90hp evinrude

[PACERll]

I own a 90hp evinrude and this being my first rude need some info on this motor. The serial number is 03530467 and the model number is E90TLERC. What I need to know is this a looper or a crossflow. All I can tell right now is that its not the bubbleback design it is the flatback design. Also can someone tell me is this the model that is the 60degree block or is it the 90 degree block. I am in the process of trying to get this info as I want to extract some more ponies outta this motor but want to make sure I get the right parts from the get go. Thanks in advance.

 

[OBJ]

Re: 90hp evinrude

Crossflow, 90* block.<br /><br />Crossflows will have the bypass covers on them where loopers don't.<br /><br />90* blocks are much wider than the 60* blocks.<br /><br />60* blocks are mainly loopers.<br /><br />Bubble backs will be found on the 112's and 115's on this block for this year.<br /><br />Hope this helps

 

[PACERll]

Re: 90hp evinrude

Thank you very much for the reply. I am currently trying to extract some horsepower outta this engine without having to buy another motor. I purchased a tidecraft bassboat that is rated for 120hp but has a 90 on it. I plan on doing the necessary modifications to get more horsepower and save money. If I am correct all I have to do is change out the carbs tuner and the exhaust plate and resett the timing. If I am not correct I would appreciate it if you could point me in the right direction. By the way this has been one of the most informative boards and some of the best people that I have dealt with on the puter. Keep up the good work.

 

[Dave Abrahamson]

Re: 90hp evinrude

I think there is more to it than that. But I'm sure more knowledgeable folks will chime in here soon. Do a search on this site with "more power" in the search box and then check "subject only". You'll glean a lot of info there also.<br />For example: http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=029435#000000 <br />You must also make sure your setup is good from the get go. WOT rpm"S? Jackplate? Etc...<br /><br />Good Luck!<br /><br />Dave

 

[Dhadley]

Re: 90hp evinrude

There is more to it than that. Actually all the V4 crossflows have the same ignition timing. The 90 does have smaller ports. You can change to the 115-140 style port timing and area.

 

[SLEEPY1230]

Re: 90hp evinrude

I have the bubble and tuning blocks for a 140 that will give you more power if you jet it right.

 

[PACERll]

Re: 90hp evinrude

Ok back on the subject of getting some more out of this motor. Right now she is up to par as far as compression. Only a 3% variance between cylinders. Without getting into the block and changing pistons etc. what do ya'll think would be the most bang for the buck and what pieces do I need. Ya'lls help has gotten me along way so far and am hoping I can get upto around 120 or so ponies outta this mottor. Thanks in advance.

 

[Dhadley]

Re: 90hp evinrude

Whats the set up like now? Top rpm? How's the holeshot etc?

 

[emdsapmgr]

Re: 90hp evinrude

Your engine is a low-port engine and it's breathing will limit your ability to get up to the horsepower of the old 135, 140 engines. However, the addition of the 140 carbs, crankcase filler blocks and the 140 heads will certainly wake the engine up. While the larger carbs will bolt on, you will need to rejet for your engine. If you are happy with the current compression, go with the above bolt-on mods. These mods should get you close to your target H.P. If you want to get into removing the block and machining, you can add the bubble back exhaust and do some port work.

 

[PACERll]

Re: 90hp evinrude

The holeshot is acceptable for a tourney load. The boat is actually rated for a 120 and beleive it or not present setup allows me to run 48 GPS varified. WOT rpms are 5100rpms. I am also going to install a 4 inch jackplate to allow higher jacking of course and prop the motor accordinly. I want to get the hp up of course before I start the propping. Dont want to buy a prop and be limited because I bought one before the mods have been done. I am assuming after installing the heads,filler blocks and the carbs I am gonna have to richen up the jetting...correct???? Another question is on the exhaust part. On mercurys there is a small gain by allowing the exhaust to escape through the exhasut ports on the mid section. Does this also apply to the OMC motors as well and if it does what is the correct procedure to do this. LOL Plus it sounds cool. Thats the kid in me showing up. I have a prop man that will work up the correct prop for me and he is a artist at his work. He built me a small ear chopper and did the bama cut on it. Took my lil ole laser from running 67 GPS to 73 GPS. Good holeshot, awsome midrange and blazing topend for a 15 1/2ft laser with a 115. I have been told that a worked SRX will probably be the way to go. Keep the ideas and knowledge coming folks PLEASE. You guys are great.

 

[Dhadley]

Re: 90hp evinrude

At 5100 you're killing the motor by lugging it. We need to get the rpm up with the prop you have now. At this point dont worry about hp, you're not using everything thats available now. <br /><br />What pitch prop are you using? What kind of a hull is it?<br /><br />BTW -- the SRX props wont work on a V4 gearcase. They have too much diameter. They'll hit the AV plate.

 

[PACERll]

Re: 90hp evinrude

I was under the impression that these motors where to be propped to run at 5250 WOT. Right now I am using a worked 21p raker. Dont they make a SRX that fits the smaller V4 cases??? I was under the impession they are hard to find but supposed to be a sweet prop. Correct me if I am wrong. The hull is a tidecraft bassboat 16 1/2ftr. Ok now that we got the discussion going where do I need to prop this motor for topend WOT numbers 5500 like the bigger motors and what kinda prop u suggesting.?? Yhanks again you being MUCH help in getting this hull up and moving. Gonna put a 4inch jack on it this coming week so I know I will be able to run a little bigger prop and I know I will have to play with the setting of the jack(manual) so shoot me some more info on what you got on your mind. Thanks.

 

[PACERll]

Re: 90hp evinrude

Dhadley you still here??? Needing to know what ya think??

 

[Dhadley]

Re: 90hp evinrude

We need to know exactly what prop youre running. Rakers come in even numbers. SST's are in odd numbers. If you indeed have a Raker, thats great. They have a lot of lift but need a pretty good X dimension. Therefore the jackplate is an excellent idea. Stick with this prop, if its a Raker, for now.<br /><br />As for rpm, your target is 5800 with an average load. Anything less will shorten the life. More wont hurt anything.<br /><br />If I remember correctly that boat has a pad and a step, right?

 

[emdsapmgr]

Re: 90hp evinrude

I put a set of 135 carbs on a stock 85, with porting and the filler blocks. The 135 carbs had 69's, which were just slightly too rich. The 140 carbs will also likely flow too much fuel unless you port and do the bubble exhaust. The original 90 engine was rated to run between 4500 and 5500, with the hp rated at 5000. I think the 140's were rated up to 5750. The only over the hub prop OMC ever made for the V4 was the old silver streak. It was a 13 1/2 X 23. May have been 388884. They are still around. Only made in that pitch. Was the prop that started the V6 SRX props. They like light hulls. You see them on Ebay a couple of times a year.

 

[PACERll]

Re: 90hp evinrude

You are correct on the pad and the step Dadhley. I was told I had a raker but after doing some checking found it it is a stock 21p stainless. Came on the boat. Ok so I now need to look for a Raker if I am correct. I have heard that rakers are good on moderate weight hulls and as you stated dadhley they have lift which I know I need because I still have to much wetted surface. After installing the 4"jack what prop pitch should I look for to try first. I am assuming a 20 or a 22 should get me close for testing. Am I correct on this?

 

[Dhadley]

Re: 90hp evinrude

Yes, I'd guess we'll be looking for something in the 20" range. A Turbo Lightning Jr has a lot of lift also. I have some 18" Lightning Jr's but that won't do us any good -- I don't think. Come to think of it I have a 22 Raker for a V4 but that may be too much. Man, I'm not doing you any good at all this AM....<br /><br />Let's make one change at a time. Install the jackplate and test with the same prop. That ol' "one change at a time" deal. Lets see how the hull reacts to engine height. <br /><br />I'd expect to pick up some rpm -- slightly -- with just the set back and the same height using the same prop.

 

[PACERll]

Re: 90hp evinrude

I WANT THAT 22" RAKER PLEASE!!! If you are willing to sell it whether or not it does the trick on my rig I still want it. My personal email addy is wareagle50@hotmail.com Please in the subjec put Raker Prop and we will go from there on that issue. Will install the jackplate in a couple of days (by tuesday) and get back to ya after I install it. I am VERY SERIOUS bout that raker so please replay at my email addy on that issue.

 

[Dhadley]

Re: 90hp evinrude

I'll dig it out and get with you today.