As I was deciding what to do with my xk19, a 350QA was offered to me

As I was deciding what to do with my xk19, a 350QA was offered to me

Joined: October 15th, 2007, 8:14 am

November 24th, 2017, 6:06 pm #1

Hello Friends,
I could put my hands on a 350QA,I know it's not the original engine but it's a close choice.
Would you consider it acceptable?
Have a nice day,
Marco
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Paul
Paul

November 24th, 2017, 10:20 pm #2

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Joined: October 15th, 2007, 8:14 am

November 25th, 2017, 9:38 am #3

The seller, is asking a trans company if it's possible to change internals to to correct ratio...
Have a good weekend everyone!
Marco
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Paul
Paul

November 25th, 2017, 10:04 pm #4

The motor that has a v-drive attached is a complete package and you would not be out there looking for a bell housing or something nobody had, therefore the complete motor and transmission is the way to go. There are three big pieces to this system: the motor, the transmission, and the v-drive. If the transmission part of the v-drive is the wrong ratio it may be less expensive to remove it and simply search out the proper transmission and insert it into the package. The last time I checked on trying to change a ratio in a Paragon it was less expensive to just buy a complete rebuilt Borg Warner and that's what I ended up doing.

The other issue is, if you need a 1:1 ratio and the transmission is a 1.5:1, it may be possible to compensate with a higher pitch propeller, but that can get expensive too if it has to be a custom job.

Taking 4000 RPM as a baseline (in theory) with a direct drive and 15" pitch you obtain 56.8 mph (minus 20% slippage/drag) = 45.5 mph

At 1.5:1 reduction at the same rpm (in theory) you obtain 37.8 mph (minus 20% slippage/drag) = 30 mph.

Therefore, if you happen to have the 1.5 reduction, using a 23" prop (in theory) at the same 4000 rpm would provide a speed of 58 mph (minus the 20% slippage/drag+ = 46 mph


The 20% drag factor should be about right for the v-drive and deep vee hull, but at least I used the same factor for each example. This assumes the motor will have enough power to spin a prop to 4000 rpm too.

So at this point I'm guessing and just like to play around with the math a bit. If you have a 2.0 or 2.5 reduction then that obviously will not work.

Chad and Craig L will undoubtely have some comments on the ratio as well. Give us some more details. This assumes of course, you are going to convert the boat back to an original v-drive system. That, my friend, is going to be a lot of work but of course it CAN be done. You will need a shaft strut at the proper angle to do this, and then will have to bore the hole for the shaft, and will need to install a protrusion in the hull to accept the shaft log.

In the end you will have an original power v-drive boat. The power ratingon the motor may be down from the original specification but if it needs any work at all, it would be quite easy to bump that up. I am not a big fan of the Q motors, they provide good power and they are well engineered, but I would be tempted to convert the motor to an F cofiguration and install a high performance intake manifold like the Edelbrock Performer RPM,

As you can see, once you start getting into all of those issues, the project starts getting more complicated and the cost starts creeping up fast.



regards,
Paul
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Joined: October 15th, 2007, 8:14 am

November 26th, 2017, 1:23 pm #5

Thanks to Jim at Fine Wood boats I already found strut, rudder, steering column with worm gear.
In the meantime I'm checking with our mechanic the work involved with such a modification and guess what? He had a Cc complete but threw it away a couple of years ago because nobody wanted it and he needed space...
The engine I found is in need of a rebuild and I contacted CD's Engine but they didn't reply yet.
Can you suggest an alternative rebuilder?
In the meantime thanks a lot for all your support!
Have a nice weekend.
Marco
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Joined: October 15th, 2007, 8:14 am

December 5th, 2017, 7:48 pm #6

Today I spoke with an "inspection consultant", a guy who helps people navigate through the endless list of rules and laws that we have in Italy and he told me that it's almost impossible to install an import engine and have it certified, the whole boat must be certified and it has to be 100% CE complaint.
More so since we have introduced CE laws and certifications...
If I want to install a CC engine I have to find it in Italy with italian docs. I think it's impossible.
Tonight I contacted a guy who's a Riva spares specialist and sometimes deals with Chris Craft parts but I'm not very positive. Though it's my only option at the moment.

I'm currently working on my OMC to refurbish the old sterndrive unit.
I'll keep you posted.

Have a nice day everybody.

Marco
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Joined: October 25th, 2017, 9:27 am

December 6th, 2017, 10:33 am #7

Hi Marco,
You cant be serious if you mean that you have to CE-certify your classic XK-19 from 1970???
The CE-rules are just for boats build and produced after 1998!
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Joined: October 15th, 2007, 8:14 am

December 6th, 2017, 1:15 pm #8

Without engine documents I could certify the boat as a one-off but, since it counts as a new certification, respecting CE rules.

In Italy it works like this:

Unregistered boats (up to 10 meters) do not have any document but must have a "declaration of engine horsepower", this doc accompanies the engine wherever you install it.
Without it is like the the boat simply doesn't exist, I know it's a stupid law.
I can change the engine without any problem with a +15% tolerance in horsepower.

I have my OMC declaration of horsepower and the document that says the boat has been cancelled from the registry in 1994 (until the mid-eighties any boat with 40HP or more had to be registered with a plate).
During the late eighties a new law appeared and boats up to 7.5m could be considered "small vessels" and no plate was needed. Many people decided to cancel their boats from the registry for tax reason an thus those boats became "natante" (literally "floating") not subject to property tax, selling fees and so on...
Later on 7.5m became 10m and many other boats were cancelled.

So my boat is a "natante" and it needs engine documents.
Since Chris Craft and Chris Craft Italy went out of business I cannot ask for a copy (that would be valid to Italian law) of the "dichiarazione di potenza".
I already asked Chris Craft but they do not have any old document or certification...

So I was told from different consultants...

Have a nice day everybody.

Marco
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Joined: October 25th, 2017, 9:27 am

December 6th, 2017, 5:24 pm #9

Wow!...that is stupid!
Never heard of that situation here in Sweden...maybe i don't know how bad it is here yet!
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Paul
Paul

December 7th, 2017, 12:11 am #10

It can easily be demonstrated that you are installing the "original" motor type and power. It would be the same as if you found one down the street, as there are undoubtedly some there somewhere in the country due to the fact that these boats populated the area and needed work, had motors removed, repaired, rebuilt, etc.

Your boat can be documented to have received a certain power rating. I am quite sure I can demonstrate with original documents from Italy that your boat received a particular type of power in original form. Let me know what you are wanting to do. I can send you a letter, photocopies, etc. and it might help but it depends on how head-strong the local officials are and how they view restoration of vintage boats.

regards,
Paul
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