100 over 1/2 fill the block?
+ Reply to Thread
Page 1 of 4 1 2 3 4 LastLast
Results 1 to 14 of 53

Thread:
100 over 1/2 fill the block?

  1. #1
    Super Moderator HammerDown's Avatar
    Join Date
    Dec 2007
    Location
    The Right Coast/SE-PA
    Posts
    5,488

    Question 100 over 1/2 fill the block?

    Mark-4 block, considering to bore 100 over w/4.25 stroke = 505ci
    Just asking, is there any reason for a river/lake runner not to fill to the water pump line or lower or...not at all?
    For a 1/4 mile burner I wouldn't question filling the block but, I'm not sure cooling or other issues could be a factor in how I use my boat.
    (Rex bypass T-stat used, usually see 160 +- 5 current block water psi usually 8 lbs)
    As always, thanks for any feedback.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,510

    Default

    Water temp will only be slightly effected, but oil temp will change.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  4. #3
    Super Moderator HammerDown's Avatar
    Join Date
    Dec 2007
    Location
    The Right Coast/SE-PA
    Posts
    5,488

    Default

    Quote Originally Posted by steelcomp View Post
    Water temp will only be slightly effected, but oil temp will change.
    And the need for a oil cooler >which I probably would have added for this build, for sustained runs down the river. Also concerned if water pressure when using my REX T-stat could be a issue too. I know water doesn't compress but less area to hold water may cause a higher pressure spikes???
    Thanks for the feedback
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    mo balls than $cents$ IMPATIENT 1's Avatar
    Join Date
    Dec 2007
    Location
    hugo,okla
    Posts
    11,733

    Default

    i built basically the same shortblock but with 13.5 to 1 pistons to make a 505 and ran a 450hp shot of nitrous to it without a half fill, never a sign of cap walk.thought about it but i was cutting weight where i could, filler is heavy.we did half fill this twin turbo 496 we're building but it'll get a oil cooler , turbos alone will do a number on oil temps i'm sure

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  7. #5
    Senior Member wagspe208's Avatar
    Join Date
    Apr 2008
    Location
    waterloo
    Posts
    2,034

    Default

    How about not boring it .100 over, sacrificing the 15 cubic inches, and saving 60 pounds of weight.
    The real advantage is the stroke advantage, the 15 inches or so will not make two hoots in hell in a river boat.
    Just a thought.
    Wags
    Taking a block to the max overbore has always been a pet peeve of mine. In class racing, sure. In pleasure, even bracket drag stuff...why?
    I always think the guys that bore a new dart block to 4.6 are fools. If you really need the extra cubic inches, do it in stroke. The lever advantage will gain much more.


    BTW, I practice what I preach. I got a new dart block for the PE boat and just made it a 4.280 bore. Sure, I am sacrificing a little airflow. That is what the blower is for. It will last me until I quit drag racing. Blow it up, quit again, etc. I could then take it to 4.5 and it be a perfect piece, and still have value. Power is not a problem with a blown PE piece.
    Last edited by wagspe208; 03-11-2009 at 08:22 AM.

  8. #6
    Senior Member
    Join Date
    Dec 2007
    Location
    Tri-Cities, TN
    Posts
    1,681

    Default

    Quote Originally Posted by wagspe208 View Post
    How about not boring it .100 over, sacrificing the 15 cubic inches, and saving 60 pounds of weight.
    The real advantage is the stroke advantage, the 15 inches or so will not make two hoots in hell in a river boat.
    Just a thought.
    Wags
    Taking a block to the max overbore has always been a pet peeve of mine. In class racing, sure. In pleasure, even bracket drag stuff...why?
    I always think the guys that bore a new dart block to 4.6 are fools. If you really need the extra cubic inches, do it in stroke. The lever advantage will gain much more.


    BTW, I practice what I preach. I got a new dart block for the PE boat and just made it a 4.280 bore. Sure, I am sacrificing a little airflow. That is what the blower is for. It will last me until I quit drag racing. Blow it up, quit again, etc. I could then take it to 4.5 and it be a perfect piece, and still have value. Power is not a problem with a blown PE piece.


    I agree, from a 496 to 505 your gaining 9 CID. A bada$$ engine makes 2HP per cube so at that your gaining 18HP. To me its not worth the weight nor piece of mind.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

  9. #7
    Super Moderator HammerDown's Avatar
    Join Date
    Dec 2007
    Location
    The Right Coast/SE-PA
    Posts
    5,488

    Thumbs up

    Nuff said, and as usual...great feedback!
    My current hole .060 is a little sloppy to reuse so, a .070 over slug it will have to be .
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  10. #8
    Senior Member
    Join Date
    Feb 2008
    Location
    Avondale,AZ.
    Posts
    302

    Default

    Unless core shifted, any 70s or early 80s BBC will go .125"+ without fill. ANY fill will increase oil temp because the bottom of the cylinders are a great oil heat sink. Much larger in area than most oil coolers if you factor the main caps and everything in the bottom end runs cooler than the oil unless filled. The cubic inch diference is not the main issue in gaining performance, the valve unshrouding is. Notice that the chamber is wider than the cylinder under the valves. We notch this area to just above the ring travel to aid in flow. Many BBC larger heads will not flow any more cfm ON AN ENGINE with a 4.280 bore than smaller heads! Back to the question: bore it to 4.375 and bore notch the deck, don't fill it at all. Sonic check the block if you are paranoid, and remember that we have taken these blocks to 4.400 on a regular basis, so the cubic inch gain is larger and at .125 you still have bore left to go. BBC blocks are cheap, why worry about the max bore?
    Mine is not the only valid opinion. The above is solely MY opinion based on 38+ years in the business, we are still here. Make yourself happy... TIMINATOR
    MODESTY IS A CRUTCH FOR THE INCOMPETENT!

  11. #9
    mo balls than $cents$ IMPATIENT 1's Avatar
    Join Date
    Dec 2007
    Location
    hugo,okla
    Posts
    11,733

    Default

    Quote Originally Posted by TIMINATOR View Post
    Unless core shifted, any 70s or early 80s BBC will go .125"+ without fill. ANY fill will increase oil temp because the bottom of the cylinders are a great oil heat sink. Much larger in area than most oil coolers if you factor the main caps and everything in the bottom end runs cooler than the oil unless filled. The cubic inch diference is not the main issue in gaining performance, the valve unshrouding is. Notice that the chamber is wider than the cylinder under the valves. We notch this area to just above the ring travel to aid in flow. Many BBC larger heads will not flow any more cfm ON AN ENGINE with a 4.280 bore than smaller heads! Back to the question: bore it to 4.375 and bore notch the deck, don't fill it at all. Sonic check the block if you are paranoid, and remember that we have taken these blocks to 4.400 on a regular basis, so the cubic inch gain is larger and at .125 you still have bore left to go. BBC blocks are cheap, why worry about the max bore?
    Mine is not the only valid opinion. The above is solely MY opinion based on 38+ years in the business, we are still here. Make yourself happy... TIMINATOR

    if it passes sonic testing, 505 sure has a better ring to it than a 496 i wanted 500+ cubes when i built mine and i used a block that had plenty of meat left over at 100 over.

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  12. #10
    Senior Member hotbo's Avatar
    Join Date
    Feb 2008
    Location
    lake Ouachita AR
    Posts
    4,677

    Default

    ole mans is a 505 alsowe have also seen 125 overbore on other boat mills before.not a problem and im with tom i like 505 better than 496,lol!!!!

  13. #11
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Why not build a 496 and lie come on, you know all of you have told bigger ones than that. Does anyone know what the weight diff is between block fill and the water it replaced. Bet it's not much.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  14. #12
    mo balls than $cents$ IMPATIENT 1's Avatar
    Join Date
    Dec 2007
    Location
    hugo,okla
    Posts
    11,733

    Default

    Quote Originally Posted by gn7 View Post
    Why not build a 496 and lie come on, you know all of you have told bigger ones than that. Does anyone know what the weight diff is between block fill and the water it replaced. Bet it's not much.
    water weighs 7lbs a gallon and shipped weight of 4 empty moroso gallon jugs/shipping box weighed 40lbs. you fill the gallon jugs up so i'd say it took 3.6 gallons at 7lbs a gallon plus the 40lbs of filler it took to half fill the twin turbo 496 block 2wks ago.

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  15. #13
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by IMPATIENT 1 View Post
    water weighs 7lbs a gallon and shipped weight of 4 empty moroso gallon jugs/shipping box weighed 40lbs. you fill the gallon jugs up so i'd say it took 3.6 gallons at 7lbs a gallon plus the 40lbs of filler it took to half fill the twin turbo 496 block 2wks ago.
    I seriouly doubt those jugs weigh 10lbs, a whole bag of that stuff only weighs 50, never the less, don't count the water you put in it, it's not there after it sets up. The weight in your block is the same as dry in the jug



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  16. #14
    I'm No Expert Shaun's Avatar
    Join Date
    Feb 2008
    Location
    San Clemente, Ca
    Posts
    3,139

    Default

    why take any more life from the block then u have to??? I just went from 60 to 70 on my deal.

+ Reply to Thread
Page 1 of 4 1 2 3 4 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95