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Author Topic:   40HP vs 25 HP

Westport Whaler posted 03-15-2001 09:18 AM ET (US)
I am looking to repower an older 13' BW (light blue deck -- pre 1970?). Boat is in good shape (including transom) and has a 1961 Evinude (15" shaft) that has seen better days. I think it weighs about 150 lbs and the boat operates well with this motor -- planes with 4 adults.
My dilemma is that I would like power tilt for shallow water operations (wife also really needs it to take boat out alone). This means that I need to repower with a 40HP (2 cycle), but I am concerned about weight (especially with power tilt). Some dealers insist that I should only repower with a 25HP (2 Cycle). I have talked to one dealer who recommends using a 25HP mercury and adding an aftermarket power tilt for around $4000 (sounds high). Finally, I am concerned that the boat will be underpowered with a 25HP (noting that it is rated at the prop as compared to the power head for the old Evinrude 40HP) with 4 adults.
Any advice would be greatly appreciated.
Has anyone repowered a 13' BW (cutout transom) with a 40 HP, 15" power tilt and trim motor?
goldstem posted 03-15-2001 10:34 AM ET (US)
Well, I've run an old 13 hull with a new
30hp johnson, and it ran better than my
1976 40hp johnson did.
I think the advise is pretty sound.
lhg posted 03-15-2001 02:08 PM ET (US)
I had the same hull, first with a 20 on it(not enough power at all), then with a Merc in-line 4 50HP.(picture in 13 Reference section, testimonials) For 4 adults, go with a 40HP. Weight is not an issue. Also look into other threads regarding a 20" shaft installation, highly recommended. Merc 40 2 stroke with oil inj and PT should cost about $3250. Other brands a little more.
CIELO3428 posted 03-17-2001 07:47 PM ET (US)
PURCHASED MY 13 NEW IN 1964 IT HAS BEEN
POWERED BY 40 JOHNSON 7 ON 10 SCALE
A 40 MERC A 6 A25 YAMAHA 2 STROKE AN 8
AND A 30HP 2 STROKE 15" 115 LB NISSAN
sAME AS TOHATSU THIS COMBO IS SIMPLY
PERFECT AT LEAST A 12! BEST PERFORMANCE
IN 37 YEARS. PAID 3300.00 ON LINE FROM
HOUMA MARINE
awares posted 03-19-2001 10:02 PM ET (US)
I am currently repowering a 1968 13' Whaler.
I could not find a motor that I wanted
available with power tilt and trim with a
15" shaft. I was also concerned about the weight because I had a 1976 40hp Johnson
that weighed in at 137 lbs that I removed from the boat.
I have decided to repower it with the 40 hp
Mercury classic with PT&T. This motor is a
long shaft motor.
To be able to do this I am installing a
Hi-Jacker Fixed Jacking Plate that is designed to mount long shaft motors to a short transom. This is available through
West Marine. Look in the 2001 Master catalog
on page 344. This is additional 13-14lbs and
$89.99.
I have chosen the 2 cycle over the 4 cycle for this because I already own a new 2001
13'Sport with a 40hp 4 cycle motor and I am not happy with the hole shot. At least my kids will be able to ski behind this rig.
lhg posted 03-19-2001 10:17 PM ET (US)
I think you have made a good decision, and that little Whaler should run well with a modern 40. You won't believe the difference. The Classic Whaler Association published a report on making this same conversion, about 3 years ago, and he (Jim Knight) loved the rig.
For you engine guys out there, HP to HP, I have heard that the 2 strokes will out accelerate the 4 strokes. Is this true? Awares comments seem to lend support to this theory. So does Mercury's testing of a 135 Opti against a Honda 130 4 stroke.
It will be very interesting to hear of the overall comparisons, not only of the hulls, but of the same brand, same HP engines, 2 vs 4 stroke. Please keep us posted! I'm assuming you don't work for a boating magazine!
lhg posted 03-19-2001 10:22 PM ET (US)
PS. Send JimH a picture of your lift bracket, long shaft installation on the early 13. It would make nice addition to his article.
hardensheetmetal posted 03-19-2001 10:29 PM ET (US)
Awares-
Just wondering if you ever looked into the motor bracket in the picture I posted when we were discussing this in an earlier post. it looked like it was solid aluminum.
Dan
awares posted 03-19-2001 10:32 PM ET (US)
lhg,
Sorry, but I don't work for a boating magazine. I am a manager at a contract manufacturing facility.
My problem is that I can not leave anything alone until it is tweaked to the maximum performance. I think I have some type of sickness, but I can not identify it.
I just want a good quality product that works every time all the time under all situations.
You are right about doing my own testing on
both rigs. I will do that after the restoration and the rigging is complete on both Whaler's. They will both have the 40 hp
Mercurys on them. One of each type. I will
share this information with everyone.
awares posted 03-19-2001 10:56 PM ET (US)
Dan,
I did look into trying to locate the one in the picture. Although I was steered into this bracket by a fellow forum user.
The description from the catalog is as follows...This tough 3/8" thick aluminum bracket provides an inexpensive solution to mounting a long shaft outboard to a short transom. Also works well as a fixed jack plate for all V6 outboards. Handles all outboards up to 225hp. Three engine mounting holes and two transom holes combined with a 3" designed lift allows a total of 5 1/2" of lift with a full four inches of setback.
Model 1930494 THMAR#JP-4FA ShWT14...$89.99
I received mine in today. One clarification about the holes. The description above is true per bracket side.

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Author	Topic: 40HP vs 25 HP
Westport Whaler	posted 03-15-2001 09:18 AM ET (US) I am looking to repower an older 13' BW (light blue deck -- pre 1970?). Boat is in good shape (including transom) and has a 1961 Evinude (15" shaft) that has seen better days. I think it weighs about 150 lbs and the boat operates well with this motor -- planes with 4 adults. My dilemma is that I would like power tilt for shallow water operations (wife also really needs it to take boat out alone). This means that I need to repower with a 40HP (2 cycle), but I am concerned about weight (especially with power tilt). Some dealers insist that I should only repower with a 25HP (2 Cycle). I have talked to one dealer who recommends using a 25HP mercury and adding an aftermarket power tilt for around $4000 (sounds high). Finally, I am concerned that the boat will be underpowered with a 25HP (noting that it is rated at the prop as compared to the power head for the old Evinrude 40HP) with 4 adults. Any advice would be greatly appreciated. Has anyone repowered a 13' BW (cutout transom) with a 40 HP, 15" power tilt and trim motor?
goldstem	posted 03-15-2001 10:34 AM ET (US) Well, I've run an old 13 hull with a new 30hp johnson, and it ran better than my 1976 40hp johnson did. I think the advise is pretty sound.
lhg	posted 03-15-2001 02:08 PM ET (US) I had the same hull, first with a 20 on it(not enough power at all), then with a Merc in-line 4 50HP.(picture in 13 Reference section, testimonials) For 4 adults, go with a 40HP. Weight is not an issue. Also look into other threads regarding a 20" shaft installation, highly recommended. Merc 40 2 stroke with oil inj and PT should cost about $3250. Other brands a little more.
CIELO3428	posted 03-17-2001 07:47 PM ET (US) PURCHASED MY 13 NEW IN 1964 IT HAS BEEN POWERED BY 40 JOHNSON 7 ON 10 SCALE A 40 MERC A 6 A25 YAMAHA 2 STROKE AN 8 AND A 30HP 2 STROKE 15" 115 LB NISSAN sAME AS TOHATSU THIS COMBO IS SIMPLY PERFECT AT LEAST A 12! BEST PERFORMANCE IN 37 YEARS. PAID 3300.00 ON LINE FROM HOUMA MARINE
awares	posted 03-19-2001 10:02 PM ET (US) I am currently repowering a 1968 13' Whaler. I could not find a motor that I wanted available with power tilt and trim with a 15" shaft. I was also concerned about the weight because I had a 1976 40hp Johnson that weighed in at 137 lbs that I removed from the boat. I have decided to repower it with the 40 hp Mercury classic with PT&T. This motor is a long shaft motor. To be able to do this I am installing a Hi-Jacker Fixed Jacking Plate that is designed to mount long shaft motors to a short transom. This is available through West Marine. Look in the 2001 Master catalog on page 344. This is additional 13-14lbs and $89.99. I have chosen the 2 cycle over the 4 cycle for this because I already own a new 2001 13'Sport with a 40hp 4 cycle motor and I am not happy with the hole shot. At least my kids will be able to ski behind this rig.
lhg	posted 03-19-2001 10:17 PM ET (US) I think you have made a good decision, and that little Whaler should run well with a modern 40. You won't believe the difference. The Classic Whaler Association published a report on making this same conversion, about 3 years ago, and he (Jim Knight) loved the rig. For you engine guys out there, HP to HP, I have heard that the 2 strokes will out accelerate the 4 strokes. Is this true? Awares comments seem to lend support to this theory. So does Mercury's testing of a 135 Opti against a Honda 130 4 stroke. It will be very interesting to hear of the overall comparisons, not only of the hulls, but of the same brand, same HP engines, 2 vs 4 stroke. Please keep us posted! I'm assuming you don't work for a boating magazine!
lhg	posted 03-19-2001 10:22 PM ET (US) PS. Send JimH a picture of your lift bracket, long shaft installation on the early 13. It would make nice addition to his article.
hardensheetmetal	posted 03-19-2001 10:29 PM ET (US) Awares- Just wondering if you ever looked into the motor bracket in the picture I posted when we were discussing this in an earlier post. it looked like it was solid aluminum. Dan
awares	posted 03-19-2001 10:32 PM ET (US) lhg, Sorry, but I don't work for a boating magazine. I am a manager at a contract manufacturing facility. My problem is that I can not leave anything alone until it is tweaked to the maximum performance. I think I have some type of sickness, but I can not identify it. I just want a good quality product that works every time all the time under all situations. You are right about doing my own testing on both rigs. I will do that after the restoration and the rigging is complete on both Whaler's. They will both have the 40 hp Mercurys on them. One of each type. I will share this information with everyone.
awares	posted 03-19-2001 10:56 PM ET (US) Dan, I did look into trying to locate the one in the picture. Although I was steered into this bracket by a fellow forum user. The description from the catalog is as follows...This tough 3/8" thick aluminum bracket provides an inexpensive solution to mounting a long shaft outboard to a short transom. Also works well as a fixed jack plate for all V6 outboards. Handles all outboards up to 225hp. Three engine mounting holes and two transom holes combined with a 3" designed lift allows a total of 5 1/2" of lift with a full four inches of setback. Model 1930494 THMAR#JP-4FA ShWT14...$89.99 I received mine in today. One clarification about the holes. The description above is true per bracket side.