Quote:
Originally posted by verytricky
TELL MEEEEE!!!
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Mark decided, for his own reasons, that a one-piece riser/tailpipe was the way to go, mebbe coz it made the 'dry to the tips' aspect of the exhaust system a little simpler to acheive. However, from an engineering standpoint, or at least in my opinion, it's a shite way to do it, and goes against all Logic/Engineering rules!
When the boat flexes, and/or the motor moves on it's mounts etc, etc (both of which happen waaaaaayyy more than most people realise) the great big long lever, that IS, your exhaust tail pipe, is wanking up, down, left and right. As it's trapped near the tip where it exits the deck/engine upper cowl, all that movement and subsequent leverage is exherted on the small four bolt pattern locating the riser/tip to your manifold. basically, trying to work it loose and feckin up the joint/gasket.
The exhaust pipe & tip, should have a flexible section right up near the manifold (like any std manufacturer's setup) to allow for all this movement....but it doesnt
With such a flexi section in the system, I believe you'd never have another failure in that part again.
Trouble is, it's a one design class and it may be that you're NOT allowed to modify it!
When TD and I saw the first ones being built, we did discuss the exhaust system, and had wee betts on how long it would be before a failure, but as anyone who knows dear Mark will tell you, once he's made his mind up about something, little can be done to change it!
Ho Hum.
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Mercruiser Exhaust Manifolds/Risers
Linear Mode
