RE: Modifying the RCMK ... Now up

I'm waiting for this weekend as a certain engine modder is going to be at the Flint records trials and am curious to see if he brings a tweaked RCMK with him. I'll have shots if he does.
Old 04-27-2009, 10:37 PM
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Scott Schneider
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Default RE: Modifying the RCMK ... Now up

We were out for 2 3 hours sunday ONLY running the RCMK powered rigger ... Under mod zenoah power it did best with 2716-20* or 3014 cupped up running 16,800 to 17,200 , any more prop than that engine just sagged away up top.
The modified RCMK in the same boat, Same pipe & length .. JUST a motor swap spun the 2716 & 3014 effortlessly at @ 18,300 to 18,600, it would pull a 2818 & 3016 cupped up darn near as well tho a tad slow getting up on step. So ... Yea, it does have more power every where, quite frankly it is a freekin animal !!

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