BBC engine plate thickness
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BBC engine plate thickness

  1. #1
    Senior Member holorinhal's Avatar
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    Default BBC engine plate thickness

    I know it is here some where but My searches have come up empty.

    How thick should an engine plate be, 3/8" or 1/2"?

    Is there a specific width and thickness for the rails? Is 2" x 2" x 3/8" ok for rails? Thanks.....Hal

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  3. #2
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    ONE PIECE (stringer to stringer) 3/8", 6061-T6.

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    Quote Originally Posted by GFINISHLINE View Post
    ONE PIECE (stringer to stringer) 3/8", 6061-T6.
    Yup, what George said. This is what mine are as well. I think I covered it on my project page somewhere.
    How you been Hal?


    I also used 2" flat bar on the outside of the stringers to backup the rails and used 3/8" bolts. I drilled the holes 2" from the ends and then split the difference betweem them. On mine it came out to be 10" between the bolts and I have 5 or 6 bolts per side (can't remember for sure).

    Take care.......john

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  6. #4
    Senior Member cyclone's Avatar
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    it doesn't have to be one piece but it ought to be 3/8 thick.

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    Senior Member Boat 405's Avatar
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    3/8" is fine. one piece is most common for the back. two piece is preferrable for the front like this.
    Boat 405.

  8. #6
    Senior Member jetboatperformance's Avatar
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    3/8 xs 3 or 4 ... Tom

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    Spreading out the stresses is why you run "motor rails and plates". To use big ol' heavy BS TWO PIECE front plates shows just how little some people know about race/play boat rigging. I suggest you use ONLY the lower four BLOCK bolts and make it a ONE PIECE UNIT! SAVE some weight and save the stringers at the same time. The over weight mounts shown do not support the stringers and could come loose and or damage the stringers. "Some things LOOK GOOD, but others LOOK GOOD AND LAST A LONG TIME!" Well those two piece plates do work well ON THE TRAILER! If you are going to use the boat, ONE PIECE PLATE, if you are going to 'jack off in the garage' do the "two piece deal" it will last longer there.

  10. #8
    Senior Member OUTLAW HALLETT's Avatar
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    wow, ouch,

  11. #9
    Senior Member Boat 405's Avatar
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    Quote Originally Posted by GFINISHLINE View Post
    Spreading out the stresses is why you run "motor rails and plates". To use big ol' heavy BS TWO PIECE front plates shows just how little some people know about race/play boat rigging. I suggest you use ONLY the lower four BLOCK bolts and make it a ONE PIECE UNIT! SAVE some weight and save the stringers at the same time. The over weight mounts shown do not support the stringers and could come loose and or damage the stringers. "Some things LOOK GOOD, but others LOOK GOOD AND LAST A LONG TIME!" Well those two piece plates do work well ON THE TRAILER! If you are going to use the boat, ONE PIECE PLATE, if you are going to 'jack off in the garage' do the "two piece deal" it will last longer there.
    Wow....... I think you might have an uphill battle on this one. But hey I guess I don't know anything about rigging, nor do quite a few other peeps on here.
    Boat 405.

  12. #10
    Senior Member cyclone's Avatar
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    Quote Originally Posted by GFINISHLINE View Post
    Spreading out the stresses is why you run "motor rails and plates". To use big ol' heavy BS TWO PIECE front plates shows just how little some people know about race/play boat rigging. I suggest you use ONLY the lower four BLOCK bolts and make it a ONE PIECE UNIT! SAVE some weight and save the stringers at the same time. The over weight mounts shown do not support the stringers and could come loose and or damage the stringers. "Some things LOOK GOOD, but others LOOK GOOD AND LAST A LONG TIME!" Well those two piece plates do work well ON THE TRAILER! If you are going to use the boat, ONE PIECE PLATE, if you are going to 'jack off in the garage' do the "two piece deal" it will last longer there.
    no offence sir, but if a stringer fails with a two piece attached to it then the boat has bigger problems than the motor mount design.

    1 inch stringers in a boat that gets beat on like it owes me money at the river and the race track:



    I know quite a few people using the same mounting system in 30 year old boats without issue.

  13. #11
    Senior Member Boat 405's Avatar
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    Quote Originally Posted by GFINISHLINE View Post
    Spreading out the stresses is why you run "motor rails and plates". To use big ol' heavy BS TWO PIECE front plates shows just how little some people know about race/play boat rigging. I suggest you use ONLY the lower four BLOCK bolts and make it a ONE PIECE UNIT! SAVE some weight and save the stringers at the same time. The over weight mounts shown do not support the stringers and could come loose and or damage the stringers. "Some things LOOK GOOD, but others LOOK GOOD AND LAST A LONG TIME!" Well those two piece plates do work well ON THE TRAILER! If you are going to use the boat, ONE PIECE PLATE, if you are going to 'jack off in the garage' do the "two piece deal" it will last longer there.
    please show some pics of how everyone should do it o wise one.
    Boat 405.

  14. #12
    Amber Racing Services BUSBY's Avatar
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    Quote Originally Posted by GFINISHLINE View Post
    Spreading out the stresses is why you run "motor rails and plates". To use big ol' heavy BS TWO PIECE front plates shows just how little some people know about race/play boat rigging. I suggest you use ONLY the lower four BLOCK bolts and make it a ONE PIECE UNIT! SAVE some weight and save the stringers at the same time. The over weight mounts shown do not support the stringers and could come loose and or damage the stringers. "Some things LOOK GOOD, but others LOOK GOOD AND LAST A LONG TIME!" Well those two piece plates do work well ON THE TRAILER! If you are going to use the boat, ONE PIECE PLATE, if you are going to 'jack off in the garage' do the "two piece deal" it will last longer there.
    I guess most of the race boats out there on the NJBA & IHBA circuits dont understand how rigging is supposed to be done.

    2 piece front motor plates are very common all the way from River Racer to Top Fuel ... hmmm

  15. #13
    Senior Member Futs's Avatar
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    C'mon now, this guy has been building engines, rigging boats and giving advise for over 25 years. He must know what he is talking about with a statement like that....


    Maybe he should get back to the open water and rent his ring.

  16. #14
    Senior Member lbhsbz's Avatar
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    Quote Originally Posted by GFINISHLINE View Post
    Spreading out the stresses is why you run "motor rails and plates". To use big ol' heavy BS TWO PIECE front plates shows just how little some people know about race/play boat rigging. I suggest you use ONLY the lower four BLOCK bolts and make it a ONE PIECE UNIT! SAVE some weight and save the stringers at the same time. The over weight mounts shown do not support the stringers and could come loose and or damage the stringers. "Some things LOOK GOOD, but others LOOK GOOD AND LAST A LONG TIME!" Well those two piece plates do work well ON THE TRAILER! If you are going to use the boat, ONE PIECE PLATE, if you are going to 'jack off in the garage' do the "two piece deal" it will last longer there.
    Only if someone forgets to tighten the bolts that bolt the plates to the motor.

    I hear 300lb chunks of cast iron tend to make decent structural members....I fail to see why a 2 piece design would be any weaker than a one piece. Remember, if the bolts are properly torqued and one uses the correct washers, the bolts are acting in tension, not in shear....so it makes no difference.

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