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01-09-2020, 04:16 PM #16
Both ECUs have custom chips in them but both have issues. These motors were on offshore mids and were a set of triples on a Skater that was bought from a government auction out of FL.
Last edited by PaulR; 02-25-2020 at 11:33 AM.
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01-09-2020, 05:42 PM #17
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01-11-2020, 04:20 PM #18Junior Member
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there is obviousley an overlap between the exhaust and transfer port through the wrist pin hole on the southern end . i can see a potential power loss in this area.
any high performance gurus out there like to chime in on this?
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01-12-2020, 02:51 PM #19Junior Member
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well thats dissapointing
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01-12-2020, 07:46 PM #20
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01-15-2020, 10:42 AM #21Supporting Vendor
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David - WI, tlwjkw liked this post
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01-16-2020, 12:12 AM #22Junior Member
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thanks chris, do you have any photos on file?thanks
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01-16-2020, 07:20 AM #235000 RPM
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wizard makes an encapsulated pin. pro marine sells them.
http://wizardraceshop.com/index.php/...ht-wrist-pins/
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01-16-2020, 11:27 PM #24
I can only speak for his 3.0L set-up .. Picture this if you will ...
His reed block spacer kit, while adding 4.5cc to the intake side volume, the block displaces double that on the crankcase side.
4.5 x 2 (min) = 9 cc Dyno proven to be worth 7 HP
The kit and more importantly, the installation instructions .. are sound.
A stock 3.0L pin holds 13.5 cc's lightweight versions ... even more.
9 + 13.5 = 22.5 cc total volume displaced from the crankcase .
Now anything is possible when you go on the pump, and your results may vary. But if the trend and the logic that goes with it, holds true. Both kits together should be worth an honest 15 HP.
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01-17-2020, 11:03 AM #255000 RPM
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Chaz,your information on CC reed spacers is very interesting.What do they do to help the performance {how do they work}.Do the spacers work only on stock motors.....Ed
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RBT liked this post
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01-17-2020, 05:00 PM #26
A 3.0L Merc is a half a dozen 500cc motors joined together. Each one has a fairly wide x flat reed block tunnel that looks nothing like a carburetor bore, but does yield itself well to stacking a six pack tightly together. The crankcase lower area, rod slot (choke) and then two pretty well hidden main transfer port windows in the upper crankcase area. Lots of places for fuel / oil droplets to fall out of suspension.
With large areas come slow-moving columns of air. You can still build power with oversize ports and purpose directed port roof angles.
If you look at 500cc class motorcycle crankcases. Compact in size with well placed, easy access transfer windows. Take the plug out, or pull the head and kick it over, the crankcase pressure escaping as the transfer ports open is all business. Get the ports too big and it blows the charge out the exhaust . Make to much pressure and power will go down from heating the air and pumping losses.
Outboards are pretty archaic by design, anytime you can improve column reaction to pressure change , you will make more power. Unless you aim the port roofs up and twords the exhaust outlet. Because unlike the dirt bike, an outboard has no real way to recover a lost charge. Like anything else, it can be pushed to the point of diminishing returns .. but for your basic outboard, you'd have to work real hard to get to that place ... Got crankcase boost ..
I would have never guessed that the "3 exhaust ports" deal would have ever worked without short-circuiting the fresh charge. Once again, the transfer roofs need to be flat and open with authority.
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JR IN JAX, Michael J Giesler liked this post
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01-18-2020, 06:53 AM #2781' HYDROSTREAM VECTOR / slightly Modified 200
before and after:http://www.screamandfly.com/showthre...inished!/page3
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01-18-2020, 08:46 AM #28
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01-18-2020, 04:34 PM #29Supporting Vendor
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give a call,I can fix you up,Chris
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texasvector liked this post
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02-07-2020, 06:19 PM #30
I confirmed today that Alex Hledin built these motors! I've been texting with someone that works with Alex and it turns out they still have parts even though Alex hasn't built a 2.7 in 20 years! I found out that the welding on top of both blocks is because they had to open that area up so they could weld the block in the water cavity because the bigger sleeve went into the water cavity then they welded the block back up. The ECU chip is a custom curve Alex came up with but as RBT said it wasn't reliable. I was told to use a Champ ECU at full rich. The heads are from molds Alex made! The tube at the bottom of the block was put in for strength, they said these can make 400hp+
I'm going to ship both blocks up to Alex, who better to fix them!!!
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