Lower Units

[crxski]

Hey guys,

Just stumble upon this site while looking for merc parts. I don't have a race boat but I have a 11.4" 2 deg flat bottom runabout my dad and I built 10 years ago and I'm looking to get it up and running again.

I'm using a stock 1979 merc short shaft 2 cylinder 40hp, not the 400 this one should be a 401. I do have an extra older 40hp motor as well, got it for parts.

Anyways I was told there was quickie lower unit made for the merc 35hp, just wondering if this is true?

IF so or if not, I would like to get something like it, or make something work that would improve the top speed. I don't care about acceleration just top speed.

The motor has not been on the boat yet, so I'm not sure what it will do stock with the prop I have. The 25 short shaft I had on it did 43mph on the wisho meter. I'm hoping to hit 50 with two people would be nice and high 50s with one.

Not sure if the mph is realistic but I do like to dream. I'm sure it will do 50 with the extra power.

The prop I have is a quicksilver 17p forget the dia of it. Its off a C class tunnel that had a 40hp merc on it. Its a chopper as well. I would like to have it tuned up after I get the motor setup of course.

This is a project I would like to get ready for next year, looking to get info and parts this year.

Hope someone can help

Cheers
Mike
Kingston Ontario

[sam]

There was a 2 cylinder 35ss/402x model with a Quickie, but it also had a special mid section to mate them.

There is no Quickie for the regular 2 cylinder 35 or 40

Quickies do not carry weight well. A larger heavier boat like yours usually does not benefit from a racing lower unit.

50 mph with that style boat and 40 hp is not very likely; you are probably topped out

[crxski]

There was a 2 cylinder 35ss/402x model with a Quickie, but it also had a special mid section to mate them.

There is no Quickie for the regular 2 cylinder 35 or 40

Quickies do not carry weight well. A larger heavier boat like yours usually does not benefit from a racing lower unit.

50 mph with that style boat and 40 hp is not very likely; you are probably topped out

Ok I'm guessing these are very rare as well since I've never seen one.

Kinda disagree with the quickie lower not benefiting my boat as it has very little drag vs the stock unit. I normally run in 6"+ chop not ripples as the hull needs to be aired out more. The same boat but a lighter version ran low 50s with a mark30 like 30+ years ago on my lake.

You really think adding 15hp and more torque will not gain me 7mph?

edit, basically adding 40% more hp

[sam]

I think the 50+ mph with a 30 is BS unless you are talking about a 30H on a fully stripped racer

Total rig weight will be more critical than your opinion of how easily your boat skims along the water. 500 pounds is about the limit for a quickie.

Racing runabouts for 50 mph generally weigh less than 150

That's why I think it will not work. You will never get into the usable weigth range or usable power to weigth range with the stuff you have

[crxski]

I think the 50+ mph with a 30 is BS.

Total rig weight will be more critical than your opinion of how easily your boat skims along the water. 500 pounds is about the limit for a quickie.

Racing runabouts for 50 mph generally weigh less than 150

So mines about 205lbs + engine and fuel

And its a 40hp not 30hp and I'm basing speed of the speedo which is normally off by a far bit as I didn't have a gps last time the boat ran.

What is this "limit" you speak of? A physical limit, meaning the mid shaft can not handle the weight?

[sam]

Yes, there is a physical limit set by the maximum prop diameter you can put on a Quickie.

I think your weight estimate is very far off.

[sam]

Oops

Did not understand your weight comment. Thought that was total weight

I think the motor is 155
Gas tank and gas about 55

That's 400+
now add yourself

You are at or over without a passenger

[Andrew 4CE]

Mike, I see you are in Kingston... we're racing just north of Napanee at Erinsville on July 16-17... why not come out and see one of the quickies in person people are talking about. And enjoy watching some racing while you are at it.

Andrew

[jeff55v]

Anyways I was told there was quickie lower unit made for the merc 35hp, just wondering if this is true?

IF so or if not, I would like to get something like it, or make something work that would improve the top speed. I don't care about acceleration just top speed.

Cheers
Mike
Kingston Ontario

Mike, Bass Machines has an ad on the front page of this site. Give them a call. I'm sure they can machine an adapter to put your powerhead onto one of their new midsection / lower units. They do top notch work.

[sam]

That will not fix his power to weight to prop diameter

He would still be dealing with the prop too small for his load

[cottagecreep]

Mike, I see you are in Kingston... we're racing just north of Napanee at Erinsville on July 16-17... why not come out and see one of the quickies in person people are talking about. And enjoy watching some racing while you are at it.

Andrew

Boom! Great event, we can get you set up, there are guys with decades of experiences rigging crazy stuff, someone will help you out without a doubt. Besides that, the races are awesome!

[trident]

402x

Hey guys,

Just stumble upon this site while looking for merc parts. I don't have a race boat but I have a 11.4" 2 deg flat bottom runabout my dad and I built 10 years ago and I'm looking to get it up and running again.

I'm using a stock 1979 merc short shaft 2 cylinder 40hp, not the 400 this one should be a 401. I do have an extra older 40hp motor as well, got it for parts.

Anyways I was told there was quickie lower unit made for the merc 35hp, just wondering if this is true?

IF so or if not, I would like to get something like it, or make something work that would improve the top speed. I don't care about acceleration just top speed.


The motor has not been on the boat yet, so I'm not sure what it will do stock with the prop I have. The 25 short shaft I had on it did 43mph on the wisho meter. I'm hoping to hit 50 with two people would be nice and high 50s with one.

Not sure if the mph is realistic but I do like to dream. I'm sure it will do 50 with the extra power.

The prop I have is a quicksilver 17p forget the dia of it. Its off a C class tunnel that had a 40hp merc on it. Its a chopper as well. I would like to have it tuned up after I get the motor setup of course.

This is a project I would like to get ready for next year, looking to get info and parts this year.

Hope someone can help

Cheers
Mike
Kingston Ontario

Mike, please see PM.

Jerry Wienandt

[johnsonm50]

Hey guys,

Just stumble upon this site while looking for merc parts. I don't have a race boat but I have a 11.4" 2 deg flat bottom runabout my dad and I built 10 years ago and I'm looking to get it up and running again.

I'm using a stock 1979 merc short shaft 2 cylinder 40hp, not the 400 this one should be a 401. I do have an extra older 40hp motor as well, got it for parts.

Anyways I was told there was quickie lower unit made for the merc 35hp, just wondering if this is true?

IF so or if not, I would like to get something like it, or make something work that would improve the top speed. I don't care about acceleration just top speed.

The motor has not been on the boat yet, so I'm not sure what it will do stock with the prop I have. The 25 short shaft I had on it did 43mph on the wisho meter. I'm hoping to hit 50 with two people would be nice and high 50s with one.

Not sure if the mph is realistic but I do like to dream. I'm sure it will do 50 with the extra power.

The prop I have is a quicksilver 17p forget the dia of it. Its off a C class tunnel that had a 40hp merc on it. Its a chopper as well. I would like to have it tuned up after I get the motor setup of course.

This is a project I would like to get ready for next year, looking to get info and parts this year.

Hope someone can help

Cheers
Mike
Kingston Ontario

If you were talking a stock aluminum fishing prop Id think there's a few ways to improve. Get a better prop, raise the motor all you can & experiment with tilt. Lighten the load & check its distribution if possible. Make sure the hull is not hook-d or rocker-d & is in good overall shape. Then get a race lower if not satisfied. At that point you'll be spending some cash & it could be alot & might net little since you already have a good speed prop on now. A Bass lower can handle the load, is available with a pump there's a wild array of props that fit. It could be faster but there's limits that are not easy to overcome.

[Larry M]

So mines about 205lbs + engine and fuel

And its a 40hp not 30hp and I'm basing speed of the speedo which is normally off by a far bit as I didn't have a gps last time the boat ran.

What is this "limit" you speak of? A physical limit, meaning the mid shaft can not handle the weight?

I have a 13 1/2 foot FeatherCraft pleasure boat that I put a stock 44 CI Merc on it with open pipes. I have the Mercury D quickie under it and it runs and handles fine. I never have tested much with props but it will run 50 mph on the gps. I never have weighted the boat but I would think it would be around the 500lbs range with motor and driver.

Larry Mac

[johnsonm50]

Theres a good comparison, A 44xs with pipes would push a race boat made for the class in the 80s while on the heavier conventional bottom boat it works but at some loss of potential speed. The same 44 on a fishing lower would be hard pressed to deliver 50 but 40s on the same Feather Craft. Race gear cases are designed to run near the surface, spin a smaller dia prop than the same power heads fish unit & meant to run in fairly undisturbed water [no keel or V,] -flat, tunnel or hydro type hulls.. at light weight. are what works. I don't know what effect the 2 degree V will have but suspect you would find it speeds up as you turn slightly to ride flat on one side if the V. If so that will be a measure of the excess drag a straight line has. To overcome this you would have to be riding high.