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02-11-2004, 11:27 PM
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#21
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The Doc
Join Date: Mar 2004
Posts: 8,283
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just had this from seller:
"Hi Lawrence
The standard comp. for a pro-max is 135 lbs according to Mercury service manual. It probably has high comp. head gasket installed."
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02-11-2004, 11:28 PM
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#22
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hello
Join Date: Mar 2004
Posts: 2,736
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I dunno about 60 thou but I know that 150psi is fine on 95RON unleaded, you dont really wanna take it much more than that though.
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02-11-2004, 11:46 PM
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#23
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The Doc
Join Date: Mar 2004
Posts: 8,283
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Matt,
thats superb....i think i've sorta talked myself into this!!
it may all be imaterial the way the price is going!
I got my maths wrong in the PM btw!
fingers crossed!
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02-11-2004, 11:56 PM
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#24
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hello
Join Date: Mar 2004
Posts: 2,736
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normal unleaded is 95RON
Optimax Super and BP ultimate unleaded are all 97/98RON
150psi will be fine on the standard 95RON unleaded we have over here.
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03-11-2004, 12:04 AM
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#25
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Registered User
Location: Scotland
Interests: Hole maker
Boat make: Humber Ocean Offshore
Engines: KAD 300/DPX
Join Date: Mar 2004
Location: Scotland
Posts: 957
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Quote:
Originally posted by Matt
...It's important to realise detonation is not the same as pre-ignition or pinking. It's similar, but the flame front is still under control, it's not an explosion. ...
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Well yer nearly there...
Preignition is caused by something other than the spark at the plug igniting the mixture prematurely. Pinking is a pressure rise faster than you might want and it is verging on detonation. It may contain a wee explosion within the burn. As you say, detonation is dangerous.
Retarding the ignition timing, to start the burn later and avoid too fast a pressure rise, will be necessary if the compression pressure has been increased.
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JW.
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03-11-2004, 12:18 AM
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#26
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The Doc
Join Date: Mar 2004
Posts: 8,283
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Quote:
Originally posted by Matt
Go with yer gut feeling.
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Erm, thats got me 4 student loans, a girlfriend, an estate car and a couple of nights in a police cell!!! I'll stick with using my brain....what i ahve of one
QUOTE] Originally posted by Matt
you were told the motor is stock, and it clearly isn't. [/QUOTE]
Actually (shame i deleted original emails!!) i was told as far as he was aware it was "as it left jerrys marine in 99"....he does clearly mention in the add "With the compressions, Mercury recommends to use only premium fuel (92 octane or higher)" just bellow where the compression are stated.
also from another perspective buyer:
Q: Hi TX. Is motor original? Any powerhead work done? Has ECM been read by dealer? What oil was used? Who serviced motor? Why are you selling? Thx for your time and help. RoyP
A: Roy - The motor was originally bought from Jerrys Marine in Sulphur, LA. I believe the only defect that this powerhead has had is an intermittent trigger assembly which was replaced. The outboard has been serviced by and stored for approx. 2-1/2 yrs at Taylor Marine in Orange TX. I do not know if they read the computer, but they told me it was in excellent condition. To the best of my knowledge, it has been run on Merc oil and serviced by Taylor Marine. Thanks.. Glenn
the guy also has 500+ positive feedbacks!
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03-11-2004, 12:19 AM
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#27
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hello
Join Date: Mar 2004
Posts: 2,736
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I allways thought that detonation pinking and preingnition where all the same thing. The way I understood it was that the fuel air mix was ignited prematurely and the flame front (energy wave) hit the piston before TDC which is nasty as its trying to push the piston back down whilst its still traveling up, as oposed to after TDC therefore pushing it in the direction its allready traveling in. More octane slows down the flame front thus allowing the piston more time to reach and pass tdc, hence why you can run more ignition advance with more octane. A slower burn will also push the piston for longer and will there for still be pushing when the crank is at a greater angle w.r.t to the conrod and thus give beter leverage and therefore more torque. This is how nitrous works as it has a very slow burn compared to petrol alone
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03-11-2004, 12:33 AM
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#28
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The Doc
Join Date: Mar 2004
Posts: 8,283
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just working that out.................coz if it is........i'm already fecked.....what a dissapointment.
hold of going to bed and i'll let ya know in 5!
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03-11-2004, 12:45 AM
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#29
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The Doc
Join Date: Mar 2004
Posts: 8,283
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not enough burgers!
ta
in answer to question.....i reckon mastercard will let me squeeze a wee bit more than that!
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03-11-2004, 02:15 AM
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#30
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The Doc
Join Date: Mar 2004
Posts: 8,283
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oh well...it exceeded my maximum!
off to bed.....back to drawing board tomorrow
bollix!
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03-11-2004, 08:22 AM
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#31
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Senior Member
Location: the narf
Occupation: give up
Interests: triple rigs
Boat name: which one
Boat make: 25 phantom 26 puma cat,30 pima cat,25 phantom 30 flipper,
Engines: triple 2.5 efis
Cruising area: blackpool prom at dusk
Join Date: Jun 2004
Location: the narf
Posts: 244
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GASKETS
Quote:
Originally posted by Captain Chaos
just had this from seller:
"Hi Lawrence
The standard comp. for a pro-max is 135 lbs according to Mercury service manual. It probably has high comp. head gasket installed."
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must be using rice paper to gain that much psi
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03-11-2004, 09:01 AM
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#32
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,942
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Quote:
Originally posted by Johnny Boat Dude
This is how nitrous works as it has a very slow burn compared to petrol alone
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Nitrous itself doesn't burn at all, the Nitrous, when heated by the ongoing combustion, releases Oxygen, which allows the extra fuel you've intoduced through aditional jets/injectors, to burn.
As the Oxygen is liberated from the Nitrous by the heat of combustion in a fairly controlled manor, it's relatively kind on the motor. I think the process of liberation of Oxygen, cools the charge, which also helps.
At least this is how I understand it.
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03-11-2004, 09:58 AM
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#33
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,942
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Quote:
Originally posted by Matt
one of the google ads is for a Whipped Cream Charger!
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03-11-2004, 03:40 PM
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#34
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hello
Join Date: Mar 2004
Posts: 2,736
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Quote:
Originally posted by Johnson
Nitrous itself doesn't burn at all, the Nitrous, when heated by the ongoing combustion, releases Oxygen, which allows the extra fuel you've intoduced through aditional jets/injectors, to burn.
As the Oxygen is liberated from the Nitrous by the heat of combustion in a fairly controlled manor, it's relatively kind on the motor. I think the process of liberation of Oxygen, cools the charge, which also helps.
At least this is how I understand it.
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So its not a slower burn as such just a longer burn because your burning more fuel?
Also how far off the mark was I with the pinking, pre-ingnition or whatever thing?
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03-11-2004, 06:46 PM
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#35
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,802
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compression
if youre that bothered about the high compression retard your timing a bit, but 150 psi is ok on our premium unleaded.
BTW, if you don't mind me asking, how much were you quoted for shipping for i?
Alan
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05-11-2004, 01:51 AM
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#36
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,802
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2.5 200
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