1957 35 seahorse twin engines.

[rolmops]

Hello.<br />I am still working on my twin engine project and the more I think about it, the more I want to have a left hand rotation and a right hand rotation propeller.<br />Would this mean that I have to remove the shifter lock? Is there a shifter lock in the market that locks what is now forward and stays open in reverse?<br />Then there is the problem with noise.These old babies do know how to make it. With two engines it might become just plain nasty.Is there something that can be put in the air silencer? Or does gluing some rubber foam in the cowling help?<br />Any answers will be highly appreciated.<br />Thank you, rolmops.

 

[rodbolt]

Re: 1957 35 seahorse twin engines.

hello<br /> dooode give up on the counter rotating<br /> its just not nessasary with those engines<br />if you had a 60 mph cruiser then maybe.when one of the guys I used to work with powered his boat with twin mercruiser 140's they were both standard rotation and it ran 53 mph with no problems.<br /> good luck and keep posting.

 

[Paul Moir]

Re: 1957 35 seahorse twin engines.

They suffed the cowlings of later models with 1" open cell foam and removed the silencer. Kept it up for quite a few years too, so I guess it helps.

 

[Chinewalker]

Re: 1957 35 seahorse twin engines.

Hi Rolmops,<br /> Counter rotating the lower units isn't going to happen. It would require the reverse gear to become the forward gear. The reverse gear has no real thrust handling capabilities and you would quickly tear up the gearcase...<br />- Scott

 

[rolmops]

Re: 1957 35 seahorse twin engines.

Hello.<br />Thank you rodbolt,Paul and Scott.<br />I should not have to worry about counter rotation since it sounds impossible and unnessecary.That is one big problem less.<br />As for the noise.Can I just replace the air silencer with the type of screen that is used on the rd 21 1959 engine or does that decrease the potential air intake too much?<br />Does anybody know of a bonding material that adheres to aluminum and open cell foam without melting the foam?<br />I hope to be able to have this rig in Cape Cod Bay next spring and fill it up with blues and stripers.<br />Thanks again for your good advice.

 

[ezeke]

Re: 1957 35 seahorse twin engines.

Hi Rolmops, <br /><br />I found and used a good adhesive from JC Whitney.<br /><br />It is high heat resistant and they sell it with their mylar coated foam hood insulator:<br /><br /> Heat Shield Contact Adhesive

 

[Chinewalker]

Re: 1957 35 seahorse twin engines.

Hi Rolmops,<br /> The only downside of removing the intake is that it makes the motor a fair amount louder.<br /> I run a '56 Johnson 30 on my old 36-class racer with no shroud or carb cover at all. Motor runs fine...<br /> Some newer motors will actually run better with the carb covers on as they are actually designed to act as a tuner of sorts. Operates on the same principles as exhaust tuners using pressure waves to accelerate intake...<br />- Scott

 

[rolmops]

Re: 1957 35 seahorse twin engines.

While trying to insert open cell foam into the cowling,I discovered why after 1958 the cowlings became bigger and the noise became less.....