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03-03-2014, 05:37 PM #361
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03-05-2014, 07:49 AM #362
.030 will work, ordered the piston yesterday, and hopefully will have it back together by next weekend. i am still kind of surprised how much more fuel this intake requires.
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03-05-2014, 07:58 AM #363
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03-05-2014, 08:08 AM #364
I have a hard time believing that it's really 3x the air. I think that the reed blocks are a restriction.
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03-05-2014, 08:12 AM #365
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03-05-2014, 08:19 AM #366
Correct on 3X the air, that's why I said "Approx"......LOL.
I had it figured out at one time by calculating the total sq in opening in the down draft vs the 3 horn MAD and it was better than 2.5X the size. You are also correct in stating that the reeds are the restriction, but you also have to consider that it's "Vacuum" and not pressure that's sucking in the air and vacuum is a very powerful force that can over come restrictions to a point more so than pressure. All I can tell you is that running the motor till it dead heads at 85 MPH with the cowl off and using a spray bottle, spraying fuel into the horns it picks up and goes for that instant of the extra fuel sprayed, that's a fact.
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03-05-2014, 11:30 AM #367
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03-05-2014, 02:38 PM #368
At the rpm it was at not up to the point of the Reed cages being a restriction. Torque output was definitely up, and the modified cages in this engine flow a lil more then 10% over what the stock 300x cages flow.
A
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03-31-2014, 06:24 AM #369
ported the engine a lil further, had the one hole punched .030, have new piston on hand. if figured while it was apart i might as well rering it. took all the rings off, put the pistons in the parts washer and as i was bring ing them back to the bench a locating pin fell out in my hand! i guess maybe it was a good thing this motor came apart when it did. i checked all the pistons and it looks like there maybe 1 more with a loose pin. thing only had 250 hours on the pistons! i'm ordering a new set today.
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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03-31-2014, 06:34 AM #3705000 RPM
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Any pics of porting/stuffing etc you've done?
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03-31-2014, 10:01 AM #371
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03-31-2014, 01:07 PM #372
They are vertex
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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03-31-2014, 01:11 PM #373
Good thing you found the loose pins. So all new piston now?
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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03-31-2014, 06:07 PM #374
I guess at this point the pistons are a 250 hour change out part. Ordered another set of vertex. My machinist said he could top pin a set but what would I do for rings? He can modify the rings but I need a set that don't have grooves cut in them so we can groove them after the fact. Wiseco pistons were suggested but I've never had good luck with them in a mercury but supposedly the pins don't come loose.
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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03-31-2014, 08:13 PM #375
Ha Ha the Wiseco thing, some like them some not. I have had good luck myself, always done the full heat soak thing at least 6 times when new and had good luck. A buddy told me the newer ones tend to expand less the first few runs and let you run them a bit tighter from day one without the worry of seizure. I don't know but he builds a ton of 2 strokes.
To each his own, Best of Luck Next go around.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"