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View Full Version : Question for all ya OMC guru's


JTS Racing
10-08-2001, 01:18 PM
What would be considered the maxed out rpm for a OMC looper V6,,,,drag class?? Would this best be obtained with a finger ported or behind the liner engine?? On gas with NOS and alky chaser or with an alky/nitro blend?? Looking to be able to turn in the neighborhood of around 9500 with a .9-1 SSM and a 11X20 prop. I've already run the set up with a mainly stock, (light flywheel, 195#'s compression, 6 2-barrel carbs on Alky and only blending work inside), at +-8000. Jus need the extra 1500 and do it in around 1000'.

What are the options.....other than black.....for now???;)
Ray Neudecker
10-08-2001, 02:31 PM
The first fingerported OMC I ever ran turned 1000 rpms more on a 20 ft Allison bass boat with no other changes except bigger jets. The behind the liner motors flow more and produce more torque than the fingerported ones. As close as I can get to answering your question. As far as maximum rpms, the most I have turned one is 9500. i would assume a lighter boat and speedmaster would produce as least as gooda result. These motors were run on race fuel only.
JTS Racing
10-08-2001, 02:52 PM
Well, you saw how this thing did on just Alky, and that engine wasn't anything special. Although I have added a little weight, I also lost some in other areas, so I havn't a clue were to even guess were its at. The wife and I can flip it as easy now as when I first started on it, and she still makes me do the front.....lol. Gonna try and take it to Jasper this weekend to scale it and see jus were I ended up. I'm trying for the 1050#'s in unlimited, but if I end up close to 1200 or so, I'm going with NOS.

See you in Jasper.
Ray Neudecker
10-08-2001, 05:12 PM
Good to hear you can float again. We will have three or four boats there. look forward to seeing you there.
racer
10-08-2001, 09:29 PM
Hydro,

A looper will turn 9500 in a quarter if built correct, but it will need good maintanence to do so. On my dyno a finger ported version will make as much peak power but as Ray said a behind the liner motor will make a little more torque, but also more time consuming to build