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Community Lounge, Introductions and General Discussion Discussion, Candid pictures of our cars. in General Discussion; Haha. I thought big blocks were able to rev higher than small blocks, is this incorrect?...
  1. #241
    V-Eight's Avatar
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    Re: Candid pictures of our cars.

    Haha. I thought big blocks were able to rev higher than small blocks, is this incorrect?

  2. #242
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    Re: Candid pictures of our cars.

    Wrong. Small blocks have less rotational mass so you can crank them up to 9k like they do in Nascar. However, the low redlines are also due to the way Americans build V8 engines. Most American V8s are more torque than horsepower, so they get all their power when running at low RPMs. My old '95 DeVille with the 4.9 used to cruise at 1800-2000 rpm at 65-70 mph, depending on wind and hills. However, most foreign cars will run between 2500-3500 at the same speed.

  3. #243
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    Re: Candid pictures of our cars.

    There are lots of ways to get Revs out of BB and SB.
    1/4 cars are real good at it. Take for example my LS1. I went from 6000 rpm to 7000 rpm with an upgraded valve train. I don't go over 6500 due to the bolts used for the bearing caps, I could upgrade those but it is not necessary at my power level.

    A bb block dosen't need to rev. I believe the stroke on my BB is 4 inches, good for torque. The Stroke on an LS1 is 3.9 inches. Stroke has some stuff do with it as well.
    My understanding is the longer the rod the less RPM, in some cases.

  4. #244
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    Re: Candid pictures of our cars.

    Quote Originally Posted by dirt_cheap_fleetwood View Post
    Wrong. Small blocks have less rotational mass so you can crank them up to 9k like they do in Nascar. However, the low redlines are also due to the way Americans build V8 engines. Most American V8s are more torque than horsepower, so they get all their power when running at low RPMs. My old '95 DeVille with the 4.9 used to cruise at 1800-2000 rpm at 65-70 mph, depending on wind and hills. However, most foreign cars will run between 2500-3500 at the same speed.
    Because their pushrod which can't handle the higher RPMS right?

    Quote Originally Posted by LS1Mike View Post
    There are lots of ways to get Revs out of BB and SB.
    1/4 cars are real good at it. Take for example my LS1. I went from 6000 rpm to 7000 rpm with an upgraded valve train. I don't go over 6500 due to the bolts used for the bearing caps, I could upgrade those but it is not necessary at my power level.

    A bb block dosen't need to rev. I believe the stroke on my BB is 4 inches, good for torque. The Stroke on an LS1 is 3.9 inches. Stroke has some stuff do with it as well.
    My understanding is the longer the rod the less RPM, in some cases.
    Yeah, I just heard somewhere that big-blocks could get up to 9k.....

    Probably just heavily modded. Also, how is redline determined, it it a certain % of the max?

  5. #245
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    Re: Candid pictures of our cars.

    Quote Originally Posted by V-Eight View Post
    Because their pushrod which can't handle the higher RPMS right?
    I believe Nascar still uses pushrod motors, but I am not sure. I know they still use carburetors. Like Mike said, its more how the engine is designed. Most big blocks are designed for torque, so they have a relatively short throw with larger bores and pistons. A shorter throw provides much more torque than a long throw. Its some weird physics thing I learned about in an engines class last year, but I forgot.

  6. #246
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    Re: Candid pictures of our cars.

    Quote Originally Posted by dirt_cheap_fleetwood View Post
    A shorter throw provides much more torque than a long throw.
    Youve got it switched. Longer stroke = more torque. Take the 4.5 and 4.9 for example. Both have the same bore but the 4.9 has a longer stroke which yeilds 30lb/ft more torque than the shorter stroked 4.5. A shorter stroke generally raises the engines redline also. F1 cars can reach 15,000rpm or higher due to an extremely short stroke. (2-3 inches)

  7. #247
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    Re: Candid pictures of our cars.

    Nascar still uses pushrod V8's with carbs. They are anything but antiquated though, teams spend millions of dollars in R&D looking for that one extra horsepower. I'd say Nascar along with the NHRA is on the leading edge of V8 technology. I like how the technology in those series is still relevant to the BBC/Hemi/LS1 under the hood of your muscle car, unlike Formula 1 V8's.

  8. #248
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    Re: Candid pictures of our cars.

    Quote Originally Posted by Sevillian273 View Post
    . A shorter stroke generally raises the engines redline also. F1 cars can reach 15,000rpm or higher due to an extremely short stroke. (2-3 inches)
    Do they just have a bigger bore then?

  9. #249
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    Re: Candid pictures of our cars.

    Pushrods can rev *ridiculously* high if you've got a good engine. The 302 in my dad's Z/28 was a pushrod, and it didn't even make max power until 8800rpm. The only reason they use DOHC engines in high-reving applications now is because they have less moving parts, which makes for a lesser probability of error at high rpms.

    Take this as an example: One time when my dad was driving he missed a shift and watched 9k fly past on the tach. He sent a pushrod straight up through the intake manifold and out the hood.

    Now with a DOHC engine, that wouldn't happen because there would be no pushrods to let fly. So I suppose that DOHC is a more reliable application for high-reving engines, but OHV can be just as good at the job, as we see in nascar.

  10. #250
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    Re: Candid pictures of our cars.

    Quote Originally Posted by Rodya234 View Post
    One time when my dad was driving he missed a shift and watched 9k fly past on the tach. He sent a pushrod straight up through the intake manifold and out the hood.
    F**kin Awesome!

  11. #251
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    Re: Candid pictures of our cars.

    I have always wanted to see an engine throw a rod through the block. I have seen one go through an oil pan, but its not as cool as going through the block.

  12. #252
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    Re: Candid pictures of our cars.

    Its not as cool as going thru the hood!

  13. #253
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    Re: Candid pictures of our cars.

    ^ That

  14. #254
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    Re: Candid pictures of our cars.

    Can you believe GM replaced all of the damaged parts under warranty too? Nowadays they'd never do that, they'd say you violated your warranty by abusing the car.

    They even knew that he was driving way above the redline (which was 7k) in order to get that to happen. The mechanic said that he must have hit 11,000 for it to fly like that

  15. #255
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    Re: Candid pictures of our cars.

    Quote Originally Posted by Rodya234 View Post
    Pushrods can rev *ridiculously* high if you've got a good engine. The 302 in my dad's Z/28 was a pushrod, and it didn't even make max power until 8800rpm.
    You're about 3000 rpm off.

    http://musclecars.howstuffworks.com/...camaro-z28.htm

    The 1969 Chevrolet Camaro Z28
    Specifications
    Wheelbase, inches: 108.1
    Weight, lbs: 3,765
    Number built: 20,302
    Base price: $3,185

    Top Available Engine
    Type: ohv V-8
    Displacement, cid: 302
    Fuel system: 2 x 4 bbl.
    Compression ratio: 11.0:1
    Horsepower @ rpm: 290 @ 5800
    Torque @ rpm: 290 @ 4200

    Representative Performance
    0-60 mph, sec: 7.4
    1/4 mile, sec @ mph: 15.12 @ 94.8
    "They call Alabama the Crimson Tide, call me Deacon Blues."

    Current:
    1992 Lincoln Town Car Cartier Edition (5/14- ?)
    2014 Honda Accord LX MTX Sedan (1/14 -?)

    Past:
    1995 Buick Roadmaster Limited (4/04-12/04)
    1992 Cadillac Sedan deVille (12/04-9/07)
    1999 Mercedes Benz S320 (8/07-7/09)
    2000 Buick Regal GS (7/09-4/12)
    2003 Mercury Marauder (4/12-10/13)
    1991 Buick LeSabre Custom Sedan (9/12-6/13)
    2013 Honda Accord LX Sedan (6/13-1/14)

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