So I cammed this little 427. . .
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So I cammed this little 427. . .

  1. #1
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    Default So I cammed this little 427. . .

    that finally went to the track. The dyno sheet is to large to load but would like some guesses as to what this car should run based on the numbers.

    HP Tq
    356 519 3600
    399 538 3900
    444 555 4200
    493 575 4500
    522 572 4800
    551 567 5100
    573 557 5400
    592 545 5700
    622 545 6000
    632 527 6300

    Peak HP 633 @ 6400 Peak torque was at 4600 577#/ft

    Now I will tell you the customer was hoping to run mid 11's with this, that was his power goal. He got flack from some people over the torque of this engine and the numbers not being "real". I did the cam only, customer built the engine, and he found a shop to dyno the engine. I did not know the shop.

    So whether you feel the numbers are legit or the numbers are inflated what should the car run?

    Also if anyone can manipulate a pdf file to resize it I will send it to you and have you post it on this thread.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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    Living in a cage of fear thatguy's Avatar
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    What kind of car?

    My 71' Nova went 11.23 @ 124 mph best with 450 HP.
    383 SB long rod stroker with 12:1 and .530 lift solid.
    turbo 350 and a 10 bolt posi w/ 5.13 gears.
    spun up to like 7200 though.

    That was a long time ago, so the numbers may be slightly off.
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    Sorry I thought I posted it.

    1966 Chevelle
    Street Tires
    3800#
    M-22 tranny
    I think it's got 4.30's in it... now confirmed with a 28" tall tire.
    Last edited by cstraub; 11-03-2009 at 08:44 AM. Reason: Confirm gear ratio..
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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    Quote Originally Posted by cstraub View Post
    Sorry I thought I posted it.

    1966 Chevelle
    Street Tires
    3800#
    M-22 tranny
    I think it's got 4.10's in it... I'll confirm.
    low 12's

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    Senior Member ap67et10's Avatar
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    can he drive it? i'd say the manual trans and the driver are the biggest limiting factors. the power and setup should be able to touch 11's.

    AP

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    Spiral out MikeF's Avatar
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    What heads?

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    cfm
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    Quote Originally Posted by cstraub View Post

    So whether you feel the numbers are legit or the numbers are inflated what should the car run?
    You don't know if the dyno info is correct and you don't know the rear gear, slicks, suspension and such. So, how are we supposed to even remotely guess guess ?

    Well, if the dyno is correct and assume the 4:10 gear, then I'll make a guess of low 10's, again assuming it does not have any killer suspension in it, but having a decent form of suspension in it.

    Then again, the rpm you show does not really go high enough to run this fast. The highest rpm you showed us was the peak hp rpm. What where the numbers past peak ? This is very important to drag racing as we will shift past peak and go thru the lights past peak hp rpm.

    If the motors falls on it's face after peak hp then it will be a turd, no matter how big the #'s are before it.

    Anyhow - with the data present this whole guess the ET thing is major conjecture.
    Last edited by cfm; 11-02-2009 at 03:23 PM.

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    Senior Member snoopjonnyjon's Avatar
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    Heavy car with street tires (I am assuming a real street tire, not a barely street legal cheater slick)... mid 11's sounds reasonable because he'll have to idle out of the hole. Should be a really fun tire scorcher around town! But I am coming from a track where everyone runs slower than they think they should. Bad air up here usually.

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    cfm
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    Quote Originally Posted by ap67et10 View Post
    can he drive it? i'd say the manual trans and the driver are the biggest limiting factors. the power and setup should be able to touch 11's.

    AP
    410HP 355 (had those stinky aluminum Corvette heads) in a 3700 Camaro with M22 and 10.5 M&H's ran 11.96 at 110mph.
    No suspension tweaking. We are at a few hundred feet above sea level.

    Here's the car.
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    Compression Ratio?

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    If it's got street tires11.20-11.30 @ 122-126.

    Slicks should do 10.70-10.80 @ 125-128.

    IF he knows how to drive a 4 speed car. Let me know how close I get.

    RR

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    Boat Nut sleekcrafter's Avatar
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    Quote Originally Posted by cfm View Post
    You don't know if the dyno info is correct and you don't know the rear gear, slicks, suspension and such. So, how are we supposed to even remotely guess guess ?

    Well, if the dyno is correct and assume the 4:10 gear, then I'll make a guess of low 10's, again assuming it does not have any killer suspension in it, but having a decent form of suspension in it.

    Then again, the rpm you show does not really go high enough to run this fast. The highest rpm you showed us was the peak hp rpm. What where the numbers past peak ? This is very important to drag racing as we will shift past peak and go thru the lights past peak hp rpm.

    If the motors falls on it's face after peak hp then it will be a turd, no matter how big the #'s are before it.

    Anyhow - with the data present this whole guess the ET thing is major conjecture.

    The guys on PASS TIME seem to get it pretty close, with in a few tenths.
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    cfm
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    Quote Originally Posted by sleekcrafter View Post
    The guys on PASS TIME seem to get it pretty close, with in a few tenths.
    Haven't seen it. I'm guessing they see the car ?

    "Street tires" can range the gammut from 265/70/15 BFG radials (normal) to Nitto 315/35/17's, to a 10.5" M&H or ET Street.

    Anyhow, I'm saying that there is no way to guess because he mentioned he does not know if the dyno sheet is correct or not, does not know the rear gear, and has not mentioned the tire.

    The more data that is given, the closer the 'guesses' will be to real life.

    Only hard data I see here is the year, make, model, weight, and transmission.

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    Senior Member ap67et10's Avatar
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    Quote Originally Posted by cfm View Post
    410HP 355 (had those stinky aluminum Corvette heads) in a 3700 Camaro with M22 and 10.5 M&H's ran 11.96 at 110mph.
    No suspension tweaking. We are at a few hundred feet above sea level.

    Here's the car.
    i was assuming this is totally street trim, which means the biggest your gonna get under a 66 chevelle are 275's and even with a drag radial this thing will never hook up with the stock coil spring, triangulated 4 link they have, especially if they are stock type trailing arms and springs. this is way too much power to keep anything on the ground and to get this big old thing moving, and then adding in the factors of a clutch and 4 gears, i just don't see much more than mid 11s simply because of all the factors envolved. i bet if you put some slicks on it, do a little suspension work to it, and get someone that can really drive the thing. i would not be suprised to see it well into the 10's it has plenty of power to do it, but in street trim, its just going to be too hard to hook the thing with that much power....but maybe i'm wrong.

    AP

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