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Author Topic:   Commercial Grade Evinrude

TheBigTurnout posted 04-16-2003 08:27 AM ET (US)
Bigshot (all),
Can anyone out there shed any light on the distinction between a commercial vs consumer grade Evinrude engine? I am looking at a boat currently that is running a commercial grade, 1991 Evinrude 55hp. I've been told that they are constructed with better grade parts etc, etc....but wanted to hear it from you guys. Whats the deal here?
Bigshot posted 04-16-2003 09:47 AM ET (US)
They have beefier and probably better built engines. The gear ratios are different for pushing heavy loads, etc. Other than that no biggie. The 55 I believe has a pull start.
Steve Leone posted 04-16-2003 10:58 AM ET (US)
They have a conventional fuel pump instead of a VRO if they are SPL models. Most commercial models sport larger lower units. Steve
TheBigTurnout posted 04-16-2003 11:05 AM ET (US)
Bigshot,
If they geared lower to push bigger loads how does that effect performance. (ie: "Getting out of the hole"/top end?)
Bigshot posted 04-16-2003 11:12 AM ET (US)
Might not but it will make propping different. Instead of running a 17" you may need a 19" due to higher gear ratio etc. I have seen a few Montauks with 100hp commercials on them, I actually almost bought one new. I imagine that in order to handle commercial use, they have tighter tolerances, etc and may just be a better built engine, it may be BS and they just add a tiller for comercial crabbers etc.
elaelap posted 04-16-2003 11:24 AM ET (US)
Bigshot & others,
Can you tell me why "Bigfoot" gear ratios are referred to as "higher"? You folks are not alone in this; the manufacturers' manuals and brochures use the same adjective. This seems counter-intuitive, since automobile gearing which requires the engine to turn over more often to drive the car forward at the same speed is referred to as "lower."
Do I have this completely backwards? It's my understanding that my Yami High Thrust's 2.3 gear ratio means that the motor turns over 2.3 times for each turn of the prop, as opposed to a comparable motor with say a 1.8 ratio, where the motor only turns over 1.8 times for each prop rotation. If this is so, seems to me that I'm running lower, not higher, lower unit gears.
Tony
hauptjm posted 04-16-2003 11:31 AM ET (US)
elaelap,
Higher refers to the ratio. Yes the same applies to the automobile, but the "lower" gears in a car refer to the gear pattern. Hence, 1st is lower than 2nd. Just a thought.
TheBigTurnout posted 04-16-2003 11:35 AM ET (US)
Bigshot,
Thanks for your input. The engine that I'm looking at actually doesn't have a tiller...but you were right that it does have a pull start. In your opinion, is it feasible to put an electric start? (And before anyone lays into me for claiming I can't pull it over, its for my girlfriend's use! :))
elaelap posted 04-16-2003 11:44 AM ET (US)
Thanks hauptjm, clarity is all.
Tony
Sal DiMercurio posted 04-16-2003 04:51 PM ET (US)
It's actually refered to as higher, but in reality it is a lower geared lower unit.
Your engine will turn more rpms per rev of the prop then a sportsman engine, not that much more but close to 1/4 of a rev of the prop with a commercial engine.
Yes they are a better built engine, many bolts & screws are s/s compared to just plain zinc covered steel.
Sal
Steve Leone posted 04-16-2003 10:27 PM ET (US)
If you are converting to electric start O.M.C. used to carry the whole conversion kit. I believe you will need a starter (of course), a solenoid, a toothed or "geared" flywheel, a charge coil, a voltage regulator, and a choke solenoid. A key switch with 3 positions may in order also. Steve
Sal DiMercurio posted 04-16-2003 10:38 PM ET (US)
Don't forget the rectifier.
Sal
ducktwin posted 04-16-2003 10:47 PM ET (US)
The Big Turn Out,
The commercial engines were not any different internally. They were not manufactured to any tighter specifications.
However, Sal is correct that they did feature a great deal of stainless fasteners and other components subject to the weather.
Usually, the commercial's had the next series higher gearcase. As an example, the 3-cylinder engines had a V-4 gearcase and so on. That was the difference in gear ratio. The larger gearcases allowed smaller engines to swing larger diameter props.
SteveFC posted 04-18-2003 01:50 PM ET (US)
TheBigTurnout,
I have an Evinrude 40 converted to electric start. Although it's rigged for console operation now, it was originally a tiller motor. For this reason, it had a kill button on the motor itself, and the electric start kit came with a start button to be mounted on the motor. My dealer ran wires to relocate both buttons to the console. I still have to go back to the motor to use the choke, but that's no big deal.
So even if the motor you're looking at is a converted tiller model, the electric start conversion is easy. And having used the rope start for several years, I can say from experience that electric is a BIG improvement. Good luck.
donel posted 04-19-2003 10:57 AM ET (US)
i just began using a '85 montauk (that i restored) with '93 commercial evinrude 100 hp
using the same prop as on our '85 outrage 22' with 235 johnson. will not need a fin as on the OR or the '68 nauset with 115 johnson.
hole shot is impressive, get 42 mph @ 5,600 rpm - gps. better mpg than nauset.
prop is 14.5 x 19. (14.5 x 21 took off like rocket ship - only rev'ed to 5,000 rpm).
have no book, but was told by mechanics that more stainless parts are used and gearcase is V6.
love the combo so far.
luck
don

Bigshot posted 04-21-2003 11:33 AM ET (US)
Reda the brochure as well....different heads to be able to use lower octane gas in foreign countries.

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Author	Topic: Commercial Grade Evinrude
TheBigTurnout	posted 04-16-2003 08:27 AM ET (US) Bigshot (all), Can anyone out there shed any light on the distinction between a commercial vs consumer grade Evinrude engine? I am looking at a boat currently that is running a commercial grade, 1991 Evinrude 55hp. I've been told that they are constructed with better grade parts etc, etc....but wanted to hear it from you guys. Whats the deal here?
Bigshot	posted 04-16-2003 09:47 AM ET (US) They have beefier and probably better built engines. The gear ratios are different for pushing heavy loads, etc. Other than that no biggie. The 55 I believe has a pull start.
Steve Leone	posted 04-16-2003 10:58 AM ET (US) They have a conventional fuel pump instead of a VRO if they are SPL models. Most commercial models sport larger lower units. Steve
TheBigTurnout	posted 04-16-2003 11:05 AM ET (US) Bigshot, If they geared lower to push bigger loads how does that effect performance. (ie: "Getting out of the hole"/top end?)
Bigshot	posted 04-16-2003 11:12 AM ET (US) Might not but it will make propping different. Instead of running a 17" you may need a 19" due to higher gear ratio etc. I have seen a few Montauks with 100hp commercials on them, I actually almost bought one new. I imagine that in order to handle commercial use, they have tighter tolerances, etc and may just be a better built engine, it may be BS and they just add a tiller for comercial crabbers etc.
elaelap	posted 04-16-2003 11:24 AM ET (US) Bigshot & others, Can you tell me why "Bigfoot" gear ratios are referred to as "higher"? You folks are not alone in this; the manufacturers' manuals and brochures use the same adjective. This seems counter-intuitive, since automobile gearing which requires the engine to turn over more often to drive the car forward at the same speed is referred to as "lower." Do I have this completely backwards? It's my understanding that my Yami High Thrust's 2.3 gear ratio means that the motor turns over 2.3 times for each turn of the prop, as opposed to a comparable motor with say a 1.8 ratio, where the motor only turns over 1.8 times for each prop rotation. If this is so, seems to me that I'm running lower, not higher, lower unit gears. Tony
hauptjm	posted 04-16-2003 11:31 AM ET (US) elaelap, Higher refers to the ratio. Yes the same applies to the automobile, but the "lower" gears in a car refer to the gear pattern. Hence, 1st is lower than 2nd. Just a thought.
TheBigTurnout	posted 04-16-2003 11:35 AM ET (US) Bigshot, Thanks for your input. The engine that I'm looking at actually doesn't have a tiller...but you were right that it does have a pull start. In your opinion, is it feasible to put an electric start? (And before anyone lays into me for claiming I can't pull it over, its for my girlfriend's use! :))
elaelap	posted 04-16-2003 11:44 AM ET (US) Thanks hauptjm, clarity is all. Tony
Sal DiMercurio	posted 04-16-2003 04:51 PM ET (US) It's actually refered to as higher, but in reality it is a lower geared lower unit. Your engine will turn more rpms per rev of the prop then a sportsman engine, not that much more but close to 1/4 of a rev of the prop with a commercial engine. Yes they are a better built engine, many bolts & screws are s/s compared to just plain zinc covered steel. Sal
Steve Leone	posted 04-16-2003 10:27 PM ET (US) If you are converting to electric start O.M.C. used to carry the whole conversion kit. I believe you will need a starter (of course), a solenoid, a toothed or "geared" flywheel, a charge coil, a voltage regulator, and a choke solenoid. A key switch with 3 positions may in order also. Steve
Sal DiMercurio	posted 04-16-2003 10:38 PM ET (US) Don't forget the rectifier. Sal
ducktwin	posted 04-16-2003 10:47 PM ET (US) The Big Turn Out, The commercial engines were not any different internally. They were not manufactured to any tighter specifications. However, Sal is correct that they did feature a great deal of stainless fasteners and other components subject to the weather. Usually, the commercial's had the next series higher gearcase. As an example, the 3-cylinder engines had a V-4 gearcase and so on. That was the difference in gear ratio. The larger gearcases allowed smaller engines to swing larger diameter props.
SteveFC	posted 04-18-2003 01:50 PM ET (US) TheBigTurnout, I have an Evinrude 40 converted to electric start. Although it's rigged for console operation now, it was originally a tiller motor. For this reason, it had a kill button on the motor itself, and the electric start kit came with a start button to be mounted on the motor. My dealer ran wires to relocate both buttons to the console. I still have to go back to the motor to use the choke, but that's no big deal. So even if the motor you're looking at is a converted tiller model, the electric start conversion is easy. And having used the rope start for several years, I can say from experience that electric is a BIG improvement. Good luck.
donel	posted 04-19-2003 10:57 AM ET (US) i just began using a '85 montauk (that i restored) with '93 commercial evinrude 100 hp using the same prop as on our '85 outrage 22' with 235 johnson. will not need a fin as on the OR or the '68 nauset with 115 johnson. hole shot is impressive, get 42 mph @ 5,600 rpm - gps. better mpg than nauset. prop is 14.5 x 19. (14.5 x 21 took off like rocket ship - only rev'ed to 5,000 rpm). have no book, but was told by mechanics that more stainless parts are used and gearcase is V6. love the combo so far. luck don
Bigshot	posted 04-21-2003 11:33 AM ET (US) Reda the brochure as well....different heads to be able to use lower octane gas in foreign countries.