Imco Lowers
 

Has anyone run Imco 2" shorties on a 31 SS ?? What were the results?

we have tested with them... not so good results, save the $$$

Ok, bravo 1's wont take the HP of IMCO so what would you suggest?

How much hp are you running? The shorties caused way too much cavitation... If you are asking in regards to a stronger drive, we run a set of built drives that have been cryo'd, polished, ect. to hold up for 700hp each... so far, we have only had one failure but with it being a heavy boat and boating on lake michigan where it tends to get rough...

:ernaehrung004:

thats good to know, I'm at 580 HP for now. Doing 540 bottom ends soon.

So you are saying raising the X on a Sonic will not help it any?
I guess that is what I was looking for.

Thanks for the info.

On the early 90's boats maybe a little but it will have to be both the lowers and some prop work. On the newer hulls, not worth it IMO. The cost-to-MPH ratio is high...meaning for the additional cost, the speed gain is minimal IE 2-3mph.

anyone ever run extension boxes on a Sonic?.....straight vee's usually respond well to them....

Lots of 38's were built with them.

Mine came from sonic with a extension box.Night and day difference with it.Well worth every penny...

my 358 came from factory with boxes.......runs great but never ran without them so I can't compare.......

Have a good friend that had a 42 with them. Didnt like them he said. He had another 42 without them and said he liked the non box 42 much better.

There are a few 45's with them also. Mine isnt one of them.

what was your propshaft height on your boat? with and without shorties. I know a few boats that spaced theres 1'' and picked up better handling and speed, in rough water they seem to make the boats fly more level. my friends 31 sutphen single went from 90 to 94. his propshaft is 3 3/8'' below the keel which is short. my two boats are now 3'' and 5''. going testing next week with the saber 28. its height was 7 1/2'' would only run 65 with hp500,then old owner put a 2'' shortie pick up 3mph to 68. I'll post what the konrad ace will do. its close to a imco in looks.