Rocky Mountain Monte Carlo

Designs for inboard or outboard power

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tysman52
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Re: Rocky Mountain Monte Carlo

Postby tysman52 » Tue Oct 17, 2017 2:06 pm

Can I get some engine and transmission advice? These are dumb questions but I don't want to screw up this engine purchase LOL. I am not an engine guy and I'm going out on a limb here ! I decided to go with the PCM 6.0 L. My rudder is placed about an inch to the port side. I have a star board Helm. Do I need a left or right Prop spin? I talked to Richard at discount inboard. The 1:1 transmission gives a left. The 1:23 is reverse and also has a down angle of @ 9 degrees which lets it sit more level. I don't think I necessarily need to do the angle transmission for my size standpoint but can't hurt?

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Bill Edmundson
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Re: Rocky Mountain Monte Carlo

Postby Bill Edmundson » Tue Oct 17, 2017 3:36 pm

As I remember, for a starboard helm you use a right hand prop rotation (clockwise looking from the rear). Gear wise, if you use a 1:1 then if it was 12" pitch, you will get the same results with 1.23:1 and a 15" pitch. If the 1.23 is a ZF63a, it can be set-up left or right.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
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jenko
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Re: Rocky Mountain Monte Carlo

Postby jenko » Tue Oct 17, 2017 4:18 pm

What I found with the 12''props was they start to loose performance around the 4000 rpm shaft speed (their slip decreases from 0 srpm to around 3000 srpm stays the same to around 4000 srpm and then slip starts to rapidly increase (I tested with 4 different gear ratios so hull speed is not a factor with these findings))so if the max rated rpm of the pcm is 5000rpm or better I would go with 1:1.23ratio which would allow you to use a 12'' to 14'' prop efficiently
Last edited by jenko on Wed Oct 18, 2017 2:53 pm, edited 1 time in total.

tysman52
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Re: Rocky Mountain Monte Carlo

Postby tysman52 » Wed Oct 18, 2017 12:24 pm

So I will plan on ordering the 1.23:1 right hand spin. Thx! JT

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Bill Edmundson
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Re: Rocky Mountain Monte Carlo

Postby Bill Edmundson » Wed Oct 18, 2017 2:06 pm

JT

I think the 4000 srpm is about blade tip cavitation. The larger the prop the lower the srpm. A 14 inch prop should be affected at 12/14 x 4000 srmp. These are just rough numbers.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

tysman52
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Joined: Thu Oct 18, 2012 1:17 pm
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Re: Rocky Mountain Monte Carlo

Postby tysman52 » Mon Nov 20, 2017 3:12 pm

What did you all use for decking plywood?
The plans call for exterior A/B douglas fir...Worth the expense for mahogany plywood? I can only get 1/4 or 3/4 marine, so I would need to track down some 3/8 if I go with the mahogany ply.

tysman52
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Re: Rocky Mountain Monte Carlo

Postby tysman52 » Sat Nov 25, 2017 9:27 pm

Engine supposed to arrive next week. To keep myself busy, have been working on seats...
JT
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tysman52
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Re: Rocky Mountain Monte Carlo

Postby tysman52 » Sat Nov 25, 2017 9:33 pm

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tysman52
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Re: Rocky Mountain Monte Carlo

Postby tysman52 » Sat Nov 25, 2017 9:42 pm

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Plan to do two pivoting captains chairs for driver and shotgun, Going to combine front two cockpits into one with U shape seating behind two pivoting captain chairs. I have small kids so this layout seems a bit more conducive to little ones...opposed to constant jumping between the front two...

I made a template with poster board. Then played with the angles and shape. Made cuts through marine hydrotek mahogany ply... about 75% through the ply. Then carefully clamped and bent around the 3/4" seat. Once in place, I epoxied the cuts to help hold the shape and regain it's strength. Then plan to upholster the inside and stain/varnish outside.
Got it all cut out and fit then removed it all and put it in a pile for when I get all of the mechanicals in...
JT

tysman52
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Re: Rocky Mountain Monte Carlo

Postby tysman52 » Sat Nov 25, 2017 10:00 pm

Plan to have all of the upholstered panels to be easily removable for easy access as needed
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mrintense
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Re: Rocky Mountain Monte Carlo

Postby mrintense » Sun Nov 26, 2017 9:31 am

Love the work on the seats. I've seen this slice and bend technique used to good advantage on other projects. I think that those curved seats are going to look beautiful once upholstered.
Carl
a.k.a. Clipper

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Milhouse
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Re: Rocky Mountain Monte Carlo

Postby Milhouse » Mon Nov 27, 2017 1:05 pm

Love the curved seats!
Jim
16' Ski Boat Restoration
17' Overnighter Sloop

I'd rather have a $h!tty meal than an $h!tty resume because a totally awesome resume will feed me steak one day - Steve Poltz

tysman52
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Re: Rocky Mountain Monte Carlo

Postby tysman52 » Fri Dec 01, 2017 9:32 pm

Got her on the trailer to take down to the trailer guys to do final fitting. Glad I had the boat lift to do the heavy lifting! Not sure how I would have done it otherwise. Strapped it down and had a puckering drive down the freeway hoping to keep it on the trailer. Got a few thumbs up from drivers on the freeway and no catastrophies. Picked up the engine from the terminal on the way back. Big day!
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tysman52
Posts: 51
Joined: Thu Oct 18, 2012 1:17 pm
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Re: Rocky Mountain Monte Carlo

Postby tysman52 » Fri Dec 01, 2017 9:35 pm

PCM ZR4 6.0 L (409 hp) with 1,23:1 PCM tranny with 9 degree down angle. Planning to use the lift to lower it in. Hope it all fits
JT
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JimmY
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Re: Rocky Mountain Monte Carlo

Postby JimmY » Sat Dec 02, 2017 6:34 am

Glad you got there in one piece, that's a lot of boat to move!
-Jim
Nothing says poor craftsmanship like wrinkles in your duct tape!


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