8000 rpm??

[idvette]

I watched a youtube video of "pyro"'s (on s n f) 'stream with a 2.4 running 8000 rpm. just wondering, since it's winter and i need a project anyways, what would it take for my 2.4 xri efi to run like that? is it even possible, or is his motor a completely different animal? love those revs.....

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[77viper]

If yours is a EFI there will be a rev limiter in the ecu, I don't know what it's set at but close to 6500. Even with the nitrous and a 26 pitch prop I can only get about 7700 rpm out of my 2.4, and that's with a light viper. The 2.4 doesn't breath as well as a 2.5 so it's limited on rpm before they run out of steam.

I see it's a bridgeport, that is a whole different animal than a fishing motor. To make a regular motor spin up a little better search for cherry 2.4 by T-rex.

[idvette]

I build car motors all the time, so I know what it takes to get them to rev. But 2 stroke modifying is new to me.... Can I just get a reprogrammed ecu and spin the wee out of it? Or is there airflow/ignition/injector upgrades or modifications that will be advantageous?

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[77viper]

Found it http://www.byuboyz.com/trex/Cherry2.4.htm

If your motor is stock first thing that needs to go is oil injection, next is reeds.

[idvette]

Wow, most of those are simple mods just to improve airflow. Besides cutting the heads, really, there's nothing I can't do out in my shed lol... Looks like I might have to bust open my "parts" powerhead and introduce it to my die grinder . Still limited by my ecu though, is there a factory one I should look for? Or a specific aftermarket one? Thanks for the link btw, I'll put it to good use I'm sure

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[idvette]

What's the difference between a bridgeport and my motor?

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[77viper]

The big difference is the exhaust port. The BP has a large port requiring a bridge in the middle hence the name bridge port. It was mercury's racing engine before the 260. If you can find a ecu from one it would be a step in the right direction, otherwise check with Brucato http://www.brucatosvs.com/acu.html

http://i93.photobucket.com/albums/l50/kartracer_01/img1251855750176.jpg

[idvette]

Cool stuff, thanks for the help. I'll be keeping my eyes open over the winter months for a few things now.... Jack plate, props, ecu, lol.... Can't wait to get it wet again!

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[transomstand]

The cast pistons can be a problem, 8000 is borderline for em.

[idvette]

That's fine with me, I'm just looking for more than what I have. Good to know there is a limiting factor though!

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