HP / Cid ? CYL ?

[starsnstripers]

Have a 91 3.0 which is 181 CID 135 hp, Have an older early 80s Merc 4cyl says 140 on the valve cover and an older OMC says 120 on the valve cover. My ? is Are the second two engines the HP or The CID ? If it's HP Whats the CID on them? is the 140 like a 3.1 or 185+/_ CID? or? thanks

 

[dubs283]

Re: HP / Cid ? CYL ?

the 140 and the 120 are both hp designations

some of the older GM 4cyl of that style are actually 2.5L

3.0L = 181 cid

2.5L = 155 cid

 

[starsnstripers]

Re: HP / Cid ? CYL ?

Thanks Dubs, i thought so. do you know the CID on the 140 / 120 ?

 

[dubs283]

Re: HP / Cid ? CYL ?

the 140 is 181/3.0L

the 120 is 155/2.5L

 

[starsnstripers]

Re: HP / Cid ? CYL ?

when i looked up my specs on the 91 3.0 it said 135hp 181cid so the older 140 hp must be a bit more cid, no?

 

[dubs283]

Re: HP / Cid ? CYL ?

no, its probably carb/ignition that accounts for the extra hp

 

[starsnstripers]

Re: HP / Cid ? CYL ?

I see, yeah minor really. Thanks for the info Dubs. I have the ser and model #s of the OMC drive and engine posted in the OMC section to find out the year if you have any info on that, thanks.

 

[Bondo]

Re: HP / Cid ? CYL ?

Have a 91 3.0 which is 181 CID 135 hp, Have an older early 80s Merc 4cyl says 140 on the valve cover and an older OMC says 120 on the valve cover. My ? is Are the second two engines the HP or The CID ? If it's HP Whats the CID on them? is the 140 like a 3.1 or 185+/_ CID? or? thanks

Ayuh,... Howdy SS,...
The 3.0l motor is, 'n has always been a 181" cid motor since it's begining...
The various Hp outputs are mostly marketing, though they've used several different heads, manifolds, 'n carbs...
It's been tagged as a 130hp, 135hp, 'n of course 140hp,....
Still all the Same motor...

The most reliable way to tell the difference between the 3.0l, 'n the 2.5l, 153" cid is,...
The 3.0l has a harmonic balancer on it's snout...
The 2.5l has Just a pulley, No balancer...

The 2.5l, 153" cid motors We see in boats, should not be confused with the 2.5l used in automobiles,...
The 2.5l used in autos is the Pontiac bred motor, the Iron Duke, which is 151 cid, 'n Very different in block design...
The 2.5l, 153" cid motors have been tagged as 115hp, or 120hp, again, the same motors...

Hope this Helps,...

 

[Don S]

Re: HP / Cid ? CYL ?

I checked your engine serial number, 9902420, if that last 0 is actually a C, it would make it a 1980 120 (153 cu in).

Here is a list of all the 120's with the 242 series.

.

 

[starsnstripers]

Re: HP / Cid ? CYL ?

Thankyou Don and Bondo that clears it up.

 

[starsnstripers]

Re: HP / Cid ? CYL ?

Don, you got the #S from the OMC thread i see, could you figure out the Drive #s Stringer Ser# W171675 Mod# 674487 It was mated up to the 1980 120. I was wondering if it was a 1980 also, thankyou.