79 Scarab 300 resto
#322
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Did you upgrade all your fuel hoses, fuel pump and water separator when you increased the horsepower. More horsepower more fuel the stock fittings, hoses and water separator filter fittings are too tiney and need to be replaced which will cause detonation. I may have asked this earlier.
#324
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somebody had mentioned detonation in the first set of engines. if the engines cannot get enough fuel they will detonate as I am sure you already know this. but always forgotten to upgrade when more horsepower is added. meaning if you have 3/8 hoses you will probably need 1/2 inch hoses and fittings to allow more volume
#327
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I had the compression 9.5:1 compression small amount of boost and aluminum heads 2 750cfms carbs and no thermostat. never had a single issue in my single engine scarab.
#328
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Also in the process of installing hydraulic steering. Got this unit used from Gordon Demarco on the powerboat swap shop on Facebook. This is an older (late 80's unit) by Latham. I've been in touch with Tom Gongola at Latham marine. He's gonna rebuild and replate these cylinders for me. I'm gonna call him and ask him this question tomorrow but maybe one of you will know the answer to this question. See the way I have these bracketsmounted to the transom? I did it this way to get the cylinders down in line with the horizontal gimbal plane is. im concerned whether this will work or not. I think the way I have brackets on the transom (90* out of the way they normally are) may put excessive strain on the brackets. What do you guys think?
![](http://i159.photobucket.com/albums/t129/Heath_Blair/Mobile%20Uploads/2EE15D2F-5B05-4839-A4EE-6259AD0F929E_zpsc28uvjzu.jpg)
![](http://i159.photobucket.com/albums/t129/Heath_Blair/Mobile%20Uploads/2EE15D2F-5B05-4839-A4EE-6259AD0F929E_zpsc28uvjzu.jpg)
![](http://i159.photobucket.com/albums/t129/Heath_Blair/Mobile%20Uploads/834A2EBE-AB15-43C3-A402-7EF2C186A0B6_zpsqojkpbdg.jpg)
Last edited by hblair; 02-16-2016 at 09:34 PM.
#329
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I have a 38 Cigarette here that has them mounted the same way and has had no problems. and its an 89 model they are factory installed.