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Author Topic:   HEY HENDREN'S oil pressure
fast19
Member
posted May 01, 2002 04:16 PM
There are a number of different reason's that you oil pressure could be dropping . Your idle oil pressure would be common with 280 degree oil . I would be a little concerned though with your high oil temp . There are too many different variables , and I really don't have enough info on your engine to give you a good educated opinion on your loss of oil pressure . Perhaps you can give me a call at work and I could ask some questions that would shed some light on your problem . I'd be happy to help out , and feel free to call me at any time of the day , 8:30am - 5:30pm Eastern time .

The 10 lbs per 1,000 rpm is an old theory . On most modern race engines , oil pressure is run much lower than 10 lbs per 1,000 rpm . I'd say if you were running a steady 50lbs all the way around the track , then I would not worry . But dropping from 60 to 45 as you accelerate , could be a problem .

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


ryan
Member
posted May 02, 2002 12:40 AM
Just out of curiousity how high of oil pressure is acceptable


birdcage
Member
posted May 02, 2002 05:51 AM
birdcage ,

No , I've never had any problems with the Dart blocks . I'm assuming your speaking about the Little M block ? I've got a lot of Little M's running as wet sump engines , and have had no problem's with oil returning to the pan .

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


sdhnc29
Member
posted May 02, 2002 10:29 PM
ryan ,

Much above 65-70lbs is excessive .

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


birdcage
Member
posted May 03, 2002 04:33 AM
I actually only use the Dart aluminum block as a dry sump engine . But yes , you would definitely have to make provisions to get oil back in the pan if you ran it as a wet sump .

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


birdcage
Member
posted May 04, 2002 03:04 AM
fast19 ,

It sounds now like you have a oil temp problem more than anything . Your oil pressure when cold , is normal . Your oil pressure with 280 degree oil would also be normal for such hot oil . The 4" stroke crank will not make an oil temp. difference . However , if you are restricting your oil to the top end , and are running a high lift cam , such as a roller or a radical flat tappet , then the temp from the valve train will heat up your oil . Also , depending on the type of head your using , and how much timing your running , you could be heating up your piston's enough to run your oil temp up . I would definitely open up your lifter valley return's also . If your running restrictor's , take them out and get the oil to your valve train . I assume that your running a good oil pan such as a Canton or a Competition Components , that will give you excellent oil control in the pan . If you are using a good pan , and not a Moroso or some other inexpensive Taiwan pan , then you can probably eliminate the pan as a source of your oil temp problem .

Realistically , if your using a high volume big block or small block oil pump , and your oil temp is down around 220 or so , then your high rpm oil pressure should be around 55-60 lbs or so . This would be normal . I think that all of your existing problems are coming from your high oil temp . if you fix the oil temp problem , then I think your oil pressure will be normal .19

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


fast19
Member
posted May 07, 2002 03:33 PM
Thanks Steve,
Lets see if I read you right, removing the oil restricters and opening the lifter valley holes would help the oil temp? I do have a roller cam and the engine block is GM and Dart heads are iron. Oil pans have varied from Canton to several others, all good quality US companies-no economy type. The pistons had run a bit hotter than I like to see but showed no damage.

Thanks again,
19


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