Can you build a High Performace Engine that runs idles smooth? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-21-2004, 12:03 PM
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Can you build a High Performace Engine that runs idles smooth?

I was wondering if it's possible to build a sleeper motor that would have enough HP to do the job, but doesn't have the cam lope.

Regards
Mark

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Old 01-21-2004, 12:15 PM
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Yes, very good heads and mild camshaft....heads do the work so the cam can be very mild.

Chris
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Old 01-21-2004, 12:16 PM
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Thumbs up

Hydraulic roller cams can hide a lot of radical cam timing...
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Old 01-21-2004, 01:21 PM
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Ditto to the above responses and another route is to go with alot of cubes. Small cubes with big cams mean big loud exhaust. Big cubed engines don't need to rev as high which means you don't absolutely have to run headers and alot of compression to make power. Big cubed engines can purr like a kitten at idle but leap out of the gate like Sea Bisket when called upon. Just ask the 500 cube Caddi boys who are putting those engines in mid sized Cuttlasses and Montes! Can you say 13 second quarters on regular gas while you're listening to smooth jaz on the radio and runninng the air conditioner!
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Old 01-21-2004, 04:06 PM
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I would try a 383-406 with a set of AFR 195cc heads. Use a comp cams XR276HR cam with 1.6 rockers ( 224 230 @.050 .502 .510 lift) or the Magnum 280HR (224 224@.050 .525 lift). That motor with either of these cams would probably make its max hp around 5,500 rpm, but I would guess that it would make around 450-475 hp, and probably well over 500 ft bls.

Adam
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Old 01-21-2004, 07:37 PM
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So the Caddy motor sounds interesting. Do you have the dimensions of the caddy vs the dimensions of a 400 sbc?

Regards
Mark
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Old 01-21-2004, 08:08 PM
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Another thing is to open up the lsa. This will help the engine maintain better idle vacuum which will help idle quality.

Chris
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Old 01-21-2004, 08:14 PM
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Chris...I'm dumb...what's the Isa?

Jagdaddy...Ithe Caddy ebgine is basically the big block Rat.

Dave

By the way, Chris...that is some cute kiddo you've got!!! Must look like your wife
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Old 01-21-2004, 09:33 PM
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Mark, I once put a 500 Cad motor in a lowered 78 Chevy Truck. Gobs of torque.And fun to drive. 85 lbs.lighter than a bbc,alot smaller than a bbc, these work good but need a pretty beefy drivetrain. They like to eat 12 bolt axles!
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Old 01-21-2004, 11:57 PM
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No replacement for displacement.
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Old 01-22-2004, 12:52 AM
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My engine fits into that category:

Chevy 400, 11:1
World Products Sportsman II heads
234o @ .050", .488" lift (.520" effective with my 1.6 rockers), and a 114o lobe sep.

It idles extremely smooth, and gets 15 miles to the gallon.
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Old 01-22-2004, 01:35 AM
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Dig around in the Comp Cams catalog & they have some of their Extreme Energy series cams (both rollers & flat) with wider Lobe Separation Angles (112*-114*) for use with computers or for marine use (makes 'em idle smoother & get better vacuum & gas mileage). Crane has a couple in the catalog too, but mine's 6 years old. Probably got more by now. The Chevy LS1 qualifys for a sleeper motor in my book, & they use a top-notch head with a barely-over-200*-duration roller cam with LSA around 115*-116*. My old Nova has the GM 350hp 350 cam (224* duration & 114*LSA) & its idle is barely discernable from a stock-cammed 350. And if you have room for the big (20" case) Dynomax Turbo mufflers, they sound pretty sleepy until you hit the gas, & a pair of them will handle around 400hp without causing significant loss.
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Old 01-22-2004, 04:35 AM
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Quote:
Originally posted by bluesman123
Chris...I'm dumb...what's the Isa?

Jagdaddy...Ithe Caddy ebgine is basically the big block Rat.

Dave

By the way, Chris...that is some cute kiddo you've got!!! Must look like your wife
Lobe Separation Angle. It is the number of degrees between intake and exhaust full lift. By increasing this number you reduce the overlap of the intake and exhaust valve opening points. This overlap causes itake charge contamination and low cylinder pressures at idle and low RPM.

Thanks, I am pretty proud of my little guy. Everyone tells me he looks like me.......

Chris

Last edited by TurboS10; 01-22-2004 at 04:42 AM.
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Old 01-22-2004, 11:49 AM
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Sure a wider LSA will help, but don't get fooled into thinking that will smooth out the idle. I have a cam with a LSA of 114 and it rumbles big time. You would never guess it was on a LSA of 114. Wider LSA also give you a wider, smoother power band. They usually don't make as much peak power though. They are good for power adders (nitrous, turbo, supercharger). I chose this one because I wanted a wide power band (naturally aspirated).

Define what you call "high performance"? This will vary from person to person. If you want big torque down low and a smooth idle, put the biggest/largest engine you can in place. No headers and real quiet mufflers.

Royce
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Old 01-22-2004, 11:54 AM
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Very true Royce. It will not make alot of difference, but some. I also am running a wide lsa cam, but with over 250 @ .050 it still idles very rough at 1000-1200 RPM.

Chris
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