The Ford Barn

kdoug · 06-17-2010, 12:14 PM

got a 36 Ford with a flatheadV8,when cold i have 40-50lbs of oil pressure but as it worms up pressure will drop to 6lbs.Raise rpm will go to 10lbs,go to higher rpm oil pressure drops more.Bearings look good and cant see anything obvious.

Gary in Mozarks · 06-17-2010, 12:39 PM

Quote:

Originally Posted by kdoug

got a 36 Ford with a flatheadV8,when cold i have 40-50lbs of oil pressure but as it worms up pressure will drop to 6lbs.Raise rpm will go to 10lbs,go to higher rpm oil pressure drops more.Bearings look good and cant see anything obvious.

My first guess would be worn bearings, (cam rods, mains) But I guess it could also be a weak oil pump and/or a weak bypass valve. Are you running straight weight oil? 10w40 would help a little JMO
Gary in MOzarks

ford1 · 06-17-2010, 01:05 PM

gary. 3 places to lose oil pressure, one is the oil pump, yes it does have a pressure relief valve, the second are the cam bearings, alot of times these never get replaced on an engine rebuilt in the car, all oil pressure for the engine starts there after the oil pump sends it there, the other places are the main and rod bearings, plasta gage them to see it the clearances are with in specs

296 V8 · 06-17-2010, 01:05 PM

From the little iv seen
That’s kinda typical oil presser for a older??? Flathead. (seen lower and still run a long time)

I think they lose some presser at the cam bearing (most oil go’s there first)

Related
A friend that builds flathead here locally has addressed this by getting custom cam bearings (one hole)
He cuts groves in cam bores (were the bearing sit) to try and direct more of the oil around the cam. Therefore better oil presser at the crank and less spilling from the cam onto the spinning crank.

So far this setup has only been used in a couple of race motors. But they did make big HP and set some records in blown street roadster.

Walt Dupont--Me. · 06-17-2010, 01:26 PM

Quote:

Originally Posted by kdoug

got a 36 Ford with a flatheadV8,when cold i have 40-50lbs of oil pressure but as it worms up pressure will drop to 6lbs.Raise rpm will go to 10lbs,go to higher rpm oil pressure drops more.Bearings look good and cant see anything obvious.

I'D put in an m-19 oil pump and 20-50 oil it will live forever. Walt

Frank The Plumber · 06-17-2010, 01:44 PM

Sponsored Links (Register now to hide all advertisements)

Most view Walt's word as gospel, I'd go with that.

ford1 · 06-17-2010, 02:59 PM

one strange thing about ford flathead engines ford never stated oil pressure at idle, all the book says is #35 at 35 mph

36tbird · 06-17-2010, 05:20 PM

296, you are a deranged individual! How many of us ol' farts do you want swatting at our monitors to get that bug?! Do you want that on your conscious?! Please take your avatar and my response to the "camaraderie" thread for analysis.

OLD...BILL · 06-17-2010, 06:31 PM

I've spraying bug zapper in the back of my monitor..... ain't worked yet...OLD....BILL

Dennis/Arkansas · 06-17-2010, 07:11 PM

Love 296 V-8's bug. He's got his figure 8 down pat. Now if 296 V-8 could teach him to do the letter "V" it'd be perfect. Dennis/Arkansas

redfor40 · 06-17-2010, 09:31 PM

that thing bugs me too

kdoug · 06-18-2010, 11:37 AM

hi walt thanks for your reply,im gonna try 20-50 and see how it goes

Ross in East Texas · 06-18-2010, 04:28 PM

Does anyone know how to get bug spray off of my monitor? LOL

3340 · 06-18-2010, 06:18 PM

What walt says.

296 V8 · 06-21-2010, 08:17 AM

I tried adding a v but any modifications makes him stop moving.

296 V8 · 06-21-2010, 09:34 PM

Should change to this one?
bet y'all dont swat at her.

Dennis/Arkansas · 06-21-2010, 09:42 PM

You bet! I will miss the bug however. Such is life. Dennis/Arkansas

Quote:

Originally Posted by 296 V8

Should i go to this one? bet y'all dont at swat her.

06-17-2010, 12:14 PM	#1
kdoug Junior Member Join Date: Jun 2010 Posts: 3	where did the oil go? got a 36 Ford with a flatheadV8,when cold i have 40-50lbs of oil pressure but as it worms up pressure will drop to 6lbs.Raise rpm will go to 10lbs,go to higher rpm oil pressure drops more.Bearings look good and cant see anything obvious.

06-17-2010, 01:05 PM	#4
296 V8 BANNED Join Date: May 2010 Location: nor~cal Posts: 455	Re: where did the oil go? From the little iv seen That’s kinda typical oil presser for a older??? Flathead. (seen lower and still run a long time) I think they lose some presser at the cam bearing (most oil go’s there first) Related A friend that builds flathead here locally has addressed this by getting custom cam bearings (one hole) He cuts groves in cam bores (were the bearing sit) to try and direct more of the oil around the cam. Therefore better oil presser at the crank and less spilling from the cam onto the spinning crank. So far this setup has only been used in a couple of race motors. But they did make big HP and set some records in blown street roadster.

06-17-2010, 01:44 PM	#6
Frank The Plumber Senior Member Join Date: May 2010 Posts: 693	Re: where did the oil go? Sponsored Links (Register now to hide all advertisements) Most view Walt's word as gospel, I'd go with that.

06-17-2010, 02:59 PM	#7
ford1 Senior Member Join Date: May 2010 Location: oroville ca. Posts: 1,554	Re: where did the oil go? one strange thing about ford flathead engines ford never stated oil pressure at idle, all the book says is #35 at 35 mph

06-17-2010, 05:20 PM	#8
36tbird Senior Member Join Date: May 2010 Location: nw SanAntonio, TX Posts: 939	Re: where did the oil go? 296, you are a deranged individual! How many of us ol' farts do you want swatting at our monitors to get that bug?! Do you want that on your conscious?! Please take your avatar and my response to the "camaraderie" thread for analysis.

06-17-2010, 01:05 PM	#3
ford1 Senior Member Join Date: May 2010 Location: oroville ca. Posts: 1,554	Re: where did the oil go? gary. 3 places to lose oil pressure, one is the oil pump, yes it does have a pressure relief valve, the second are the cam bearings, alot of times these never get replaced on an engine rebuilt in the car, all oil pressure for the engine starts there after the oil pump sends it there, the other places are the main and rod bearings, plasta gage them to see it the clearances are with in specs

06-17-2010, 06:31 PM	#9
OLD...BILL Senior Member Join Date: May 2010 Location: Northern California,coast Posts: 552	Re: where did the oil go? I've spraying bug zapper in the back of my monitor..... ain't worked yet...OLD....BILL

06-17-2010, 07:11 PM	#10
Dennis/Arkansas Senior Member Join Date: May 2010 Location: Lead Hill, Arkansas Posts: 237	Re: where did the oil go? Love 296 V-8's bug. He's got his figure 8 down pat. Now if 296 V-8 could teach him to do the letter "V" it'd be perfect. Dennis/Arkansas

06-17-2010, 09:31 PM	#11
redfor40 Senior Member Join Date: May 2010 Location: indiana Posts: 99	Re: where did the oil go? that thing bugs me too

06-18-2010, 11:37 AM	#12
kdoug Junior Member Join Date: Jun 2010 Posts: 3	Re: where did the oil go? hi walt thanks for your reply,im gonna try 20-50 and see how it goes

06-18-2010, 04:28 PM	#13
Ross in East Texas Senior Member Join Date: May 2010 Location: Longview, Texas Posts: 282	Re: where did the oil go? Does anyone know how to get bug spray off of my monitor? LOL __________________ Ross Murphy 1939 Ford Standard Coupe

06-18-2010, 06:18 PM	#14
3340 Senior Member Join Date: May 2010 Location: toledo ohio Posts: 393	Re: where did the oil go? What walt says.

06-21-2010, 08:17 AM	#15
296 V8 BANNED Join Date: May 2010 Location: nor~cal Posts: 455	Re: where did the oil go? I tried adding a v but any modifications makes him stop moving.