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Join Date: Jun 2009
Location: Iowa
Posts: 443
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oil squirters question
Are oil squirter's really necessary? I was going to bore a 2.2L to 90mm without installing oil squirter's. Is this a mistake? The 2.2L ran great with no overheating of the pistons. (ran it hard but only a street car) and will stay a street car.
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11-02-2010, 04:42 AM
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Location: Mount Airy, MD
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Answering this is a toss up depending on who you ask. The question aside from heat rejection is if the nickel silicon carbide coating requires the extra oil to maintain proper lubrication. There are some that consider this a 'myth' and nickies will do just fine w/o squirters. Your 2.2 are biral and have a cast iron bore. The 2.7s (90 mm) will be nickies... 5 micron silicon carbide particles in a 'glue' of nickel. Avoid acid forming fuel additives... so no nitromethane and no high sulfur fuel (thus no diesels till just now). Other than that propane, ethanol, leaded, you name it.
I've never asked the plating people (US chrome or Millenium) directly. Might ask Charles at LN Engineering as that is his expertiese. Bottom line... why not add them. It isnt that much $$ and you'll want the additional heat rejection. It cant hurt. tadd
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1967 912 with centerlocks… 10 years and still in pieces! |
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11-02-2010, 09:40 AM
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squirters
I understsand that the clearences are setup based on the fact they have them, piston cooling etc.. all benifit from them as well. almost all 911 engines have them except for the early lower HP 2.0 and 2.2
Mike Bruns
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The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago. |
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11-02-2010, 09:56 AM
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Popped an email to millineum. They said you can run nikasil on 'splash only' lubrication but he said forced lube is best. They also mentioned tat the actual plating process has evolved greatly since the 70s, so what might have been necessary might not be as critical.
tadd
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1967 912 with centerlocks… 10 years and still in pieces! |
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11-02-2010, 05:01 PM
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Location: Portland Oregon
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Oil squirters are there primarily to cool the pistons and control thermal expansion. One needs more piston-to-cylinder wall clearance to run without them to prevent piston scuffing when hot.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com Last edited by Steve@Rennsport; 11-03-2010 at 12:45 PM.. |
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11-02-2010, 05:57 PM
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Thanks to all. I was thinking with the crank in line with the pistons oil splash would be high.
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11-03-2010, 06:09 AM
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Max Sluiter
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There will be no oil splash from the crank since it is a dry sump.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
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11-03-2010, 10:24 AM
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squirters
What they mean is all the oil leaving the rod and main brgs. gets slung around.
Mike Bruns
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The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago. |
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11-03-2010, 12:31 PM
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1971 Porsche 911S
