rebuilding 140, any tips?

tony120

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Nov 26, 2003
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first off, NO, there is no problem with my current 1985-140. I want to rebuild the 1989-140 that I have...for my winter project.my question is, what can be done to get a couple extra hp out of this motor.Dhadley or Joe Reeves, any input would be greatly appreciated.
 

Dhadley

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Feb 4, 2001
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Re: rebuilding 140, any tips?

The 89 will have more power than the 1985 from the added torque which comes from the additional .185" bore.<br /><br />You can get upwards of 200 hp from that design. Its all cubic dollars. My advise would be to rebuild it as its designed. <br /><br />Good luck!
 

tony120

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Re: rebuilding 140, any tips?

thanks for the reply,Dhadley but c'mon just a little something.telling me that its a 200hp motor is like saying "hey kid, want some candy?" can I raise the exaust ports a little..
 

fast_c_class

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Re: rebuilding 140, any tips?

if you want more responses and are serios about hp go to Www.screamandfly.com. several guys on that forum have experance with those loopers. search looper v4. i believe land and sea may still sell dual plug heads for that model but they are pricey
 

Dhadley

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Re: rebuilding 140, any tips?

First of all you have to know that your hull design will respond to hp and/or torque increases. Theres all kinds of things you can do but if the hull wont respond then its a waste of time and money. <br /><br />What hull are you going to use? What is the small bore motor doing now?
 

tony120

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Re: rebuilding 140, any tips?

my current 140 is on a 18' center console wellcraft. at 5800 im running 38.5 mph according to my gps with a 15-17 stainless prop. I often take several people out fishing and a little more power would help.
 

Dhadley

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Re: rebuilding 140, any tips?

Good boat but it doesnt respond well to small increases in torque. <br /><br />The advantage of running the 1985 gearcase is that you can run the large diameter props. The downside is that the gearcase itself is bigger and creates more drag. <br /><br />If I were building a V4 looper for that boat heres what I would do. I'd use the 89 block like you plan -- excellent choice. <br /><br />I'd update the cooling system to the 93 and newer style (eliminate the water control valve and related hoses). <br /><br />I'd use the latest carbs, throttle bodies and intake I could find (90 degree looper V6 stuff will work -- or V8 for that matter). <br /><br />I'd use the 93 and newer 90 degree looper V6 style pistons and light rods. You wont believe how much better it will idle.<br /><br />I'd set it up with a jackplate to take advantage of the additional prop diameter (providing your still going to use the big gearcase) and reduce drag.<br /><br />I wouldnt worry about porting. Its good as is for this project. <br /><br />I would break it in on the big bore (89) heads and then at least try running it on the small bore (85) heads to note any differences. The downside is that with small bore heads you have to run 93 octane fuel.<br /><br />Afetr that I'd concentrate on dialing it in and props. At this point we might even take a look at the hull and tweak that a bit.
 

tony120

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Re: rebuilding 140, any tips?

thanks a bunch.now, THATS , what I'm talking about.I will keep ya posted
 

tony120

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Re: rebuilding 140, any tips?

oh yea, what about 5 peddle vs 6 peddle reeds.im told my 85 has 5 and could use the manifold and reeds from my 89 that has 6 and would breath better.is that true?
 

Dhadley

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Re: rebuilding 140, any tips?

Thats a big debate. The 5's have a larger area, the 6's have more openings. The slanted intake vs the "top hat" design. Truthfully -- at under 7500 rpm its hard to tell if its any different. <br /><br />I'd use the 89 stuff myself. I think they idle better. Actually I'd use the 89 intake and the carbs off of a late model (99 & newer) V4/V6.
 

Dhadley

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Re: rebuilding 140, any tips?

for my 140 you said use 93 rods and pistons from a 90 degree looper.what size motor is that? also from what im understanding v6,intake manifolds and carbs will work with v4's? just a little grey area.I greatly appreciate the help.
Just in case anyone is following lets try to keep this in one spot. Maybe the mods can close the other thread if you ask them. Makes it easier for a slow guy like me to follow.<br /><br />Anyway the light rods and pistons are in the 93 and newer 200-225's. Some of the early 1993 200-225's still had the heavy rods with the light pistons. Some light rods showed up in the V4 loopers with the heavy pistons. Confused?<br /><br />Anyway if you use the light rods and pistons the motor idles amazingly smoother. The motor will rev slightly quicker but it'll be hard to tell in the rpm band we're talking about here. <br /><br />All stock recreational V6 loopers use 1 V4 intake manifold (4 throats and reed assy.) and 1 with 2 throats and reeds. V8's use 2 V4 manifolds. <br /><br />Carb assemblies include the carb body and throttle body. A V4 uses 2 2 bbl assemblies and a V6 uses 2 2 bbl and 2 1 bbl assemblies. One carb throat still feeds one cylinder. It'll be much clearer once you see a V6 looper intake and carb set up.
 

tony120

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Re: rebuilding 140, any tips?

thanks for clearing it up for me.
 
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