HP rating

[88 Capri 1950]

I bought a 1988 Bayliner Capri 1950 with a Chevy 305 I/O, OMC drive. I am trying to find out what the HP rating was for that engine? I have had to do a little work to get it ready for the water. A new carburetor, exhaust manifolds, prop shaft and both bellows. The previous owner had totally redone the interior and it looks great...the biggest reason I bought it. I will post some pics when I get it back.

 

[roscoe]

Re: HP rating

Welcome to iboats.
Carbed, right?
Should be about 185-190 hp.

 

[444]

Re: HP rating

Just go an look up to see what a comparable 305 in a chevy truck would have made for power in that year. Probably around 150hp with near 200ft-lbs torq. Boat i/o v8's tend to be rated very generously compared to their automotive counterparts while the marine versions tend to have a similarly or more restrictive intake/exhaust system.

 

[88 Capri 1950]

Re: HP rating

Thanks for the replys. The engine is carbureted, Rochester Quad. I was guessing around 200 so I wasn't off too bad.

 

[smokeonthewater]

Re: HP rating

the mercruiser 305 in my 1978 arrowglass with a 2 barrel was 198 hp
the marine engines generally make more power than car engines because they have higher compression ratios....

some mercruiser 305's with 4 barrels were rated at 230 hp

I would expect omc to be the same or very close

 

[roscoe]

Re: HP rating

Seen the paper work on a 1992 model 1950 with a 5L, it was rated at 190.

Also checked on my 1988 Safari van 4.3l-- 180hp, and my 1987 GMC van 5.0 190 hp.

 

[Chris1956]

Re: HP rating

I thought those 305s were 220HP, but it did vary some over the years. My Chevy 4.3L V6 w/ 4bbl carb has 205HP.

 

[88 Capri 1950]

Re: HP rating

The main reason for asking is for insurance purposes. I was not too concerned with what it was until they asked me.

 

[Chris1956]

Re: HP rating

That surprises me since a 305 is one of the most popular motors ever made. The power is pretty standard. A 19 footer could easily have a V8. Was your Capri ever avail with a V8? If not, that might be the source of the question.

 

[sw33ttooth]

Re: HP rating

naw i was asked the same thing when i went to "try" and get insurence first thing they wanted to know was how big 2nd how much hp does engine have and 3rd was year, i keep getting turned down when i tell them the year altho 91 doesnt sound old apparently they dont want my money? also i dont even know the hp on my 5.8l omc i just told him it was 260?, i think that was as high as they insured for.

 

[NYBo]

Re: HP rating

Welcome to iboats!

From the 1988 Capri owner's manual:

230 HP
14 1/2 x 19 prop
4600 maximum RPM

 

[88 Capri 1950]

Re: HP rating

I have the owners manual for my boat, it doesn't have any HP ratings. Tanks for the info.

 

[444]

Re: HP rating

the marine engines generally make more power than car engines because they have higher compression ratios....

No they don't. They typically have the same crappy smogger pistons as a comparable year automotive production engine. The difference is boat engines appear to be rated at sae gross where 72+ automotive engines are rated sae net.

 

[roscoe]

Re: HP rating

The 305 is a v-8.

 

[88 Capri 1950]

Re: HP rating

No they don't. They typically have the same crappy smogger pistons as a comparable year automotive production engine. The difference is boat engines appear to be rated at sae gross where 72+ automotive engines are rated sae net.

I thought marine engines were made with heavy duty internal parts since they run at higher RPMs than automotive engines?

 

[Chris1956]

Re: HP rating

No, Most have the same internal parts as cars and trucks, except for the camshaft. The cam is a marine grind for better low end power, similar to a truck cam.

You can get Marine V8s with 4 bolt main bearings in big block motors, but I would assume there is also a non-marine use for these

 

[smokeonthewater]

Re: HP rating

cams are specific to application and at least in the older chevy v8 marine engines I've been into the pistons were flat tops.... I did find a 305 with dish pistons in it once but most have been 350's (260hp) and have had flat tops

either way... for the o/p I'd say you can comfortably tell your ins agent 230 hp