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View Poll Results: What are the best plenum gaskets? | |||
OEM |
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2 | 8.00% |
Jerry's Gasket 1/32'' |
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5 | 20.00% |
Jerry's Gasket 3/64'' |
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15 | 60.00% |
Jerry's Gasket "early color" (gold) |
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3 | 12.00% |
Voters: 25. You may not vote on this poll |
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#1 |
Join Date: Aug 2014
Location: Trois-Rivieres (QC)
Posts: 473
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Hi,
'91 ZR-1. There's 4 different plenum gaskets available for the ZR-1. 4... I'm a bit lost now. Which gaskets are THE BEST? Last edited by MuRCieLaGo; 01-27-2016 at 10:40 PM. |
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#2 |
![]() Join Date: May 2005
Location: Georgia Mountains
Posts: 926
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Poll notwithstanding ... why don't you contact Jerry directly? He is one of the most stand-up guys in the entire ZR-1 community, is a ZR-1 owner, and, recognizing the need for quality parts for our cars, has stepped in and developed those very parts.
I'm sure if you ask Jerry the differences of the plenum gaskets listed in your poll as well as any other gaskets that might be available, you will get a straight answer so that you can make a decision on what's best for your needs. |
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#3 |
Join Date: Aug 2014
Location: Trois-Rivieres (QC)
Posts: 473
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I didn't want to bug him that's why, and I thought the information would be useful for ZR-1 owners, we will all need plenum gaskets at some point...
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#4 |
Join Date: May 2013
Location: Chicago
Posts: 978
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The thicker gasket with extra material is "suppose to" help block heat transfer to the upper plenum, especially with the coolant bypass.
Anyone know if they make those a/o engineering or who ever it was, upper plenum spacers?
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1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black *Sold* 1985 L98 Blue On Blue *Sold* |
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#5 |
![]() Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,384
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Plenum Gasket Comparison
OEM: Good choice if the plenum & injector housings have not been ported. If the engine is ported, gaskets will require extensive hand cutting to enlarge & match to ports. Value is not so good as evidenced by eBay listings today: 1 single gasket @ $59.99, Set of 2 gaskets @ $189.96 1 single gasket @ $97.81 Jerrys Gaskets 1/32" $23.50/set http://www.jerrysgaskets.com/gasket-...32-90-95-11d2/ This is our basic plenum gasket which can be used on both stock, un-ported engines and also on ported engines up to 37.5mm. Precision die-cut tooling, dimensioned from actual engine drawings, not copied from a gasket. This is our highest selling plenum gasket Jerrys Gaskets 3/64" "50%Thicker" $28.50/set http://www.jerrysgaskets.com/gasket-...64-90-95-11d3/ Cut with the same tooling and gasket material as the standard 1/32" gasket, just thicker. The reason behind this plenum gasket was aid in sealing the plenum/injector housing interface on engines having some degree off damage to the surfaces, such as warpage or stray tool marks from porting. The gasket material has 12~20% compressibility. Essentially, this means the gasket will conform to mating surface irregularities up to 20% of the gaskets un-compressed thickness. So, for the 1/32" gasket, that is 20% x 0.03125" = .006". For the "50% Thicker" gasket, it's directly proportional to thickness @ .009," While we do not recommend re-using gaskets, many of our customers do so successfully. Being 50% thicker, makes it more resistant to tearing. The "Thicker" gasket continues to gain in popularity and is not far behind the standard plenum gasket. Both 1/32" Standard & 50% thicker Gasket Material: The material we use has a nitrile-butadeine (rubber) binder has very good recovery @ 45% min, meaning it will expand back to much of it's original thickness. Cheap, silicone treated paper gaskets will not do this and do not have a high coefficient of friction to stay in place like our gaskets do. Early Color Gaskets $28.00/set http://www.jerrysgaskets.com/gasket-...or-90-95-11b3/ We have a number of customers who have their ZR-1's judged by NCRS. Some incurred scoring deductions for the dark gray plenum gasket, so we had plenum gaskets produced from a different material which matched the color of the "Early" engines. I don't know where the cutoff actually ocurred, but probably in the 90~92 models. The material used is good material and up to the task, but not as good as our primary choice for LT5 gaskets. General Information Myth: Thicker is better! Not necessarily. Gaskets seal differential pressure. Leakage will occur from high pressure to low pressure. The force(F) against the gasket is directly proportional to the surface area(A) exposed to the differential pressure(P). F = P x A. A simple comparison to a hydraulic press. Given the same pressure of 100psi against a hydraulic ram with a piston size of 2" vs 3", the force exerted by the press is 314 lbs vs 707 lbs. Both the 1/32" standard gasket & the 50% thicker gasket are made from the same gasket material and have the same friction coefficient & clamping force applied. The thinner gasket will be less likely to be forced out of position by differential pressure. What about gasket sealants? We get this question frequently and as you would expect, there are points, counterpoints, personal preference and we have our own. 1. Most important: Mating surfaces should be carefully cleaned of all old gasket material and then wiped down with a no-residue cleaner. We recommend cheap, spray brake cleaner. Spray it on a rag & wipe the surfaces clean before installing the gasket. This makes for better retention of the gasket. 2. Sealants: In the vast majority of applications, I do not recommend the use of sealants with our gaskets. If the surfaces are undamaged, properly cleaned, and the components properly assembled, our gaskets do not need sealants. The nitrile butadiene (rubber) binder will hold it in place. There is one exception, and that is for ported engines at the injector housing/cylinder head interface, around the cooling port between the front two cylinders on both banks. There is very little left of the surface between the cooling port & intake runners. At operating conditions the differential pressure is very high (16psi coolant + up to 20" vacuum intake port). As added insurance, the use of an adhesive/sealant like Permatex is recommended. Apply only a very thin film, just around the coolant port, to both sides of the gasket. I hope this answers most of your questions. Ask away if questions remain.
__________________
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. Last edited by A26B; 01-28-2016 at 05:40 PM. |
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#6 |
![]() Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,374
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Nice write up Jerry. Great info.
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#7 |
![]() ![]() Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,794
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Jerry......... Did you say Permatex?
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#8 |
![]() Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,384
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I'm still choking on that a little. Wouldn't you know Mr Permatex hisself would notice that! Don't you dip chips in the stuff?
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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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#9 |
![]() ![]() ![]() Join Date: May 2007
Location: Peoria, AZ
Posts: 9,154
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Jerry's thicker gaskets 3/64th as you can reuse em. End of debate. GC
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__________________
GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director ![]() 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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#10 |
Join Date: Aug 2014
Location: Trois-Rivieres (QC)
Posts: 473
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Thanks a lot for the complete answer Jerry! I'll try the 3/64'' for now. Will order soon.
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