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Forum: General Q & A

01-24-2019, 02:46 PM

Replies: 11

Performance questions twin Merc 7.4 vortec

Views: 1,573

Posted By Emilio66

Thanks... the main issue is that being an old...

Thanks... the main issue is that being an old boat I bought it not on the better shape possible with some small issues , the last owner said it hit 65 but you know about those figures, almost all lie...

Forum: General Q & A

01-24-2019, 11:26 AM

Replies: 11

Performance questions twin Merc 7.4 vortec

Views: 1,573

Posted By Emilio66

One sucks at idle but it is smooth on the way to...

One sucks at idle but it is smooth on the way to higher rpms at 4000 rpm don’t missfire but it does not go any far (of course trimming the engines ) ....

Thanks for all the help!

Forum: General Q & A

01-24-2019, 10:25 AM

Replies: 11

Performance questions twin Merc 7.4 vortec

Views: 1,573

Posted By Emilio66

Don’t know the brand of the ignition however who...

Don’t know the brand of the ignition however who knows how old it is .... as well as the coils ... yes the boat runs in salt water and it has a layer of antifouling, when I did the speed test it was...

Forum: General Q & A

01-24-2019, 09:39 AM

Replies: 11

Performance questions twin Merc 7.4 vortec

Views: 1,573

Posted By Emilio66

Hi thanks for the answer, now I have a place to...

Hi thanks for the answer, now I have a place to start

the ignition system is stock and I did not change it neither the coils so I will start from there. I have Holley 4175 CFM 650 and I got a...

Forum: General Q & A

01-24-2019, 07:05 AM

Replies: 11

Performance questions twin Merc 7.4 vortec

Views: 1,573

Posted By Emilio66

Thanks for the answer First I believe that...

Thanks for the answer

First I believe that I have 2( 7.4 non mag) but not sure , pain in the ass to find it out since engine has been painted and I only know the engine serial numbers for the...

Forum: General Q & A

01-23-2019, 04:53 AM

Replies: 11

Performance questions twin Merc 7.4 vortec

Views: 1,573

Posted By Emilio66

Performance questions twin Merc 7.4 vortec

Hi !

I have a Tullio Abbate elite 30 with two vortec 7.4 engines ,bravo one with mirage 23 P props and I can not go faster than 50 mph. I did compression test and it came up perfect , I put new...

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