1978 v6 crossflow150 prop selection

[jy118lfd]

I have a johnson 235 crossflow 1978 that lost compression on number 6. I am replacing the powerhead with a 150 used powerhead due to the fact that 235 was too much power on my 73 19-0 aquasport center consloe. The 235 was topped out at 5100 rpm at about 62 mph on flat water. I need the best prop to start with. I also would like to know what max rpm am I looking for? The 235 had a 14 1/4 22 stainless on it I have a 14 1/4 19 to try but will buy whatever I need to not carbon up my 150 Thanks in advance

 

[Dhadley]

Re: 1978 v6 crossflow150 prop selection

A 150 will not fit a 235 mid section unless you change the adaptor plate, tuner and inner exhaust can.<br /><br />Both those crossflows should be set up to 5800 rpm with an average load.<br /><br />Recheck your tach setting because the speed and prop selection is about right for that combo but the rpm's would have to be higher to get the speed.<br /><br />Good luck!

 

[jy118lfd]

Re: 1978 v6 crossflow150 prop selection

What are the parts I need for the swap Can you give me numbers so I can get them or do I have to change the midsection? I did not knoe this thanke for the info

 

[Dhadley]

Re: 1978 v6 crossflow150 prop selection

Adaptor plate 323553<br />Plate 322313<br />Megaphone 320870<br />The inner upper exhaust housing is the same.<br /><br />The cost of the parts is a concern but the old parts may not come out easily if its a saltwater motor. Dont spend any money until you see if your 235 parts come out.

 

[jy118lfd]

Re: 1978 v6 crossflow150 prop selection

thanks I found a mid section from Boat recyclers of wilmington If he cant get the parts out he will send the whole mid section