any thoughts on increasing power? 2000 115hp

[jmcleod]

I have a 2000 115hp V4 Johnson. I was told I could swap out the carb(s) and the exhaust with the ones from a 130hp or 140hp and basically add 20hp to the engine. My understanding is the V4's are the same with basic restrictions in the intake/exhaust that account for the hp differences.

Is there any validity to his?

thanks!

Jon

 

[Dhadley]

Re: any thoughts on increasing power? 2000 115hp

The carbs from a 90 degree 120 /130 / 135 / 140 looper will not fit on your 60 degree 115. Neither will the carbs from a 140 crossflow.

Instead of throwing fuel at it, lets start by laying out the baseline of what you have and where you're at now.

 

[jmcleod]

Re: any thoughts on increasing power? 2000 115hp

Dhadley,
Thanks for the reply.

Boat is a 2000 Seafox 195 BayFisher. The 115 Johnson sits on a Bob's Jackplate. Currently the boat tops out at 38mph (1/2 tank fuel and myself on board). I am not sure what the fuel consumption is at this point, but I have a Floscan to install later this week to help answer that question.

My plans are to add a T-top and some extra #'s with a modified center console (cooler and storage for cast nets and such). Currently, the boat is fine with 1 or 2 people on it, but when I have 4, the motor labors a bit more. My goals are to increase speed and maximize fuel economy. Prop is 13.75x15 aluminum, and I reach top speed at 4700 rpm and about 75% throttle. If I went to a 17" prop, I am figuring I would lose too much from the hole shot, and a 4-blade wouldn't get me the top end.

Thanks for the help!

Jon

 

[bob johnson]

Re: any thoughts on increasing power? 2000 115hp

Dhadley,
Thanks for the reply.

Boat is a 2000 Seafox 195 BayFisher. The 115 Johnson sits on a Bob's Jackplate. Currently the boat tops out at 38mph (1/2 tank fuel and myself on board). I am not sure what the fuel consumption is at this point, but I have a Floscan to install later this week to help answer that question.

My plans are to add a T-top and some extra #'s with a modified center console (cooler and storage for cast nets and such). Currently, the boat is fine with 1 or 2 people on it, but when I have 4, the motor labors a bit more. My goals are to increase speed and maximize fuel economy. Prop is 13.75x15 aluminum, and I reach top speed at 4700 rpm and about 75% throttle. If I went to a 17" prop, I am figuring I would lose too much from the hole shot, and a 4-blade wouldn't get me the top end.

Thanks for the help!

Jon

well I wont use one...but i DID use one!!!

if you went with a SS prop in the same configurations I bet youd pick up 3 mph...and get into the 5,000's in rpm...

I have always heard that those 60 degree motors like MORE rpm, rather than less...and many recomend to run them at 6000 rpm

I have that prop( ss 13-3/4" X 15) and I put it on my 95 115 ocean runner and it took me from 5400 rpms and 36 mph out of a 14X 17 aluminum to 6200 rpms at 39 mph!!

but since i run shallow and banged my prop and damaged my lower unit, ill never use SS again...props are always cheaper and way way way faster to get going again, than a lower unit repair!!!!!!!!!!!!!

I like the performance of the SS and knew that i wouldnt run it at 6200 normally but once i loaded my boat it would fall back into a safer range....and it did!!! onc eloaded for use the rpms fell back to 5800 rpms !!!!

and forget about going to the 17 in aluminum...youll lose even more rpms!!!!

thats the wrong way to go




good luck

bob