Home |
Search |
Today's Posts |
|
#1
posted to rec.boats
|
|||
|
|||
Need help with OMC 50 hp 2 cyl to 60 HP conversion
To make a long story short, my 1985 Evinrude 50 (2cyl) with a jet foot
attached just isn't quite enough to plane out 2 people at my 5000 ft+ altitude. So, lacking the funds for a new motor, I am converting it to the 60 hp version, or at least attempting to. I understand this will shorten the life of the motor and reduce the reliability, but not being able to plane out is no fun either. I have obtained 60 hp carbs and intake and was just about to install them when I heard the exhaust may also need to be modified. I can still obtain the exhaust parts if I need them but don't want to go through the extra expense and hassle if I don't. Does anyone out there know for sure if the exhaust differs between the 50 and 60 hp versions of this motor and if so, what parts do I really need? Your help would really be appreciated. Thanks, Mike |
#2
posted to rec.boats
|
|||
|
|||
Need help with OMC 50 hp 2 cyl to 60 HP conversion
mlvosk wrote:
To make a long story short, my 1985 Evinrude 50 (2cyl) with a jet foot attached just isn't quite enough to plane out 2 people at my 5000 ft+ altitude. So, lacking the funds for a new motor, I am converting it to the 60 hp version, or at least attempting to. I understand this will shorten the life of the motor and reduce the reliability, but not being able to plane out is no fun either. I have obtained 60 hp carbs and intake and was just about to install them when I heard the exhaust may also need to be modified. I can still obtain the exhaust parts if I need them but don't want to go through the extra expense and hassle if I don't. Does anyone out there know for sure if the exhaust differs between the 50 and 60 hp versions of this motor and if so, what parts do I really need? Your help would really be appreciated. Thanks, Mike Is this the 35 Jet 2 cylinder looper? Rob |
#3
posted to rec.boats
|
|||
|
|||
Need help with OMC 50 hp 2 cyl to 60 HP conversion
trainfan1 wrote:
mlvosk wrote: To make a long story short, my 1985 Evinrude 50 (2cyl) with a jet foot attached just isn't quite enough to plane out 2 people at my 5000 ft+ altitude. So, lacking the funds for a new motor, I am converting it to the 60 hp version, or at least attempting to. I understand this will shorten the life of the motor and reduce the reliability, but not being able to plane out is no fun either. I have obtained 60 hp carbs and intake and was just about to install them when I heard the exhaust may also need to be modified. I can still obtain the exhaust parts if I need them but don't want to go through the extra expense and hassle if I don't. Does anyone out there know for sure if the exhaust differs between the 50 and 60 hp versions of this motor and if so, what parts do I really need? Your help would really be appreciated. Thanks, Mike Is this the 35 Jet 2 cylinder looper? Rob Oh, you said '85. 35 Jet wasn't available yet from the factory. You will need to get the parts diagrams & lists to compare the mid-section exhaust tuner part numbers. By '85, (since the 1976 55 hp) the 2 cylinder loopers(40-45-50-55-60) shared the 45 CID displacement. I think the de-tuning was done at the carb throat size. Do you need the jet? Going back to a gearcase will give you more push and allow you to easily change props to get the rpm range where it should be. Rob |
#4
posted to rec.boats
|
|||
|
|||
Need help with OMC 50 hp 2 cyl to 60 HP conversion
Thanks for the advice, I found a catalog on line at: http://epc.brp.com/ According to this, the exhaust parts are the same, looks like I lucked out. Thanks again for taking the time to respond. |
#5
posted to rec.boats
|
|||
|
|||
Need help with OMC 50 hp 2 cyl to 60 HP conversion
Rob, it is the 2 cyl 50 hp looper with a jet foot attached (giving 35
at the jet or more like 28 at my altitude). MV |
#6
posted to rec.boats
|
|||
|
|||
Need help with OMC 50 hp 2 cyl to 60 HP conversion
mlvosk wrote:
To make a long story short, my 1985 Evinrude 50 (2cyl) with a jet foot attached just isn't quite enough to plane out 2 people at my 5000 ft+ altitude. So, lacking the funds for a new motor, I am converting it to the 60 hp version, or at least attempting to. I understand this will shorten the life of the motor and reduce the reliability, but not being able to plane out is no fun either. I have obtained 60 hp carbs and intake and was just about to install them when I heard the exhaust may also need to be modified. I can still obtain the exhaust parts if I need them but don't want to go through the extra expense and hassle if I don't. Does anyone out there know for sure if the exhaust differs between the 50 and 60 hp versions of this motor and if so, what parts do I really need? Your help would really be appreciated. Thanks, Mike You will need to get the parts diagrams & lists to compare the mid-section exhaust tuner part numbers. By '85, (since the 1976 55 hp) the 2 cylinder loopers(40-45-50-55-60) shared the 45 CID displacement. I think the de-tuning was done at the carb throat size. Do you need the jet? Going back to a gearcase will give you more push and allow you to easily change props to get the rpm range where it should be. Rob |
#7
posted to rec.boats
|
|||
|
|||
Need help with OMC 50 hp 2 cyl to 60 HP conversion
Wish I didn't need the jet, but I run the South Fork of the Snake
through the summer and running a prop would get pretty expensive, though it might be a wash with gas being what it is now. Marine dealers are a bit scarce up here and I don't know where to get a hold of a parts list to compare the two. Any thoughts? Thanks, MV |
#8
posted to rec.boats
|
|||
|
|||
Need help with OMC 50 hp 2 cyl to 60 HP conversion
Rob,
You mention the mid-section tuner as being possibly different. I assume by that you mean the "tin" inside the midsection and not the entire midsection? I can still get that piece and if it is just a matter of replacing that with the carbs and intake to be sure then it seems like a no-brainer. If I need to replace the entire mid section maybe my fishing buddy and I need to loose weight or take less gear until I can afford a real upgrade. MV |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
mast conversion | General | |||
For Peggie: conversion of a Jabsco 37010 Series electric toilets to "Quiet - Flush" | Cruising | |||
Volvo Penta AQ120B Weber Carb Conversion Kit FS | General | |||
jet ski hull to scull conversion? | Boat Building | |||
Another Conversion! Amen! | ASA |