weight concearns

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   does anyone have any imput or first hand experience with the way reducing motor weight changing the wake behind the boat. 

By weight reduction I mean going with aluminum heads and aluminum exhaust manifolds.

I want to improve HP but don't want to change the wake.

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87BFN owner Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: August-25-2006 Location: Ypsilanti, MI Status: Offline Points: 2194	Post Options Post Reply Quote 87BFN owner Report Post Thanks(0) Quote Reply Topic: weight concearns Posted: September-25-2006 at 3:26pm
	does anyone have any imput or first hand experience with the way reducing motor weight changing the wake behind the boat. By weight reduction I mean going with aluminum heads and aluminum exhaust manifolds. I want to improve HP but don't want to change the wake.
	MY 87BFN

79nautique Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-27-2004 Location: United States Status: Offline Points: 7872	Post Options Post Reply Quote 79nautique Report Post Thanks(0) Quote Reply Posted: September-25-2006 at 6:55pm
	the exhaust isn't an issue but the aluminum heads are a little different since these marine engines don't get very hot so they don't expand the way they would in automotive applications and you can have issues running them, Now if it was an AL block with steel sleeves and AL heads that's different, but cast iron block and AL heads don't mix very well.

boat dr Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: June-27-2004 Location: United States Status: Offline Points: 4245	Post Options Post Reply Quote boat dr Report Post Thanks(0) Quote Reply Posted: September-25-2006 at 7:57pm
	the issue i see here is not the difference in the expansion rate(this would be a moot point)between a block running at 195 degrees vs. a block running at 150 degrees,i would be concerned with the dissimular metals,electrolysis at the water inlets.a zinc anode would slow down or totaly stop this installed,then add the stainless manifolds and you have alm. oxide instead of trick heads.........also check the runner size, most have 200 to 220 cc runner size this is not condusive for proper low rpm torque production.you need 150 to 165 cc runners............. boat dr
	boat dr 1949 Dart 1964 American Skier

weight concearns

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