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Just another Wannabe
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Discussion Starter #1
http://www.buzzzmiller.com/bpics2.html
Go down half way on the page to the GN-7 launch. I have seen this before on other boats, but never for as long as this one. How do you go about fixing this problem of not having oil pressure upon the start of a GN race? what would be the best way to cure this?
Accusump engaged at 4 seconds before the gun? Dry sump? I really don't know what all is legal and reasonable for GN racing.
 

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A good oil pan with proper oil control. Too much oil in pan hitting the crank causing aeration? Oil pickup problems, Poor baffling in the pan? trap doors facing the wrong way?(v drive pan)Assuming that is a chevy in there. Usually it is the slowing down problem when oil pressure loss occurs when all the oil rushes towards the front of the pan away from the pickup.
Is there something special about a start of GN race that I'm missing?

edit... dry sump with a ratchet then an electric motor turning the pump before the start
 

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Just another Wannabe
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Discussion Starter #3
The start of a GN race is a dock start type of deal. They shut them off after a warm up and have them held by a crew member right at the shore. They sit side by side, shut off getting ready for the race. Then a countdown to go. Engines cannot be started until the green is dropped. Then when the green is dropped, the engines start and immediate full throttle sprint to the first turn.
 

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Dry sump (everything needs a dry sump) and an accumulator??? It's gonna be hard to have INSTANT oil pressure on anything that sits for a while.......Unless it's fed from an outside source. If weight isn't a BIG issue (there isn't anything that's lighter than nothing!!) I'd probably run one!
Did I mention everything needs a dry sump?
Especialy the enviroment you guys run in! :)sphss
 

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That isn't the head of our very own resident guru in that picture is it??? :))eek:))
Having that much hair at that age is BULLSHIT!!!!!! :|err


:D
 

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Abnormal Member
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Whats up with the 2 coils? Can you switch to the back up if one takes a dump?
There are two coils on the heads but if you follow the wires they lead to a block on the blower and there they are merged together and only one wire to the dizzy.
 

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We have had an accumulator on that deal. And it will most likely be going back in before the next race. Some what due to the starts, but also the turns. I have a photo of the boat in the turn when he past the 790 boat that am trying to get posted, and it is harder to understand how it maintains oil pressure while turning than anywhere else. A drysump is the way to go, and we are currently working on setting one up. But it doesn't help the start situation, only an accumulator will. Also, the pressure line is a -4 and about 12 ft long. The is a 50lb warning lite in front of the driver, with the sender in the main galley. The light goes out before the gauge even moves. We haven't had any bearing failures since 2004 and the accumulator really didn't make much diff in there looks after the races. I thank you for posting the photos. Some people just don't understand what all a GN goes thru in a race. And this is only one of them.



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There are two coils on the heads but if you follow the wires they lead to a block on the blower and there they are merged together and only one wire to the dizzy.
Two MSD boxes on a selector switch(which failed in the sunday race) The thing on the blower is an automatic coil selector. By the next race, one MSD will be triggerd by the dizzy, and one will be triggered by a crank trigger.



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Resident Ford Nut
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What about an accumulator and an external oil pump ? Not as expensive as a wet sump and controlled oil pressure.



Even with a Dooley pan the 565 has had near instant oil psi at start-up. The Stephs pan has an extra little sump around the pick-up tube.

S CP :D
 
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