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  1. #16
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    For the pistons... I'm trying to identify similar features on my I6 (Thread: Help Identifying Mercury I6 Tower)

    From all of the reading I have done, it is suggested that the ported piston is used in conjunction with a machined port on the cylinder block. If you look in my thread, I believe that the early distributor 150hp/late ADI 115hp i6 is piston ported and assume that the early distributor 115s were not ported. (I.E. having a piston port/port machined into the cylinder wall.) I have not been able to get a straight answer on this.

    Given this information, to the best of my knowledge, I would assume that if you don't have a port machined into the cylinder wall, then you wouldn't have any reason to use the ported pistons with a notch.... Though I don't think any harm would come out of it...

    What an awesome project... Wish I could find one of those motors for my Viper! Look forward to seeing the results!
    Last edited by NoRdO; 08-06-2017 at 07:10 PM.

  2. #17
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    The notch on the crown will actually make the transfer port open sooner and can cause all sorts of issues in a 2 stroke. The Piston port(hole in the side of the skirt) usually matches up to a machined slot in the cylinder wall, in an engine designed for it.
    Last edited by mrcrsr; 08-07-2017 at 10:19 AM.
    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

  3. #18
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    Correct, the right piston is the one with no hole and no notch.

    The 1970 and 71 135hp and 1970, 71 and 72 115hp will have pistons like the correct pistons in your T2. "Replacement" pistons for the 135 are usually the new style with the notch - just because they fit the bore not because they are truly correct - so you either need a NOS or a good used 135 piston. The hole in the skirt isn't the problem, its the "eyebrow" notch that comes with the hole and the transfer/intake covers for the 140/150 series motors.

  4. #19
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    Quote Originally Posted by mrcrsr View Post
    I'm thinking about assembling the other engine eventually with a standard 115 crank, as I'm sure trying to find a t2 crank would be a lost cause.
    You really need a T2 firing order crank to use the T2 block because the T2 exhaust tuning is specific to the firing order. The best option without a T2 crank is to build up a suitable 150/ADI 115 to accept the second C-6 front. A 150 built up as such will be about 165 hp if done correctly, a std crank in a T2 is probably less than 155hp because the exhaust tuning will be so far off. Might even be a piston burner that won't even run more than a few minutes.

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  6. #20
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    Quote Originally Posted by NoRdO View Post
    For the pistons... I'm trying to identify similar features on my I6 (Thread: Help Identifying Mercury I6 Tower)

    From all of the reading I have done, it is suggested that the ported piston is used in conjunction with a machined port on the cylinder block. If you look in my thread, I believe that the early distributor 150hp/late ADI 115hp i6 is piston ported and assume that the early distributor 115s were not ported. (I.E. having a piston port/port machined into the cylinder wall.) I have not been able to get a straight answer on this.

    Given this information, to the best of my knowledge, I would assume that if you don't have a port machined into the cylinder wall, then you wouldn't have any reason to use the ported pistons with a notch.... Though I don't think any harm would come out of it...

    What an awesome project... Wish I could find one of those motors for my Viper! Look forward to seeing the results!
    It's going on our viper. I met my wife in my first viper which had a v6.
    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

  7. #21
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    Quote Originally Posted by Mark75H View Post
    You really need a T2 firing order crank to use the T2 block because the T2 exhaust tuning is specific to the firing order. The best option without a T2 crank is to build up a suitable 150/ADI 115 to accept the second C-6 front. A 150 built up as such will be about 165 hp if done correctly, a std crank in a T2 is probably less than 155hp because the exhaust tuning will be so far off. Might even be a piston burner that won't even run more than a few minutes.
    Thanks Sam, I am actually trading a 225 optimax block and heads for a complete 1985 115 tomorrow. I was going to use the rods and electrical on the t2.
    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

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  9. #22
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    Quote Originally Posted by Mark75H View Post
    You really need a T2 firing order crank to use the T2 block because the T2 exhaust tuning is specific to the firing order. The best option without a T2 crank is to build up a suitable 150/ADI 115 to accept the second C-6 front. A 150 built up as such will be about 165 hp if done correctly, a std crank in a T2 is probably less than 155hp because the exhaust tuning will be so far off. Might even be a piston burner that won't even run more than a few minutes.
    I was thinking that also that any exhaust tuning was out the window
    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

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  11. #23
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    Thumbs up

    Quote Originally Posted by mrcrsr View Post
    Thanks Sam, I am actually trading a 225 optimax block and heads for a complete 1985 115 tomorrow. I was going to use the rods and electrical on the t2.
    You are on the right path!

  12. #24
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    Do any engines use a high dome 2 ring piston with no power port? I just reread your post Sam and saw the 135 mentioned
    Last edited by mrcrsr; 08-07-2017 at 07:07 AM.
    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. #25
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    Charlie,

    Call Falicon on your crank. They are in Clearwater (727) 797-2468. I have used them on several watercraft, motorcycle, and snowmobile projects over the years. Good guys to deal with and very knowledgeable.

    Joe

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  15. #26
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    I was looking at the Pistons this morning, and putting them in the block. I really don't see a detriment to the Piston port, or it affecting the engine operation. When it gets down to bdc it may allow some fuel/ air that's compressed under the Piston crown to exit directly into the intake port passage. I'll try to get some pictures up tonight. Promarine makes a 2 ring hi dome 115 piston, I'll find out today if it has the port, and if it has a notch.
    Last edited by mrcrsr; 08-07-2017 at 07:08 AM.
    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

  16. #27
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    David Eden....Marine Crankshaft....714-549-2388

    marinecrankshaftinc.com

    Dave is the owner
    Team Junk

    No sparkling wiggles in here, only dump truck grinches.

    "Screamin Heathen"

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  18. #28
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    Just left the Mercury dealer, looked up the 1350 piston, it's still available but appears to be a cross flow piston and not a direct charge pistonClick image for larger version. 

Name:	IMG_20170807_105714.jpg 
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    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

  19. #29
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    Somewhere in the darkest depths I may have some non ported piston.

  20. #30
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    Quote Originally Posted by Capt.Insane-o View Post
    Somewhere in the darkest depths I may have some non ported piston.
    Thanks Lynn
    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

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