ANSWER TO THE INFAMOUS "1991 LX CAM BEING BETTER" | Ford Escort Owners Association (FEOA)

ANSWER TO THE INFAMOUS "1991 LX CAM BEING BETTER"

Discussion in '2nd Gen 1991-1996 1.9L SOHC' started by publikdstrbnce, Mar 27, 2005.

  1. publikdstrbnce

    publikdstrbnce Guest

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    The answer is yes, the cam out of a 91 lx is better than 92-96. How do i know???? If you happen to own a haynes manual look on page 2a-2. Listed under the 1.9l engine specs it is listed as following...

    CAMSHAFT(continued)
    Theoretical valve lift(measured at valve end of rocker arm)
    1991.........................................0.468 inch
    1992 and later............................0.405 inch


    The 2.0 SPI cam is 0.405

    This means im going to the scrap yard for a 1991 cam!!!! Happy hunting guys...

    The things that can happen from reading a haynes manual.



    *mod edit*
    for convience, instead of reading thru 14 pages of text...

  2. 4d_Me

    4d_Me New Member

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    cool, if only my lxe wasnt better
  3. ThumpinGT

    ThumpinGT New Member

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    ya ... your lxe comes with almost 30 more hp
  4. PonyExpress

    PonyExpress New Member

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    not 30 compared to a 91 1.9. .063" more lift is sick.. thats good for a phat increase in power.

    at least 8-10% more power over the "stock" cam profile.

    im going out to get my haynes right now.. i dont know if i saw that page in there..brb
  5. 4d_Me

    4d_Me New Member

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    so tell me how much more hp does a 91 lx have over a 92. i use to drive a 91 tracer
  6. PonyExpress

    PonyExpress New Member

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    ok, i did see this before.

    now.. look at the rocker arm ratio listed for all 1.9s, 1.65:1.

    now look at the lobe lift a couple lines above the valve lift:
    1991= .240"
    1992+= .245"

    now we look at that theoretical valve lift at the valve end of rocker arm:
    1991= .468"
    1992+= .405"

    what the crap..if we take out lobe lift multiplied times our rocker ratio of 1.65:1, we get a valve lift of .396". which is .002" higher lift than the old 1G CFI 1.9, which supposedly made 2 more hp.

    so.. what does this mean? it means that something is typed wrong somewhere.

    either the 91 1.9s had a different lobe lift than stated (.283"), or the 1991s had rocker arm ratios of 1.95:1, which is crazy high.

    thus lies the problem. we need to verify one or the other. I'd like to think that the lobe lift was higher than .240", if thats the case, then im putting my stock cam back in and throwing my Crane cam in the trash.

    if its the rocker arms, then my Crane cam gets its valve lift upped to .527"!!!!!

    which by the way, if i had over half an inch of valve lift, would explain my wicked lopey idle and messed up air/fuel ratios.
  7. 4d_Me

    4d_Me New Member

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    personaly, i think they just made the valves that much smaller, just to spite me
  8. PonyExpress

    PonyExpress New Member

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    thats where the 2hp comes in im sure.. the larger valves in the first gens, both CFI and GT.
  9. PonyExpress

    PonyExpress New Member

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    if i had to guess by the numbers, id say the added lift of the 91 cam over the 92+ would yield about 7-8hp, possibly more depending on mods done to the engine already.
  10. ThumpinGT

    ThumpinGT New Member

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    so 110 hp in a SOHC? Thats not too bad for slight modding. But then again fuel management rears its ugly head in your case. (maybe)
  11. PonyExpress

    PonyExpress New Member

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    id say the 91s have between 95-97 flywheel hp with this supposed cam profile, which is a nice increase.

    110 SOHC would be a stock 2.0 SPI.. toss in the 91 cam and BAM! 120hp easy.
  12. gospeedracer

    gospeedracer Guest

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    It would be awesome if someone could take a measurement...or find a Ford spec on the camshaft. I looked up a few different manufacturers (clevite, Sealed power) that offer OEM cams and they list ALL 91-96 cams as the same. Would be great to know if the book is wrong, or if they are correct, it may be hard to pass up looking for a 91 cam:)
  13. JohnScort

    JohnScort Guest

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    I'm going to a wreckers tommorow to get one and i'm going to try it in my SPI.

    John
  14. JohnScort

    JohnScort Guest

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  15. marclar

    marclar Moderator Staff Member

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    dam, maybe i should get one while the motor is out.
  16. Americanzer0

    Americanzer0 Guest

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    I'll go to the junk yard this week and rip the cam out of my old car which now lays there (RIP ol' 1991 white wagon...) It would not surprize me to see that the 1991 would have perhaps more power because my ol' wagn before I drove her into a lake, cracked the engine block, oil pan, and radiator, and then promptly drove her 75 miles home with no oil or coolant, was able to turn the tires over a little (good tires too!) while being relatively stock...
  17. PonyExpress

    PonyExpress New Member

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    im going to check the new print version of the Haynes, see if they re-printed the info the same way.

    id say they got the lobe lift wrong, otherwise they would have not only got the math wrong for the valve lift, but also typed "1991, and 1992 and newer" for no reason.

    why separate the years if theyre not different.

    the reason why the aftermarket stock cams are all teh same is because its SUPER cheaper to build one cam that works for all years rather than build 2 or 3.
  18. JohnScort

    JohnScort Guest

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    I checked my Haynes manuals and yes the 91 has a higher lift than the 92+ before we all go grab a 91 cam can someone pove how much extra gains it would be. Is it even worth the time and effort to swap it. If its like 2hp then screw it. but a lift like that seems good for about 8-10hp or so.

    John
  19. alxdgr8

    alxdgr8 New Member

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    Since i'm in the middle of my 1.9SPI project and my car is a 91, should i go ahead and swap the 91 cam into the SPI head. Seems like there's no downside since i have it sitting right in my garage and my engine is allready apart. I allready have the 2.0 head on the 1.9 block, you don't have to remove the head in order to change the cam correct. I just might do this tonight.
    Tx96Escort likes this.
  20. JohnScort

    JohnScort Guest

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    If the engine is out of the car NO..But if the engine is in the car I think you gotta take the head off because there ain't enough room to pull the cam out.

    My SPI needs a head gasket. So while i'm at that I might swap cams and maybe do some porting too.

    John

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