88 outboard Carbs. With 115 carbs

[felkerjohn]

What is the difference between a 115 and 88. Is it carbs only?

 

[bob johnson]

Re: 88 outboard Carbs. With 115 carbs

simple question.... simple answer........no


BOB

 

[Faztbullet]

Re: 88 outboard Carbs. With 115 carbs

As Bob posted...No. The 88 hp and 90 are the same, the 115 has different size intake and exhaust ports.

Hey Bob ya got that motor smokin yet??? I sent ya some snow ...free of charge

 

[emdsapmgr]

Re: 88 outboard Carbs. With 115 carbs

The 115 carbs are have larger throats and pass more fuel/air. The 115 has different heads. The 115 has the special bubble back exhaust system, machined at the factory. Likely the 115 has different porting, machined at the factory.

 

[levi_tsk]

Re: 88 outboard Carbs. With 115 carbs

so whats the difference btwn the the 115 and a 140 ? even further enlarged ports and even bigger carbs and jets?

 

[bob johnson]

Re: 88 outboard Carbs. With 115 carbs

As Bob posted...No. The 88 hp and 90 are the same, the 115 has different size intake and exhaust ports.

Hey Bob ya got that motor smokin yet??? I sent ya some snow ...free of charge

and to think I liked you!!!!!!!!!

from now on, just send me stuff I pay for!!!! unless you have a free recitfier-regulator!!!!!!!!!!!!!!! ha ha ha gonna need one soon

it is zero degrees to day and i am taking my boat out tomorrow on long island sound!!!!!!!!!!! ha ha ha thats extreme boating!!!

bob

 

[Chinewalker]

Re: 88 outboard Carbs. With 115 carbs

so whats the difference btwn the the 115 and a 140 ? even further enlarged ports and even bigger carbs and jets?

Depends on the years you're talking about....

The 1984 & prior 140 crossflow is basically the same motor as the 1985 & up 115hp crossflow - they re-rated the motors at the prop starting in 1985. The 1984 & prior 115 had a flat-back exhaust, with the same porting as the 140, which had the bubbleback. The 1985 & up 115 had the big ports & bubbleback of the earlier 140...
The 1984 & prior 115 became the later 100 (big ports, flat back).

 

[Faztbullet]

Re: 88 outboard Carbs. With 115 carbs

so whats the difference btwn the the 115 and a 140 ? even further enlarged ports and even bigger carbs and jets?

Porting area, carbs, intake stuffers, heads.. The only heads that are different(chamber wise) on the 3.5 bore crossflow are the pre 1980 140's. The later model (85 and up) heads fit 85-140 hp's and are a lower compression due to cast-in "filler" eyebrow in head is smaller(more area). The 1981-85 heads have about 10 psi more running compression and also fit 90-140hp's. Other differences in heads and blocks are "boss" casting differences for ignition components mounting, transfer port covers, intake manifold, carb throat size. There is about 5 different porting "maps" for V-4 blocks, that why sleeves are sold without ports so they can be matched to block...

 

[Chinewalker]

Re: 88 outboard Carbs. With 115 carbs

Hey FB - either of these guys look familiar?