1200 RPM below porting

[RUDERIOT]

I have a 3.0 litre bridgeport [Evolution Marine stage 3] .It has big bore carbs, 195 lbs. compression, fingerports,& modified reed cages. The powerhead sits on a Mad efi modified adapter & shortie mid section with a CLE gearcase& a Tillman lightning cut chopper. It has unlimited ignition boxes & a high output stator with 350 volts primary output, both by Rapair.


The block is ported to run 8400 rpm, however 7200 [by a gafrig tach] is all there is!




It is on a Rapidcraft Riot. The unit with all the mandated equipment, sandbar poles, 1/2 tank o gas & a full cooler o Bud
weighs 1220 lbs. I am nearly positive that the problem is in the ignition system. This thing leaves hard, pulls hard through the midrange, then hits the wall at 7200. :mad: Any thoughts guys? MSD is not an option $$$$. THANKS !!

[RRRevinrude]

loose the v-6 ignition system--go to either v-4 looper flywheel& stator or go with yamaha ignition--thats the missing piece to your puzzle.....................greg

[RUDERIOT]

Greg: Thanks for your reply! Not that i dont believe you, but i dont understand what good a V /4 flywheel &stator would do other than the V/4 flywheel can be made lighter than a V/6

.Im also in the dark about the yamaha conversion [availibility& cost.]

[racer]

350 volts is extremely high, at what rpm do you have this amount and on what meter? If you are running a stock 35 amp flywheel you are asking for trouble at those kinds of rpm. Did the engine ever actually turn 8400?

[RUDERIOT]

racer:I was told by Marv @ Evolution Marine that the problem was the stock stator & that Rapair could build me one with the prescribed 350 volt primary output [per Marv]. I called them& they knew what i was talking about. The one they sent me gained me 800 rpm. I didnt check it because it helped so much.[6200 to 7000rpm.
NO,it never turned 8400, thats just the porting specs. The shortie mid helped holeshot A BUNCH!!!,& top end 200[7200]

Shure would like to have those 1200 Rs!!! THANKS! RudeRiot PS: I know youre right about the flywheel. Its livin at 7200 & if i figure out the problem Ill get a light one.

[racer]

I have never seen a repair stator at 350 volts they do have better saturation time. Have you checked the jetting/piston colors? What size prop are you running? Have you checked the tack?

[RUDERIOT]

Racer: Sorry for the delay... Piston dome color is a nice medium toasty brown; the last rebuild lived over 400 hours [hr. meter],& they wernt easy hours!

The prop is a Tillman lightning cut chopper.

Ichecked the tach against a O.M.C. digital test tach& it was fine. I verry much appreciate your interest &help!! Thank you!!:D