everude 9.9 vm 91 kuinka kuristettu?

Kyllä lyhenee. 9,9 kestää 40 vuotta ja 15 vain 35 vuotta.

... mutta 91-mallissa myös pakopuolela on eroja:

http://www.moottorivene.info/keskustelu/peramoottorit/hyva-linkki-evinruden-johnsonin-omistajille/0/

http://www.sschapterpsa.com/ramblings/OMC/OMC%20info.htm

http://www.sschapterpsa.com/ramblings/Johnson%209.9_15.htm

Viimeisestä linkistä (jossa myös hyvät kuvat, kannattaa lukea):

"Difference between the 9.9 & 15hp : When they designed this series of motors, they designed it as a 15 hp & then detuned it with a different carburetor for the 9.9. When the 9.9hp and 15hp came into being in 1974 and up thru 1978, the only real difference between the two motors was the carburetor. In 1979 they added a shim, part #325038, (one for each cylinder), behind the leaf valves & under the stop plate for the 15 hp, apparently to allow the motor to suck more fuel & air mixture in.



It is my experience that the 15 hp does not idle down as slow as the 9.9 does. It should not really make that much difference as at an idle they use a different idle jet than the main jet, except that the 15 has a larger throat size & apparently needs slightly more fuel even at an idle (trolling speed). So if you intend to troll for trout at a SLOW speed, stay with the 9.9 carburetor, however if you want it for a backup motor & salmon troller then consider the 15 hp.



The outside visual dimensions of both carburetors appear the same, unless you look inside the throat. If you look in from the rear, you will have to position the throttle plate to a horizontal position to be able to see the throat very well. The 9.9 hp carburetor’s internal throat is .625 dia., 15 hp internal throat is .875 dia. up until late 1987 when they went to a plastic topped carburetor. The outlet or rear throat dia. is the same on both to match the manifold port dia. The idle jet venturi system is also slightly different between the two. The part number for the the pre 1987 9.9 hp Carburetor Assembly is #388936, while the 15 hp Carburetor Assembly is #338273. This increased throat dia. & larger main jet allowed it to breather better & pull more fuel in, increasing the RPM about 1000 RPM.

In 1981 there was a change made in the inner exhaust housing for the 15 hp OMCs only. It was a sort of tuned round exhaust housing, allowing the engine to again breathe better, which in addition to the larger throated carburetor, & the leaf valve shim gained about another 10% in overall HP to put these OMC engines on par with the Japanese imports. The 9.9 square inner exhaust housing & no shim for the leaf valve, stayed the same as it was. The big difference in the performance between the 9.9 & 15 hp will be in the last 1/3 of the throttle range where the increased fuel/air flow of the carburetor will be readily apparent with the increase in RPM. "


15hp mallin suositeltu täyskaasualue on 5500-7000, kun se 9,9 hp koneella on 5000-6000. Lisäteho tulee siis vain lisäkierrosten myötä, ts. esimerkiksi jyrkempää potkuria ei kannata vaihtaa, jos koneen muuntaa 15hp versioksi. Minulla on -90 9,9hp ja se on sen verran näppärä, hyvätapainen ja mukava kone, että en ajatellut koskea siihen mitenkään, vaikka pieni lisäteho (tuskin kuitenkaan oikeasti 5hv) olisikin mukava. Kipparin testissä tuosta 9,9hp mallistakin nimittäin mitattiin 13.7 hp...

Vermeet muuten ihan samat molemmissa mootoreissa mutta 15hp avarampi pakoputki!! Mutta mistä minä saan tuollaiseen mootoriin ehyen kampiakselin?? :))