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Opinions needed Crossflow vs Loop Charged

bill_w

bill_w

Advanced Contributor
I'm repowering my 16' Sidewinder. The 89 110 on it suffered a major meltdown. I've got a choice of either a 115 Crossflow or a 130 Loop charged. First of all, I'm not too familiar with larger engines. Can someone explain in laymans terms the differences? Is one superior to the other? Both of these engines are early 90's vintage, I'm not sure yet of the exact years. I don't tow skiers, and at most I have one passenger in the boat. I'm looking for speed most of all.

Any thoughts/opinions would be most welcomed, as would alternative choices or options.

Thanks in advance
Bill Wilson
 
Racerone
I'm not sure yet. I haven't torn it down, but I think its got either rod or crank bearing issues. It was a used powerhead from Florida, and it has a re-built gearcase and a different midsection. Don't ask me what year anything is for sure, I didn't do the rebuilding, the previous owner did. Depending on what I can find to replace it, it may be kept for parts, or sold. Got anything big for sale??
 
The cross flow is the more traditional approach to charging the cylinder. The charge comes in one side, hits the piston deflector and is directed up, and displaces the exhaust from one side to the other. A Loop charged engine doesn't utilize a deflector. The charge enteres through a couple different ports around the cylinder. The fuel streams combine to scavenge the cylinder in a circular or "loop" pattern.

As far a characteristics, the cross flow will typically idle smoother and be a bit more predictable. The 130 will be the 2.0L "looper" which is a bit heavier than the 1.7L "eagle" introduced in 1995. The performance of the 2.0 will be substantially stronger than the cross flow. From a reliability perspective, all the OMC V-4's are outstanding except for some of the very early loopers with high-ring pistons. Most of them are probably gone by now.
 
I think the 130 looper is a 95..good or bad? I know they are heavier, but only by about 50 pounds I think. Not an issue for me, I can shift the battery foward to compensate, and keep the bow tank full. The boat performs better now with the tank full. The 115 I thnk is an earlier model, about a 90 or so.
 
dcramer said:
The cross flow is the more traditional approach to charging the cylinder. The charge comes in one side, hits the piston deflector and is directed up, and displaces the exhaust from one side to the other. A Loop charged engine doesn't utilize a deflector. The charge enteres through a couple different ports around the cylinder. The fuel streams combine to scavenge the cylinder in a circular or "loop" pattern.

As far a characteristics, the cross flow will typically idle smoother and be a bit more predictable. The 130 will be the 2.0L "looper" which is a bit heavier than the 1.7L "eagle" introduced in 1995. The performance of the 2.0 will be substantially stronger than the cross flow. From a reliability perspective, all the OMC V-4's are outstanding except for some of the very early loopers with high-ring pistons. Most of them are probably gone by now.
Click to expand...
 
I have a 1996 Evinrude 150 Loop charged engine and it runs starts good idles good but when in gear at Full Throttle it misses what could be the problem I have new spark plugs have cleaned all six carburetors really well in fact they was completely rebuilt so could this be an electrical problem like timing of some sort or a gas flow problem at Full Throttle all the carburetors are completely open they all are the same they all close the same what could this be maybe Looper engines of this year have a same problem or what I'm asking for help here thanks for listening to my problem
 
tcspidey said:
I have a 1996 Evinrude 150 Loop charged engine and it runs starts good idles good but when in gear at Full Throttle it misses what could be the problem I have new spark plugs have cleaned all six carburetors really well in fact they was completely rebuilt so could this be an electrical problem like timing of some sort or a gas flow problem at Full Throttle all the carburetors are completely open they all are the same they all close the same what could this be maybe Looper engines of this year have a same problem or what I'm asking for help here thanks for listening to my problem
Click to expand...
Fuel starvation at WOT will not present itself as a misfire. If you are fuel starved you'll either bog down or not be able to reach max RPM. I have the exact same engine and had an issue where I could reach about 4500RPM but had plenty of throttle left. The engine never misfired but just couldn't get to max 5500 RPM. A complete run through the fuel system with float chamber and fuel pump replacement, along with carb rebuilds fixed my issue.

To echo Racerone, check your fuel pump and make sure you're aren't over heating. I like to run a fuel pressure gauge to continually verify I'm getting good water flow.

What brand are your spark plugs? Be certain to use ONLY Champion QL78YC in this OIS2000 equipped engine. Champion Spark Plug Guide These systems do not like cross referenced plugs. Lots of automotive shops will gladly sell you NGK plugs that are supposedly compatible but you really should only use Champions.

Check the integrity of your coils plug wires, and boots. You are possibly getting arcing to the block and it's showing up under heavy load. If the issue isn't overheat related or failed coils/wires then you need to start looking at the optical eye, stator, and rectifier.

KJ
 
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