engine swap from 6cyl to 4 cyl

[boaterinsd]

i have the 1973 aq170 now with a bad head. I am able to get a 70's aq130 for nothing but the time it takes to remove it. Now is the ratio in the outdrive gonna need to be switched or can i do a prop change to make it work.

 

[Don S]

Re: engine swap from 6cyl to 4 cyl

Yes, you will need to change the gear ratio.

 

[PiratePast40]

Re: engine swap from 6cyl to 4 cyl

I am able to get a 70's aq130 for nothing but the time it takes to remove it.

Cracked heads are common so make sure you take the time to check out the engine. At the very least, pulling the head to inspect and lap the valves is a good idea. Rebuild parts like rings, valves, cam and bearings are available but they are dependant on the serial number of the engine and it may take a bit of research. I'm just finishing up on a rebuild so don't hesitate to ask questions.

You can swap out outdrive lower ends for the gear ratio change but reshimming may be required.

 

[boaterinsd]

Re: engine swap from 6cyl to 4 cyl

ok, so your boat with the 4 cyl is how big and have you had it running before? Since mine was always not right i believe it should be fine since its an older boat anyway, right. Has anyone got a good running 4 cyl aq130 in there boat? And if so what is the performance you get with it?

 

[sqbtr]

Re: engine swap from 6cyl to 4 cyl

I run a 130 in a 17.5 foot boat, 34 mph gps is max

 

[wellcraft19]

Re: engine swap from 6cyl to 4 cyl

You might want to follow this thread http://forums.iboats.com/showthread.php?t=503981 for great ideas (a lot of work), but I'm encouraged/impressed by the progress.