oil pressure gauge flutter
#2823723
09/22/20 05:32 PM
09/22/20 05:32 PM
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Joined: Mar 2009
Posts: 2,457
Sydney,Australia
tex013
OP
top fuel
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OP
top fuel
Joined: Mar 2009
Posts: 2,457
Sydney,Australia
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just recently noticed when motor is hot above 45psi / 2600rpm there is a slight flutter/buzz of the gauge . Not much maybe 2-5 psi . Autometer mechanical gauge with i think a -6 braided line
No problem cold . No problem at idle hot or on deceleration .
I noticed it , then oil and filter change as was due , still there .
I use RP 20/50 and use K&N HP filter .
I split the old filter , no jewellry .
I will pull the relief valve later this week and check its not sticky .
Its a World block , flat tappet cam
Can maybe try a different filter , maybe a Baldwin B2 ?
What are your thoughts ?
Tex
New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive
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Re: oil pressure gauge flutter
[Re: tex013]
#2825251
09/26/20 10:31 AM
09/26/20 10:31 AM
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Joined: Aug 2003
Posts: 4,670
On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,670
On the parachute mount
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just recently noticed when motor is hot above 45psi / 2600rpm there is a slight flutter/buzz of the gauge . Not much maybe 2-5 psi . Autometer mechanical gauge with i think a -6 braided line
No problem cold . No problem at idle hot or on deceleration .
I noticed it , then oil and filter change as was due , still there .
I use RP 20/50 and use K&N HP filter .
I split the old filter , no jewellry .
I will pull the relief valve later this week and check its not sticky .
Its a World block , flat tappet cam
Can maybe try a different filter , maybe a Baldwin B2 ?
What are your thoughts ?
Tex Is that a typo ? -6 is a big line for a gauge. -4 or -3 will smooth out the gauge. If you are using -6 it will make the gauge much more responsive, but if thats the case why the worry?? 2-5psi is not a big swing and it really is happening anyway, you just wouldnt notice it with the smaller dia line.
....BAD A$$ STREET CAR.....
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Re: oil pressure gauge flutter
[Re: n20mstr]
#2825286
09/26/20 12:14 PM
09/26/20 12:14 PM
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Joined: Dec 2005
Posts: 11,497
Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,497
Fulton County, PA
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-3 on my mechanical pressure gauges. Always.
If the results don't match the theory, change the theory.
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Re: oil pressure gauge flutter
[Re: n20mstr]
#2825515
09/27/20 01:02 AM
09/27/20 01:02 AM
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Joined: Mar 2009
Posts: 2,457
Sydney,Australia
tex013
OP
top fuel
|
OP
top fuel
Joined: Mar 2009
Posts: 2,457
Sydney,Australia
|
Is that a typo ? -6 is a big line for a gauge. -4 or -3 will smooth out the gauge. If you are using -6 it will make the gauge much more responsive, but if thats the case why the worry?? 2-5psi is not a big swing and it really is happening anyway, you just wouldnt notice it with the smaller dia line. [/quote]
DUH , its a -3 or -4 . Sorry about that .
Thanks guys
Tex
New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive
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Re: oil pressure gauge flutter
[Re: tex013]
#2825611
09/27/20 12:21 PM
09/27/20 12:21 PM
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Joined: Dec 2005
Posts: 11,497
Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,497
Fulton County, PA
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-3 is more responsive to changes. Tells you what is really happening. Less oil to dampen the signal between the source and the gauge.
If the results don't match the theory, change the theory.
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Re: oil pressure gauge flutter
[Re: CMcAllister]
#2825627
09/27/20 12:47 PM
09/27/20 12:47 PM
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Joined: Aug 2003
Posts: 43,097
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,097
Bend,OR USA
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I switch one of my bracket cars to a 1/4 inch oil pressure line from the standard 1/16 or 1/8 (CRS) with the same gauge, the bigger line made the gauge a lot more responsive to the oil pressure changes  It changed with RPM just like the tach did  NHRA outlaw the bigger line shortly after I made that change  I never changed it and was never question by 8 or 9 different track NHRA techs about it either
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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