So the purpose of removing the block mounted pressure relief is to stop it sticking in the fully open position?
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Das Beast: My E30 track / street build
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89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Yeah. I've read a lot of threads here, over at E30 Tech (before it died) and on Spec30 about oil problems. You were on some of them. The pressure relief valve failing seems to be a common theme. Getting rid of it means one less thing to break."And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"
1987 E30 3L Turbo Stroker Das Beast
2002 E39 M5
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Machinist used a fancy CNC to cut the seats, so we're fine. Lapping was more a placebo than mechanical requirement.
My cage builder is an Artiste. She won't be rushed. Kind of like the Soup Nazi. "Cage is ready when cage is ready." :devil:"And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"
1987 E30 3L Turbo Stroker Das Beast
2002 E39 M5
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Turbo Time
Working on the downpipe design now. Seems to me this should be a stock item for RSI exhaust manifolds and an M20 engine. If anyone is interested in a group buy, PM me.
Here's the manifold, turbo and waste gate test fitted. Going to make some CAD drawings from this view. No laughing at my ghetto temporary turbo bolts.
Notice how the turbo exhaust is angled UP? That's unexpected. Unless the M20 engine sits at an angle in the car. Anyone know offhand?
Here's a top view. Notice how the turbo exhaust is angled towards the engine. Didn't expect that either.
Turbo outlet is a V-flange, flat, 3-5/8" lip, 3" ID. This is different from others I've seen with a secondary male or female inside lip. Good to know.
Final bit tonight ... permanent heater core delete. Here are the parts. Modified head fitting (chopped and filled with JB Weld), fabricated sheet metal backing and stock sealing gasket.
Installed on the head.
"And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"
1987 E30 3L Turbo Stroker Das Beast
2002 E39 M5
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Originally posted by moatilliatta View PostProperly cut valve seats don't need lapped in, and should not be lapped in.
in the case here lapping them wont hurt anything as they were recut first, as long as all the grit was removed properly its not an issueLast edited by digger; 08-22-2016, 08:05 PM.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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I'm with digger on lapping. My machinist says I don't need to but I've never heard it said you shouldn't.Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com
https://www.r3vlimited.com/board/sho...86#post4944786
Alice the Time Capsule
http://www.r3vlimited.com/board/showthread.php?t=360504
87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220
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Originally posted by staysideways View PostI did the same thing with my oil pump but I was wondering if there will be a noticeable difference because the hole that the pump sucks in from remains the same.
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I don't know about the pressure relief delete mod. That sounds like a bad idea. If you start this up on a cold morning you could crack a cam journal in the head with the excess pressure of the extra viscous oil. I'm not sure how much pressure will build, but I know my gauge sits at 60psi when the engine is cold. You can shut down an engine if you get low oil pressure, you can't avoid too much oil pressure until it grenades. Again, the engineers were concerned about something breaking enough to install a pressure relief valve.
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it doesn't hurt to blend transitions as these make the aperture act smaller than it really is. MM do this with their blue printed oil pumps
In theory you could make a smaller intermediate shaft gear to spin the pump slighty faster it wouldn't be hard to design one but youd be limited by the amount of adjustment in the timing belt tensionerLast edited by digger; 08-24-2016, 03:31 PM.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Originally posted by peterman View PostI'm not sure how much pressure will build, but I know my gauge sits at 60psi when the engine is cold. You can shut down an engine if you get low oil pressure, you can't avoid too much oil pressure until it grenades. Again, the engineers were concerned about something breaking enough to install a pressure relief valve."And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"
1987 E30 3L Turbo Stroker Das Beast
2002 E39 M5
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Originally posted by dvallis View PostThere are two pressure relief valves: one in the block, one in the pump. I'm deleting the block valve and modifying the oil pump pressure relief valve to open at ~75 psi. Same result but one less thing to break.Last edited by peterman; 08-25-2016, 06:41 AM.
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Final numbers on the oil pump replacement spring:
Toyota 9008050248 ~$2
Outside diameter: 0.890" (-0.055)
Free length: 1.825" (+0.132)
Installed height: 1.350" (+0.051)
Rate: 120 lbs/in
Seat pressure: 46 lbs
Calculated oil pressure (cold): 75 psi
New spring and tester arrived today. Will check it out and post results."And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"
1987 E30 3L Turbo Stroker Das Beast
2002 E39 M5
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Originally posted by dvallis View PostFinal numbers on the oil pump replacement spring:
Toyota 9008050248 ~$2
Outside diameter: 0.890" (-0.055)
Free length: 1.825" (+0.132)
Installed height: 1.350" (+0.051)
Rate: 120 lbs/in
Seat pressure: 46 lbs
Calculated oil pressure (cold): 75 psi
New spring and tester arrived today. Will check it out and post results.
(1.825 - 1.35)inĂ— 120lbs/in = 57 lbs
Unless I'm missing something...
What's the diameter of the working part of the valve?
Looks to be about 22mm-ish in which case -
Thats a surface area of .589"^2
75lbs/in^2 * .589"^2 = 44lbs of force to get the valve to open.
A more exact dimension on the valve diameter will yield more exact results, obviously.
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