90 degree or 60 degree...or...

[bob johnson]

corss flow or looper...

is there a way to know?

do you really have to try and figure the angle of the block?

did they make one during certain years and another the other years?

did they make say a 90 HP crossflow the same year they made a 60 degree looper in 90 hp?

what is a 1987 Evinrude 88 spl?

thanks

bob

 

[jhebert]

Re: 90 degree or 60 degree...or...

A rough taxonomy:

OMC

1958 Cross-flow V4
1968 Loop-charge Inline 3
1975 Cross-flow V6
1985 Loop-charge V4 90-degree
1985 Loop-charge V8 90-degree
1986 Loop-charge V6 90-degree
1991 Loop-charge V6 60-degree

 

[DGartzos]

Re: 90 degree or 60 degree...or...

Cross flow motors have something like a wall barrier on top of pistons, to prevent incoming mixture to flow directly out the exhaust port when piston is at bottom and all ports open.

Loopers have a generally flat top on pistons, but intake flutes shape is so as to direct incoming mixture toward the top of the chamber, so mixture loops from intake ports to top and then downward in chamber.

 

[emdsapmgr]

Re: 90 degree or 60 degree...or...

The OMC designation of SPL was to indicate a reduced cost version of the higher hp engine. The 88 was actually a 90 with some items deleted. The 48 was really a 50, etc. To hold the cost down on these cheaper models, OMC would eliminate options like the VRO oiling system, or power trim-usually these engines had just a voltage rectifier and not a combination rectifier/regulator. Other than that, it is the same engine.

 

[bob johnson]

Re: 90 degree or 60 degree...or...

I have seen diagrams of the cross flow and looper basics. I thought they made the crossflow and the looper of the same HP in the same year!!!

that is why i asked how can you tell... there is nothing in the model number to specify it, is there?

I also know about the spl designation...I thought it was maily for commercial use..


I am still wondering about wether they made loopers and crossflows close to the same years or even in the same years....and then WHY?

bob

 

[Chris1956]

Re: 90 degree or 60 degree...or...

Bob, A 90 degree block is easy to spot. The engine cover will be roughly wedge shaped, wide in the rear. The 60* motors have a rectangular engine cover.
The Crossflow motors will have transfer covers on the outside of the cylinder banks. Loopers do not.

 

[bob johnson]

Re: 90 degree or 60 degree...or...

ok then this 1988 88 spl looks like a 90 degree motor... the cover is roughly tirangular...my 1997 90 hp has a more rectangle cover..

the 88 spl also has a casting that connets both sides of the block down on the bottom and it also has a hose coming off both side, as if it was a water passage

can you have a 90 degree looper and a 60 degree crossover??

ie is there actually 4 possible combinations? or are all 90 degree motors cross overs?

thanks bob

 

[Chris1956]

Re: 90 degree or 60 degree...or...

Bob, All 60* motors are loop charged. The 90* motors had both loop charged and cross flow. The 90* motors were first made in 1958. They were crossflow.

 

[bob johnson]

Re: 90 degree or 60 degree...or...

is one more desrieable and or reliable that the other?

I have to pick a mator and both are in the mix.

I have a 1997 OIS 90 hp 60 degree that needs a rebuild( knock)

I have a line on a clean 1988 88 spl 90 degree...

almost 10 years older

I already have my buddies take off 1987 88spl with a blown cylinder for a parts motor maybe

and am going to look at a 1999 90 hp 6o degree motor...but i suspect the line of information the seller has been giving me

if i knew more about the qualities of each....It could help my choice

the mechanic I have told me the OIS has had issues.....but he complains about everything!!!!!

anyone?

bob

 

[kenmyfam]

Re: 90 degree or 60 degree...or...

10 years newer does not necessarily mean 10 years better. There are many 20 year plus motors out there that have been well maintained and are in better condition than many 3 year old neglected and thrashed motors. Do the basic checks if you can before buying. Compression, spark, water flow etc and try to get a water test or at least fired up on muffs. Anyone that will fire it up without muffs is someone to stay clear of.

 

[Chris1956]

Re: 90 degree or 60 degree...or...

The '99 60* motor has the latest OMS gas/oil mixer, plus the better engine warning system, compared to the '88 motor. If both are in comparable shape, and the price is close, I would buy the newer motor.

There will also be a power advantage on the '99 60* motor.