to big of a cam to little stall.. how will it act?

Discussion in 'Engine Topic' started by 1981coupe400ci, Nov 12, 2005.

  1. 1981coupe400ci

    1981coupe400ci Veteran Member

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    if a cam is to big for the stall... will the engine try to stall out while its in gear and the car is stopped???

    my little brother put in a performer RPM cam in a stock 8.5-1 C/R 350 engine, put on an aftermarket intake and headers....
    the engine trys to stall while its in gear(th350)

    (performer RPM specs)-adv. dur. int.308 exh.318 .......dur.@.050 int.234 exh.244 ......lift int. .488 exh. .510



    he's been just putting it in neutral when he stops then putting it in gear when he needs to move again(rebuilt trans aint gonna last long like that.. he wont listen to me though)

    i'm almost positive the cam is just to big for a stock engine

    he thinks by changing the stall its gonna fix the problem

    i know it might make it better but still the cam is still to big for the engine


    of corse he wont listen to me

    i told him something similar to maybe a XE268 or 272 or an oldschool 300HP cam would work good...


    can anyone recomend what to do so i can print it off and show him...

    he doesnt trust me (even though i've done several cam swaps and have never had the problem he has right now)

    help...
     
  2. 1978LT

    1978LT Veteran Member

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    That cam really needs a 3000-3500 stall, IMO :D
     
  3. cody

    cody Veteran Member

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    maybe PDQ will chime in b/c he seems to be really good at reading advertised dusration #'s(knowing what comp. it needs etc)

    i bet that thing hardly gets out of its own way,especially without a stall...it has to be really soggy down low.id either take the comp up to 10.1 or so and add a stall like 1978LT suggested,or go down in cam size..heres and example,i learned the hard way.....

    my 327
    (around 9.0:1 comp or so,255/266 @.50,.540,.558 105 LSA)
    with a 4000 stall,4.10s,and a 26" tire,i could never get better then a 9.0 1/8 mile,with a 2.0 60 ft. dead hooking..

    same motor,rethought combo,bumped the compression up to 9.7:1,went to a much smaller 230/230 .480/.480(same one you have in your 327..see,you know how to pick a cam:)

    ive ran 8.1s in the 1/8 and spinning low 1.8 60 fts..im positive its got a 7.xx when i get back to the track..

    basically,and overcammed motor is definately no fun,especially when one sounds so bad ass idling thne pulls away like a turd
     
  4. cody

    cody Veteran Member

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    BTW mine wouldnt idle in gear either with the 255/266 solid i had in it,even with my 4000 stall....idles great in gear now though
     
  5. 1981coupe400ci

    1981coupe400ci Veteran Member

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    it actually hauls ass but wont idle for crap....

    i'll print these off and show him...


    thanks!
     
  6. 1978LT

    1978LT Veteran Member

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    Since Edelbrock's RPM kit uses 9.0-9.5 compression, has he ever thought of milling the heads or changing them? It would go a long way in helping low end response and may help it idle better even more :D
     
  7. Mwilson

    Mwilson Veteran Member

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    He should be able to work some bugs out and get it to idle, timing or carb, I ran a comp 292 in a 9.x:1 comp. motor with a stock stall, it'll def. be faster with the higher stall but I dont think the Idle problem is related to the stall.
     
  8. NEONGREEN406

    NEONGREEN406 Veteran Member

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    My cam size 488-510 i run a 3.73 gear and a 3200-3500 stall my best time was a 7.9 in the 1/8 mile.Did a lot of suspension work,and run street MT slicks.:cool:
     
  9. Gary S

    Gary S Administrator Lifetime Gold Member

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    Long duration cams and automatic trannys don't work well together. There is a good reason that Chevy offered their top engines with manual trannys only. Raising the stall of the torque converter will help let the engine idle higher where it needs to be with the longer duration cam.
     
  10. rustbucket79

    rustbucket79 Veteran Member

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    A neat trick you can try before the dreaded cam swap is to build a limiting plate for the mechanical advance to about 10 degrees at the crank, then dial in about 20 to 25 initial. Starting shouldn't be an issue, and it will want to idle. Cam is definately too large, remove at least 20 degrees off of each .050" number for best results.
     

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