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Originally Posted by ridefast77
(Post 3144189)
not sure if any thing is rong but i cant get my rpms over 4200 wide open and trimed out i was told it should turn more like somewere in the 4800-5200 its a stock 7.4 (454) mpi with stanless marine exhaust is that true
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Originally Posted by PSlonaker
(Post 3146251)
NO...it is not true. If you are running a 7.4 (non mag motor), then your rpm range should be around 4200 to 4600 and no more. Turning a 7.4 up to 5000 and more is not pushing the limits...it is shoving the limits. More than likely, you will have a rod hanging out the side of it.
My 29ol with 7.4 MPI's rev limiters kicked-in about 4650, but the older 7.4 carbed motors like my 92' 240 would run almost 5000 if overtrimmed with a 23p Mirage. Rev limiters were the best thing invented for marine engines... XT |
Originally Posted by PSlonaker
(Post 3146251)
NO...it is not true. If you are running a 7.4 (non mag motor), then your rpm range should be around 4200 to 4600 and no more. Turning a 7.4 up to 5000 and more is not pushing the limits...it is shoving the limits. More than likely, you will have a rod hanging out the side of it.
100% right!! if you had MAGs (385hp) not MPIs (310hp) you would be able to push them a little more. Not the MPIs ive been thought this already. good luck. |
Originally Posted by ridefast77
(Post 3146236)
ill have to fine one
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thanks guys, i looked on my motor covers and it dose say rpm 4200-4600 so i should be able to pull 4600 right, but im not so i guess ill try a smaller pich prop
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Originally Posted by ridefast77
(Post 3147225)
thanks guys, i looked on my motor covers and it dose say rpm 4200-4600 so i should be able to pull 4600 right, but im not so i guess ill try a smaller pich prop
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thats cool ill try to call you later thanks
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