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08-29-2011
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#1 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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90-92 vs 93-95 IHs
Question was posed to me about fitting 90-92 IHs on a 93-95.....what needs to be changed and is it worth it....I would think the move to 34mm gets you 80%+ of what you get from the 36mm port.
Thoughts?
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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08-29-2011
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#2 |
 
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,394
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Re: 90-92 vs 93-95 IHs
The 90 housings are unique. This thread details the difference.
http://www.zr1.net/forum/showthread....jector+Housing
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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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08-29-2011
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#3 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: 90-92 vs 93-95 IHs
Quote:
=Jeff= has done this conversion. He felt it would be a way of getting the benefit of porting the top end without the porting. In doing the calc for the area of a circle, it comes out to 89% and since the volume of a cylinder is the area x the height, the % holds. Obviously the plenum would need to match the flow. |
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08-29-2011
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#4 | |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: 90-92 vs 93-95 IHs
Quote:
I did 93-95 on a 90-92.. so the opposite of what Lee wants if I read it right I added the plugs to the 93 IH as well to work on my 90. I also have a later model plenum too
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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08-29-2011
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#5 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: 90-92 vs 93-95 IHs
What about fuel injector issues...as in sealing there is a difference, correct?
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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08-29-2011
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#6 | |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: 90-92 vs 93-95 IHs
Quote:
but the 93-95 will work on the 90-92 just remove the o-ring on the bottom of the injector. you cannot use the 90-92 primary injectors on a 93-95 injector housing.
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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08-29-2011
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#7 |
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Join Date: Mar 2009
Location: Orlando, FL
Posts: 1,828
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Re: 90-92 vs 93-95 IHs
What Jeff said.... all correct. I am running 93-95 IHs on my 91.
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2004 Z06/Z16 LeMans Commemorative Edition 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold) |
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08-29-2011
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#8 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: 90-92 vs 93-95 IHs
Oops. Sorry mis read Lee's post. Actually, Marc Haibeck usually does this conversion when he mods a 93-95 motor since the 90-92 IHs are more
available and they lend themselves to porting better than the later gen IHs. |
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08-29-2011
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#9 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: 90-92 vs 93-95 IHs
I have someone interested in ported IHs but they have a later car, so sounds like my IHs would be plug and play
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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08-29-2011
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#10 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: 90-92 vs 93-95 IHs
I guess on exchange that puts me in alittle bind as then I am stuck with older models and not many cars can use those...hmmmmm
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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