What's been done to this Promax??

[racervboat]

does anyone know who is removing the limiter on stock boxes?

Brucato or simon want 675 + the ride and they say the limiter is all they can change so I bought a brucato acu for 800.00 .I have the a17 box works great but that 6700 limiter sucks and I do have steel rod bearings.

[roadkill636]

675??? For what?

[racervboat]

675??? For what?

Just to change the stock limiter to what you want it set for.I would like to try your box on mine.The brucato with the stock 225 pm curve goes the same as the a17 box but the limiter is at 9000 and I know the brucato is rich and have to wait till spring to fine tune it.Both boxes run right at 67-6800 @ 93mph on my 1998 mirage ski racer 28-30 pitch prop.Your box with the higher limiter is what I really would like to try to see if I could break 100mph and would only need to spin it 7400-7500 rpm safely .

[roadkill636]

Just got a call from Brucato... need to replace 2 injectors and up the fuel pressure to 37-38psi

[racervboat]

Just got a call from Brucato... need to replace 2 injectors and up the fuel pressure to 37-38psi

What pressure were you running? needs to be 39 psi.

[roadkill636]

Dont know. Haven't checked it yet

[tux974]

If you have 36ish your fine. 39 is the regulator rating. Simple enough to check with tire pressure gauge when running.
When I’m concern I run with a temporary gauge laying on the floor next to me to make sure it is holding at least 35 constantly.
Autozone sells a good fuel pressure gauge that threads on to shader valve and works very well. For temp setup I jut use 20' of 1/4" hose.

[roadkill636]

Heads stamped 35

[Merc 2.5]

Heads stamped 35

Did u just have em cut or u just pulled em? What was compression

[roadkill636]

I pulled the heads a month ago. Cleaned em up with a plastic finger ROLOC disk.

[roadkill636]

Somebody been doing some port cutting too. But why this extra tit in the exhaust?

[TEXAS20225]

looks like a ooops !!! ive had many port jobs none ever had that i had Ruck do a couple for me but james perry's porting put him out of the contest it was by far the most accurate porting jobs i ever got he did remove all sleeves to port each one and install it back in same hole not to mention the quality of his chest cutting it was almost too pretty to build i wanted to put glass on top and make a living room coffee table lol but that did not fly around here

[Dave Strong]

looks like a ooops !!! ive had many port jobs none ever had that i had Ruck do a couple for me but james perry's porting put him out of the contest it was by far the most accurate porting jobs i ever got he did remove all sleeves to port each one and install it back in same hole not to mention the quality of his chest cutting it was almost too pretty to build i wanted to put glass on top and make a living room coffee table lol but that did not fly around here

someone was in a hurry or not a seasoned pro.

Dave

[roadkill636]

All 6 look like this

[Merc 2.5]

If all exactly same , maybe it's kinda directing exhaust? Sure they didnt mess up in same spot on every cyl

After another look. It looks like where they started the die grinder and doin the porting ,
Then again the chamfer doesn't look the same aroi.d the port