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Author Topic:   1982 35hp Evinrude Specs
mojack posted 06-24-2003 09:17 PM ET (US)   Profile for mojack   Send Email to mojack  
I've looked all over the place and I can't find the specs for a 1982 35hp Evinrude. Does anyone know where I could find them? Thanks guys!
Peter posted 06-25-2003 07:29 AM ET (US)     Profile for Peter  Send Email to Peter     
35 HP at the crankshaft at 5500 RPM. 31.8 cubic inch two cylinder cross-flow design. This design was introduced in 1976 and is still in production today although it is now called a 30 HP because the horsepower is measured at the prop shaft. At some point in the early '80s, OMC raised the gear ratio of the lower unit. This is an excellent motor for a 13' Whaler.
Dr T posted 06-25-2003 10:26 AM ET (US)     Profile for Dr T  Send Email to Dr T     
It does get excellent mileage (I estimate about 8 mpg during cruise). There is a Clymers manual that covers the engine available.

However, it is relatively low on torque and if used at higher altitudes, it is fairly sensitive to prop selection. The standard prop for the 13 Sport is a 10x13. I would suggest an Aluminum prop (i.e. almost anything is better than the SS prop I have for the engine).

tds

Peter posted 06-25-2003 11:18 AM ET (US)     Profile for Peter  Send Email to Peter     
Interesting,

For a 1977 Evinrude 35, I had a 10 1/2 x 11 aluminum propeller that I used for high loads and general water skiing and a 10 x 13 SST (stainless) that I used for "speed" and water skiing when I had "expert" skiers. I thought the SST was an excellent propeller. It stayed "hooked up" much better than the aluminum version, particularly in a chop.

Bigshot posted 06-25-2003 11:27 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Light loads the SST is great. I even ran a 10x15 on my 82 rig and with just my 120lb ass she would hit 5400 and probably 36+. Add another 120lb person and she dropped to 5100, etc. The 10x13 is perfect.
Dr T posted 06-25-2003 11:46 AM ET (US)     Profile for Dr T  Send Email to Dr T     
Peter and Nick both had much better SST props than mine. Either that, or my engine is weak. And, both were operating at sea level (I used mine around Dallas, which is about 600 ft. MSL).

I use the 10.5 x 11 at this altitude (Denver Area, about 5500 ft. MSL). In the mountains (7000+ Ft MSL), the 11 pitch prop is marginal and I have to drop back to a 9 pitch prop.

tds

whalernut posted 06-25-2003 06:38 PM ET (US)     Profile for whalernut  Send Email to whalernut     
I had a 1871 13` Sport(15 inch shaft) with a 1976 35 Rude. I thought it was a perfect as it could get, fast and very fuel efficient, and it would troll very slow all day long. I truly miss that little boat and motor, but love my Currituck!! Jack.
whalernut posted 06-25-2003 06:40 PM ET (US)     Profile for whalernut  Send Email to whalernut     
That should read 1971 :) jack.
Bigshot posted 06-26-2003 01:04 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
The 76 35 redlined at 6k. I know by 78 it was down to 5500.
mojack posted 06-29-2003 05:17 PM ET (US)     Profile for mojack  Send Email to mojack     
Thanks for the information. Does anyone know how much the motor weighs? I am considering putting my 25hp Honda on the back of it and I wanted to make sure that the weights were similar. I like the 35 Evinrude very much but the Honda has only 40 or so hours on it and is really easy on gas. Actually I am surprised at the excellent fuel economy of the 35 even pulling the kids around the bay. Heck if I keep on typing I may just leave the 35 on there and sell the Honda!!!
mojack posted 07-06-2003 07:17 PM ET (US)     Profile for mojack  Send Email to mojack     
What should the compression of the cylinders be?
Bigshot posted 07-07-2003 10:07 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Weight for a 20" electric start 35 is 121lbs.
mojack posted 07-07-2003 06:23 PM ET (US)     Profile for mojack  Send Email to mojack     
Thanks Bigshot! That's only about 30# more than the Honda and if the Evinrude I have now is comparable to a 30hp built by today's standards then it would seem that the 25 Honda would perform very similar to the 82 35hp Evinrude. Sold your hull yet?
Bigshot posted 07-08-2003 09:34 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
And trailer....waiting for the deposit.
quickfarms posted 07-08-2003 10:37 AM ET (US)     Profile for quickfarms  Send Email to quickfarms     
If your honda is a 20" shaft I would be interested in purchasing it. Actually I would be interested in the 35 if you decide to use the honda.
mojack posted 07-10-2003 08:27 AM ET (US)     Profile for mojack  Send Email to mojack     
The Honda is a 1999 (bought new 8/15/2002) 20" 25hp remote with about 35 or 40 hours on it. Paid $3,500 (motor tax and intall), still under warranty until 8/15/04. [The Honda is currently on a wooden boat that I made and I was thinking of swapping motors and selling the wooden boat (with ugly but strong trailer) with the Evinrude.]

The Evinrude is an 1982 20" 35hp remote-difficult to estimate hours but the owner was nearly 80 from what I remember so I doubt it was used much over the last 10 years or so. The owners son had the motor serviced this spring and foot grease, water pump and several other things were done. I noticed last weekend that the compression was tested at some point (don't know when) and the top cylinder was 50 and I think the bottom cylinder was 30. I'll recheck that this weekend when I go back down to the bay and let you know. This motor runds like a top. Starts every time. Doesn't smoke badly at all. The condition is very good. There is some minor paint fading on the front edges of the cowling but otherwise it is in great shape. Like I said on earlier posts, I might just keep the Evinrude and sell the Honda!

I'm not exactly sure what this Evinrude should cost but I had thought about selling the Evinrude on the wooden boat on the trailer for around $1,500. I really think this Evinrude by itself should be worth around $850. It is in just that good of condition.

_Just a side note-I have a 1972? Johnson 20hp 15" shaft tiller that runs but needs work. I figure it should be worth $175.

mojack posted 07-11-2003 09:32 AM ET (US)     Profile for mojack  Send Email to mojack     
Congrats Bigshot!
mojack posted 07-15-2003 12:39 PM ET (US)     Profile for mojack  Send Email to mojack     
What should the compression be for this motor?
mojack posted 07-16-2003 08:35 AM ET (US)     Profile for mojack  Send Email to mojack     
Compression Bump?
Bigshot posted 07-16-2003 10:53 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
There are no real compression numbers beause EVERY guage is different. If cyls are within 10-15% of each other then it is fine. They also need to be above say 85PSI. Some engines run 150PSI, others run 95. Does not mean the 150 is a stronger engine, it is just has a higher compression ratio. Just like a car, some engines have 8:1 and some have 10.5:1. Now if you compare 2 diferent 35hp OMC's and one has 130psi and the other engine has 150, then the 150 engine is in better shape if identical from the factory.
mojack posted 07-16-2003 11:28 AM ET (US)     Profile for mojack  Send Email to mojack     
I just went out and looked at my 82' 35hp Evi. The numbers were 30 on the top cylinder and 50 on the bottom cylinder. Does that mean it's on its last leg? It runs really strong. I can't figure it out how those numbers could be correct?
mojack posted 07-16-2003 11:30 AM ET (US)     Profile for mojack  Send Email to mojack     
It hardly even smokes. There is evaporative smoke from the two exhaust/water ports in the back but the prop exhaust hardly smokes either. Totally confused now.
Bigshot posted 07-16-2003 02:52 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Would not run on 30 or even 50 lbs. Go buy a new Comp tester that screws in at local parts store($22+/-) and get a better reading.
mojack posted 07-17-2003 08:17 AM ET (US)     Profile for mojack  Send Email to mojack     
I was thinking that too. Just didn't add up. Have you got a new boat yet?
Bigshot posted 07-17-2003 10:10 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Yup....should be ready for assembly this weekend. Bought an 86 Newtauk and it is being "freshened up" at the fiberglass shop with spectrum gelcoat. Pick up the new trailer tomorrow.
mojack posted 07-17-2003 09:19 PM ET (US)     Profile for mojack  Send Email to mojack     
Don't forget to post some pictures somewhere!
Bigshot posted 07-18-2003 11:30 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Jimh said he might do a Cetacea page on it in the future.....if my pics are clear:)
sandhammaren05 posted 03-02-2009 07:21 AM ET (US)     Profile for sandhammaren05  Send Email to sandhammaren05     
Compression on a 20/25/30/35 OMC 1976-1990 (or later) should be around 130 psi. These motors are used in 'GT-Pro' clas racing in Minn., and easily turn 7000 RPM. I have a rebuilt 1983 model on a 15' Allison bass boat that runs 41 mph (Garmin GPS) turning a self-modified 14" Stilletto prop about 6700 RPM. The 1977 and later 25 and 30 can be converted to 35 hp by installing a 35 carb. The later 20 hp models can be converted to 35 hp by installing the 35 carb and filing out the intake manifold opening. The 1977-'78 25 has a different gearcase than the 35, but the powerhead (exhaust tuner and all) is the same a the 35 except for the carb. Would be nice to have a small Whaler for my 1979 OMC 15, those little motors are officially 'rated' at 6000-7000 RPM. You can convert the 9.9 OMC to 15 hp by installing a 15 carb, which is why the 15 carbs go for up to $200 on Ebay.
sandhammaren05 posted 03-02-2009 07:29 AM ET (US)     Profile for sandhammaren05  Send Email to sandhammaren05     
Equal compression in both cylinders is not an adequate test: compression is required for acceleration! Good compression is 130-140 psi, I got 150 psi by milling the head .060". 90 psi is certainly too weak, my 1983 had 90 when I bought it on ebay in Aug., 2008 ($650 plus shipping), so I completely rebuilt it. I offer powerhead rebuilding in Houston each fall, otherwise I'm in Austria (where I'm rebuilding a 1980 35 in the cellar). A good 20/25/30/35 can be bought on Ebay during the winter for $500-600. Don't wait to late spring or summer to look for one, they sell then for upwards of $1000.

Specs for 1976-1990 OMC 35s are the same, just buy a used service manual on Ebay ($10-$30). The pre-1979 models had cooling problems, note that the powerhead gasket and downhousing changed in 1979 (see the Evinrude/Bombardier parts list on the web).

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