150hp inline 6...how much torque?

[zmoz]

I'm just wondering...can anybody tell me how much torque the 150hp mercury inline 6 is rated at?

[Raceman]

I've never seen a rating, but just a guess, based on the fact that the torque/horsepower numbers of all engines are the same at 5250 RPM by definition, and that doesn't seem too far below the 1500's peak, I'm guessing the peak torque would be in the range of 140 to 150.

[Sorry Dog]

I wonder what torque is at 2000RPM?

[Dave S]

At 2000 RPMs there is no talk just knocking pistons. Mercs just like tooo Scream.:rolleyes: Torque is the funktion :D of CID and not stroke or # of cylinders. The rod ratio has some doings to it. That should start a conversation........

[Mark75H]

Sure does Dave, because you are wrong

Call me some time when I am going to be home ... how many times have I told you I am not at home Wednesday and Friday evenings?

[Dave S]

:D Who me??? Wroung??? never:cool: I can't even spell the word.:p Why don't you call Me... nothing bad either, just on the phone. At least when I get off the board.:cool:

[sho305]

Trying to pull a load at 2000rpm my inline sounds just like my big weedeater, when the tall grass wraps around the head and it gets stuck. Bhuuuuuh....nobody home. Dave has beer;) lol

[99fxst99]

ZMOZ-Your CV19 brings back fond memories. We used to ski race out here back in the 70's-80's. Before the Hydrostreams took over the CV16 was very popular. Several with Merc 150's were head of the outboard class. I had a '71 with a '73 135 Johnson. To get it to run right we cut the aft 6' of floor out of it, reinforced the bottom with balsa core, replaced the floor, and straightened the bottom. This took the porpoising out of it and it ran with the nose up like it should. With a warmed up 135 and a Don Henrich cleaver it ran a true 67mph. Not bad for its time. I always wanted to set one up right with a V6. I think it would make a great boat, not a world beater but a sharp, quick, unique package.

[Raceman]

"With a warmed up 135 and a Don Henrich cleaver it ran a true 67mph."

Sounds impossible to me.

[zmoz]

Originally posted by Raceman
"With a warmed up 135 and a Don Henrich cleaver it ran a true 67mph."

Sounds impossible to me.

Sounds like a long time ago...so no GPS. :) Still a hell of alot faster than mine with less HP...

[Dave S]

67 mph is not that fast, so it is possible. I was driving my van at 65 mph with a small boat on top. The fastest the boat ever went...I got PASSED by a house being towed.:eek: It was a mobil home 14foot by 70 foot.:D 99FXST99 did a lot of work to the boat which is the key .

[transomstand]

I know your concerned about getting more performance out your rig. I was posting to another thread you had started. I seem to be seeing quite a few reasonably priced V-6 150's around. Have you considered going this way? Or have you already made a commitment to another inline. If you could get a small V-6, your problem would be solved.

Pete

[zmoz]

Originally posted by transomstand
I know your concerned about getting more performance out your rig. I was posting to another thread you had started. I seem to be seeing quite a few reasonably priced V-6 150's around. Have you considered going this way? Or have you already made a commitment to another inline. If you could get a small V-6, your problem would be solved.

Pete

I just knew this was going to turn into a how can I go faster thread. :D I thought I already had a good inline power head coming my way, but tunnelboat doesn't seem to be replying to me anymore. :( How cheaply could I get a V6, and what could I expect for speed? I don't know...if I'm going to go that far, I'm thinking the V6 would be better on something like a hydrostream.

[transomstand]

Seems like I've seen a few in the buy and sell forum here for $1200 or less. And this is sure the time of year to buy. I keep looking at that ski bar in your boat and I'm thinking that your going to give away too much low end in an effort to pick up your top speed. With the inline, you can't afford to give much away. If you move up to a V-6, the difference will be like night and day. I have to think that going to a V-6 would give you 60MPH with no setup work and plenty of pulling power on the low end. The bigger engine can transfer to a new hull later. It just seems like you open up better options going to the bigger engine now.

Pete

[Raceman]

Bolting a low horse V6 on that boat might not give you the increases you expect over a good 150 Zmoz. When the first V6 175 (crankshaft rated horsepower) came along in 1976 a bunch of guys rushed out and traded their inline 1500's on everything from bassboats to performance V bottoms. I did it with my old 18' Sidewinder also. As just a bolt on, the difference was disappointing. There's no question there's a lot of potential for improvement with the V6 and you can go way over 300 HP with relatively common modifications, but just bolt on a stock low horse V6 where the inline was and you may not pick up as much as you think initially.

"67 mph is not that fast, so it is possible"

Dave, I think it's IMPOSSIBLE with a "warmed up" 100 cu in crossflow 135, given early 70's propeller and setup technology. When I bought my first 15 Ally it was a professionally set up race boat running out of a stable of 6 or 8 boats. It had a shortshaft 1500 Merc. This boat would run upper 60's and it was light and the bottom was straight and strong. At the time I bought it in about '74 the J Production APBA kilo record was either about 76 and raised to 79 and change shortly after, or had already been raised fairly recently, I can't remember exactly the order. We worked with my boat for over a year and never could get it to run over 76 on a Keller speedo, and couldn't figure how Benny had his running like it did......... up around 80. As a matter of fact, until I went to the new J powerhead, about 72 was all mine would show. Of course Benny was in Merc's favor back then and no tellin' what kind of help he had.

The point in all this being, 70 MPH wasn't a given then as it is now and a large percentage of early V6 bassboats wouldn't do it even though the speedo's would say otherwise. I had a friend with a CV16 and a 76 model 1750 Merc and it never got anywhere near 67 MPH, and if I remember right we struggled to get it into the 60's on my Norskog even though he tried every prop I owned. Back then, nobody had dreamed up jackplates and setback, so about the only mods anybody did as far as transom height was raise the engine up by redrilling.

[Mark75H]

Back then, nobody had dreamed up jackplates

actually the earliest jackplate I know of (from a major manufacturer) was 1961

The '61 Scott McCulloch 14ft three point "Fantasy"/75hp "Custom" package came with an electro-hydraulic jackplate

[zmoz]

Originally posted by transomstand
I keep looking at that ski bar in your boat and I'm thinking that your going to give away too much low end in an effort to pick up your top speed.

Actually, I don't ski, although maybe next year I might try it. Mainly the pole is there because if I'm not driving I like to be standing up while we're at full speed. :D

[Rickracer]

Bob's 5.5" manual jackplate, a 24 Raker, and some bottom work, light fuel load, no excess cargo, it would do an honest 69~70. Normal skiing load, 63 to 65. That was according to a speedo that had been checked against a gps on several occasions, and found to be within 1 mph slower than what the gps said. Now I have to admit that the 135 was not stock, but had not received anything but good old fashioned porting, compression, and the bigger 140 carbs.(oh and glass reeds :D ) It can be done. :cool:

[transomstand]

The way I see it, the V-6 makes the most sense. If you replace the powerhead and want more top end, you're buying a jack plate with offset and at least one new prop. If you decide to ski, you'll need another prop, and the more expensive hydraulic jack plate to make height change easier. If you invest the same money toward a V-6 you can do the same with the engine bolted to the transom. You pick up top end, and you can ski with the same prop. Plus, you now have a platform to work from that has more speed potential if you want to spend more. I just feel that with the inline your limiting your options too much.

[99fxst99]

Raceman, we were in fact running good numbers, on a calibrated Keller (we called it the lie detector), not a boat store Airguide. As Rickracer noted, work and prep were the key. Before coring and straightening the bottom the best it would run was 62-62 and porpoise like hell. The motor had hot heads, relieved exhaust, worked intake, reeds, blocks and carbs, and some port work. It was a '73 which seemed to be strongest. Not real reliable, but pretty strong. Beat the othe 2 CV16s with 150s because they didn't know/care about bottom work In its stock form we ran the motor in JP, then called Family J, on a 15' Allison and got about 73-74 out of it. In 74 we went to the 150 Merc E motor and got into the high 70s. That boat won the 1st heat of the nationals in Eufaula going away and jumped the gun the 2nd heat. Boat was blue and white, #9999. We built our own manual jacking plates and steering tie bars. A Henrich 27 cleaver was the hot prop, but it was solid spline. We had to bore the OMC spline out and press in and pin a bronze Merc spline. This was before Merc made cleavers, only the 2blade round eared prop.

[Dave S]

A old thread.:rolleyes: 9999 I don't doubt you story. Where are you in Va?

[99fxst99]

Dave, yeah its old. I stumbled back onto it surfing around this afternoon. I'm in Portsmouth. Used to be a hotbed of boat racing here, there were probably as many titles held by Portsmouth natives as any other town in the US. Inboard, OPC, Stock Outboard, Alky, all had record or title holders from here. I grew up in a great place for fast boats. Raced JP, ModVP, SE, and ski racing. Truly the "good ol' days"