High rpm
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Joined: Apr 2008
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High rpm
Ok, I know the saying, " there is no replacement for displacement" but...................
Italian cars use multi-cylinder, small displacement engines that rev over 10grand. Why not put good parts in a L99 and rev the crap out of it????
Italian cars use multi-cylinder, small displacement engines that rev over 10grand. Why not put good parts in a L99 and rev the crap out of it????
Melting Slicks
Joined: Mar 2008
Posts: 3,022
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From: Chandler Arizona
L99- did i miss something? Did you mean L98? the biggest limitation(s)... pushrod technology doesn't like seriously high revs... the super exotics have relatively little stroke (compared to bore size and ultimate displacement), and the super exotics also have OHC's and valve timing controls. they also sport unique crankshafts...
Why do you need to rev so high after all? that's the beauty of big cubic inches and this "old school" pushrod technology. It's all about bottom-end TQ, and flat power bands.
Why do you need to rev so high after all? that's the beauty of big cubic inches and this "old school" pushrod technology. It's all about bottom-end TQ, and flat power bands.
Melting Slicks
Joined: Mar 2008
Posts: 3,022
Likes: 3
From: Chandler Arizona
every talked to someone that owns a ferrari or lamborghini or the like? oil changes require valvetrain adjustment as well! count me out. There is a reason why these cars have seriously low miles, and are rarely driven
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I dont know anyone who owns an exotic car but i own a gsxr 750 that redlines at 15k, that is what made me think of this. any other ideas? i like being unique and anything you run hard will need to be rebuilt more often.
Le Mans Master
Joined: Jul 1999
Posts: 8,683
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From: Phoenix AZ
I ride an R1 so I know what you mean. However, to build a street engine to run at high RPM, 8000 for example, takes a LOT more money than an engine built to rev at 6500 RPM. Can it be done? Definitely, the only limit is your wallet.
Melting Slicks
Joined: Sep 2008
Posts: 2,376
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From: Cherokee National Forest TN
The stock stroke is short enough for 8k given the correct bottom end components are used. As stated the problem is the valve train & more specifically the valve springs. They do not live long at 8K.
Since we are listing bikes in this thread: I ride a Busa.
Since we are listing bikes in this thread: I ride a Busa.
Safety Car
Joined: Apr 2001
Posts: 3,525
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From: Houston TX
Big power can be made at lower RPMs with added cubes. I run a 4" stroke crank, and running past ~6350 RPM seems like you are asking for issues. Best components, Oliver Billets, Crower Superlite, JE custom, Jesel shafts, but still don't like really high RPM. Also, boost (25+ psi) makes up for any shortcomings in RPM. 
Gix1000 and ZX7R.
Gix1000 and ZX7R.
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From: Rolla Missouri
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None of those high RPM engines your talking about are using good old fashioned pushrod technology either.
I know NASCAR does it, with their cars often going over 9K rpm.
But just one of those engines cost more than a back yard full of C4's. Plus the fact they only have to live for a max of 500 miles.
My Harley uses the old fashioned pushrods to activate the rocker arms and valves, and it won't turn high rpm either.
But I wasn't looking for a high revving engine.
If you want to turn 10k or higher on a regular basis, your going to have to use an overhead cam motor.
I know NASCAR does it, with their cars often going over 9K rpm.
But just one of those engines cost more than a back yard full of C4's. Plus the fact they only have to live for a max of 500 miles.
My Harley uses the old fashioned pushrods to activate the rocker arms and valves, and it won't turn high rpm either.
But I wasn't looking for a high revving engine.
If you want to turn 10k or higher on a regular basis, your going to have to use an overhead cam motor.
Race Director
Joined: Jan 2002
Posts: 12,261
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From: O'Fallon Missouri
L99 is the baby LT1.
1996 Caprice/Impala SS - Engines (L99)
4.3 Liter SFI V8 Engine (L99)
A 4.3 Liter small block V8 is the standard engine for the 1996 Chevrolet Caprice Classic Sedan. The L99 incorporates the Corvette LT1's advanced technology in a smaller 4.3 Liter displacement engine. It produces 200 horsepower at 5000 rpm and 240 lb.-ft. torque at 2400 rpm. OBD II ( On-Board Diagnostics Second Generation) is standard.
The 4.3L V8 features a cast-iron block, for durability and reliability
The cast-iron cylinder heads were designed for a Sequential Fuel Injection intake manifold and reverse flow cooling system, providing maximum power without sacrificing efficiency
An air cleaner silencing system and induction tuning provide extremely quiet operation
A new electric air injection reactor (AIR) pump reduces hydrocarbon emissions on cold starts without the parasitic power loss and noise associated with a mechanical air pump
The L99 shares many technical features with the 5.7 Liter LT1 engine described below.
1996 Caprice/Impala SS - Engines (L99)
4.3 Liter SFI V8 Engine (L99)
A 4.3 Liter small block V8 is the standard engine for the 1996 Chevrolet Caprice Classic Sedan. The L99 incorporates the Corvette LT1's advanced technology in a smaller 4.3 Liter displacement engine. It produces 200 horsepower at 5000 rpm and 240 lb.-ft. torque at 2400 rpm. OBD II ( On-Board Diagnostics Second Generation) is standard.
The 4.3L V8 features a cast-iron block, for durability and reliability
The cast-iron cylinder heads were designed for a Sequential Fuel Injection intake manifold and reverse flow cooling system, providing maximum power without sacrificing efficiency
An air cleaner silencing system and induction tuning provide extremely quiet operation
A new electric air injection reactor (AIR) pump reduces hydrocarbon emissions on cold starts without the parasitic power loss and noise associated with a mechanical air pump
The L99 shares many technical features with the 5.7 Liter LT1 engine described below.
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
A 4.3 Liter small block V8 is the standard engine for the 1996 Chevrolet Caprice Classic Sedan. The L99 incorporates the Corvette LT1's advanced technology in a smaller 4.3 Liter displacement engine. It produces 200 horsepower at 5000 rpm and 240 lb.-ft. torque at 2400 rpm. OBD II ( On-Board Diagnostics Second Generation) is standard.
Thread Starter
Advanced
Joined: Apr 2008
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None of those high RPM engines your talking about are using good old fashioned pushrod technology either.
I know NASCAR does it, with their cars often going over 9K rpm.
But just one of those engines cost more than a back yard full of C4's. Plus the fact they only have to live for a max of 500 miles.
My Harley uses the old fashioned pushrods to activate the rocker arms and valves, and it won't turn high rpm either.
But I wasn't looking for a high revving engine.
If you want to turn 10k or higher on a regular basis, your going to have to use an overhead cam motor.
I know NASCAR does it, with their cars often going over 9K rpm.
But just one of those engines cost more than a back yard full of C4's. Plus the fact they only have to live for a max of 500 miles.
My Harley uses the old fashioned pushrods to activate the rocker arms and valves, and it won't turn high rpm either.
But I wasn't looking for a high revving engine.
If you want to turn 10k or higher on a regular basis, your going to have to use an overhead cam motor.
I agree. I guess I wasnt thinking about the valve train. Thanks.