going thru motors every season. need help
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going thru motors every season. need help

  1. #1
    Senior Member bartel's Avatar
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    Default going thru motors every season. need help

    I have a 1978 crusader mini day.
    I have a basicly stock chevy 2 bolt main 454. has airgap intake hardin headers and a demon 800 carb.

    anyway i have had the boat on the water for 3 years and i have blown up three motors.

    i have used the same engine builder every time. so i think that is going to stop.

    but before i spend more money on a new motor i am wondering if my boat could be causing this.

    the motor is 3 pointed in the boat. has a panther jet so the bell housing clamps right to the pump and i put a bbc mount plate on the front.

    I want to know if there isany way my boat is damaging the motors.

    the first time i spun the bearings out of the motor cant remember what happend the second time and this time i found the cam broken in half and pieces of piston in my oil pan.

    two weeks ago i took the boat to mead and it ran great. i did not notice any noise when putting it onthe trailer. i brought it home and the next time i tried to start it in the back yard. i heard a clucnk and the motor stoped. i thought the starter was stuck. but after digging into the motor i found it was blown up pretty good.

    any insight would be helpfull. i can supply pics if you need them. thanks

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    Senior Member DuaneHTP's Avatar
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    What rpm are you runing the motor at? For how long? What oil are you using? What temp is the motor running? What kind of oil pressure are you seeing? What size oil pan do you have?

  4. #3
    Senior Member chevy's Avatar
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    Gotta make sure that the h-bar [U joint] is straight if it is crooked and whipping it can take out the main bearings, just something you might want to check out.

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  6. #4
    Senior Member bartel's Avatar
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    Quote Originally Posted by DuaneHTP View Post
    What rpm are you runing the motor at? For how long? What oil are you using? What temp is the motor running? What kind of oil pressure are you seeing? What size oil pan do you have?
    i can hit about 5700rpm if i am all in. not long. its a cruiser up and down the river. do most my time on the beach drinking. lol

    temp has never been a concern probably on the low side. oil pressure not sure on the number i will have to look at my guage. i know where the needle usually sits.

    meldon 10qt oil pan

    i use the cheap stuff to break inthe cam and then syn 30w.

    hope this helps

  7. #5
    B1 Racing cs19's Avatar
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    Im thinking you need a new engine shop, the jet-drive shouldnt cause some of the issues you've explained.

    CS

  8. #6
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    Dont use cheap oil to break the next one in !!! Even expensive oil mite not have what you need for break in. How are you breaking these engines in ?
    No more Mr. Nice Guy !

  9. #7
    Senior Member Delemorte's Avatar
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    Quote Originally Posted by bartel View Post
    i use the cheap stuff to break inthe cam
    Why?
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

  10. #8
    Senior Member glastornjet73's Avatar
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    ALWAYS use a 40+ strait weight oil with a bottle of zink additive if using automotive oil!!! personally i use 20/50 mobile delvac fleet oil its cheep and TWICE as good as ANY automotive oil on the market and the 2hp you will loose pumping that thick oil will be worth it in the long run! just my 0.02

  11. #9
    classic hot boater Orange Peel's Avatar
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    Default Cheap oil

    Quote Originally Posted by bartel View Post
    i can hit about 5700rpm if i am all in. not long. its a cruiser up and down the river. do most my time on the beach drinking. lol

    temp has never been a concern probably on the low side. oil pressure not sure on the number i will have to look at my guage. i know where the needle usually sits.

    meldon 10qt oil pan

    i use the cheap stuff to break inthe cam and then syn 30w.

    hope this helps

    The cheap oil may be the problem? When a cam is new you need to Add the comp cam additive, the oil now days sucks!!
    I run Rotella 15 40 and have no problems..

    And also X 1000 on what CS19 said!!!!!!!!!!!!!!!!!!!!!!

  12. #10
    Senior Member OkieDave's Avatar
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    Default need BBF

    need to quit using bowtie stuff. go with BBF!!!

  13. #11
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    Default Wanted!!!!!!

    Need new engine builder!!!!! Have builder break in new engine on run in stand, and follow his oil reconmendations......

  14. #12
    Pink Taco Reagan's Avatar
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    Quote Originally Posted by OkieDave View Post
    need to quit using bowtie stuff. go with BBF!!!
    x2

  15. #13
    Senior Member bartel's Avatar
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    i have always had the builder break thecam in. we use rotella. i said cheep stuff cause it is a lot cheeper than the syn stuff i run once the motor is broken in.

    i will check the alignment beforethe new motor goes in. but like i said it is a three point set up so getting it wrong is kind of hard. the bell housing clamps right tothe pump.

  16. #14
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    Quote Originally Posted by bartel View Post
    i have always had the builder break thecam in. we use rotella. i said cheep stuff cause it is a lot cheeper than the syn stuff i run once the motor is broken in.

    i will check the alignment beforethe new motor goes in. but like i said it is a three point set up so getting it wrong is kind of hard. the bell housing clamps right tothe pump.
    Actually you can still get it off align. Granted the bellhousing clamps around the pump but where the 2 front mounts attach can be too high or low. So put a digital level on the pump and on the motor and see if they are close.

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