TRS Transome Exhaust/Cutouts
 

Is there a guide for factory TRS transome exhaust cutouts? The boat was an original through hub. Running CMI's with tails. I can easily make cutouts to adapt my set up to work however would like to be somewhat close to factory specs in case I change the exhaust out at a later time. If someone with similar set up could post some measurements from a common reference point, that would be great. This is for a twin application without hyd. steering.

Thanks,
John

Fixx
 

They are the same with as a bravo but 3'' higher because of steering interference,If you have cmi's and their not the taller version or like thease http://www.offshoreonly.com/classifi...o26865-en.html and if you have hydraulic steering i would cut them as they were a bravo..

I guess the main thing I would need then is the width - center to center of the exhaust holes. I will probably install them as low as I can without interfering with the steering components. So if someone knows or could measure center to center is all I would really need. I can easily figure out the rest.

Thanks,
John

I don't know if there ever was a factory through transom exhaust setup for a TRS. I think their all aftermarket exhaust set ups going through the transon. I think it would depend on where it needed to be for your type of exhaust. Mine actually go out over the power steering. I guess it depends on what kind of tails you have. The width could be different with different brands of pipes also.

I would just like to stay within reason so if or when I do change out the exhaust I wont be all over the board. Could somebody post the center to center at the tips of a bravo for stock through transome exhaust? I have room with the tails I am using to move a little. I just hate to cut out for an exact fit for my cmi etops and then be screwed down the road. All I need is the width of a so called NORM if there is such a thing.

Thanks,
John

Fixx
 

Per mercury! Crankshaft centerline up tp center of tips is 13-27/64.............center to centerof the exhaust tips is 27-21/64..

Also take into consideration if your dart cylinder heads have a raised exhaust port,you will have to add that in to the crankshaft centerline and the tip centerline..

give me your email and ill take a pic of the bravo exhaust cutout chart i have so you can see the numbers im talking about..

I have Stainless Marine. Here is a pick for reference. I'll get you measurements tomorrow if you want?

http://i43.photobucket.com/albums/e3...e/backside.jpg

Fixx
 

A pic of your engines please :)

Sorry, I hate to disappoint. But nothing spectacular to look at. Just a couple of high strung 600HP 468's. The red one is mine, prepped for the dyno with JimV's blue NA565.

http://i43.photobucket.com/albums/e3...yatthedyno.jpg

Fixx
 

opps sorry i failed to mention,a pic of or with the risers.:)

Edit! i think those are your tisers in the pic,,looks to be 3'' taller ones...i dont think your measurements wil be accurate for his boat..

Ya if you could measure yours also from center to center of the tips that would be great. Again, I would just like to find a happy medium so I don't limit myself to just the cmi's. I'll adjust the height according so I Just miss the steering components.

Thanks,
John

Thats my riser in the back of the truck.

Here is the measurements that I came up with.
http://i43.photobucket.com/albums/e3...lessmarine.jpg

Cool, that should put me in the ball park. My width was the biggest concern considering the cmi's can vary so much. If you rotate the tails even slightly it can really throw off the overall width. Like I said I just wanted to be somewhere close in case I went with gils or stainless marine, etc.

Thanks again,
John

Remember mine are Stainless Marine.
http://i43.photobucket.com/albums/e3.../tailpipes.jpg

Looks nice. You dyno yet?

yeah, 590HP@6250 and 560TQ@5000. There is probably still some left on the table. I was only running Barry Grant/Holley 750's and they were pulling hard on the jets. I had to jet down instead of up. I would like to try some 850-950's.

I have 4" pipes going through ~5 1/4" wholes with the Stainless and rubber rings over them

awesome. try jims 950 hp. those are actually flow like 830 cfm. might be worth a try if he still has it. you might be surprised.
john