SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: Jon McEvoy on June 20, 2020, 11:31:24 AM

Title: Is a gen V bbc 454 interchangeable with gen IV
Post by: Jon McEvoy on June 20, 2020, 11:31:24 AM

I've searched, but just can't find the answer.  If I missed a post that answers this please link it for me.  I have a gen IV bbc 454 in my Commander jet boat running a Dominator pump.  I am dropping in a remanufactured motor and have a line on a gen V.  Are they interchangeable or will I need to mod things?  Thanks.

Title: Re: Is a gen V bbc 454 interchangeable with gen IV
Post by: sevans01 on June 20, 2020, 03:46:55 PM

Quote from: Jon McEvoy on June 20, 2020, 11:31:24 AM

I've searched, but just can't find the answer.  If I missed a post that answers this please link it for me.  I have a gen IV bbc 454 in my Commander jet boat running a Dominator pump.  I am dropping in a remanufactured motor and have a line on a gen V.  Are they interchangeable or will I need to mod things?  Thanks.

What are you talking about? Swapping parts from gen iv to gen v, or swapping motor for motor in the boat? If you’re swapping motors then the mounts will work. As long as you’re not changing to bbf or bbo.


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Title: Re: Is a gen V bbc 454 interchangeable with gen IV
Post by: Jon McEvoy on June 20, 2020, 05:04:22 PM

Straight swap, motor for motor.  Out with the gen 4 and in with the gen 5. 

Title: Re: Is a gen V bbc 454 interchangeable with gen IV
Post by: Jon McEvoy on June 20, 2020, 05:05:21 PM

The gen 5 is a 'tin' motor.  So I don't have to worry about those parts.

Title: Re: Is a gen V bbc 454 interchangeable with gen IV
Post by: sevans01 on June 20, 2020, 05:22:29 PM

Motor swap should be straight forward. What kind of mounts do you have 3 point, 4 point, rail kit?


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Title: Re: Is a gen V bbc 454 interchangeable with gen IV
Post by: sevans01 on June 20, 2020, 05:44:23 PM

I did a eng. swap gen v to gen iv and did not have adjust anything with a 3 point system


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Title: Re: Is a gen V bbc 454 interchangeable with gen IV
Post by: TrollerDave on June 20, 2020, 08:05:15 PM

There were a couple of thing that I can remember.
One was that the Gen V has no mechanical fuel pump boss. You'll need an electric fuel pump.

The other had something to do with a main seal which won't have anything to do with a swap.

I think you should be good to go.


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Title: Re: Is a gen V bbc 454 interchangeable with gen IV
Post by: TrollerDave on June 20, 2020, 08:11:55 PM

Quote from: TrollerDave on June 20, 2020, 08:05:15 PM

There were a couple of thing that I can remember.
One was that the Gen V has no mechanical fuel pump boss. You'll need an electric fuel pump.

The other had something to do with a main seal which won't have anything to do with a swap.

I think you should be good to go.


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This link listed some good info.

https://www.stevesnovasite.com/threads/mk-iv-v-s-mk-v-v-s-mk-vi-bbc.87779/


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Title: Re: Is a gen V bbc 454 interchangeable with gen IV
Post by: sevans01 on June 20, 2020, 08:41:49 PM

Quote from: TrollerDave on June 20, 2020, 08:05:15 PM

There were a couple of thing that I can remember.
One was that the Gen V has no mechanical fuel pump boss. You'll need an electric fuel pump.

The other had something to do with a main seal which won't have anything to do with a swap.

I think you should be good to go.


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Yup forgot about fuel pump.


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Title: Re: Is a gen V bbc 454 interchangeable with gen IV
Post by: Jon McEvoy on June 22, 2020, 06:01:07 PM

I really appreciate the responses.  Thanks a ton.

Title: Re: Is a gen V bbc 454 interchangeable with gen IV
Post by: K-034 on June 22, 2020, 06:07:47 PM

Oil pan is different too


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Title: Re: Is a gen V bbc 454 interchangeable with gen IV
Post by: Jon McEvoy on June 23, 2020, 12:39:16 PM

What about the flywheel?