Twin 454's efi holley setup - up and running
10-18-2022 | 05:19 PM
#1
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From: Gold Coast OZ
Twin 454's efi holley setup - up and running
Hi guys, Just after some guidance - Finally up and running with the HP EFI Holley systems on my 454's (and just for you that don't know this is a 6 tonne Searay)
Did some run in time 1 hour under load at 1500 - 2000 rpm at 6-10 knots. Once in open area i pushed them to 3500 rpm for 15 mins, at 3500 rpm - map was 80 kpa - AFR's 12.8 to 13 - All temps and oil pressure spot on - Fuel pressure good.
IT SEEMED TO RUN VERY SMOOTH - I had 2 laptops hooked up while running and all looked good. ( DONT FORGET THAT THIS IS NOT HIGH PERMORMANCE LIKE MOST OF YOU GUYS - its a family boat that i want good reliability with)
If anyone knows my previous problems - well i have been here before!! First time i ran in under load and ran up to 3500 rpm and within 10 mins black smoke - blow by and that was it. - At pull down - ring lands were melted on pistons 6, 7 & 8 on both engines.
Smitty helped me with maybe it being to high AFR's (in the 14's) and maybe to advanced ign - and some others with maybe fuel lacking as well.
i have the HP Holley Systems - Cam plug - crank sensor (hall effect) and MSD smart coils, my cam is the stock Mercruiser roller.
Apparently the only real way to make sure im not to lean is to check plugs
So how long have i got to back off from say 3500 rpm slow down ( drop anchor) and pull plugs??? Will this still be accurate readings or in that short time be black and rich again.
How do you do it in a boat ( stick with the subject here!!!).
Im running richer than my first failure - because i can always move it out (leaner) And now only 14 AFR's at idle and max AFR's at 12.7.
I would also like some help with knock sensors - i want to put them on but don't know where to start with resonance values in the Holley system.
Happy to show any and all Holley settings i am running.
Thanks Guys
Did some run in time 1 hour under load at 1500 - 2000 rpm at 6-10 knots. Once in open area i pushed them to 3500 rpm for 15 mins, at 3500 rpm - map was 80 kpa - AFR's 12.8 to 13 - All temps and oil pressure spot on - Fuel pressure good.
IT SEEMED TO RUN VERY SMOOTH - I had 2 laptops hooked up while running and all looked good. ( DONT FORGET THAT THIS IS NOT HIGH PERMORMANCE LIKE MOST OF YOU GUYS - its a family boat that i want good reliability with)
If anyone knows my previous problems - well i have been here before!! First time i ran in under load and ran up to 3500 rpm and within 10 mins black smoke - blow by and that was it. - At pull down - ring lands were melted on pistons 6, 7 & 8 on both engines.
Smitty helped me with maybe it being to high AFR's (in the 14's) and maybe to advanced ign - and some others with maybe fuel lacking as well.
i have the HP Holley Systems - Cam plug - crank sensor (hall effect) and MSD smart coils, my cam is the stock Mercruiser roller.
Apparently the only real way to make sure im not to lean is to check plugs
So how long have i got to back off from say 3500 rpm slow down ( drop anchor) and pull plugs??? Will this still be accurate readings or in that short time be black and rich again.
How do you do it in a boat ( stick with the subject here!!!).
Im running richer than my first failure - because i can always move it out (leaner) And now only 14 AFR's at idle and max AFR's at 12.7.
I would also like some help with knock sensors - i want to put them on but don't know where to start with resonance values in the Holley system.
Happy to show any and all Holley settings i am running.
Thanks Guys
Last edited by Waterlife; 10-18-2022 at 05:24 PM. Reason: mistake
05-30-2023 | 01:43 PM
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Joined: Jul 2020
Posts: 323
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From: Cortlandt Manor NY
I am also going to be on Holley HP but for a more of a performance application in a 509. I want to avoid what you went through so I want to be sure I have the Holley adjusted correctly as well as far as timing and fueling. I have a bump in compression and an aftermarket cam.
