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09-08-2011, 02:45 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Quote:
Originally Posted by AL427SBF
Thanks guys ...
Matt, nice numbers so must be a solid build with a great VE.
blykins, looking for 400+ at the rear wheel in a reliable "no fuss" motor. It's already built and I will dyno when car & motor are delivered. I'm pretty sure I'll get 400+ RWHP, I was just curious on what SBF owners typically were getting.
Dwight, also very nice numbers for a 354 and VE near 1 I'm sure.
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What's your engine Al? Always exciting to get a new toy....
Most engines will be over 100% VE these days.... |
09-08-2011, 04:30 AM
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CC Member
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Join Date: Apr 2011
Posts: 1,092
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Not Ranked
Yes, it's an aluminum DART 351W/427 block "naturally aspirated" as they say. Brett's 427 S/B Cobra Motor 2011
Bearing clearances are tight @ <.0025 so I'm hoping for a VE around 100%. I'll probably re-do that air cleaner cover, didn't come out quite as expected, a tad too loud when all is said and done lol.
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09-08-2011, 04:35 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
For a street engine, the bearing clearances are spot on. I usually shoot for between .002-.0025". You have to remember that the Dart blocks use Cleveland main sizes (2.750") and the cranks use SBC rod journals (2.100"). Very small compared to the standard 3.000" main sizes and 2.311" journal sizes of a factory 351W.
Volumetric efficiency mainly has to do with how much air can be shoved into the cylinders. With a modern head/cam package, 100% is certainly achievable.
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09-08-2011, 04:38 AM
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Senior Club Cobra Member
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Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
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Not Ranked
Quote:
Originally Posted by AL427SBF
Yes, it's an aluminum DART 351W/427 block "naturally aspirated" as they say. Brett's 427 S/B Cobra Motor 2011
Bearing clearances are tight @ <.0025 so I'm hoping for a VE around 100%. I'll probably re-do that air cleaner cover, didn't come out quite as expected, a tad too loud when all is said and done lol.
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You may want to change out your crankshaft pulley,you have underdrive pulleys on it now and may have overheating issues.....For a street car, your crank pulley should be at least the same diameter as your water pump pulley,if not slightly larger.........
BTW: looks like a really nice package you have there..........
David
__________________
DAVID GAGNARD
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09-08-2011, 05:35 AM
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CC Member
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Join Date: Apr 2011
Posts: 1,092
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Not Ranked
blykins, when talking to the guys at Joe Gibbs on oil recommendations they thought maybe the larger journals could be used depending on the 351W block ordered. My block wasn't cheap by any stretch PN 31345235. DART says in their description "Two main bearing diameters of 2.249 in. or 2.749 in. allow choice of small or large journal crankshaft." I've checked the BOM and can't find anything that gives away what configuration I have - what part/part number would give me that info? - yes, I'm a rookie at this stuff.
Dave, the motor has been run in and no heat issues - actually runs on the cool side at 175F in the engine stand.
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09-08-2011, 05:40 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
The 302 based block would be the 2.249" size. The 351W based block (which is what you have) would be the 2.750" size.
Unless it's a flat tappet cam, I wouldn't worry about special oils. I use Shell Rotella in all of my roller cam engines.
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09-08-2011, 06:01 AM
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CC Member
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Join Date: May 2011
Cobra Make, Engine:
Posts: 38
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Not Ranked
351/392 single turbo
Sportman block
60 lb injectors / Electromotive Fuel Management
543 rwhp @ 5250 (7lbs boost.)
650 rwtq @ 3100 RPM
Great "street car" Drove from Huntsville to LCS 2 years ago in it and avg'd 24 MPG!
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11-21-2011, 06:40 PM
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CC Member
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Join Date: Oct 2002
Location: CONOVER,
NC
Cobra Make, Engine: Factory 5
Posts: 110
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Not Ranked
This is the writeup of my engine that came with the car.
It is a built 302 bored .020 over and makes a dyno tested 331hp at 5900 rpm and 324ft./lb. of torque at 4500 rpm. The machined block is equipped with a balanced rotating assembly complete with SRP forged flat top pistons and shot peened connecting rods. Next, a Comp Cams XE274HR camshaft and Air Flow Research 185cc aluminum heads with Comp Cams roller rockers were bolted up. Then an Edelbrock Performer RPM intake topped with a Holley Street Avenger carburetor finished things off. An MSD ignition system complete with both an MSD distributor and MSD coil provides the spark.
__________________
The trouble with retirement is that I never get a day off!
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12-26-2011, 03:43 PM
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CC Member
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Join Date: Apr 2010
Location: Severna Park,
MD
Cobra Make, Engine: Ford 289
Posts: 50
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Not Ranked
My engine numbers
Displacement: 333 (331 w/.040 bore)
Block Type: 5 bolt 289
Compression Ratio: 10.6
Caburetor Size/EFI: 680 Holly XE
Peak Crank HP @ RPM: 392 @ 5900
Peak Torque @ RPM: 401 @ 4200
Other "trick" parts:
custom cam, TW 170 heads, TRY-Ys, Eddy performer RPM, custom curved distributor, 2.5" exhausts, Jacobs ignition.
My numbers are RWHP and RWTQ based on chassis Dyno results. This build makes 17" of vac and is very happy, idling at 900 Rs.
Merry Christmas all!
__________________
Ken
Severna Park, Md
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