150/175 bore stroke?

[sledmonster]

Anybody, im just trying to remember .

 

[Dhadley]

Re: 150/175 bore stroke?

Yep, I remember all of them. Crossflow, big bore crossflow, 60* loopers - all of them. Which ones are you looking for?

 

[sledmonster]

Re: 150/175 bore stroke?

Duh sorry,

I have a 83 crossflow with some confusing makings could be a 150 or 175 just wondering stroke?

 

[sledmonster]

Re: 150/175 bore stroke?

bump

 

[Dhadley]

Re: 150/175 bore stroke?

The 150 and 175 crossflows in 83 were both 3.500" (std bore). Both used the same block, crank, rods & pistons.

 

[sledmonster]

Re: 150/175 bore stroke?

Any idea how they had different horsepower?

Thanks

 

[Dhadley]

Re: 150/175 bore stroke?

There are some carb differences but on most pleasure boats you'd be hard pressed to tell the difference. The NMMA has a 10% rule about advertised horsepower. If the 150 is a tad more and the 175 is a tad less.....

Or if the 175 is rated at a higher rpm.............

You get the picture.

 

[Dhadley]

Re: 150/175 bore stroke?

In fact the 200 crossflow used the same block casting but the port timing was different. The 1978 & 79 235 (small bore) had the same crank, rods, pistons, gear ratio etc but used a "tuned exhaust", different heads and carbs. Remember, these were all powerhead rated motors. Even the big bore 235 in 1980 can't hold a candle to the 60* 150's that came out in 91.