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-   -   Imco -2 lower question (https://www.offshoreonly.com/forums/drives-lower-units/387190-imco-2-lower-question.html)

tripps 01-07-2026 05:47 PM

Imco -2 lower question
 
How manny rpm would you pick up wen u put on a -2 lower on a single 30 V bottom with a pad 6500 lb boat 502 500hp 1.5 gear ratio bravo 4 blade prop lower is about 4 inches below pad now. TIA

Griff 01-07-2026 08:43 PM

My guess is you won't even be able to get on plane with a -2 lower and Bravo prop.

tripps 01-08-2026 02:43 PM

Lower
 
It has a bravo now plane s off without even touching tabs!!!!

F-2 Speedy 01-08-2026 03:15 PM

what rpm are you turning now ? current prop pitch

tripps 01-08-2026 08:39 PM

Imco
 
5800 24 bravo I know I need more prop

F-2 Speedy 01-08-2026 08:53 PM

Im surprised its still together..............id get the revs down around 5200 5300.........maybe a 28-30 pitch, then address the drive issue

Griff 01-08-2026 10:34 PM


Originally Posted by tripps (Post 4941138)
It has a bravo now plane s off without even touching tabs!!!!

Going from 4" below the bottom to 2" below is a huge change. Most single engine V's are set up in the 3-5" below range.

SecondWind 01-09-2026 05:13 AM


Originally Posted by Griff (Post 4941155)
Going from 4" below the bottom to 2" below is a huge change. Most single engine V's are set up in the 3-5" below range.

I agree with Griff. You can install an IMCO SC -2 lower but you'll probably end up with a 1-1.5 inch spacer. I do like the IMCO SC lowers though, very little drag.

tripps 01-10-2026 01:08 PM

Imco
 
Thanks guys ill let u know how it worked in June!!!!

boostbros 01-10-2026 04:59 PM

i put a 2 inch shorter sportmaster on our 25 foot thunder and lost the fun of overtrimming and winding it to the moon nothing sounds like a na bigblock wound up to 7000rpm it still slides on plane with no effort, it was more fun with it deep


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