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Author Topic:   Thrilled with 40hp Merc 4 stoke at 7000'
davidgarth posted 07-14-2001 11:17 AM ET (US)   Profile for davidgarth   Send Email to davidgarth  
I thought I'd share the test results I just ran on my new (15 hours of use) 2001 40hp Merc 4 stroke on my 2001 13' Sport.(Engine trimmed all the way down)

The 15" pitch prop which came with the engine gave me only 5400 rpm at sea level, so I traded for a standard Merc 3 bladed 13" and and 11".

At sea level, the 13" gives me 5800 rpm at 32 mph (gps) with two aboard and gear.(With some up trim you can get 6000 rpm and 34 mph)

At Shaver Lake, 5,300 feet, I switched to the 11" pitch prop. WOT was 6000 rpm at 28 mph. At 4000 rpm I was still planning nicely at 18 mph.

At Huntington Lake, 7,000 feet, 11" pitch prop, I got 5800 rpm, 27 mph.

At all altitudes, the engine ran very smoothly, started easily, and the gas mileage (although I didn't accurately measure it) seemed fantastic. The boat came out of the hole well and the mid range power was excellent.

I am extremely pleased as some people had said a carburated engine just won't perform properly at higher altitudes, and that only an EFI engine would work. This is not true in my case.

BTW, The boat handles very well with this engine and its 200 pounds.

CarlRobert posted 07-14-2001 11:44 PM ET (US)     Profile for CarlRobert    

Just got back this afternoon from Lake Tahoe, where I used my 62' 13 Sport with a 2002 Merc 40 hp 4 stroke. The engine idled a little rougher than at sea level (Delta), but I too noticed no loss of performance at the high elevation. The power tilt and trim is simply fantastic. I was using a 14" ss Trophy Sport 4 blade prop.

I did encounter a drawback to the weight of the engine in Tahoe that I had not encountered in the sheltered lakes and Delta around home. With the old style 15" transom, I did get a little water over the transom if I backed off the throttle quickly. The fact that it was breezy with a moderate chop didn't help.

I beached the Classic on Baldwin Beach to picnic and get some good photos of the boat, but got several gallons of water over the transom when several "cookie cutter" ski boats raced by less than 100' from shore causing some good sized wakes. So, my 12 year old son and I motored out. We got the boat on plane in the now moderate chop and with my son at the helm, I crawled back to the motor well and pulled the plug, allowing the water to drain..what a rush!

Tsuriki BW posted 07-15-2001 12:43 AM ET (US)     Profile for Tsuriki BW  Send Email to Tsuriki BW     

Off topic, but I spent a lot of time at Shaver lake, but practically grew up at Hungtinton. Spend most of school vacation there. Fished Racheria Creek a lot as well as the lake. Stayed at the campground on the left just before you went over the bridge. (Haven't been back for a long long time so things may have changed). Lots of memories there.

Also used to stay at Pismo Beach a lot also.


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