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  1. #31
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    On a side note I put top and bottom rings in and omitted the center ring. I did leak down tests with all 3 it was 93%, with top & middle it was 93%, top & bottom it was 93%, and with only the top ring it was 89%.

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  3. #32
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    What do you figure with 3rings 97+%? Pistons in makes ex ports clean up a no.

  4. #33
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    With all 3 it was the same as just 2 in either position. The theory was the empty second ring groove would work as a accumulator to dampen the shock from ignition.

  5. #34
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    Sure, two is good then. You could always plug each port tight with cotton or something and work the ports. Then turn the block over and pull the plugs out and carefully clean. No don't do that.

  6. #35
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    Biggest problem is getting air/fuel in as the reed block is restricting...We used to thin the blocks and run the timing all the way up till we got blisters on piston eyebrow the back it off a couple of degrees. This was 1/4 runs.....

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  8. #36
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    Annapolis, MD ragboat capital of the world
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    Quote Originally Posted by faztbullet View Post
    Biggest problem is getting air/fuel in as the reed block is restricting...We used to thin the blocks and run the timing all the way up till we got blisters on piston eyebrow the back it off a couple of degrees. This was 1/4 runs.....
    Running the timing up is running it up until you meet the limit of that particular batch of gas. Gas station gas varies from delivery to delivery. If you plan on doing this, either buy a LOT of gas and store it sealed or buy race gas or AV gas and keep it sealed. This is what the inline 6 racers did back in the day ... what the winners did.

    Also, changing props or motor height can change the load on the engine enough to change the way it responds to a particular batch of gas. Running the timing up is the very last thing to do in set up.

  9. #37
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    Clean ex ports without restrictive edges improve efficiency

  10. #38
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    Quote Originally Posted by FMP View Post
    Clean ex ports without restrictive edges improve efficiency
    When there isn't a greater restriction somewhere else.

  11. #39
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    It's not just for flow, it's for a clean signal and incoming tuning pulse which leaves and arrives without extra distortion equally or more important in my opinion. All those bolt heads don't help.

  12. #40
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    I figured I could use a v6 flywheel and mix parts. The engine is on a hydrostream viper, so it's fairly light. Don't care so much about lo end torque, I'm not building it to pull skiers. I figured when I pull it apart I'll go with hi domes, I'm going to try aces additive with premium gas, I've had good luck with 2.5's and 3 litres with 170+ psi compression, so hopefully I can leave some timing in it, worst case I'll blend some avgas into it.
    action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build

  13. #41
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    How will you raise the compression to justify use of jacked up gas?

  14. #42
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    HY sam I milled the back of the reed blocks.the main s and upper and lower mains 10/1000 an the the back of the block. bad side is driveshaft alignment....... D.S. I don't pull my motors apart to check my work they do it them selves when they what to show me the bits parts......

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  16. #43
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    Quote Originally Posted by Mark75H View Post
    How will you raise the compression to justify use of jacked up gas?
    I was going to change the Pistons to high domes. I haven't looked in the book yet but I heard that the 850 pistons fit the 6 as well
    action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build

  17. #44
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    MRCRSR ..... I need help.... 3.0 ... no spark. Dam motor running me in to drinking.... Not that I need help in that.....Will run one day 2 hrs nadda. I willing to put on a L6 dist...that I know....WTF 3.0

  18. #45
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    Or move the centreline of the crank some towards the rear of block and cut the block and case and line hone. Then adjust the ports. What the heck is the term for that?

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