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01-01-2011 | #1 | |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,135
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Re: Oil in injector housing?
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if it is an issues I need to get the older IH back on it
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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01-01-2011 | #2 | |||||
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,374
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Re: Oil in injector housing?
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I'm sure it wasn't theoretical. There were significant problems with crancase pressure in the LT5 during development. As such, you see some unusual crankcase ventilation parts on the LT5, compared to a typical engine. The big holes in the 90MY heads were enough to precipitate a design change to install restrictor baffles (washers in the 90 model injector housings. Nothing theoretical about it, just too much oil in the intake via the PCV system. Quote:
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2. Originally (for 1990 MY), the heads were machined out to 3/4". 3. Testing resulted in too much oil in the PCV system,so restrictor/baffles were added to the 90MY injector housings as a fix. 4. Greg VanDeventer said " hey, why are we opening up a big hole in the cyl head and then making a small hole restrictor/baffle to install in the injector housing? Why not save a few unnecessary steps and some bucks by just opening the heads up with a small hole for ventilation & leave the injector housings alone, with no baffle? So, for 1991 & later, heads have small hole & it was not necessary to make & install baffle washers in the injector housings. Quote:
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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12-27-2011 | #3 |
Join Date: Sep 2010
Location: Currituck, NC
Posts: 246
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Re: Oil in injector housing?
I'm currently in the process of removing the secondary vacuum system from my wife's 91. I removed everything yesterday and had a good bit of oil in the IH, PCV lines, and Plenum. I have a catch can from Elite on the way and hope that takes care of the Plenum. I was surprised to see it had IH and Heads as pictured for the 90 MY. My guess is most of the early 91's got 90 parts installed.
Last edited by Shrek; 01-17-2012 at 09:13 AM. |
01-16-2012 | #4 |
Join Date: Feb 2009
Location: Alexandria, Virginia
Posts: 1,469
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Re: Oil in injector housing?
Looks like I will be doing this operation....I bought some injector housings from what I was told was a 90 car..OPPS. They are 91 injector housings, now that they have been ported, I guess I need to get some plugs and try my hand at plugging these things up .
Rich
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1990 Bright Red Coupe #608 380 Stroker, Ported Heads/Intake/Housings/TB Haibeck Secondary Delete Chip / Pete's Cams George Braml Intake / FIC Injectors Coated SW Headers / Corsa Bill Boudreau B/B ZF6 / Viper 4.10 gears Ron Davis Radiator Pioneer AVIC-Z140BH NAV Fikse FM5's 285 / 335 / C6 Brakes WAZOO Member |
12-06-2010 | #5 |
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,374
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Re: Oil in injector housing?
Good on the B & D match. Just making sure.
Is this the engine that is in the 90 you put RC injectors in last year? I don't think the catch can is the solution to your emissions problem, but others may be able to address the emissions/catch can situation from experience. Have you checked the PCV valve hoses, lower & upper to be sure they are not leaking vacuum?
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
12-06-2010 | #6 |
Join Date: Jan 2006
Location: Temecula, CA
Posts: 92
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Re: Oil in injector housing?
Thanks for the info, Jerry!!!
This is the engine I put new RC injectors in several years ago, 2007 I think. I have checked both the upper and lower pvc hoses (they are new silicone hoses w/stainless clamps sealing the ends and the pvc valves). Anyone want to share opinions on passing CA smog? |
01-01-2011 | #7 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,135
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Re: Oil in injector housing?
Thanks Jerry.. now I understand I could plug the holes of my late IH too right? are all 3 open currently? your one pic blocks the 3rd. if I have to do that now is the time for me since it is winter and I need to pull the plenum to swap the AC compressor.. what is a few more bolts and a set of gaskets.
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
01-01-2011 | #8 | ||
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,374
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Re: Oil in injector housing?
Quote:
Quote:
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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01-01-2011 | #9 | |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,135
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Re: Oil in injector housing?
Quote:
Yes by plug I mean restrictor/ Baffle although 2 are baffles 1 is a Plug correct?
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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01-02-2011 | #10 |
Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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Re: Oil in injector housing?
Okay, I knew if I waited I would not have to start a thread about using late I/H's on 90 heads.
I've tried to find the correct diameter freeze plug that I could insert into the late I/H so I could duplicate the restrictor hole size on the 90 I/H's.....so far no joy in finding a plug that fits the opening. My question would be would it be something that a machinist, Carter, could make from brass so we could drive it into the I/H opening? What size would it have to be? I bought a plenum & I/H set from a 91 motor part out that were ported. I figured I could plug & play with that stuff on my 90 so I jumped.....I should have looked deeper as I didn't know about the PCV restrictor..... Tom Jeff, the hole that is completely "pluged" is the coolant passage in the I/H that exits coolant from the block thru the I/H and then into the tubes.
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member Last edited by tomtom72; 01-02-2011 at 08:06 AM. |
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