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Author Topic:   Mercury 60 hp Fourstroke Bigfoot-Montauk
alvispollard posted 12-05-2002 11:04 AM ET (US)   Profile for alvispollard   Send Email to alvispollard  
"Boating" Magazine (December,2002) says the Mercury 60 hp Fourstroke Bigfoot is the optimum motor for a Montauk. Equipped with a Smartcraft multifunction gauge with SOLAS Alcup four-bladed propeller.
EFI
41.3 hrs running time - used 37 gal.
8 mpg - 18-22 mph (4000-4500 rpm.
4.2 mpg at same rpm for 90 2 stroke engine which was only 4 mph faster.
Planed in 3 sec. with 2 passengers.
1000 rpm - 4 mph (20 mpg).
Prop turns 2.30:1 reduction.
31 mph - top speed.
264#
$5319 - Cincinnati Bass Pro Shop
Range with 28 gal. tank:
1000 rpm-4 mph-.2 gph- 560 mile range
1500 rpm-5.6 mph-.4 gph- 392 mile range
3000 rpm-10 mph-1.4 gph- 198 mile range
3500 rpm-12.6 mph-1.9 gph- 184 mi. range
6000 rpm-31.1 mph-5.4 gph- 163 mi. range

With my yamaha 8 hp 4 stroke kicker, I can troll for 5 full days on 3 gal. tank. With above motor, I can get to the fishing spots just as fast in 1'-3' waves and run 5 days on 28 gal. tank.
87# + 267# = 354# (About = to 90 2 stroke)
No oil expense.
$10/day.
Hard to beat.
What do you think?

Bigshot posted 12-05-2002 02:49 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Read that....wished they would have stated what year Montauk it was that he repowered. I am also convinced he needs some prop swaps. 31mph is pretty slow. I know some with 50's are getting 34. My 70 is doing 39. I can't imagine how 10hp would shave 8mph. I would like to see that with a quicksilver SS prop and I bet we could get close to 35 or so. Those Solas are kinda frumpy from what I have read. Plus with a 3 second plane time, he would not suffer if it took 5 seconds.
mbking1 posted 12-05-2002 05:32 PM ET (US)     Profile for mbking1  Send Email to mbking1     
I have this engine on my 99 Montauk and LOVE IT. Mark
mbking1 posted 12-05-2002 05:47 PM ET (US)     Profile for mbking1  Send Email to mbking1     
I must give full credit for my engine selection to Admiral Clark Roberts of the Spruce Creek Navy. He suggested this engine hands down in April 2002. Many thanks Clark.
My max speed is appx 31 as well. I would welcome any suggestions on a prop. I am using a gray alum prop. Am not sure how or if to proceed on prop upgrade if that is all they got out of their test boat. Mark
dgp posted 12-05-2002 06:14 PM ET (US)     Profile for dgp  Send Email to dgp     
I don't understand the boating press' love affair with the Bigfoot. The Montauk hull is so efficient it only needs 35HP for planning speeds. Why do they think it needs such a big gearbox?
I have a '01 Mercury 50HP carb'd four stroke (all Merc, non-Bigfoot) on my classic smirked Montauk with a SS Vengeance prop and at 6000 RPM I've recorded 34 MPH on a GPS.
At 4000 RPM I'm running at 19-20 MPH and using 1.2-1.3 GPH.
mbking1 posted 12-05-2002 07:34 PM ET (US)     Profile for mbking1  Send Email to mbking1     
Question: At 6000 RPM, are you doing damage to the engine? Mark
dgp posted 12-05-2002 10:28 PM ET (US)     Profile for dgp  Send Email to dgp     
No damage. Engine is rated 50HP @ 6000 RPM and I have it prop'd for 6000 RPM at wide open throttle (WOT).
Bigshot posted 12-06-2002 10:04 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Depends on the load you "usually" carry. WOT range is usually 5000-6000 rpms. If you want a better cruise and usually ride with just 2-3 people and gear, nothing wrong with propping it to run 5500 WOT and run the numbers. If I could cruise at 4500@25mph instead of 20mph and only lose 500 rpm at WOT, I would do it, especially if at 5500 I was getting 34 instead of 31. The range is there to play with, so play with it and try some different props. When I ran my boat initailly it was doing like 36 with a 17" prop at 5800. With a 19" it runs 39.5 @ 5500, so 19" it is.

I also notice that she runs better with 120 hours than with 20. I was doing 5800 with the 17 alum last year, now I am running over 6k with it9just ran it again last week). With my engine, it did losen up and now runs much better, that is not the case with any 2 stroke I ever owned. After 10 hours, that is the best she'll ever run with a 2s.

weekendwarrior posted 12-07-2002 12:59 AM ET (US)     Profile for weekendwarrior  Send Email to weekendwarrior     
I've got a 50HP on my 17' montauk with the stock Honda 11.25 x 13" prop and I have seen 32mph but it's past the 6000 rpm redline (peak HP is at 5750 rpm). At 6000 I'm right about 30mph. At 5k rpm I'm usually somewhere in the area of 20 mph + or - a couple of mph. With a few people in the boat it will run right at about 5900 rpm WOT and I can pull up a wakeboarder with 4 people still in the boat (haven't tried 5 yet) so I think I'm proped just about optimal for what we use the boat for.

I have a basically brand new powertech SS prop (about 1 hour on it) that is the same size and pitch and I haven't tried it with this boat, but with my old smaller boat it brought the RPM down a few hundred RPM which is too much for what I use the boat for (anyone need a SS prop for a 50HP Honda?).

Bigshot posted 12-09-2002 09:27 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Like I said you do NOT have to be at redline, you can be under it but not more than say 500 rpm's. Try the SS prop on that Honda, I think it would be better if you dropped a copuple hundred rpm's.

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