Evinrude 235 V6

[BigwayNZ]

There is a motor for auction and it sounds very very tempting. however there is something wrong with it. It has low pressure in one cylinder. The guy is telling me that the ring needs to be replaeced and he had a quote for $1500.

It is a 1988. same as my johnson 175 1988.

First of all can someone answer me why johnson and evinrude look exactly the like but have different naes?


Now, back to this post, Could whatever is wrong with this motor be fixed by using any parts from my johnson '175' in this '235'?

I know different size etc but i have no clue so i am asking.


If so then this would eb a good buy.

Going what he has said here what would you guys say it would cost to fix and does the problem mean it needs a complete rebuild?


Any advice here in detail so i can 'learn' would be greatly appreciated.

here is the motor.http://cgi.ebay.com.au/outboard-evinrude-235-hp-v6_W0QQitemZ120361130878QQcmdZViewItemQQptZAU_Boat_Parts_Accessories?hash=item120361130878&_trksid=p3286.c0.m14&_trkparms=66:2|65:1|39:1|240:1318

 

[tashasdaddy]

Re: Evinrude 235 V6

there is absolutely no way to tell what is causing the low compression, with out removing the cylinder head, could be as simple as a head gasket. or need a total rebuild.

 

[Faztbullet]

Re: Evinrude 235 V6

I agree, That motor is also a 1984 not a 1988 and its in the "land down under"
Australia

 

[BigwayNZ]

Re: Evinrude 235 V6

Whats the problem with it being in Australia?

 

[Faztbullet]

Re: Evinrude 235 V6

Nothing if you live "down under". If you live in the states the shipping would likely make it not worth buying. If you have the bubble back 175 you already have a 2.6 liter engine. With a few mod's you could have a easy 225hp engine.

 

[BigwayNZ]

Re: Evinrude 235 V6

Not sure what you mean by bubble back and what mods would these be? Please explain.
Yes, I do live in Australia.

 

[BigwayNZ]

Re: Evinrude 235 V6

It is the V6 VRo 175.
Does that make it a bubbleback?
Also, what is the difference with the GT175 and what is crossflow?

Thanks for all the help.

 

[Faztbullet]

Re: Evinrude 235 V6

The basic mod's are to clean up all the ports. The next mod is to install a set of high performance reeds and filler blocks,cleaning up the transfer port area, cut a scallop in transfer port,and install a set of 235 carbs (1 3/8 bores) See the attached pictures and post to answer your other questions

 

[emdsapmgr]

Re: Evinrude 235 V6

The basic parts between the 175 and 235 are identical and should interchange. They are both big bore blocks with 1 3/8" carbs. The 235 was crank rated, the 175 is a propshaft rated engine. Same thing. The 235 was a very optimistic rating at the time and the 175 is a conservative propshaft rating. The 175 probably puts out more like 193. The 235 has the intake filler blocks and slightly different heads, so will make more hp than the 175-however you rate it. If it has a bad hole, it is not worth much, unless you by it for parts.

 

[BigwayNZ]

Re: Evinrude 235 V6

The basic parts between the 175 and 235 are identical and should interchange. They are both big bore blocks with 1 3/8" carbs. The 235 was crank rated, the 175 is a propshaft rated engine. Same thing. The 235 was a very optimistic rating at the time and the 175 is a conservative propshaft rating. The 175 probably puts out more like 193. The 235 has the intake filler blocks and slightly different heads, so will make more hp than the 175-however you rate it. If it has a bad hole, it is not worth much, unless you by it for parts.

Thank you. That is what I would call a straight to the point informative answer.

Appreciated.

 

[QSS]

Re: Evinrude 235 V6

what is the item number on ebay as i can,t seem to find the ad.

 

[BigwayNZ]

Re: Evinrude 235 V6

what is the item number on ebay as i can,t seem to find the ad.

Ebay.com.AU

item number 120361130878

 

[hitechredneck]

Re: Evinrude 235 V6

I know this may be a long shot since this thread is kinda old, but one never knows unless they ask, here goes it.

I apologize in advance for the length of this post.

I have a similar motor as BigwayNZ.
I have a '89 GT175 that I rebuilt a few years ago after I won the boat in a bet. The motor had a melted #6 piston. I cured that problem and have run it since 2001, it runs strong with the mods I've already done.
But I want a little more if I can.

When I rebuilt the motor I performed the normal 2-stroke mods I've learned from racing and wrenching as a motorcycle, ATV, PWC tech for 35-plus years in the bike business and I applied my knowledge from what I learned from drag racing as a crew chef on a top alcohol dragster racing team.

Faztbullet, you provided some very good diagrams on this topic. Thanks for that!

These questions are initially directed at you Faztbullet, but anyone with reasonable advice please reply & will be very much appreciated.

My questions:
Q #1. Do ya'll, have any specs for the scallop cut in the transfer port area?

Al Stoker advised me earlier this year that too much porting or improper porting can kill these motors.
I know what improper porting can & will do, that's a given.
I was never given any specs to go by either.

Q #2. What is considered too much for these mtrs?

Q #3. Do ya'll, have any porting specs for these mtrs?
Q #4. How about any other modification recommendations?

Hers is my next plan of attack, it includes using a block I bought on eBay, an '85 Evinrude 235HP V6, model: E235TXCOR.
I've got an extra set of .030" oversized Wiseco piston sets.
These pistons have Teflon anti-friction coated skirts & heat barrier coating on top of the domes for the initial build.

I want to do some other mods to get a little more from this old school motor if I can.

I've also purchased (what I've been told) are the better performing heads for these motors, part #'s 0325638 & 0325639.
I'll shave the heads .030" to bump compression a little more.

I'm currently looking for the megaphone part #: 0329789
I've got the reed fillers, Boyesen reeds, 1-3/8 carbs, an assortment of jets, and advanced technical skills.
I just need some specs to go by, especially from someone with more marine outboard experience.

Q #5. Do ya'll think the megaphone is worth the extra trouble.
To me, it's just a little extra labor, since I'm doing it, it's free labor, just another project.

Q #6. Any other suggestions?

Thanks in advance to all that reply.

HTRN

 

[Dhadley]

Re: Evinrude 235 V6

You are on the right track right up until you talked about cutting the heads. Always keep in mind this is a crossflow not a looper or a 4 stroke. If memeory serves me, and it may not, those are the GT/XP heads and are very good as is. One more point to think about is that there is a lot of untapped power in the intake manifold.

The earlier mention of the power output is dead on. It's very easy to add about 40 hp to the 160 cid block but after that it gets real tricky. Even doing everything you talked about that motor will not have the power of a stock V6 looper. You could convert it to a CCC style but it's expensive even if you could find the parts. And a modified looper will still make a lot more power.

 

[emdsapmgr]

Re: Evinrude 235 V6

As Dhaley said-be careful cutting those 638/638 heads. I had a pair of brand new heads cut slightly. When I trial fit them by hand, they hit the domes on the pistons. Now they are junk unless I cut some of the scallops out of the head by hand to clear the domes of the pistons.

 

[hitechredneck]

Re: Evinrude 235 V6

You are on the right track right up until you talked about cutting the heads. Always keep in mind this is a crossflow not a looper or a 4 stroke. If memeory serves me, and it may not, those are the GT/XP heads and are very good as is. One more point to think about is that there is a lot of untapped power in the intake manifold.

The earlier mention of the power output is dead on. It's very easy to add about 40 hp to the 160 cid block but after that it gets real tricky. Even doing everything you talked about that motor will not have the power of a stock V6 looper. You could convert it to a CCC style but it's expensive even if you could find the parts. And a modified looper will still make a lot more power.

Howdy Dhadley, thanks for your input.

I've got some specs that should work on the heads, how much to mill & chamber CC's. I've got a few spares so I'm good there if I scrap a set, I'll be careful as long as my machinist does a good job I should be fine there.

What do ya mean about untapped power in the intake manifold?
What all do you suggest? Any specs?

It's late again & I can't think straight, as if I can normally, that said, what is CCC style?
Do ya mean closed course circuit?
Like I said, I can't think straight right now, long hours at work if ya know what I mean.

I kinda know what you mean about the late model motors and I don't expect to achieve the power from this old style motor like I could with a modded newer model, but I can surprise some other boaters as I already have with my current setup.

Since I'm gonna freshin' up this motor anyway & I've got some addl' parts for another short block build, I want to get as much as I can out of this setup if I can without it requiring racing fuel.
I also want it to be fairly dependable, just modified or more modified.

Although it would be nice to get into a fuel injected late model motor, I can't justify spending 20k plus for a new motor, at least not at the present time, maybe after we recover from Obama in the next 1000 years. LOL

I can afford the cheap labor for my mechanic, I work pretty cheap for myself and for most of my family & friends. LOL

I can buy another rotating assy fairly cheap, along with most of the other components that'll build up a long block.
I'll install my electronics & fuel system when I swap powerheads, unless I find most everything on the cheap.
I'll prolly do all of this during winter, or over the next year, so times not an issue.

I'll appreciate any suggestions.

Thanks again,
hitechredneck

 

[hitechredneck]

Re: Evinrude 235 V6

Howdy emdsapmgr & thanks for the reply.

Would you by chance still have those heads?

 

[Dhadley]

Re: Evinrude 235 V6

Try this - cut your heads and do all the clearances (we'll assume Al told you how to check clearances). Run the boat with the right octane according to your head specs. Then run it again with a set of stock XP/GT heads with 87 octane and let us know what you think.

The old CCC motors were a race motor OMC had back in the day. C in Roman numerals is 100 so the CCC motors were 300 hp.

 

[Faztbullet]

Re: Evinrude 235 V6

What type of boat are you putting this on?

 

[hitechredneck]

Re: Evinrude 235 V6

Dhadley, ya mentioned some mods for the intake, ya mind sharing your thoughts?