Hi Guys
Thinking about raising my X dimension 2 and a half inches while i am doing some transom work. I look at it as a easy speed gain no brainer but now I am concerned about cooling problems .
My current X measures 7.75 from the propshat to the bottom which I believe is stock height.
I like the idea of raising because of all the positive things I have read on here about the handling improving and speed gain isn't bad either
The boat is not a Donzi but I posted here in the Donzi talk to get the expert advice knowing most you guys probably don't look in the talk other boats thread, so I apologize for intruding.
Anyways the boat is a 19 foot 1978 Baron which my older brother designed and built a few before shutting the doors and eventually selling his molds to powerplay/Powerquest to become their 185xlt.
Anyways the bottom is a rounded V very similar to the Donzi 18 with no hook and just a little rocker so it does not need any positive trim.
I have a Brand new Gen2 Alpha and transom assembly that I am going to mount on the boat that has not been in the water for 20 years and thought if I am going to the trouble why not raise it.
Concern is I live in SW Florida where our water temps can get into the high 80s if I will be sucking some air and have cooling problems.
After reading the poor handeling issues experienced by people putting on lower water pickup nosecones I will not be doing that.
One motor I have for it is a brand new Mercruiser 305 220Hp 2 barrel that I had bought for another project .
My original motor is a 1978 260 bored 30 over with a pretty hot cam built by a reputable marine builder here in Naples 20 years ago with 202 intakes and a little stock head porting with a rejetted Quaddrajet on the stock intake. I also have a new set of Elbow top CMI headers on this motor too.
The boats ran 58 on radar back in the day with the 260hp .
I think the 355 i have built may be worth 320hp with the Exhaust so maybe 65mph with the stock x height and maybe 70 with it raised.
I am leaning towards putting the 305 in just for the low key quiet Y pipe running for a while .The 355 motor is in the boat but I have never ran it other than on the hose and I would want to rerig it before I ran it at this point.
Anyways My thought was raise the X 2 1/2 inches because that is all the further I can go if I ever want to run the 355 with the headers or they start to exit thru the rubrail without getting new tailpipes made.
If I ran the stock 305 with the Vortec heads with just a little more cam and a 4 barrel going thru the Y-pipe and a raised X I was hoping for maybe 58 to 63.
Raised X is good for at least 5 mph right?
Sorry for rambling just wanted to relay all the info I have to you guys because I have some other ? too later on.
I have been doing searches and pouring over the threads for hours gathering info ,just looking for the latest news.
By the way if this wasn't one of my brothers design I would be in a 18 Donzi, still the hottest looking boat out there.
Thanks