David Pozzi, Changing pressure on p/s pump - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

 
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post #1 of 6 (permalink) Old Aug 11th, 03, 12:59 PM Thread Starter
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Hi David,

I've seen the back of these p/s pumps now so I know a little more to discuss this now. Below is a pic of the valve assembly and fitting. As you can see I numbered them to cutdown on confusion. The way I understand it you don't do anything to #1 the fitting? #2 the valve asm. gets a larger hole max .140 drilled in it where I have the letter C marking it or does it get drilled in the hole lettered B? Or am I completely wrong and it's the A hole that gets drilled (pun intended) Where is the shim located that needs to be removed and how many shims are usually on these pumps? Thanks


1967 Camaro coupe Deluxe interior LT-1 350 w/ 4spd. M-21 trans and 12 bolt rear.


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post #2 of 6 (permalink) Old Aug 11th, 03, 05:54 PM
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None of the above.
The .140" hole is drilled in the center bore of the #1 outlet fitting. Don't drill anything else.
This is a carefully engineered flow and pressure control valve.

Don't mess with removing the washer under the "nut" in #2, some have two washers and removing one will boost pressure, but yours has only one allready and may have enough pressure as-is.
David

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post #3 of 6 (permalink) Old Aug 11th, 03, 06:53 PM Thread Starter
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Hey David,

Sorry for the miss info here but this isn't my valve setup I got this from archives off Chevelle Tech. I think I understand now what you mean so if the pump I get whether it's new or used has more than one washer behind that nut on part #2 I remove one of them. Then on part #1 I drill the center out larger. How deep should I go into the fitting on #1 up to the hole I lettered A or til it bottoms out? I did think that it might be in the center where it gets drilled but it looked to me to be bigger than .140 there all ready but it's hard to tell from a picture. Thanks

1967 Camaro coupe Deluxe interior LT-1 350 w/ 4spd. M-21 trans and 12 bolt rear.


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post #4 of 6 (permalink) Old Aug 12th, 03, 09:55 AM
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The restriction is just before the small side hole, there is a taper inside, it get's smaller as it goes, drill out the smallest part to .140".
David

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post #5 of 6 (permalink) Old Aug 12th, 03, 03:22 PM
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David,
If i have poor steering feel, could i add a washer or two under the nut on part #2 to reduce the pressure? What would you recommend for an incremental thickness of these shims?

Thanks,
Eugene

Aka Eugene<br />68SS350
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post #6 of 6 (permalink) Old Aug 12th, 03, 05:43 PM Thread Starter
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David,

I do believe I got it now. Thank you

[img]graemlins/thumbsup.gif[/img]

1967 Camaro coupe Deluxe interior LT-1 350 w/ 4spd. M-21 trans and 12 bolt rear.


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